| euschoengastia suzukii (acari: trombiculidae): a new species of chigger mite collected from soil samples in the nest burrows of streaked shearwater in japan. | euschoengastia suzukii takahashi, fukaya & takahashi is described and illustrated. the type material was collected from soil samples in the nest burrows of the sea bird streaked shearwater, calonectris leucomelas (temminck), living on mikurajima island in tokyo; oomorijima island, oki, shimane prefecture; and awashima island, niigata prefecture, in japan, indicating that c. leucomelas is the main parasitic host of e. suzukii new species. | 2005 | 16119540 |
| ixodes philipi (acari: ixodidae): phylogenetic status inferred from mitochondrial cytochrome oxidase subunit i gene sequence comparison. | ixodes philipi ticks were collected from the nest burrows of streaked shearwaters, calonectris luecomelas, on 3 different islands of japan (awashima: 38 degrees 45'n, 139 degrees 24'e; mikurajima: 33 degrees 52'n, 139 degrees 36'e; and omorijima: 36 degrees 8'n, 133 degrees 10'e). the mitochondrial cytochrome oxidase subunit i (coi) gene sequence was determined for each tick. the coi sequences of 9 other ixodid tick species also were determined, and they were used for taxonomic positioning of i. ... | 2007 | 17626375 |
| 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 ... | 2006 | 16814569 |
| dominant parasympathetic modulation of heart rate and heart rate variability in a wild-caught seabird. | heart rate (hr) and heart rate variability (hrv) provide noninvasive measures of the relative activity of the parasympathetic nervous system (pns), which promotes self-maintenance and restoration, and the sympathetic nervous system (sns), which prepares an animal for danger. the pns decreases hr, whereas the sns increases hr. the pns and sns also contribute to oscillations in heartbeat intervals at different frequencies, producing hrv. hrv promotes resilience and adjustment capacity in the organ ... | 2017 | 27327178 |
| high levels of isotope elimination improve precision and allow individual-based measurements of metabolic rates in animals using the doubly labeled water method. | doubly labeled water (dlw) can be used to measure energy expenditure in free-ranging animals, but questions have been raised about its accuracy in different species or contexts. we investigated whether differences in the extent of isotope elimination affects the precision and accuracy of the dlw method, which can vary according to the experimental design or metabolic rate of the species. estimated total energy expenditure by the dlw method (teedlw) was compared with actual total energy expenditu ... | 2015 | 26611463 |
| contaminants in tracked seabirds showing regional patterns of marine pollution. | ocean-scale monitoring of pollution is challenging. seabirds are useful indicators because they travel over a broad foraging range. nevertheless, this coarse spatial resolution is not fine enough to discriminate pollution in a finer scale. previous studies have demonstrated that pollution levels are higher in the sea of japan and south and east china seas than the northen pacific ocean. to test these findings in a wide-ranging animal, we tracked streaked shearwaters (calonectris leucomelas) from ... | 2013 | 23755887 |
| toward the quantification of a conceptual framework for movement ecology using circular statistical modeling. | to analyze an animal's movement trajectory, a basic model is required that satisfies the following conditions: the model must have an ecological basis and the parameters used in the model must have ecological interpretations, a broad range of movement patterns can be explained by that model, and equations and probability distributions in the model should be mathematically tractable. random walk models used in previous studies do not necessarily satisfy these requirements, partly because movement ... | 2012 | 23226261 |
| transport and release of chemicals from plastics to the environment and to wildlife. | plastics debris in the marine environment, including resin pellets, fragments and microscopic plastic fragments, contain organic contaminants, including polychlorinated biphenyls (pcbs), polycyclic aromatic hydrocarbons, petroleum hydrocarbons, organochlorine pesticides (2,2'-bis(p-chlorophenyl)-1,1,1-trichloroethane, hexachlorinated hexanes), polybrominated diphenylethers, alkylphenols and bisphenol a, at concentrations from sub ng g(-1) to microg g(-1). some of these compounds are added during ... | 2009 | 19528054 |
| ixodes philipi: redescription of female and first description of male, with records from streaked shearwater in japan (acarina: ixodidae). | ixodes philipi keirans & kohls, 1970 is so far known only from two female specimens taken from the streaked shearwater, puffinus leucomelas (temminck, 1835) [presently calonectris leucomelas (temminck, 1835)], or the madeiran storm-petrel, oceanodroma castro (harcourt, 1851), in japan. we redescribe the female and describe the male of this species. we used nine adults (four males and five females) taken from the bodies of c. leucomelas and/or soil samples of their nest burrows in japan, indicati ... | 2005 | 15962766 |
| heart rate variability reveals that a decrease in parasympathetic ('rest-and-digest') activity dominates autonomic stress responses in a free-living seabird. | the autonomic stress response, often referred to as the 'fight-or-flight' response, is a highly conserved physiological reaction to stress in vertebrates that occurs via a decrease in parasympathetic (pns) activity, which promotes self-maintenance 'rest and digest' processes, and an increase in sympathetic (sns) activity, which prepares an animal for danger ('fight-or-flight'). though the pns and sns both innervate most organs, they often control different tissues and functions within those orga ... | 2017 | 28746844 |
| statistical integration of tracking and vessel survey data to incorporate life history differences in habitat models. | habitat use is often examined at a species or population level, but patterns likely differ within a species, as a function of the sex, breeding colony, and current breeding status of individuals. hence, within-species differences should be considered in habitat models when analyzing and predicting species distributions, such as predicted responses to expected climate change scenarios. also, species' distribution data obtained by different methods (vessel-survey and individual tracking) are often ... | 2015 | 26910963 |
| population declines and heavy metal exposure of swinhoe's storm petrels (oceanodroma monorhis) breeding on the southwest coast of korea. | we investigated the population dynamics of globally near-threatened swinhoe's storm petrels on kugul and chilbal islets where >90% of the world breeding population have resided for >25 years. we also determined the levels of six heavy metals in the seabird species as a possible factor affecting reproduction. of the 892 and 307 marked burrows since 1986, the breeding density of swinhoe's storm petrels has changed significantly, based on a 55% decline at kugul islet, and a 39% decline at chilbal i ... | 2012 | 23140851 |
| global monitoring of persistent organic pollutants (pops) using seabird preen gland oil. | situated at high positions on marine food webs, seabirds accumulate high concentrations of persistent organic pollutants (pops), such as polychlorinated biphenyls (pcbs), dichlorodiphenyltrichloroethane and its metabolites (ddts), and hexachlorocyclohexanes (hchs). our previous studies proposed the usefulness of seabirds preen gland oil as a nondestructive biomonitoring tool. the present study applied this approach to 154 adult birds of 24 species collected from 11 locations during 2005-2016 to ... | 2018 | 30232531 |
| ontogeny of surface texture of limb bones in modern aquatic birds and applicability of textural ageing. | despite its importance in various disciplines, a general method to assess ontogenetic ages of skeletal and fossil specimens has been lacking for birds. although the textural ageing method was formulated to assess relative ontogenetic ages of specimens from inspection of bone surface textures, the exact correspondence of surface textures to ontogenetic stages has not yet been clear. in this study, bone surface textures of six major limb bones (humerus, ulna, carpometacarpus, femur, tibiotarsus, a ... | 2018 | 29195009 |
| in vivo accumulation of plastic-derived chemicals into seabird tissues. | plastic debris is ubiquitous and increasing in the marine environment [1]. a wide range of marine organisms ingest plastic, and its impacts are of growing concern [2]. seabirds are particularly susceptible to plastic pollution because of high rates of ingestion [3]. because marine plastics contain an array of hazardous compounds, the chemical impacts of ingestion are concerning. several studies on wild seabirds suggested accumulation of plastic-derived chemicals in seabird tissues [4-7]. however ... | 2020 | 32008901 |
| individual differences in heart rate reveal a broad range of autonomic phenotypes in a free-living seabird population. | animals in the same population consistently differ in their physiology and behaviour, but the underlying mechanisms remain poorly understood. as the autonomic nervous system regulates wide-ranging physiological functions, many of these phenotypic differences may be generated by autonomic activity. we investigated for the first time in a free-living animal population (the streaked shearwater, calonectris leucomelas, a long-lived seabird) whether individuals consistently differ in autonomic activi ... | 2018 | 30127079 |
| compass orientation drives naïve pelagic seabirds to cross mountain ranges. | wildlife migration is a spectacular phenomenon [1]. studies using telemetry - tracking devices attached on free-living animals - have shown that large topographic barriers and obstacles, such as oceans and deserts, elicit extreme feats of migration [2]. overcoming the challenges of these obstacles might require experience and skill that young individuals lack [2-5]. further, younger, inexperienced animals might determine their migration routes using navigation strategies different from those of ... | 2017 | 29112864 |