| distribution and abundance of the tick ixodes uriae in a diverse subantarctic seabird community. | at bird island, south georgia, we surveyed the distribution and abundance of ticks on the vertebrate fauna and found only 1 species ixodes uriae. we classified all seabird species into 3 groups: (1) seabirds nesting on the surface of the ground solitarily, in dispersed groups of a few nests, or in colonies with well-spaced nests; (2) seabirds nesting on the surface of the ground in dense colonies; and (3) seabirds nesting in dense colonies in burrows or rock crevices. we detected i. uriae only o ... | 1999 | 10207358 |
| permanent genetic resources added to molecular ecology resources database 1 february 2012 - 31 march 2012. | this article documents the addition of 171 microsatellite marker loci and 27 pairs of single nucleotide polymorphism (snp) sequencing primers to the molecular ecology resources database. loci were developed for the following species: bombus pauloensis, cephalorhynchus heavisidii, cercospora sojina, harpyhaliaetus coronatus, hordeum vulgare, lachnolaimus maximus, oceanodroma monteiroi, puccinia striiformis f. sp. tritici, rhea americana, salmo salar, salmo trutta, schistocephalus solidus, sousa p ... | 2012 | 22642264 |
| contrasting drivers of reproductive ageing in albatrosses. | age-related variation in reproductive performance is ubiquitous in wild vertebrate populations and has important consequences for population and evolutionary dynamics. the ageing trajectory is shaped by both within-individual processes, such as improvement and senescence, and the among-individual effects of selective appearance and disappearance. to date, few studies have compared the role of these different drivers among species or populations. in this study, we use nearly 40 years of longitudi ... | 2017 | 28605018 |
| classification of animal movement behavior through residence in space and time. | identification and classification of behavior states in animal movement data can be complex, temporally biased, time-intensive, scale-dependent, and unstandardized across studies and taxa. large movement datasets are increasingly common and there is a need for efficient methods of data exploration that adjust to the individual variability of each track. we present the residence in space and time (rst) method to classify behavior patterns in movement data based on the concept that behavior states ... | 2017 | 28045906 |
| proximate drivers of spatial segregation in non-breeding albatrosses. | many animals partition resources to avoid competition, and in colonially-breeding species this often leads to divergent space or habitat use. during the non-breeding season, foraging constraints are relaxed, yet the patterns and drivers of segregation both between and within populations are poorly understood. we modelled habitat preference to examine how extrinsic (habitat availability and intra-specific competition) and intrinsic factors (population, sex and breeding outcome) influence the dist ... | 2016 | 27443877 |
| postmigratory body condition and ovarian steroid production predict breeding decisions by female gray-headed albatrosses. | carryover effects have been documented in many migratory bird species, but we know little about the physiological mechanisms that mediate those effects. here we show that the energetic, endocrine, and aerobic characteristics of postmigratory female gray-headed albatrosses (thalassarche chrysostoma) can affect their decision to breed. all females in this study, whether breeding or not, were secreting ovarian steroids when they arrived at the breeding colony at bird island, south georgia, which su ... | 2015 | 24241072 |
| senescence effects in an extremely long-lived bird: the grey-headed albatross thalassarche chrysostoma. | studies attempting to document reproductive or other pre-lethal senescence effects in wild birds typically face an array of problems, including flaws in statistical analyses, non-adaptive philopatry to deteriorating environments, confounding effects arising from cohort heterogeneity and differential death rates of phenotypes and the frequent pairing of old birds to younger mates. furthermore, recent studies suggest that birds could maintain a high level of physical fitness until old age, before ... | 2006 | 16769633 |
| protein deimination and extracellular vesicle profiles in antarctic seabirds. | pelagic seabirds are amongst the most threatened of all avian groups. they face a range of immunological challenges which seem destined to increase due to environmental changes in their breeding and foraging habitats, affecting prey resources and exposure to pollution and pathogens. therefore, the identification of biomarkers for the assessment of their health status is of considerable importance. peptidylarginine deiminases (pads) post-translationally convert arginine into citrulline in target ... | 2020 | 31936359 |
| foraging in a dynamic environment: response of four sympatric sub-antarctic albatross species to interannual environmental variability. | seasonal and annual climate variations are linked to fluctuations in the abundance and distribution of resources, posing a significant challenge to animals that need to adjust their foraging behavior accordingly. particularly during adverse conditions, and while energetically constrained when breeding, animals ideally need to be flexible in their foraging behavior. such behavioral plasticity may separate "winners" from "losers" in light of rapid environmental changes due to climate change. here, ... | 2020 | 33144964 |
| albatrosses and petrels at south georgia as sentinels of marine debris input from vessels in the southwest atlantic ocean. | increasing amounts of anthropogenic debris enter the ocean because of mismanagement in coastal communities and, despite a global ban on deliberate dumping, also from vessels, endangering wildlife. assessing marine plastic pollution directly is challenging, and an alternative is to use seabirds as bioindicators. our analyses of long time-series (26-years) revealed substantial variation in the amount, characteristics and origin of marine debris (mainly macroplastics and mesoplastics, and excluding ... | 2020 | 31927465 |
| quantifying individual specialization using tracking data: a case study on two species of albatrosses. | many predictive models of spatial and temporal distribution (e.g. in response to climate change or species introductions) assume that species have one environmental niche that applies to all individuals. however, there is growing evidence that individuals can have environmental preferences that are narrower than the species niche. such individual specialization has mainly been studied in terms of dietary niches, but a recent increase in the availability of individual movement data opens the poss ... | 2018 | 30220735 |
| molecular characterization and lesions associated with diomedenema diomedeae (aproctoidea: desmidocercidae) from grey-headed albatrosses (thalassarche chrysostoma) on subantarctic marion island. | the prince edward islands are subantarctic islands in the southwest indian ocean that are of global importance as seabird nesting sites, and are breeding grounds for five species of albatrosses (procellariiformes: diomedeidae). in march-april 2016 numerous chicks of one of these species, the grey-headed albatross (thalassarche chrysostoma), were found dead at colonies on marion island (46°57's 37°42'e), the larger of the two prince edward islands. affected chicks were weak, prostrated, apathetic ... | 2018 | 29988875 |