PMID(sorted ascending)
[gasometric determination of carbon dioxide in carbano-apatites of calcified tissue].the determination of carbon dioxide in carbonato-apatites is carried out a new gasometric method. its application, in this paper, concerns the bones of skull and mandibles of cory's shearwater (calonectris diomedea borealis) and mallard (anas platyrhynchos). the results lead to appreciable differences between some organs of this two species.19911781603
relationships between heavy metal and metallothionein concentrations in lesser black-backed gulls, larus fuscus, and cory's shearwater, calonectris diomedea.metallothionein, cadmium, zinc, copper, and mercury concentrations were measured in adult lesser black-backed gulls, larus fuscus; and metallothionein, cadmium, zinc, and copper concentrations were measured in fledgling cory's shearwaters, calonectris diomedea. in gulls, metallothionein was positively correlated with cadmium (kidney r = 0.83, liver r = 0.46), zinc (kidney r = 0.46, liver r = 0.37), and copper (kidney r = 0.28, liver r = 0.34). mercury levels in lesser black-backed gulls showed n ...19968854964
heavy metal concentrations in cory's shearwater, calonectris diomedea, fledglings from the azores, portugal. 19978952934
the homing behaviour of cory's shearwaters (calonectris diomedea) studied by means of a direction recordera direction recorder, which can be carried by a flying bird on its back, has been used for the first time on a wild species. the device can detect and record the direction in which a bird is heading during flight. cory's shearwaters (calonectris diomedea) were moved from their nesting colony to five different sites and fitted with direction recorders, and four homing flight paths were obtained. our data show that the displaced birds were able to assume and maintain a homeward course soon after r ...19959317959
flexible foraging strategy of cory's shearwater, calonectris diomedea, during the chick-rearing period.procellariiformes are well known for their low rates of food provisioning to their slow-growing chicks. in some species, the patterns of food delivery to chicks have been deduced from changes in their weight, obtained from periodic weighings. however, the behaviour of individual parents cannot be resolved using this method. in this study, we used a periodic weighing protocol with cory's shearwater chicks on selvagem grande island, in the northeast atlantic. in addition, we used an automatic logg ...19989819333
food provisioning to nestling shearwaters: why parental behaviour should be monitored?we examined temporal variation in food delivery to nestling cory's shearwaters calonectris diomedea, by repeated periodic weighings during the night. we tested whether the magnitude and frequency of meals were influenced by the condition of chicks. in contrast to previous studies of chick provisioning in petrels and shearwaters, the evidence of feeding derived from chick weight gains was complemented by data provided by an electronic system, which logged the entry of each parent to the nest. est ...199910196057
features of dna fragments obtained by random amplified polymorphic dna (rapd) assaysrandom amplified polymorphic dna (rapd) fragments were prepared from samples of calonectris diomedea (cory's shearwater, aves) and haemonchus contortus (nematoda) dna by polymerase chain reaction (pcr) using decamers containing two restriction enzyme sites as primers. six of 19 studied rapd fragments probably originated from traces of commensal microorganisms. many rearranged fragments, absent in the original genomic dna, were synthesized and amplified during the processing of all the dna sample ...199910199010
the attendance cycles of the cory's shearwater calonectris diomedea borealis on selvagem the cory's shearwater calonectris diomedea borealis of selvagem grande (30 degrees 09'n, 15 degrees 52'w), the visits the birds pay to their colonies are cyclic throughout the breeding period. the number of visitors varies regularly between a minimum and a maximum following a sinusoid, the half-period of which is 4.8 +/- 1.5 d (2-8 d). no variation exists according to the status of the birds (breeders or non-breeders) or to the stage of the breeding cycle (pre-egg, incubation or chick rearing ...200010803350
kinetics, dose--response, and excretion of methylmercury in free-living adult cory's shearwaters.we evaluated methylmercury (mhg) kinetics, dose--responses, and excretion in free-living adult cory's shearwaters using a nondestructive multi-tissue approach. elimination of mhg in blood comprised an initial fast phase, with half-time of 1 d, and a slow terminal phase with half-time between 44 and 65 d. molt was a crucial factor in determining the rate of mhg elimination. half-times were independent of dose. a relationship between steady-state blood concentrations and dietary intake of mhg was ...200111349286
kinetics, dose-response, excretion, and toxicity of methylmercury in free-living cory's shearwater chicks.methylmercury (mhg) kinetics, dose-response, excretion, and toxicity were experimentally evaluated and compared between small (one to two weeks old) and large (six to seven weeks old), free-living cory's shearwater chicks. the half-time for the terminal elimination phase of mhg in blood (5.7 d) and the average percentage of ingested mhg deposited in the blood volume (12%) were independent of the age at exposure. therefore, these data were employed to derive a relationship between steady-state bl ...200111491567
phylogeography of the calonectris shearwaters using molecular and morphometric data.we investigated phylogenetic relationships and the biogeographic history of the calonectris species complex, using both molecular and biometric data from one population of the cape verde shearwater calonectris edwardsii (cape verde islands), one from the streaked shearwater c. leucomelas (western pacific ocean) and 26 from cory's shearwater populations distributed across the atlantic (c. d. borealis) and the mediterranean (c. d. diomedea). the streaked shearwater appeared as the most basal and d ...200616814569
experimental increase of flying costs in a pelagic seabird: effects on foraging strategies, nutritional state and chick condition.a central point in life history theory is that parental investment in current reproduction should be balanced by the costs in terms of residual reproductive value. long-lived seabirds are considered fixed investors, that is, parents fix a specific level of investment in their current reproduction independent to the breeding requirements. we tested this hypothesis analysing the consequences of an experimental increase in flying costs on the foraging ecology, body condition and chick condition in ...200717124570
yelkouan shearwater nest-cavity selection and breeding success.we describe, for the first time, nest-cavities selected by the mediterranean endemic yelkouan shearwater puffinus yelkouan on french islands, comparing it with the sympatric cory's shearwater calonectris diomedea. by monitoring 179 suitable cavities during four years, we show that yelkouan shearwaters select deeper cavities and with more winding tunnels than those selected by cory's shearwaters or unoccupied cavities. logistic regression modelling indicates that cavities with nest-like character ...200717434114
geographic assignment of seabirds to their origin: combining morphologic, genetic, and biogeochemical analyses.longline fisheries, oil spills, and offshore wind farms are some of the major threats increasing seabird mortality at sea, but the impact of these threats on specific populations has been difficult to determine so far. we tested the use of molecular markers, morphometric measures, and stable isotope (delta15n and delta13c) and trace element concentrations in the first primary feather (grown at the end of the breeding period) to assign the geographic origin of calonectris shearwaters. overall, we ...200717708223
the end of cory's shearwater. 191517807517
ocean surface winds drive dynamics of transoceanic aerial wind patterns influence dispersal and migration processes of aerial organisms, propagules and particles, which ultimately could determine the dynamics of colonizations, invasions or spread of pathogens. however, studying how wind-mediated movements actually happen has been hampered so far by the lack of high resolution global wind data as well as the impossibility to track aerial movements. using concurrent data on winds and actual pathways of a tracked seabird, here we show that oceanic ...200818698354
plastic ingestion by procellariiformes in southern brazil.the procellariiformes are the birds most affected by plastic pollution. plastic fragments and pellets were the most frequent items found in the digestive tract of eight species of procellariiformes incidentally caught by longline fisheries as well as beached birds in southern brazil. plastic objects were found in 62% of the petrels and 12% of the albatrosses. the great shearwater, manx shearwater, cory's shearwater and antarctic fulmar were found to have greater quantities and frequencies of occ ...200918840384
sexual dimorphism in bill morphology and feeding ecology in cory's shearwater (calonectris diomedea).the bill is a sexually dimorphic structure in many bird species and implicated in numerous functions. sexual differences may arise from sexual selection or ecological divergence. here, we examined differences in bill size and shape between males and females and explored to what extent these relate to feeding ecology of each sex in cory's shearwater (calonectris diomedea). we applied linear measurements and geometric morphometric methods to examine sexual differences in bill size and shape. we in ...200918950998
linking isotopic and migratory patterns in a pelagic seabird.the value of stable isotope analysis in tracking animal migrations in marine environments is poorly understood, mainly due to insufficient knowledge of isotopic integration into animal tissues within distinct water masses. we investigated isotopic and moult patterns in cory's shearwaters to assess the integration of different stable isotopes into feathers in relation to the birds' transoceanic movements. specimens of mediterranean cory's shearwater calonectris diomedea diomedea caught accidental ...200919194727
buying years to extinction: is compensatory mitigation for marine bycatch a sufficient conservation measure for long-lived seabirds?along the lines of the 'polluter pays principle', it has recently been proposed that the local long-line fishing industry should fund eradication of terrestrial predators at seabird breeding colonies, as a compensatory measure for the bycatch caused by the fishing activity. the measure is economically sound, but a quantitative and reliable test of its biological efficacy has never been conducted. here, we investigated the demographic consequences of predator eradication for cory's shearwater cal ...200919279685
foraging segregation between two closely related shearwaters breeding in sympatry.trophic segregation has been proposed as a major mechanism explaining the coexistence of closely related animal taxa. however, how such segregation varies throughout the annual cycle is poorly understood. here, we examined the feeding ecology of the two subspecies of cory's shearwater, calonectris diomedea diomedea and calonectris diomedea borealis, breeding in sympatry in a mediterranean colony. to study trophic segregation at different stages, we combined the analysis of isotope values (delta( ...200919364709
flight dynamics of cory's shearwater foraging in a coastal environment.flight dynamics theories are influenced by two major topics: how birds adapt their flight to cope with heterogeneous habitats, and whether birds plan to use the wind field or simply experience it. the aim of this study was to understand the flight dynamics of free-flying cory's shearwaters in relation to the wind characteristics on the coastal upwelling region of continental portugal. we deployed recently miniaturised devices-global positioning system loggers to collect precise and detailed info ...201020060697
breaking the routine: individual cory's shearwaters shift winter destinations between hemispheres and across ocean basins.there is growing evidence that migratory species are particularly vulnerable to rapid environmental changes arising from human activity. species are expected to vary in their capacity to respond to these changes: long-distance migrants and those lacking variability in migratory traits are probably at considerable disadvantage. the few studies that have assessed the degree of plasticity in behaviour of marine animals suggest that fidelity to non-breeding destinations is usually high. in the prese ...201021106591
successful eradication of the european rabbit (oryctolagus cuniculus) and house mouse (mus musculus) from the island of selvagem grande (macaronesian archipelago), in the eastern atlantic.the portuguese island of selvagem grande (great salvage) in macaronesia is an important seabird breeding station in the eastern atlantic. significant populations of cory's shearwater calonectris diomedea (scopoli, 1769), bulwer's petrel bulweria bulweria (jardine & selby, 1828) and little shearwater puffinus assimilis baroli (bonaparte, 1857) are present, and white-faced storm-petrel pelagodroma marina (latham, 1790) and madeiran storm-petrel oceanodroma castro (harcourt, 1851) populations are o ...201021392324
studying the reproductive skipping behavior in long-lived birds by adding nest inspection to individual-based data.the frequency at which individuals breed is an important parameter in population, as well as in evolutionary, studies. however, when nonbreeding individuals are absent from the study area, the reproductive skipping is usually confounded with a recapture failure and cannot be estimated directly. yet, there are situations in which external information may help to estimate reproductive skipping. such a situation is found with nest-tenacious birds: the fact that an individual is not encountered in i ...201121563585
eleven polymorphic microsatellite markers in cory's shearwater, calonectris diomedea, and cross-species amplification on threatened procellariiformes.for the first time, we describe 11 variable dinucleotide microsatellites and the conditions for multiplexing and simultaneous genotyping sets of loci in cory's shearwater, calonectris diomedea. microsatellite variability was assessed in a colony from the azores archipelago (atlantic ocean). two to eight alleles were detected per locus, the mean gene diversity being 4.5. cross-species amplification in three other seabirds (diomedea exulans, procellaria aequinoctialis and bulweria bulwerii) reveal ...200821585845
feather corticosterone of a nestling seabird reveals consequences of sex-specific parental investment.offspring of long-lived species should face costs of parental trade-offs that vary with overall energetic demands encountered by parents during breeding. if sex differences exist in how parents make the trade-off, sex-specific differences may exist in the contribution of each parent to those costs. adaptations of offspring facing such costs are not well understood, but the hormone corticosterone probably plays a role. we manipulated breeding effort in cory's shearwaters (calonectris diomedea) to ...201221632628
different means to the same end: long-distance migrant seabirds from two colonies differ in behaviour, despite common wintering grounds.although seabirds that are trans-equatorial migrants show apparently broad overlap among populations in the non-breeding season, such large-scale pattern may conceal subtle but nevertheless key differences in migratory behaviour. these specializations could reflect adaptation to different environments during the breeding season, carry-over effects from the breeding to the nonbreeding period, or asymmetries in competitive ability of birds of different origin. we compared the migratory and winteri ...201122022513
high prevalence of parental delivery of plastic debris in cory's shearwaters (calonectris diomedea).plastic ingestion by adult procellariiformes has been widely recorded, but few studies have evaluated intergenerational transfer. we assessed the prevalence of plastic particles, as well as their basic characteristics, in the gut content of dead cory's shearwater fledglings stranded by light pollution on canary islands. eighty-three percent of birds were affected, containing on average 8.0 plastic pieces per bird. the average plastic weight per bird was low (2.97±3.97mg) compared with other petr ...201222784377
combined spatio-temporal impacts of climate and longline fisheries on the survival of a trans-equatorial marine migrant.predicting the impact of human activities and their derivable consequences, such as global warming or direct wildlife mortality, is increasingly relevant in our changing world. due to their particular life history traits, long-lived migrants are amongst the most endangered and sensitive group of animals to these harming effects. our ability to identify and quantify such anthropogenic threats in both breeding and wintering grounds is, therefore, of key importance in the field of conservation biol ...201222815833
contrasting effects of climatic variability on the demography of a trans-equatorial migratory seabird.large-scale seasonal climatic indices, such as the north atlantic oscillation (nao) index or the southern oscillation index (soi), account for major variations in weather and climate around the world and may influence population dynamics in many organisms. however, assessing the extent of climate impacts on species and their life-history traits requires reliable quantitative statistical approaches. we used a new analytical tool in mark-recapture, the multi-event modelling, to simultaneously asse ...201322823099
do seabirds differ from other migrants in their travel arrangements? on route strategies of cory's shearwater during its trans-equatorial journey.long-distance migrants have developed diverse strategies to deal with the challenges imposed by their annual journeys. these are relatively well studied in some avian groups, such as passerines, shorebirds and raptors. in contrast, few studies have addressed the migratory behaviour of pelagic birds in the light of current theories of optimal migration. using a dataset of 100 complete migratory tracks gathered along four years, we performed a detailed study on the migratory strategy of a pelagic ...201223145168
back home at night or out until morning? nycthemeral variations in homing of anosmic cory's shearwaters in a diurnal colony.olfactory cues have been shown to be important to homing petrels at night, but apparently those procellariiform species that also come back to the colony during the day are not impaired by smell deprivation. however, the nycthemeral distribution of homing, i.e. whether displaced birds released at night return to their burrow by night or during daylight, has never been investigated. to explore this question, we studied the homing behaviour of cory's shearwater (calonectris borealis) in the only k ...201323307801
population connectivity buffers genetic diversity loss in a seabird.ancient dna has revolutionized conservation genetic studies as it allows monitoring of the genetic variability of species through time and predicting the impact of ecosystems' threats on future population dynamics and viability. meanwhile, the consequences of anthropogenic activities and climate change to island faunas, particularly seabirds, remain largely unknown. in this study, we examined temporal changes in the genetic diversity of a threatened seabird, the cory's shearwater (calonectris bo ...201323688345
effect of exotic mammalian predators on parasites of cory's shearwater: ecological effect on population health and breeding success.predator activity around the nests induces stress in breeding birds, which may have weaker immunity and are therefore more susceptible to parasite infections. the influence of predators on parasites has only been observed in land birds, and most studies are experimental. as seabird colonies offer excellent conditions for parasites, here we assess the influence of mouse, rat, and cat activity on parasites in cory's shearwater (calonectris diomedea borealis). adults were examined for blood parasit ...201323708397
oceanic navigation in cory's shearwaters: evidence for a crucial role of olfactory cues for homing after displacement.pelagic birds, which wander in the open sea most of the year and often nest on small remote oceanic islands, are able to pinpoint their breeding colony even within an apparently featureless environment, such as the open ocean. the mechanisms underlying their surprising navigational performance are still unknown. in order to investigate the nature of the cues exploited for oceanic navigation, cory's shearwaters, calonectris borealis, nesting in the azores were displaced and released in open ocean ...201323842626
carry-over effects from breeding modulate the annual cycle of a long-distance migrant: an experimental demonstration.carry-over effects relate to events or processes that influence individual performance in a subsequent season, but their occurrence in the annual cycle of migratory avian taxa is seldom studied. we investigated if different levels of resource allocation to reproduction may result in carry-over effects that change the timing and destination of long-distance migration. we reduced the parental investment of cory's shearwaters calonectris diomedea by removing their chick at an early stage. when comp ...201323923482
population structure and dispersal patterns within and between atlantic and mediterranean populations of a large-range pelagic seabird.dispersal is critically linked to the demographic and evolutionary trajectories of populations, but in most seabird species it may be difficult to estimate. using molecular tools, we explored population structure and the spatial dispersal pattern of a highly pelagic but philopatric seabird, the cory's shearwater calonectris diomedea. microsatellite fragments were analysed from samples collected across almost the entire breeding range of the species. to help disentangle the taxonomic status of th ...201323950986
tracking through life stages: adult, immature and juvenile autumn migration in a long-lived seabird.seasonal long-distance migration is likely to be experienced in a contrasted manner by juvenile, immature and adult birds, leading to variations in migratory routes, timing and behaviour. we provide the first analysis of late summer movements and autumn migration in these three life stages, which were tracked concurrently using satellite tags, geolocators or gps recorders in a long-ranging migratory seabird, the scopoli's shearwater (formerly named cory's shearwater, calonectrisdiomedea) breedin ...201323977344
the lévy flight foraging hypothesis in a pelagic seabird.lévy flight foraging represents an innovative paradigm for the analysis of animal random search by including models of heavy-tailed distribution of move length, which complements the correlated random walk paradigm that is founded on brownian walks. theory shows that the efficiency of the different foraging tactics is a function of prey abundance and dynamics with lévy flight being especially efficient in poor prey fields. lévy flights have been controversial in some quarters, because they previ ...201424102157
plastic debris in mediterranean seabirds.plastic debris is often ingested by marine predators and can cause health disorders and even death. we present the first assessment of plastic ingestion in mediterranean seabirds. we quantified and measured plastics accumulated in the stomach of 171 birds from 9 species accidentally caught by longliners in the western mediterranean from 2003 to 2010. cory's shearwaters (calonectris diomedea) showed the highest occurrence (94%) and large numbers of small plastic particles per affected bird (on av ...201324449923
olfactory foraging in temperate waters: sensitivity to dimethylsulphide of shearwaters in the atlantic ocean and mediterranean sea.many procellariiforms use olfactory cues to locate food patches over the seemingly featureless ocean surface. in particular, some of them are able to detect and are attracted by dimethylsulphide (dms), a volatile compound naturally occurring over worldwide oceans in correspondence with productive feeding areas. however, current knowledge is restricted to sub-antarctic species and to only one study realized under natural conditions at sea. here, for the first time, we investigated the response to ...201424526721
a new species of the feather mite genus rhinozachvatkinia (acari: avenzoariidae) from calonectris shearwaters (procellariiformes: procellariidae): integrating morphological descriptions with dna barcode data.rhinozachvatkinia calonectris sp. n., a new species of the feather mite genus rhinozachvatkinia mironov, 1989 (avenzoariidae: bonnetellinae), is described from two species of shearwaters in the north-east of the atlantic ocean, calonectris edwardsii (oustalet) (type host) and calonectris borealis (cory) (procellariiformes: procellariidae). we completed the morphological description of this new feather mite species with sequence data on the mitochondrial cytochrome c oxidase subunit i gene fragme ...201424684058
how important are seabirds in the diet of black rats on islands with a superpredator?this study assessed the impact of introduced black rats (rattus rattus) on cory's shearwater (calonectris diomedea borealis) in a multi-invaded insular ecosystem where rats are mesopredators. we hypothesized that black rats should have little impact on cory's shearwaters in the presence of cats as superpredators. stomach contents and stable isotope analysis (sia) in tissues of black rats were analyzed to assess the trophic ecology and the importance of cory's shearwater in their diet. we also st ...201424726532
an holistic ecological analysis of the diet of cory's shearwaters using prey morphological characters and dna barcoding.knowledge of the dietary choices and trophic niches of organisms is the key to understanding their roles in ecosystems. in seabird diet studies, prey identification is a difficult challenge, often yielding results with technique-specific biases. additionally, sampling efforts are often not extensive enough to reveal intrapopulational variation. immature animals, which may constitute up to 50% of a population, may occupy a significantly different trophic niche to more experienced birds, but this ...201424806079
plastic ingestion by fulmars and shearwaters at sable island, nova scotia, canada.plastic pollution is widespread in the marine environment, and plastic ingestion by seabirds is now widely reported for dozens of species. beached northern fulmars, great shearwaters, sooty shearwaters and cory's shearwaters are found on sable island, nova scotia, canada regularly, and they can be used to assess plastic pollution. all species except cory's shearwaters contained plastic debris in their gastrointestinal tracts. northern fulmars, sooty shearwaters and great shearwaters all showed h ...201425150895
three new species of the feather mite subfamily ingrassiinae (acariformes: xolalgidae) from shearwaters and petrels (procellariiformes: procellariidae).three new species of the feather mite subfamily ingrassiinae (acariformes: astigmata: xolalgidae) are described from shearwaters and petrels (procellariiformes: procellariidae) in the north-east of atlantic ocean: ingrassia calonectris sp. n. from calonectris borealis (cory) (type host) and calonectris edwardsii (oustalet), ingrassia micronota sp. n. and opetiopoda bulweriae sp. n. from bulweria bulwerii (jardine and selby).201325243277
spatial foraging segregation by close neighbours in a wide-ranging seabird.breeding seabirds are central-place foragers and therefore exploit food resources most intensively nearer their colonies. when nesting aggregations are close to one another density-dependent competition is likely to be high, potentially promoting foraging segregation (i.e. neighbouring colonies may segregate to search for food in different areas). however, little is known about spatial segregation in foraging behaviour between closely adjacent colonies, particularly in species that are wide-rang ...201525307415
long antibody persistence and transgenerational transfer of immunity in a long-lived vertebrate.although little studied in natural populations, the persistence of immunoglobulins may dramatically affect the dynamics of immunity and the ecology and evolution of host-pathogen interactions involving vertebrate hosts. by means of a multiple-year vaccination design against newcastle disease virus, we experimentally addressed whether levels of specific antibodies can persist over several years in females of a long-lived procellariiform seabird-cory's shearwater-and whether maternal antibodies ag ...201425438176
new species of the feather mite genus promegninia gaud & atyeo (acari: avenzoariidae) from petrels and shearwaters (procellariiformes: procellariidae).two new species of the feather mite genus promegninia gaud & atyeo, 1967 (avenzoariidae: bonnetellinae) are described from procellariids in the northeasterm atlantic ocean: promegninia bulweriae n. sp. from the bulwer's petrel bulweria bulwerii (jardine & selby) and p. calonectris n. sp. from the cory's shearwater calonectris borealis (cory) (procellariiformes: procellariidae). males of p bulweriae n. sp. are most clearly distinguished from the other known species in the genus by having short le ...201525557750
gps tracking for mapping seabird mortality induced by light pollution.light pollution and its consequences on ecosystems are increasing worldwide. knowledge on the threshold levels of light pollution at which significant ecological impacts emerge and the size of dark refuges to maintain natural nocturnal processes is crucial to mitigate its negative consequences. seabird fledglings are attracted by artificial lights when they leave their nest at night, causing high mortality. we used gps data-loggers to track the flights of cory's shearwater calonectris diomedea f ...201526035530
pelagic seabird flight patterns are consistent with a reliance on olfactory maps for oceanic navigation.homing studies have provided tantalizing evidence that the remarkable ability of shearwaters (procellariiformes) to pinpoint their breeding colony after crossing vast expanses of featureless open ocean can be attributed to their assembling cognitive maps of wind-borne odours but crucially, it has not been tested whether olfactory cues are actually used as a system for navigation. obtaining statistically important samples of wild birds for use in experimental approaches is, however, impossible be ...201526136443
olfaction and topography, but not magnetic cues, control navigation in a pelagic seabird: displacements with shearwaters in the mediterranean sea.pelagic seabirds wander the open oceans then return accurately to their habitual nest-sites. we investigated the effects of sensory manipulation on oceanic navigation in scopoli's shearwaters (calonectris diomedea) breeding at pianosa island (italy), by displacing them 400‚ÄČkm from their colony and tracking them. a recent experiment on atlantic shearwaters (cory's shearwater, calonectris borealis) breeding in the azores indicated a crucial role of olfaction over the open ocean, but left open the ...201526548946
niche partitioning of feather mites within a seabird host, calonectris borealis.according to classic niche theory, species can coexist in heterogeneous environments by reducing interspecific competition via niche partitioning, e.g. trophic or spatial partitioning. however, support for the role of competition on niche partitioning remains controversial. here, we tested for spatial and trophic partitioning in feather mites, a diverse and abundant group of arthropods. we focused on the two dominant mite species, microspalax brevipes and zachvatkinia ovata, inhabiting flight fe ...201526650672
colony foundation in an oceanic seabird.seabirds are colonial vertebrates that despite their great potential for long-range dispersal and colonization are reluctant to establish in novel locations, often recruiting close to their natal colony. the foundation of colonies is therefore a rare event in most seabird species and little is known about the colonization process in this group. the cory's shearwater (calonectris diomedea) is a pelagic seabird that has recently established three new colonies in galicia (ne atlantic) thus expandin ...201626909694
sex and migratory strategy influence corticosterone levels in winter-grown feathers, with positive breeding effects in a migratory pelagic overcome unpredictable stressful transitory events, animals trigger an allostatic response involving the hypothalamic-pituitary-adrenal cortex. this hormonal response, which involves the release of glucocorticoids which in turn mediate between the main physiological mechanisms that regulate the energetic demands and resource allocation trade-off with behavioural responses to environmental perturbations and may ultimately lead to variation in fitness. we have used the cory's shearwater calonec ...201627053322
lévy patterns in seabirds are multifaceted describing both spatial and temporal patterning.the flight patterns of albatrosses and shearwaters have become a touchstone for much of lévy flight research, spawning an extensive field of enquiry. there is now compelling evidence that the flight patterns of these seabirds would have been appreciated by paul lévy, the mathematician after whom lévy flights are named. here we show that lévy patterns (here taken to mean spatial or temporal patterns characterized by distributions with power-law tails) are, in fact, multifaceted in shearwaters bei ...201627366198
a long-term retrospective study on rehabilitation of seabirds in gran canaria island, spain (2003-2013).the aims of this study were to analyze the causes of morbidity and mortality in a large population of seabirds admitted to the tafira wildlife rehabilitation center (twrc) in gran canaria island, spain, from 2003 to 2013, and to analyze the outcomes of the rehabilitation process.201728475653
environmentally driven sexual segregation in a marine top predator.sexual segregation in foraging occurs in many animal species, resulting in the partitioning of resources and reduction of competition between males and females, yet the patterns and drivers of such segregation are still poorly understood. we studied the foraging movements (gps-tracking), habitat use (habitat modelling) and trophic ecology (stable isotope analysis) of female and male cory's shearwaters calonectris borealis during the mid chick-rearing period of six consecutive breeding seasons (2 ...201728572630
absence of haemosporidian parasite infections in the long-lived cory's shearwater: evidence from molecular analyses and review of the literature.the apparent scarcity or absence of blood parasites in some avian groups, such as seabirds, has been related to intrinsic and extrinsic factors including host immunological capacity, host-parasite assemblage, and ecological parameters, but also to reduced sensitivity of some methods to detect low parasite prevalence/intensities of infection. here, we examined the haemosporidian parasite prevalence in a breeding population of cory's shearwater calonectris diomedea borealis, a long-distance migran ...201829124410
flexible migratory choices of cory's shearwaters are not driven by shifts in prevailing air currents.wind conditions strongly affect migratory costs and shape flyways and detours for many birds, especially soaring birds. however, whether winds also influence individual variability in migratory choices is an unexplored question. cory's shearwaters (calonectris borealis) exhibit migratory flexibility, changing non-breeding destination across the atlantic ocean within and between years. here, we investigated how wind dynamics affect the spatiotemporal migratory behaviour and whether they influence ...201829463896
acuariidae (nematoda) in procellariiformes (aves) on the southern coast of rio grande do sul, brazil.acuariidae nematodes are normally found in the digestive tract of aquatic birds, including procellariiformes. were examined calonectris borealis (n = 4), diomedea exulans (n = 1), macronectes giganteus (n = 8), thalassarche chlororhynchos (n = 5), thalassarche melanophrys (n = 15), procellaria aequinoctialis (n = 4), puffinus gravis (n = 2) and puffinus puffinus (n = 6), collected on the southern coast of rs, brazil. a total of 16 birds (35.5%) were parasitized by two species of acuariidae. steg ...201929513781
occurrence of per- and polyfluoroalkyl substances in calonectris shearwaters breeding along the mediterranean and atlantic colonies.the objective of the present study was to assess the presence of 17 per- and polyfluoroalkyl substances (pfas) in blood of two closely related top predators, the scopoli's (calonectris diomedea) and cory's (c. borealis) shearwaters that breed allopatrically in mediterranean and atlantic basins. among pfas, perfluorooctanesulfononic acid (pfos) and long chain perfluorinated carboxylic acids (pfca) were detected in all samples, highlighting somehow the ubiquity of such pollutants. scopoli's shearw ...201829886955
costs of breeding are rapidly buffered and do not affect migratory behavior in a long-lived bird history theory states that individual fitness in one stage of life is conditioned by what occurred in previous stages. in migratory species, reproductive effort during breeding has often been found to influence body condition, molt schedule, self-provisioning and migration of individuals in subsequent seasons (i.e., carryover effects of breeding). however, there is a current uncertainty in understanding how long-distance migrants trade off among such energy-demanding activities (i.e., breed ...201830063803
are pelagic seabirds exposed to amnesic shellfish poisoning toxins?marine birds have been hypothesized to be underreported victims of harmful algal blooms (habs). toxic blooms of pseudo-nitzschia spp., the primary amnesic toxin producer microalgae, domoic acid (da) are known to cause massive mortalities of coastal seabirds and marine mammals around the world. however, these fatalities are only detected when birds die nearby the coastline and little is known about possible outbreaks of pelagic seabirds in oceanic areas. here we aim to understand whether pelagic ...201931128801
an ontogenetic perspective on migratory strategy of a long-lived pelagic seabird: timings and destinations change progressively during maturation.the processes that drive the ontogeny of migratory strategies in long-lived animals with slow maturation remain enigmatic. while some short-lived migrants are known or believed to repeat the same migratory patterns throughout their lives, little is known on the time required for immature long-lived migrants to progressively acquire adult-like migratory behaviours, or which aspects take longer to refine during the maturation process. here, we studied the ontogeny of long-distance migratory strate ...202031206644
spontaneous primary right tibiotarsal osteosarcoma with pulmonary metastasis in a free-ranging cory's shearwater (calonectris diomedea).we report the pathologic features of a primary right tibiotarsal productive osteoblastic osteosarcoma with pulmonary metastasis, a unique finding in a cory's shearwater (calonectris diomedea).202031237823
year-round individual specialization in the feeding ecology of a long-lived seabird.many generalist species are composed of individuals varying in the size of their realized niches within a population. to understand the underlying causes and implications of this phenomenon, repeated samplings on the same individuals subjected to different environmental conditions are needed. here, we studied individual specialization of feeding strategies in breeding and non-breeding grounds of cory's shearwaters (calonectris borealis) for 2-8 years, and its relationship with fitness. individua ...201931413291
does sexual segregation occur during the nonbreeding period? a comparative analysis in spatial and feeding ecology of three calonectris shearwaters.sexual segregation (ss) is widespread among animal taxa, with males and females segregated in distribution, behavior, or feeding ecology but so far, most studies on birds have focused on the breeding period. outside this period, the relevance of segregation and the potential drivers of its persistence remain elusive, especially in the marine environment, where animals can disperse over vast areas and are not easily observed. we evaluated the degree of ss in spatio-temporal distribution and pheno ...201931624542
signature of adaptive evolution in olfactory receptor genes in cory's shearwater supports molecular basis for smell in procellariiform seabirds.olfactory receptors (ors), encoded by the largest vertebrate multigene family, enable the detection of thousands of unique odorants in the environment and consequently play a critical role in species survival. here, we advance our knowledge of or gene evolution in procellariiform seabirds, an avian group which relies on the sense of olfaction for critical ecological functions. we built a cosmid library of cory's shearwater (calonectris borealis) genomic dna, a model species for the study of olfa ...202031953474
wildlife inventory from camera-trapping surveys in the azores (pico and terceira islands).the present publication provides a dataset from five camera-trapping sampling campaigns on two islands of the azorean archipelago (pico and terceira islands), between 2013-2018. this dataset was obtained as a by-product of campaigns designed for different purposes. the sampling campaigns were designed to: (i) study the ecology of introduced mammals; (ii) assess the impact of introduced mammals on native birds (azores woodpigeon - columba palumbus azorica and cory's shearwater - calonectris diome ...202032030070
exploration and refinement of migratory routes in long-lived focus: campioni l., dias m. p., granadeiro j. p., & catry p. (2019). an ontogenetic perspective on migratory strategy of a long-lived pelagic seabird: timings and destinations change progressively during maturation. journal of animal ecology, 89, 29-43. how migration routes develop in long-lived migratory animals remains poorly understood. campioni et al. (2019) tracked the migration of immature and breeding cory's shearwaters and found that the timings ...202032091641
sex-specific telomere length and dynamics in relation to age and reproductive success in cory's shearwaters.individuals in free-living animal populations generally differ substantially in reproductive success, lifespan and other fitness-related traits, but the molecular mechanisms underlying this variation are poorly understood. telomere length and dynamics are candidate traits explaining this variation, as long telomeres predict a higher survival probability and telomere loss has been shown to reflect experienced "life stress." however, telomere dynamics among very long-lived species are unresolved. ...202032141666
oceans of stimuli: an individual-based model to assess the role of olfactory cues and local enhancement in seabirds' foraging behaviour.oceans are extremely dynamic environments, which poses challenges for top-predators such as seabirds to find food resources. yet, seabirds evolved sensorial abilities (olfactory senses) along with complex behaviours (social information transfer through local enhancement) to improve foraging efficiency. using the cory's shearwater (calonectris borealis) as a model species, we developed an individual-based model to explore the complementary role of different searching mechanisms (olfactory foragin ...202032152923
generalist seabirds as biomonitors of ocean mercury: the importance of accurate trophic position assignment.monitoring mercury concentration in the marine environment is pivotal due to the risks that mercury intake poses to the ecosystem and human health. it is therefore of interest to make reliable, comparative measurements over large geographic areas. here, the utility of wide-ranging generalist seabirds as mercury biomonitors at an ocean basin scale was assessed, using the cory's shearwater as a model species. the mercury concentration in flight feathers moulted at distant non-breeding areas of geo ...202032563885
costs of reproduction and migration are paid in later return to the colony, not in physical condition, in a long-lived history theory suggests a trade-off between costly activities such as breeding and migration and somatic self-maintenance. however, how the short-term cost of parental effort is expressed in species with a slow pace-of-life is not well understood. also, investigating carry-over effects of migration is most meaningful when comparing migratory strategies within the same population, but this has rarely been done. we explore this hypothesis in a long-lived, pelagic seabird, the cory's shearwate ...202033040163
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