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12 results for “auklet”
Рис. 4. РаспреΑеΛение чистиковых птиц (А — тонкокΛювая и тоΛстокΛювая кайры, Б — боΛьшая конюга, В — конюга-крошка, Г — топорок) в Охотском море и сопреΑеΛьных воΑах Тихого океана и Японского моря по резуΛьтатам суΑовых учетов в февраΛе — мае 2020 г. (особей/км2 на 10-минутных трансектах). СпΛошными Λиниями показаны учетные трансекты, пунктиром — 200-метровая изобата Fig. 4. Distribution of alcids — (А) common and thick-billed murres, (Б) crested auklet, (В) least auklet, (Г) tufted puffin — in the Sea of Okhotsk and adjacent waters of the Pacific Ocean and the Sea of Japan in February–May 2020 (birds/km2 on 10-minute transects). Solid lines indicate transects, dotted line indicates a 200 m isobath in Population of seabirds in the Sea of Okhotsk and adjacent waters of the Pacific Ocean and the Sea of Japan during the winter-spring period of 2020
Рис. 4. РаспреΑеΛение чистиковых птиц (А — тонкокΛювая и тоΛстокΛювая кайры, Б — боΛьшая конюга, В — конюга-крошка, Г — топорок) в Охотском море и сопреΑеΛьных воΑах Тихого океана и Японского моря по резуΛьтатам суΑовых учетов в февраΛе — мае 2020 г. (особей/км2 на 10-минутных трансектах). СпΛошными Λиниями показаны учетные трансекты, пунктиром — 200-метровая изобата Fig. 4. Distribution of alcids — (А) common and thick-billed murres, (Б) crested auklet, (В) least auklet, (Г) tufted puffin — in the Sea of Okhotsk and adjacent waters of the Pacific Ocean and the Sea of Japan in February–May 2020 (birds/km2 on 10-minute transects). Solid lines indicate transects, dotted line indicates a 200 m isobath
Experience and trust: The benefits of mate familiarity are realized through sex-specific specialization of parental roles in cassin’s auklet
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Data from: Genetic-environment associations explain genetic differentiation and variation between western and eastern North Pacific Rhinoceros Auklet (Cerorhinca monocerata) breeding colonies
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Extensive variation in feather ornaments of Whiskered Auklets in the Aleutian Islands reflects age, sex, condition, and geography
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rhinoceros auklet microsatellite data
<p>We tested the hypothesis that segregation in wintering areas promotes population differentiation in a sentinel North Pacific seabird, the rhinoceros auklet (<i>Cerorhinca monocerata</i>). We collected tissue samples for genetic analyses on five breeding colonies in the western Pacific Ocean (Japan) and 13 in the eastern Pacific Ocean (California to Alaska), and deployed light-level geologgers on 12 eastern Pacific colonies to delineate wintering areas. Loggers were deployed previously on one colony in Japan. There was strong genetic differentiation between populations in the eastern vs. western Pacific. Deep-ocean habitat along the northern continental shelf appears to act as a barrier to dispersal; abundant in the western and eastern Pacific Ocean, the rhinoceros auklet is virtually absent as a breeder in the Aleutian Islands and Bering Sea, and no loggered birds crossed the North Pacific in the non-breeding season. Late Pleistocene glaciation over the North Pacific also might have forced a southward range shift that isolated the western and eastern populations. While genetic differentiation was strongest between the eastern vs. western Pacific, there was also extensive differentiation within both regional groups. In pairwise comparisons among eastern Pacific colonies, the standardized measure of genetic differentiation (F'<sub>ST</sub>) was negatively correlated with the extent of spatial overlap in wintering areas. That result supports the hypothesis that segregation in the non-breeding season promotes genetic structuring. Strong natal philopatry and a neritic foraging habit probably also play roles. Widely distributed, vulnerable to anthropogenic stressors, and exhibiting extensive genetic structure, the rhinoceros auklet encompasses the scope of the conservation challenges posed by seabirds.</p>
Data from: The fossil record and phylogeny of the auklets (Pan-Alcidae, Aethiini)
The auklets Aethia and Ptychoramphus comprise the smallest known Alcidae (Aves, Charadriiformes) and have a fossil record that extends into the Miocene. The evolution of auklets is poorly understood because systematic hypotheses of relationships among extant auklets are largely incongruent, the morphology of auklet fossils has not been evaluated in detail, and extinct species of auklets have not been previously included in a phylogenetic analysis. Previously described auklet fossil remains are reviewed and two new species of auklet, Aethia barnesi and Aethia storeri, are described from the Miocene and Pliocene of southern California, USA. Previously described auklet fossil remains, the two newly described extinct species of auklet, and extant species of auklets and other alcids are included in combined phylogenetic analyses of morphological and molecular sequence data. Based on the results of the phylogenetic analyses, the taxonomy of fossils referred to Aethiini is revised and the evolution of the clade is evaluated in a phylogenetic context. The osteological morphology of extinct auklets appears to be little-changed from their extant relatives, suggesting that the ecological attributes of these small wing-propelled divers may also be relatively unchanged since the Miocene.
Data from: The fossil record and phylogeny of the auklets (Pan-Alcidae, Aethiini)
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Acceleration and depth data on foraging behaviour of rhinoceros auklets breeding at Teuri Island
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rhinoceros auklet microsatellite data
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Oceanographic drivers of winter habitat use in Cassin's auklets
<p>Reduced prey abundance and severe weather can lead to a greater risk of mortality for seabirds during the non-breeding winter months. Resource patterns in some regions are shifting and becoming more variable in relation to past conditions, potentially further impacting survival and carryover to the breeding season. As animal tracking technologies and methods to analyze movement data have advanced, it has become increasingly feasible to draw fine-scale inference about how environmental variation affects foraging behavior and habitat use of seabirds during this critical period. Here, we used archival light-sensing tags to evaluate how inter-annual variation in oceanography affected the winter distribution of Cassin's auklets from Southeast Farallon Island, California. Thirty-five out of 93 geolocators deployed from 2015–2017 were recovered and successfully recorded light-level data, from which geographic positions were estimated. Step-selection functions were applied to identify environmental covariates that best explained winter movement decisions and habitat use, revealing Cassin's auklets dispersed farther from the colony during a winter with warm SST anomalies, but remained more centralized near the breeding colony during two average winters. Movement patterns were driven by avoidance of areas with higher sea surface temperatures and possible limits of dispersal from the breeding colony, and selection for areas with well-defined mesoscale fronts and cooler surface waters. Through multiple years of tagging and the application of step-selection functions, a robust and widely applied approach for analyzing animal movement in terrestrial species, we show how inter-annual differences in the movement patterns of a small seabird are driven by oceanographic variability across years. Understanding the winter habitat use of seabirds can help inform changes in population structure and measures of reproductive success, aiding managers in determining potential causes of breeding failures.</p>
Data from: Increased reproductive investment associated with greater survival and longevity in Cassin’s auklets
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Oceanographic drivers of winter habitat use in Cassin's auklets
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International Brain Laboratory public data
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OpenNeuro
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