ORCID Profile
0000-0002-9868-0408
Current Organisation
National Institute of Polar Research, Japan
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Publisher: Routledge
Date: 29-01-2016
Publisher: Public Library of Science (PLoS)
Date: 21-10-2015
Publisher: Wiley
Date: 20-06-2016
Publisher: American Association for the Advancement of Science (AAAS)
Date: 05-03-2021
Abstract: Highly-threatened seabirds connect many countries and the high seas and therefore depend on coordinated ocean governance.
Publisher: Public Library of Science (PLoS)
Date: 14-10-2015
Publisher: Wiley
Date: 16-01-2016
Publisher: Wiley
Date: 20-07-2018
DOI: 10.1111/GCB.14377
Abstract: The Southern Ocean is currently experiencing major environmental changes, including in sea-ice cover. Such changes strongly influence ecosystem structure and functioning and affect the survival and reproduction of predators such as seabirds. These effects are likely mediated by reduced availability of food resources. As such, seabirds are reliable eco-indicators of environmental conditions in the Antarctic region. Here, based on 9 years of sea-ice data, we found that the breeding success of Adélie penguins (Pygoscelis adeliae) reaches a peak at intermediate sea-ice cover (ca. 20%). We further examined the effects of sea-ice conditions on the foraging activity of penguins, measured at multiple scales from in idual es to foraging trips. Analysis of temporal organisation of es, including fractal and bout analyses, revealed an increasingly consistent behaviour during years with extensive sea-ice cover. The relationship between several e parameters and sea-ice cover in the foraging area appears to be quadratic. In years of low and high sea-ice cover, in iduals adjusted their ing effort by generally ing deeper, more frequently and by resting at the surface between es for shorter periods of time than in years with intermediate sea-ice cover. Our study therefore suggests that sea-ice cover is likely to affect the reproductive performance of Adélie penguins through its effects on foraging behaviour, as breeding success and most ing parameters share a common optimum. Some years, however, deviated from this general trend, suggesting that other factors (e.g. precipitation during the breeding season) might sometimes become preponderant over the sea-ice effects on breeding and foraging performance. Our study highlights the value of monitoring fitness parameters and in idual behaviour concomitantly over the long-term to better characterize optimal environmental conditions and potential resilience of wildlife. Such an approach is crucial if we want to anticipate the effects of environmental change on Antarctic penguin populations.
Publisher: Elsevier BV
Date: 05-2019
DOI: 10.1016/J.TREE.2019.01.009
Abstract: There have been efforts around the globe to track in iduals of many marine species and assess their movements and distribution, with the putative goal of supporting their conservation and management. Determining whether, and how, tracking data have been successfully applied to address real-world conservation issues is, however, difficult. Here, we compile a broad range of case studies from erse marine taxa to show how tracking data have helped inform conservation policy and management, including reductions in fisheries bycatch and vessel strikes, and the design and administration of marine protected areas and important habitats. Using these ex les, we highlight pathways through which the past and future investment in collecting animal tracking data might be better used to achieve tangible conservation benefits.
Publisher: Wiley
Date: 08-2018
DOI: 10.1002/ECS2.2392
Publisher: Elsevier BV
Date: 12-2018
Publisher: Elsevier BV
Date: 06-2016
DOI: 10.1016/J.TREE.2016.02.015
Abstract: It is a golden age for animal movement studies and so an opportune time to assess priorities for future work. We assembled 40 experts to identify key questions in this field, focussing on marine megafauna, which include a broad range of birds, mammals, reptiles, and fish. Research on these taxa has both underpinned many of the recent technical developments and led to fundamental discoveries in the field. We show that the questions have broad applicability to other taxa, including terrestrial animals, flying insects, and swimming invertebrates, and, as such, this exercise provides a useful roadmap for targeted deployments and data syntheses that should advance the field of movement ecology.
Publisher: Springer Science and Business Media LLC
Date: 18-04-2020
Publisher: Springer Science and Business Media LLC
Date: 18-03-2020
DOI: 10.1038/S41597-020-0406-X
Abstract: The Retrospective Analysis of Antarctic Tracking Data (RAATD) is a Scientific Committee for Antarctic Research project led jointly by the Expert Groups on Birds and Marine Mammals and Antarctic Bio ersity Informatics, and endorsed by the Commission for the Conservation of Antarctic Marine Living Resources. RAATD consolidated tracking data for multiple species of Antarctic meso- and top-predators to identify Areas of Ecological Significance. These datasets and accompanying syntheses provide a greater understanding of fundamental ecosystem processes in the Southern Ocean, support modelling of predator distributions under future climate scenarios and create inputs that can be incorporated into decision making processes by management authorities. In this data paper, we present the compiled tracking data from research groups that have worked in the Antarctic since the 1990s. The data are publicly available through bio ersity.aq and the Ocean Biogeographic Information System. The archive includes tracking data from over 70 contributors across 12 national Antarctic programs, and includes data from 17 predator species, 4060 in idual animals, and over 2.9 million observed locations.
No related grants have been discovered for Akinori Takahashi.