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Title |
Seabird population changes following mammal eradication at oceanic Saint-Paul Island, Indian Ocean |
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Journal |
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Year |
2021 |
Publication |
Journal for Nature Conservation |
Abbreviated Journal |
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Volume |
63 |
Issue |
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Pages |
126049 |
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Keywords |
Island restoration Petrels Population growth rate Rats Shearwaters Terns |
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109 |
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1617-1381 |
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yes |
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Serial |
8459 |
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Author |
Christophe Sauser, Karine Delord, Christophe Barbraud |
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Title |
Demographic sensitivity to environmental forcings: a multi-trait, multi-colony approach |
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Journal |
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Year |
2021 |
Publication |
Oikos |
Abbreviated Journal |
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Volume |
130 |
Issue |
6 |
Pages |
943-957 |
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109 |
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ISSN |
1600-0706 |
ISBN |
1600-0706 |
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yes |
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8039 |
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Title |
Huff and puff and blow down: invasive plants traits response to strong winds at the Southern Oceanic Islands |
Type |
Journal |
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Year |
2021 |
Publication |
Oikos |
Abbreviated Journal |
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Volume |
130 |
Issue |
11 |
Pages |
1919-1929 |
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Keywords |
environmental filter functional traits hypervolume Iles Kerguelen intraspecific variability mechanical stress |
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Abstract |
Invasions constitute a major driver of biodiversity changes. Insular plant communities are particularly vulnerable to invasions and are relevant models for investigating mechanisms supporting the establishment and spread of introduced plants. Terrestrial flora of sub-Antarctic islands must often thrive in highly windy habitats, thus imposing strong mechanical constraints on individuals. Many alien plants at the sub-Antarctic islands are of tropical or temperate origins, where they were exposed to less stringent wind conditions. As wind likely represents a strong environmental filter for the successful establishment and further geographic spread of plants, they should have developed responses to resist and successfully colonize the Iles Kerguelen. We studied responses to wind of three herbaceous species that are invasive at Iles Kerguelen. We sampled plant individuals at different locations, under windy and sheltered conditions. Traits related to wind avoidance and tolerance and to resource acquisition were measured. We additionally assessed individual performance (biomass) to determine the consequences of trait variations. We focused on trait mean and variance, in particular, through the calculation of hypervolumes. This study emphasized that wind has important effects on plant economics spectrum, including traits involved in mechanical avoidance and light acquisition, with varying strategies, which seem to depend on the biological type of the species (grass versus non-grass). Wind generally reduces individual performance, and this negative effect is not direct but operates through the modification of plant trait values. Furthermore, analyses performed at the hypervolume scale indicate that not only functional trait mean but also its variability account for plant performance. The existence of contrasting growth strategies to cope with local environmental conditions suggests that invaders will be able to occupy different niches, which may ultimately impact local communities. Our results highlight the importance of considering multi-traits responses to meaningfully capture plant adjustments to stress. |
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136 |
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1600-0706 |
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yes |
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Call Number |
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Serial |
8372 |
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Author |
Casey Youngflesh, Yun Li, Heather J. Lynch, Karine Delord, Christophe Barbraud, Rubao Ji, Stephanie Jenouvrier |
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Title |
Lack of synchronized breeding success in a seabird community: extreme events, niche separation, and environmental variability |
Type |
Journal |
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Year |
2021 |
Publication |
Oikos |
Abbreviated Journal |
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Volume |
130 |
Issue |
11 |
Pages |
1943-1953 |
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Keywords |
Antarctica environmental indicators extreme events global change niche separation synchrony |
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Abstract |
Synchrony in ecological systems, the degree to which elements respond similarly over time or space, can inform our understanding of how ecosystems function and how they are responding to global change. While studies of ecological synchrony are often focused on within-species dynamics, synchrony among species may provide important insights into how dynamics of one species are indicative of conditions relevant to the larger community, with both basic and applied implications. Ecological theory suggests there may be conditions under which communities might exhibit increased synchrony, however, the degree to which these patterns are borne out in natural systems is currently unknown. We used long-term breeding success data from a community of Antarctic seabirds to assess the degree of interspecific, community synchrony, and the role that extreme events play in driving these dynamics. We assessed theoretical links between community synchrony, niche separation, and environmental variability using data from this and three other seabird communities as well as a simulation study. Results show that reproductive success for individual species in the Antarctic seabird community fluctuated relatively independently from one another, resulting in little synchrony across this community, outside of extreme years. While an exceptionally poor year for a given species was not necessarily associated with an exceptionally poor year for any other species, one community-wide extreme year existed. When compared to other seabird communities, this group of Antarctic seabirds exhibited lower overall synchrony and higher estimated niche separation, supporting theoretical predictions. Empirical and simulation-derived results suggest that communities where temporal variation is small for conditions in which species respond substantially differently, and large for conditions in which species respond similarly, may exhibit more synchronous dynamics. Identifying where and why synchronous dynamics might be more apparent has the potential to inform how ecological communities might respond to future global change. |
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109 |
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1600-0706 |
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yes |
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Call Number |
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Serial |
8385 |
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Title |
Diel at-sea activity of two species of great albatrosses: the ontogeny of foraging and movement behaviour |
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Journal |
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Year |
2021 |
Publication |
Journal of Avian Biology |
Abbreviated Journal |
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Volume |
52 |
Issue |
2 |
Pages |
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Keywords |
albatross diel activity pattern Diomedea flight behavior foraging activity moon illumination night activity seabirds |
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Abstract |
The first year of life is a period of high mortality in animals. Reduced foraging capacities of naive individuals might be the primary cause of their mortality. These capacities are supposed to be progressively acquired during the first months of life. In this study, we investigate the ontogeny of flight capacities, by day and night, of first-year individuals, and compare it with adults from two closely related species of great albatrosses: Amsterdam Diomedea amsterdamensis and wandering Diomedea exulans albatrosses which forage in different environmental conditions. We used 71 tracks of 71 juvenile birds and 141 of 116 incubating adults to compare both age categories. In order to explore the effect of moon light on night activity, we elaborated a new formula which improves the precision of the proxy of moon illumination. By day, we found that juveniles of both species reach some adult foraging capacities in less than two months. By night, albatrosses have reduced activity increasing during the first weeks at sea for juveniles and changing in accordance with moon illumination for both juveniles and adults. A peak of flight activity at dawn and dusk was apparent for both species. Interspecific comparison underlined that Amsterdam albatrosses were more active than wandering albatrosses, suggesting a difference in food and foraging strategy. Overall, we highlighted how life history traits, environmental conditions and time of the day affect the foraging activity of two related species of seabirds. |
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Programme |
109 |
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ISSN |
1600-048X |
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Approved |
yes |
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Call Number |
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Serial |
7943 |
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Author |
Anika Immer, Thomas Merkling, Olivier Chastel, Scott A. Hatch, Etienne Danchin, Pierrick Blanchard, Sarah Leclaire |
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Title |
Spying on your neighbours? Social information affects timing of breeding and stress hormone levels in a colonial seabird |
Type |
Journal |
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Year |
2021 |
Publication |
Evolutionary Ecology |
Abbreviated Journal |
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Volume |
35 |
Issue |
3 |
Pages |
463-481 |
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Keywords |
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Abstract |
A good overlap between offspring energetic requirements and availability of resources is required for successful reproduction. Accordingly, individuals from numerous species fine-tune their timing of breeding by integrating cues that predict environmental conditions during the offspring period. Besides acquiring information from their direct interaction with the environment (personal information), individuals can integrate information by observing the behaviours or performance of others (social information). The use of social information is often beneficial because the accumulated knowledge of conspecifics may represent a source of information more reliable than the intrinsically more limited personal information. However, although social information constitutes the major source of information in a wide range of contexts, studies investigating its use in the context of timing of breeding are scarce. We investigated whether black-legged kittiwakes (Rissa tridactyla) used social information to adjust the timing of egg-laying. We manipulated social information using a food-supplementation experiment, known to advance kittiwakes' reproductive phenology. We expected food-supplemented and unsupplemented pairs to delay and advance, respectively, their timing of laying when surrounded by a majority of neighbours from the opposite food-treatment. However, both unsupplemented and food-supplemented kittiwakes delayed egg-laying when surrounded by a higher proportion of neighbours from the opposite food-treatment. This result shows that kittiwakes use social information to time egg-laying, but that it is not used to match the seasonal peak of food availability. We suggest that when social and personal cues give contradictory environmental information, individuals may benefit from delaying laying to gather more information to make better decisions about investment into eggs. Further, we explored a potential proximate mechanism for the pattern we report. We show that baseline corticosterone, known to mediate reproductive decisions, was lower in unsupplemented females facing a higher proportion of food-supplemented neighbours. Altogether, our results suggest that to fine-tune their timing of laying, kittiwakes use complex decision-making processes in which social and personal information interplay. |
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1162 |
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ISSN |
1573-8477 |
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1573-8477 |
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yes |
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Call Number |
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Serial |
8245 |
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Title |
Predation by feral cats threatens great albatrosses |
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Journal |
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Year |
2021 |
Publication |
Biological Invasions |
Abbreviated Journal |
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Volume |
23 |
Issue |
8 |
Pages |
2389-2405 |
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109 |
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ISSN |
1573-1464 |
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yes |
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Call Number |
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Serial |
7938 |
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Author |
Danish A. Ahmed, Emma J. Hudgins, Ross N. Cuthbert, Phillip J. Haubrock, David Renault, Elsa Bonnaud, Christophe Diagne, Franck Courchamp |
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Title |
Modelling the damage costs of invasive alien species |
Type |
Journal |
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Year |
2021 |
Publication |
Biological Invasions |
Abbreviated Journal |
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136 |
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ISSN |
1573-1464 |
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yes |
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Call Number |
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Serial |
8090 |
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Title |
An assessment of the endemic spermatophytes, pteridophytes and bryophytes of the French Overseas Territories: towards a better conservation outlook |
Type |
Journal |
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Year |
2021 |
Publication |
Biodiversity and conservation |
Abbreviated Journal |
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Volume |
30 |
Issue |
7 |
Pages |
2097-2124 |
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136 |
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ISSN |
1572-9710 |
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Approved |
yes |
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Call Number |
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Serial |
7976 |
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Journal |
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Year |
2021 |
Publication |
Natural Hazards and Earth System Sciences Discussions |
Abbreviated Journal |
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Volume |
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Pages |
1-25 |
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133 |
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ISSN |
1561-8633 |
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yes |
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Call Number |
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Serial |
8019 |
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