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Yves Cherel, Pierrick Bocher |
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Title |
Diet of the soft-plumaged petrel (Pterodroma mollis) at Kerguelen Islands and a review of the food of gadfly petrels (Pterodroma spp.) worldwide |
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Year |
2022 |
Publication |
Marine Biology |
Abbreviated Journal |
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Volume |
169 |
Issue |
2 |
Pages |
31 |
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Keywords |
Fish Food Myctophidae Procellariiformes Seabirds Southern Ocean Squid Tropics |
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Abstract |
Little is known on the food and feeding ecology of the soft-plumaged petrel Pterodroma mollis, which is the single gadfly petrel Pterodroma spp. with a circumpolar breeding distribution within the Southern Ocean. Our primary goal was to describe its diet at Kerguelen Islands, which is the southernmost breeding locality of the species. Soft-plumaged petrels fed on fish (71% by mass), and secondarily on crustaceans (22%), while cephalopods (7%) and other items (< 1%) were minor dietary components. Eight-hundred and sixty prey were identified from the pooled 33 food samples, with the 2 hyperiid amphipods Cyllopus magellanicus (48%) and Themisto gaudichaudii (35%) being the main food items by number. Owing to their larger size than crustaceans, mesopelagic fishes were the main prey by mass, with myctophids being the most important fish family in terms of both abundance (68% of the fish) and diversity (10 species). Prey distribution indicated that soft-plumaged petrels foraged primarily in oceanic subantarctic waters to feed their chicks. The oceanic life style of gadfly petrels was then highlighted by a review of their diet worldwide (20 species, 26 studies). Gadfly petrels prey mainly upon mesopelagic fishes (chiefly myctophids) and squids with their relative proportions depending on species and localities. Crustaceans are minor food items for tropical species, but they form a significant part of the food of the small- and medium-sized petrels that live in temperate and cold waters. The review underlines the need for more well-designed investigations on this globally endangered group of seabirds, since dietary information is available for only 57% of the 35 species of gadfly petrels. |
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1432-1793 |
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8340 |
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Charles Cantoni |
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Title |
Effect of thermal stress on the reproductive success and on the physiology of Anatalanta aptera. |
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Master 1 |
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2022 |
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Rapport de stage de master 1, université de rennes 1 (encadrement : e. daly) |
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136 |
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8343 |
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Camille Lemonnier, Pierre Bize, Rudy Boonstra, F. Stephen Dobson, François Criscuolo, Vincent A. Viblanc |
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Title |
Effects of the social environment on vertebrate fitness and health in nature: Moving beyond the stress axis |
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Year |
2022 |
Publication |
Hormones and Behavior |
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145 |
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105232 |
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Dominance Epigenetics Hierarchies HPA Social buffers Social determinants of health |
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Social interactions are a ubiquitous feature of the lives of vertebrate species. These may be cooperative or competitive, and shape the dynamics of social systems, with profound effects on individual behavior, physiology, fitness, and health. On one hand, a wealth of studies on humans, laboratory animal models, and captive species have focused on understanding the relationships between social interactions and individual health within the context of disease and pathology. On the other, ecological studies are attempting an understanding of how social interactions shape individual phenotypes in the wild, and the consequences this entails in terms of adaptation. Whereas numerous studies in wild vertebrates have focused on the relationships between social environments and the stress axis, much remains to be done in understanding how socially-related activation of the stress axis coordinates other key physiological functions related to health. Here, we review the state of our current knowledge on the effects that social interactions may have on other markers of vertebrate fitness and health. Building upon complementary findings from the biomedical and ecological fields, we identify 6 key physiological functions (cellular metabolism, oxidative stress, cellular senescence, immunity, brain function, and the regulation of biological rhythms) which are intimately related to the stress axis, and likely directly affected by social interactions. Our goal is a holistic understanding of how social environments affect vertebrate fitness and health in the wild. Whereas both social interactions and social environments are recognized as important sources of phenotypic variation, their consequences on vertebrate fitness, and the adaptive nature of social-stress-induced phenotypes, remain unclear. Social flexibility, or the ability of an animal to change its social behavior with resulting changes in social systems in response to fluctuating environments, has emerged as a critical underlying factor that may buffer the beneficial and detrimental effects of social environments on vertebrate fitness and health. |
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0018-506X |
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yes |
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8344 |
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Author |
Guillaume Gall |
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Title |
Elaboration de la typologie des habitats de l'île de la Possession (Archipel Crozet) |
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Master 2 |
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Year |
2022 |
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Rapport de stage de master 2, université de bretagne occidentale (encadrement : p. agnola, d. renault) |
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136 |
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8345 |
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Author |
Thomas Guiguitant |
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Title |
Etude des stratégies de vie d’espèces de macrophyte (Limosella australis) de l’archipel des Kerguelen |
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Master 1 |
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Year |
2022 |
Publication |
Master 1 Bee, université Lyon 1 (encadrement : A.-K. Bittebiere) |
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136 |
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yes |
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8349 |
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Author |
Laure-Anne Valfré |
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Title |
Etude des stratégies de vie d’espèces de macrophytes de l’archipel des Iles Kerguelen |
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Master 1 |
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2022 |
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Master 1 Bee, université Lyon 1 (encadrement : A.-K. Bittebiere) |
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136 |
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8350 |
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Jacques Labonne, Mathieu Buoro, Lucie Aulus Giacosa, Matthias Vignon, Sindre Håvarstein Eldøy, Jan Grimsrud Davidsen, Xavier Bordeleau, Sophia Ferchiou, France Caza, Yves St-Pierre, Stephane Betoulle, Jean-Christophe Aymes, Francois Gueraud, Andrew P. Hendry, Lucie Marandel, Stéphane Glise, Alexandre Herman, Vincent Veron, Stéphane Panserat, Philippe Gaudin |
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Title |
Evolutionary Ecology of Kerguelen Islands Colonization by Introduced Salmonids: SALMEVOL 1041-2 project |
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Book |
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2022 |
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Rapport |
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The present report is a synthesis of all studies conducted around the long-term ecological research (LTER) monitoring of introduced salmonid species in the sub Antarctic Kerguelen islands over the 2015- 2020 period, within the SALMEVOL-2 project. The monitoring encompasses the history of eight species, five of which are still present in Kerguelen, the data and collections spanning five decades and tenths of rivers. Based on this monitoring, but also thanks to various field experiments, we have undertaken to study the evolutionary ecology of these species, using the invasive Brown trout as flagship model, under the premise that the Kerguelen situation, where rivers were previously void of any fish species, could be an anticipation lab of the situation developing at the poles due to climate change. Our findings pertain to life history traits such as individual growth, migration between freshwater and marine ecosystems, microbiomes, but also proximal and ultimate mechanisms of adaptation in relation to the local environment. We also begin to investigate how the expanding metapopulation structure, resulting from multiple invasion events, may affect life history traits evolution. |
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1041 |
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8358 |
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Author |
Karine Delord, Timothée Poupart, Nicolas Gasco, Henri Weimerskirch, Christophe Barbraud |
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Title |
First evidence of migration across the South Pacific in endangered Amsterdam albatross and conservation implications |
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2022 |
Publication |
Marine Policy |
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136 |
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Pages |
104921 |
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Keywords |
Immature at sea distribution International conservation responsibility Juvenile dispersal National Plan of Actions |
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Albatrosses are amongst the most globally-threatened species and fisheries bycatch is one of the major conservation issues worldwide. Among the albatrosses the Amsterdam albatross is listed as one of the most endangered species. Within the current National Plan of Actions framework, the present study outlines the first results of a multi-year survey evaluating juvenile dispersal and immature at sea distribution using geolocation and conservation implications. Here we report the first evidence of an Amsterdam albatross wandering for extensive periods outside the Indian Ocean, in the Pacific Ocean. This unprecedented and novel finding is discussed in terms of overlaps with fisheries and conservations issues. This study brings new insights on movements of vagrant stages of an endangered species, paving the way for refined assessments updates of species vulnerability to ongoing anthropogenic threats while providing basic conservation guidance. This makes it possible to point out the responsibility of the various management bodies both for the high seas regional fisheries management organisations and for exclusive economic zones. |
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109 |
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0308-597X |
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8362 |
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Jiadong Zhong, Matej Medvecky, Jérémy Tornos, Augustin Clessin, Hubert Gantelet, Amandine Gamble, Taya L. Forde, Thierry Boulinier |
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Title |
Genomic characterisation of a novel species of Erysipelothrix associated with mortalities among endangered seabirds |
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2022 |
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Biorxive |
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Infectious diseases threaten endangered species, particularly in small isolated populations. Seabird populations on the remote Amsterdam Island in the Indian Ocean have been in decline for the past three decades, with avian cholera caused by Pasteurella multocida proposed as the primary driver. However, Erysipelothrix spp. has also been sporadically detected from albatrosses on Amsterdam Island and may be contributing to some of the observed mortality. In this study, we genomically characterised 16 Erysipelothrix spp. isolates obtained from three Indian yellow-nosed albatross chick carcasses in 2019. Two isolates were sequenced using both Illumina short-read and MinION long-read approaches, which – following hybrid assembly – resulted in closed circular genomes. Mapping of Illumina reads from the remaining isolates to one of these new reference genomes revealed that all 16 isolates were closely related, with a maximum of 13 nucleotide differences distinguishing any pair of isolates. The nucleotide diversity of isolates obtained from the same or different carcasses was similar, suggesting all three chicks were likely infected from a common source. These genomes were compared with a global collection of genomes from E. rhusiopathiae and other species from the same genus. The isolates from albatrosses were phylogenetically distinct, sharing a most recent common ancestor with E. rhusiopathiae. Based on phylogenomic analysis and standard thresholds for average nucleotide identity and digital DNA-DNA hybridisation, these isolates represent a novel Erysipelothrix species, for which we propose the name Erysipelothrix amsterdamensis sp. nov. The type strain is E. amsterdamensis A18Y020dT. The implications of this bacterium for albatross conservation will require further study. |
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1151 |
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8366 |
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Theresa L. Cole, Chengran Zhou, Miaoquan Fang, Hailin Pan, Daniel T. Ksepka, Steven R. Fiddaman, Christopher A. Emerling, Daniel B. Thomas, Xupeng Bi, Qi Fang, Martin R. Ellegaard, Shaohong Feng, Adrian L. Smith, Tracy A. Heath, Alan J. D. Tennyson, Pablo García Borboroglu, Jamie R. Wood, Peter W. Hadden, Stefanie Grosser, Charles-André Bost, Yves Cherel, Thomas Mattern, Tom Hart, Mikkel-Holger S. Sinding, Lara D. Shepherd, Richard A. Phillips, Petra Quillfeldt, Juan F. Masello, Juan L. Bouzat, Peter G. Ryan, David R. Thompson, Ursula Ellenberg, Peter Dann, Gary Miller, P. Dee Boersma, Ruoping Zhao, M. Thomas P. Gilbert, Huanming Yang, De-Xing Zhang, Guojie Zhang |
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Title |
Genomic insights into the secondary aquatic transition of penguins |
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2022 |
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Nature Communications |
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13 |
Issue |
1 |
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3912 |
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Biodiversity Evolutionary genetics Zoology |
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Abstract |
Penguins lost the ability to fly more than 60 million years ago, subsequently evolving a hyper-specialized marine body plan. Within the framework of a genome-scale, fossil-inclusive phylogeny, we identify key geological events that shaped penguin diversification and genomic signatures consistent with widespread refugia/recolonization during major climate oscillations. We further identify a suite of genes potentially underpinning adaptations related to thermoregulation, oxygenation, diving, vision, diet, immunity and body size, which might have facilitated their remarkable secondary transition to an aquatic ecology. Our analyses indicate that penguins and their sister group (Procellariiformes) have the lowest evolutionary rates yet detected in birds. Together, these findings help improve our understanding of how penguins have transitioned to the marine environment, successfully colonizing some of the most extreme environments on Earth. |
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2041-1723 |
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2041-1723 |
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8367 |
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