ORCID Profile
0000-0002-8947-3634
Current Organisation
Centre d'Etudes Biologiques de Chizé
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Publisher: Springer Science and Business Media LLC
Date: 06-01-2006
Publisher: Public Library of Science (PLoS)
Date: 20-04-2012
Publisher: Public Library of Science (PLoS)
Date: 21-10-2015
Publisher: Springer Science and Business Media LLC
Date: 12-06-2012
Publisher: Wiley
Date: 24-05-2020
DOI: 10.1002/ECE3.6393
Publisher: Springer Science and Business Media LLC
Date: 06-2017
Publisher: Springer Science and Business Media LLC
Date: 13-08-2015
Publisher: Inter-Research Science Center
Date: 15-11-2018
DOI: 10.3354/MEPS12764
Publisher: Elsevier BV
Date: 02-2007
Publisher: Elsevier BV
Date: 02-2015
Publisher: Inter-Research Science Center
Date: 18-01-2008
DOI: 10.3354/ESR00069
Publisher: Wiley
Date: 11-2009
DOI: 10.2193/2008-146
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: The Royal Society
Date: 11-2020
DOI: 10.1098/RSOS.191511
Abstract: Most Procellariform seabirds are pelagic, breed in summer when prey availability peaks, and migrate for winter. They also display a dual foraging strategy (short and long trips) and sex-specific foraging. The Westland petrel Procellaria westlandica , a New Zealand endemic, is one of the rare seabirds breeding in winter. Preliminary findings on this large and sexually dimorphic petrel suggest a foraging behaviour with no evidence of a dual strategy, within a narrow range and with shared areas between sexes. To investigate further this unusual strategy, the present study determined the fine-scale at-sea behaviours (global positioning system and accelerometer data loggers) and trophic niches (stable isotopes in whole blood) of chick-rearing in iduals (16 males and 13 females). All in iduals foraged on the shelf-slope of the west coast of New Zealand's South Island with short, unimodal trips. Both sexes foraged at similar intensity without temporal, spatial or isotopic niche segregation. These findings suggest the presence of a winter prey resource close to the colony, sufficient to satisfy the nutritional needs of breeding without increasing the foraging effort or intra-specific competition avoidance during winter. Additional data are needed to assess the consistency of foraging niche between the sexes and its reproductive outcomes in view of anticipated environmental changes.
Publisher: Wiley
Date: 14-07-2015
DOI: 10.1111/ECOG.01021
Publisher: Springer Science and Business Media LLC
Date: 20-07-2014
DOI: 10.1007/S00442-014-3018-3
Abstract: Competition for food resources can result in spatial and dietary segregation among in iduals from the same species. Few studies have looked at such segregations with the combined effect of sex and age in species with short foraging ranges. In this study we examined the 3D spatial use of the environment in a species with a limited foraging area. We equipped 26 little penguins (Eudyptula minor) of known age, sex, and breeding output with GPS (location) and accelerometer (body acceleration and e depth) loggers. We obtained dietary niche information from the isotopic analysis of blood tissue. We controlled for confounding factors of foraging trip length and food availability by s ling adults at guard stage when parents usually make one-day trips. We observed a spatial segregation between old (>11 years old) and middle-aged penguins (between 5 and 11 years old) in the foraging area. Old penguins foraged closer to the shore, in shallower water. Despite observing age-specific spatial segregation, we found no differences in the ing effort and foraging efficiency between age classes and sexes. Birds appeared to target similar prey types, but showed age-specific variation in their isotopic niche width. We hypothesize that this age-specific segregation was primarily determined by a "cohort effect" that would lead in iduals sharing a common life history (i.e. having fledged and dispersed around the same age) to forage preferentially together or to share similar foraging limitations.
Publisher: Wiley
Date: 17-10-2014
DOI: 10.1111/ECOG.01182
Publisher: Inter-Research Science Center
Date: 30-05-2013
DOI: 10.3354/MEPS10301
Publisher: Elsevier BV
Date: 10-2015
Publisher: Oxford University Press (OUP)
Date: 07-2008
Publisher: Cold Spring Harbor Laboratory
Date: 07-2023
DOI: 10.1101/2023.06.30.547199
Abstract: The COVID-19 pandemic and its lock-down measures have resulted in periods of reduced human activity, known as anthropause. While this period was expected to be favorable for the marine ecosystem, due to a probable reduction of pollution, shipping traffic, industrial activity and fishing pressure, negative counterparts such as the increased use of disposable plastic and reduced fisheries surveillance and enforcement could counterbalance these positive effects. Simultaneously, on-land pressure due to human disturbance and tourism should have drastically decreased, potentially benefiting land-based marine breeders such as seabirds. Thus, long-term datasets became crucial to differentiate between historical trends and any evident changes resulting from the anthropause. We analyzed 11 years of data on several biological parameters of little penguins ( Eudyptula minor ) from the Penguin Parade ®, a popular tourist attraction at Phillip Island, Australia. We investigated the impact of anthropogenic activities on penguin behavior during the breeding season measured by (1) distribution at sea, (2) colony attendance, (3) isotopic niche (4) chick meal mass, and (5) offspring investment against shipping traffic and number of tourists. The 2020 lock-downs resulted in a near absence of tourists visiting the Penguin Parade ®, which was otherwise visited by 800,000+ visitors on average per year. However, our long-term analysis showed no effect of the presence of visitors on little penguins’ activities. Surprisingly, the anthropause did not triggered any changes in maritime traffic intensity and distribution in the region. While we found significant inter- and intra-annual variations for most parameters, we detected a negative effect of marine traffic on the foraging efficiency. Our results suggest that environmental variations have a greater influence on the breeding behavior of little penguins compared to short-term anthropause events. Our long-term dataset was key to test whether changes in anthropogenic activities affected the wildlife during the COVID-19 pandemic. We found that marine traffic, but not tourist presence, negatively impact the foraging and provisioning behavior of little penguins.
Publisher: Springer Science and Business Media LLC
Date: 12-01-2007
Publisher: Inter-Research Science Center
Date: 29-08-2008
DOI: 10.3354/MEPS07507
Publisher: Springer Science and Business Media LLC
Date: 05-04-2021
No related grants have been discovered for Akiko Kato.