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Journal |
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Year |
2021 |
Publication |
Ecological Monographs |
Abbreviated Journal |
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Volume |
91 |
Issue |
3 |
Pages |
e01459 |
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Programme  |
109 |
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Thesis |
Bachelor's thesis |
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ISSN |
1557-7015 |
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yes |
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Call Number |
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Serial |
8210 |
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Author |
N. Ribeiro, L. Herraiz-Borreguero, S. R. Rintoul, C. R. McMahon, M. Hindell, R. Harcourt, G. Williams |
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Title |
Warm Modified Circumpolar Deep Water Intrusions Drive Ice Shelf Melt and Inhibit Dense Shelf Water Formation in Vincennes Bay, East Antarctica |
Type |
Journal |
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Year |
2021 |
Publication |
Journal of Geophysical Research: Oceans |
Abbreviated Journal |
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Volume |
126 |
Issue |
8 |
Pages |
e2020JC016998 |
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Keywords |
AABW Antarctic Coastal Circulation Antarctic Margins basal melt mCDW intrusions seal CTD |
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109 |
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ISSN |
2169-9291 |
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Approved |
yes |
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Call Number |
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Serial |
8211 |
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Author |
Samantha C. Patrick, Julien G. A. Martin, Caroline C. Ummenhofer, Alexandre Corbeau, Henri Weimerskirch |
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Title |
Albatrosses respond adaptively to climate variability by changing variance in a foraging trait |
Type |
Journal |
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Year |
2021 |
Publication |
Global Change Biology |
Abbreviated Journal |
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Volume |
27 |
Issue |
19 |
Pages |
4564-4574 |
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Keywords |
bet-hedging intra-individual variability resource acquisition salt-water immersion logger seabirds Southern Oscillation Index |
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Abstract |
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Programme |
109 |
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ISSN |
1365-2486 |
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Approved |
yes |
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Call Number |
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Serial |
8257 |
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Title |
Untangling local and remote influences in two major petrel habitats in the oligotrophic Southern Ocean |
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Journal |
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Year |
2021 |
Publication |
Global Change Biology |
Abbreviated Journal |
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Volume |
27 |
Issue |
22 |
Pages |
5773-5785 |
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Keywords |
Antarctic Circumpolar Current (ACC) biogeography conservation grey petrels high seas hotspot open ocean primary productivity Procellaria cinerea seabirds |
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Abstract |
Ocean circulation connects geographically distinct ecosystems across a wide range of spatial and temporal scales via exchanges of physical and biogeochemical properties. Remote oceanographic processes can be especially important for ecosystems in the Southern Ocean, where the Antarctic Circumpolar Current transports properties across ocean basins through both advection and mixing. Recent tracking studies have indicated the existence of two large-scale, open ocean habitats in the Southern Ocean used by grey petrels (Procellaria cinerea) from two populations (i.e., Kerguelen and Antipodes islands) during their nonbreeding season for extended periods during austral summer (i.e., October to February). In this work, we use a novel combination of large-scale oceanographic observations, surface drifter data, satellite-derived primary productivity, numerical adjoint sensitivity experiments, and output from a biogeochemical state estimate to examine local and remote influences on these grey petrel habitats. Our aim is to understand the oceanographic features that control these isolated foraging areas and to evaluate their ecological value as oligotrophic open ocean habitats. We estimate the minimum local primary productivity required to support these populations to be much <1% of the estimated local primary productivity. The region in the southeast Indian Ocean used by the birds from Kerguelen is connected by circulation to the productive Kerguelen shelf. In contrast, the region in the south-central Pacific Ocean used by seabirds from the Antipodes is relatively isolated suggesting it is more influenced by local factors or the cumulative effects of many seasonal cycles. This work exemplifies the potential use of predator distributions and oceanographic data to highlight areas of the open ocean that may be more dynamic and productive than previously thought. Our results highlight the need to consider advective connections between ecosystems in the Southern Ocean and to re-evaluate the ecological relevance of oligotrophic Southern Ocean regions from a conservation perspective. |
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Programme |
109 |
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ISSN |
1365-2486 |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
8258 |
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Title |
Fishing behaviours and fisher effect in decision-making processes when facing depredation by marine predators |
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Journal |
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Year |
2021 |
Publication |
Fisheries Management and Ecology |
Abbreviated Journal |
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Volume |
28 |
Issue |
6 |
Pages |
528-541 |
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Keywords |
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Abstract |
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Programme |
109 |
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Edition |
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ISSN |
1365-2400 |
ISBN |
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Approved |
yes |
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Call Number |
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Serial |
8307 |
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Author |
Stephanie Jenouvrier, Judy Che-Castaldo, Shaye Wolf, Marika Holland, Sara Labrousse, Michelle LaRue, Barbara Wienecke, Peter Fretwell, Christophe Barbraud, Noah Greenwald, Julienne Stroeve, Philip N. Trathan |
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Title |
The call of the emperor penguin: Legal responses to species threatened by climate change |
Type |
Journal |
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Year |
2021 |
Publication |
Global Change Biology |
Abbreviated Journal |
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Volume |
27 |
Issue |
20 |
Pages |
5008-5029 |
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Keywords |
climate risk assessments Endangered Species Act foreseeable future population projections redundancy and representation (3Rs) resiliency sea ice projections species distribution treatment of scientific uncertainty |
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Abstract |
Species extinction risk is accelerating due to anthropogenic climate change, making it urgent to protect vulnerable species through legal frameworks in order to facilitate conservation actions that help mitigate risk. Here, we discuss fundamental concepts for assessing climate change risks to species using the example of the emperor penguin (Aptenodytes forsteri), currently being considered for protection under the US Endangered Species Act (ESA). This species forms colonies on Antarctic sea ice, which is projected to significantly decline due to ongoing greenhouse gas (GHG) emissions. We project the dynamics of all known emperor penguin colonies under different GHG emission scenarios using a climate-dependent meta-population model including the effects of extreme climate events based on the observational satellite record of colonies. Assessments for listing species under the ESA require information about how species resiliency, redundancy and representation (3Rs) will be affected by threats within the foreseeable future. Our results show that if sea ice declines at the rate projected by climate models under current energy system trends and policies, the 3Rs would be dramatically reduced and almost all colonies would become quasi-extinct by 2100. We conclude that the species should be listed as threatened under the ESA. |
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Programme |
109 |
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ISSN |
1365-2486 |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
8308 |
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Author |
Fabrice Genevois, Christophe Barbraud |
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Journal |
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Year |
2021 |
Publication |
Polar Biology |
Abbreviated Journal |
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Volume |
44 |
Issue |
1 |
Pages |
217-219 |
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Keywords |
Antarctic Interspecific feeding Penguin |
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Programme |
109 |
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ISSN |
1432-2056 |
ISBN |
1432-2056 |
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Approved |
yes |
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Call Number |
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Serial |
8324 |
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Title |
Contribution of toothfish depredated on fishing lines to the energy intake of killer whales off the Crozet Islands: a multi-scale bioenergetic approach |
Type |
Journal |
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Year |
2021 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
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Volume |
668 |
Issue |
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Pages |
149-161 |
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Keywords |
Bioenergetic model Depredation Dissostichus eleginoides Ecosystem-based management Fisheries interaction Marine mammals Orcinus orca Top predator conservation |
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Abstract |
Fisheries modify prey availability for marine predators by extracting resources but also by providing them with new feeding opportunities. Among these, depredation, which occurs when predators feed on fish caught on fishing gear, is a behavior developed by many species as a way to acquire food through limited foraging effort. However, the extent to which depredated resources from fisheries contribute to the energetic requirements and affect the demography of depredating individuals is unknown. We investigated the contribution of Patagonian toothfish Dissostichus eleginoides depredated on longlines to the energetic requirements of killer whales Orcinus orca around the Crozet Islands (southern Indian Ocean) over the period 2007-2018. Our results indicate that during days when depredation occurred, depredating individuals fulfilled on average 94.1% of their daily energetic requirements with depredated toothfish. However, the contribution varied from 1.2 to 13.3% of the monthly energetic requirements and from 2.4 to 8.8% of the yearly energetic requirements of the total population. Together, these findings suggest that intake of depredated toothfish can be substantial at a fine scale (daily and individually), potentially leading to temporary provisioning effects and changes in predation pressures. These effects become minor (<10%), however, when considering the full population over a whole year. The contribution of depredated fish to the annual energetic requirements of the population has increased in recent years, likely due to larger fishing quotas and greater opportunities for whales to depredate, which stresses the importance of accounting for depredation in ecosystem-based management of fishing activity. |
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Programme |
109 |
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ISSN |
0171-8630, 1616-1599 |
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yes |
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Call Number |
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Serial |
8335 |
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Author |
Pamela E. Michael, Chris Wilcox, Christophe Barbraud, Karine Delord, Michael Sumner, Henri Weimerskirch |
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Title |
Dynamic enforcement of bycatch via reproductive value can increase theoretical efficiency |
Type |
Journal |
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Year |
2021 |
Publication |
Marine Policy |
Abbreviated Journal |
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Volume |
132 |
Issue |
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Pages |
104684 |
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Keywords |
Albatross Bycatch Dynamic enforcement Dynamic ocean management Monitoring Reproductive value |
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Abstract |
Managing marine systems is challenging, as many marine species are highly mobile. Albatross exemplify this paradigm, overlapping multiple threats at sea, including bycatch. The typical characterization of bycatch, the number of individuals, ignores the long-term, population-wide repercussions of bycatch. Including an estimate of the reproductive value (RV, the loss of future reproductive contributions, given bycatch) is a complementary tool, incorporating the population-wide repercussions of bycatch. While bycatch management via dynamic spatial management allows management boundaries to move, it requires monitoring and enforcement to be effective. We provide a proof of concept to optimize bycatch enforcement activities by dynamically targeting areas of concentrated future productivity characterized by RV. This paper examined a population of black-browed albatross (Thalassarche melanophris) as a case study. We calculate RV and apply it to at-sea distributions. This creates spatiotemporally explicit surfaces used to prioritize times and locations for bycatch mitigation enforcement. Dynamic enforcement has greater theoretical efficiency than static enforcement, but this difference decreases with increasing population-wide RV subject to enforcement. Though there are implementation challenges, many can be reduced with existing tools providing various opportunities. Incorporating RV when characterizing the impacts of bycatch on a population and strategically applying dynamic bycatch enforcement based on RV can be a powerful, efficient component of dynamic ocean management. |
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Programme |
109 |
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ISSN |
0308-597X |
ISBN |
0308-597X |
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Approved |
yes |
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Call Number |
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Serial |
8342 |
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Author |
Lara D. Shepherd, Colin M. Miskelly, Yves Cherel, Alan J. D. Tennyson |
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Title |
Genetic identification informs on the distributions of vagrant Royal (Eudyptes schlegeli) and Macaroni (Eudyptes chrysolophus) Penguins |
Type |
Journal |
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Year |
2021 |
Publication |
Polar Biology |
Abbreviated Journal |
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Volume |
44 |
Issue |
12 |
Pages |
2299-2306 |
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Keywords |
Antarctica Eudyptes chrysolophus Eudyptes schlegeli Genetic identification Penguin distribution Predation |
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Abstract |
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Programme |
109 |
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Edition |
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ISSN |
1432-2056 |
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yes |
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Call Number |
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Serial |
8365 |
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