30 Works

Data from: Structure of the rare archaeal biosphere and seasonal dynamics of active ecotypes in surface coastal waters

Najwa Taib, Mylène Hugoni, Didier Debroas, Isabelle Domaizon, Isabelle Jouan-Dufournel, Gisèle Bronner, Ian Salter, Hélène Agogué, Isabelle Mary & Pierre E. Galand
Marine Archaea are important players among microbial plankton and significantly contribute to biogeochemical cycles, but details regarding their community structure and long-term seasonal activity and dynamics remain largely unexplored. In this study, we monitored the inter-annual archaeal community composition of abundant and rare biospheres in northwestern Mediterranean Sea surface waters by pyrosequencing 16S rDNA and rRNA. A detailed analysis of the rare biosphere structure showed that the rare archaeal community was composed of three distinct...

Data from: A global perspective on the trophic geography of sharks

Christopher Stephen Bird, Ana Veríssimo, Sarah Magozzi, Kátya G. Abrantes, Alex Aguilar, Hassan Al-Reasi, Adam Barnett, Dana M. Bethea, Gérard Biais, Asuncion Borrell, Marc Bouchoucha, Mariah Boyle, Edward J. Brooks, Juerg Brunnschweiler, Paco Bustamante, Aaron Carlisle, Diana Catarino, Stéphane Caut, Yves Cherel, Tiphaine Chouvelon, Diana Churchill, Javier Ciancio, Julien Claes, Ana Colaço, Dean L. Courtney … & Clive N. Trueman
Sharks are a diverse group of mobile predators that forage across varied spatial scales and have the potential to influence food web dynamics. The ecological consequences of recent declines in shark biomass may extend across broader geographic ranges if shark taxa display common behavioural traits. By tracking the original site of photosynthetic fixation of carbon atoms that were ultimately assimilated into muscle tissues of 5,394 sharks from 114 species, we identify globally consistent biogeographic traits...

Do human infrastructures shape nest distribution in the landscape depending on individual personality in a farmland bird of prey?

Juliette Rabdeau, Beatriz Arroyo, Francois Mougeot, Isabelle Badenhausser, Vincent Bretagnolle & Karine Monceau
1. Individuals´ distribution across habitats may depend on their personality. Human activities and infrastructures are critical elements of the landscape that may impact the habitat selection process. However, depending on their personality, individuals may respond differently to these unnatural elements. 2. In the present study, we first investigated whether some human infrastructures (buildings, roads and paths) shaped Montagu’s harrier nest spatial distribution in the landscape according to female personality (boldness). Second, we tested if the...

Bird migration in space and time: chain migration by Eurasian curlew (Numenius arquata arquata) along the East Atlantic Flyway

Rebecca Pederson, Pierrick Bocher, Stefan Garthe, Jérôme Fort, Moritz Mercker, Verena Auernhammer, Martin Boschert, Philippe Delaporte, Jaanus Elts, Wolfgang Fiedler, Michał Korniluk, Dominik Krupiński, Riho Marja, Pierre Rousseau, Lukas Thiess & Philipp Schwemmer
Migration patterns in birds vary in space and time. Spatial patterns include chain, leap frog, and telescopic migration. Temporal patterns such as migration duration, number and duration of stopovers may vary according to breeding latitude, sex and season. This study aimed to verify these patterns in a long-distance migrant, the Eurasian curlew (Numenius arquata arquata), and to provide a synopsis of spatio-temporal migration patterns in this species of concern throughout the East Atlantic Flyway. We...

La transition de 1978 en Bolivie (Les Études du CERI, n° 239-240)

Sebastián Urioste
La rapidité étonnante avec laquelle les grèves de la faim de 1978 accélérèrent la fin de la dictature militaire de Hugo Banzer et amorcèrent la transition démocratique en Bolivie requiert d’être analysée à l’aune du caractère à la fois autoritaire et précaire de son gouvernement.

Data from: Assessing cetacean surveys throughout the Mediterranean Sea: a gap analysis in environmental space

Laura Mannocci, Jason J. Roberts, Patrick N. Halpin, Matthieu Authier, Olivier Boisseau, Mohamed Nejmeddine Bradai, Ana Cañadas, Carla Chicote, Léa David, Nathalie Di-Méglio, Caterina M. Fortuna, Alexandros Frantzis, Manel Gazo, Tilen Genov, Philip S. Hammond, Drasko Holcer, Kristin Kaschner, Dani Kerem, Giancarlo Lauriano, Tim Lewis, Giuseppe Notarbartolo Di Sciara, Simone Panigada, Juan Antonio Raga, Aviad Scheinin, Vincent Ridoux … & Joseph Vella
Heterogeneous data collection in the marine environment has led to large gaps in our knowledge of marine species distributions. To fill these gaps, models calibrated on existing data may be used to predict species distributions in unsampled areas, given that available data are sufficiently representative. Our objective was to evaluate the feasibility of mapping cetacean densities across the entire Mediterranean Sea using models calibrated on available survey data and various environmental covariates. We aggregated 302,481...

Data from: A comparative analysis of the behavioral response to fishing boats in two albatross species

Julien Collet, Samantha C. Patrick & Henri Weimerskirch
Anthropogenic food resources have significantly modified the foraging behavior of many animal species. They enhance large multi-specific aggregations of individuals, with strong ecological consequences. It is challenging to predict how individuals or species can differ in their reaction to these resources. For instance, there are wide variations in seabird species abundance behind fishing boats, and individual variations in interaction rates. Whether this is reflecting variations in fine-scale encounter rates or rather variations in attraction strength...

Data from: Herbivore effect traits and their impact on plant community biomass: an experimental test using grasshoppers

Hélène Deraison, Isabelle Badenhausser, Luca Börger & Nicolas Gross
1. Using trait-based approaches to study trophic interactions may represent one of the most promising approaches to evaluate the impact of trophic interactions on ecosystem functioning. To achieve this goal, it is necessary to clearly identify which traits determine the impact of one trophic level on another. 2. Using functionally contrasting grasshopper species, we tested the ability of multiple traits (morphological, chemical and biomechanical) to predict herbivore impact on the biomass of a diverse plant...

Data from: Flight paths of seabirds soaring over the ocean surface enable measurement of fine-scale wind speed and direction

Yoshinari Yonehara, Yusuke Goto, Ken Yoda, Yutaka Watanuki, Lindsay C. Young, Henri Weimerskirch, Charles-André Bost & Katsufumi Sato
Monitoring ocean surface winds is essential for understanding ocean and atmosphere interactions and weather forecasts. However, wind measured by satellite scatterometers and buoys are spatially and temporally coarse, particularly in coastal areas. We deployed small global positioning system units on soaring seabirds to record their tracks. Seabirds were accelerated by tail winds or slowed down by head winds during flight, so their flight speed changed in relation to wind speed and direction. Taking advantage of...

Data from: Resveratrol supplementation reduces oxidative stress and modulates the immune response in free-living animals during a viral infection

Manrico Sebastiano, Marcel Eens, Simone Messina, Hamada Ablelgawad, Kévin Pineau, Gerrit T.S. Beemster, Olivier Chastel, David Costantini, Hamada AbdElgawad & Gerrit T. S. Beemster
1. Diet quality may have an important effect on the regulation of oxidative status and the immune system during an infectious disease. However, the relationship among intake of specific dietary molecules, an individual’s oxidative status and the occurrence and progress of a viral disease remains almost unexplored in free-living organisms. 2. Here, we study a wild, long-lived animal, the Magnificent frigatebird Fregata magnificens to investigate: i) the differences in a number of physiological traits (biomarkers...

Bolivie : fin de cycle (Les Études du CERI, n°245-246)

Sebastián Urioste
En 2005, l’élection au premier tour de Evo Morales avec 53,74 % des voix et un écart de plus de vingt-cinq points avec le candidat arrivé en deuxième position a signé la fin d’une ère très particulière dans l’histoire électorale et gouvernementale bolivienne, et le début d’une autre tout aussi singulière.

Data from: Universal metabolic constraints shape the evolutionary ecology of diving in animals

Wilco Verberk, Piero Calosi, Francois Brischoux, John Spicer, Theodore Garland & David Bilton
Diving as a lifestyle has evolved on multiple occasions when air-breathing terrestrial animals invaded the aquatic realm, and diving performance shapes the ecology and behaviour of all air-breathing aquatic taxa, from small insects to great whales. Using the largest dataset yet assembled, we show that maximum dive duration increases predictably with body mass in both ectotherms and endotherms. Compared to endotherms, ectotherms can remain submerged for longer, but the mass scaling relationship for dive duration...

Data from: Timing of spring departure of long distance migrants correlates with previous year's conditions at their breeding site

Françoise Amélineau, Nicolas Delbart, Philipp Schwemmer, Riho Marja, Jérôme Fort, Stefan Garthe, Jaanus Elts, Philippe Delaporte, Pierre Rousseau, Françoise Duraffour & Pierrick Bocher
Precise timing of the migration is crucial for animals targeting seasonal resources at locations encountered across their annual cycle. Upon departure, long distance migrants need to anticipate unknown environmental conditions at their arrival site, and they do zkzdsxso with their internal annual clock. Here, we tested the hypothesis that long distance migrants synchronize their circannual clock according to the phenology of their environment during the breeding season, and therefore adjust their spring departure date according...

The ULR-repro3 GPS data reanalysis solution (aka ULR7a)

Mederic Gravelle, Guy Woppelmann, Kevin Gobron, Zuheir Altamimi, Mikaël Guichard, Thomas Herring & Paul Rebischung
The ULR analysis center has participated in the third reprocessing campaign (repro3) of the International GNSS Service (IGS). Its ULR-repro3 solution (aka ULR7) included 601 stations for which the GNSS data available between 2000.0 and 2021.0 was reprocessed using the models and corrections adopted by the IGS for repro3. The main steps and features of ULR-repro3 reanalysis are as follows. First, daily GNSS solutions were computed using a free-network weighted least squares adjustment strategy. That...

Feeding sites characteristics of the Northern shoveler Spatula clypeata in prenuptial stopover

Axelle Moreau, Clément Rousseau, Pierrick Bocher, Christine Dupuy & Sébastien Farau
Dabbling ducks choose a multitude of habitats throughout their life cycle. This choice depends on the abundance, diversity, and accessibility of food resources. Wetlands such as the Marais breton and Marais poitevin (Atlantic coast, France) are common habitats for several Anatidae, especially during their prenuptial migration. However, studies on the food ecology of Anatidae at stopover sites are limited. Therefore, this study focused on the Northern shoveler Spatula clypeata, a species that regularly inhabits the...

Bolivie : le retour du Mouvement vers le socialisme (Les Études du CERI, n°252-253)

Sebastián Urioste
L’annulation de l’élection présidentielle de 2019 a clos une crise politique et sociale qui a entraîné la Bolivie au bord de la guerre civile. Une année de campagne s’ouvrait à nouveau, marquée par l’épidémie de Covid-19. A son issue, le Mouvement vers le socialisme (MAS) est revenu triomphalement au pouvoir, cette fois sans la candidature d’Evo Morales.

Data from: To breed or not to breed: endocrine response to mercury contamination by an Arctic seabird

Sabrina Tartu, Aurélie Goutte, Paco Bustamante, Frédéric Angelier, Børge Moe, Céline Clément-Chastel, Claus Bech, Geir Wing Gabrielsen, Jan Ove Bustnes & Olivier Chastel
Mercury, a ubiquitous toxic element, is known to alter expression of sex steroids and to impair reproduction across vertebrates but the mechanisms underlying these effects are not clearly identified. We examined whether contamination by mercury predicts the probability to skip reproduction in black-legged kittiwakes (Rissa tridactyla) from Svalbard. We also manipulated the endocrine system to investigate the mechanism underlying this relationship. During the pre-laying period, we injected exogenous GnRH (gonadotropin-releasing hormone) to test the ability...

Data from: The relative importance of green infrastructure as refuge habitat for pollinators increases with local land-use intensity

Pengyao Li, David Kleijn, Isabelle Badenhausser, Carlos Zaragoza-Trello, Nicolas Gross, Ivo Raemakers & Jeroen Scheper
1. Agricultural expansion and intensification have resulted in strong declines in farmland biodiversity across Europe. In many intensively farmed landscapes, linear landscape elements such as field boundaries, road verges and ditch banks are the main remaining green infrastructures providing refuge for biodiversity, and as such play a pivotal role in agri-environmental policies aiming at mitigating biodiversity loss. Yet, while we have a fairly good understanding of how agricultural intensification influences biodiversity on farmland, little is...

Lack of synchronized breeding success in a seabird community: extreme events, niche separation, and environmental variability

Casey Youngflesh, Yun Li, Heather Lynch, Karine Delord, Christophe Barbraud, Rubao Ji & Stephanie Jenouvrier
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...

Seascape genetics of the Atlantic spotted dolphin (Stenella frontalis) based on mitochondrial DNA

Karina Bohrer Do Amaral, Dalia C. Barragán-Barrera, Roosevelt A. Mesa-Gutiérrez, Nohelia Farias-Curtidor, Susana J. Caballero Gaitán, Paula Méndez-Fernandez, Marcos C. Oliveira Santos, Caroline Rinaldi, Renato Rinaldi, Salvatore Siciliano, Vidal Martín, Manuel Carillo, Ana Carolina O. De Meirelles, Valentina Franco-Trecu, Nelson J. R. Fagundes, Ignacio Benites Moreno, L. Lacey Knowles & Ana Rita Amaral
The Atlantic spotted dolphin (Stenella frontalis) is endemic to tropical, subtropical, and warm temperate waters of the Atlantic Ocean. Throughout its distribution, both geographic distance and environmental variation may contribute to population structure of the species. In this study we follow a seascape genetics approach to investigate population differentiation of Atlantic spotted dolphins based on a large worldwide dataset and the relationship with marine environmental variables. The results revealed that the Atlantic spotted dolphin exhibits...

Data from: A risk-based forecast of extreme mortality events in small cetaceans: using stranding data to inform conservation practice

Colin Bouchard, Cameron Bracken, Willy Dabin, Olivier Van Canneyt, Vincent Ridoux, Jérôme Spitz & Matthieu Authier
Effective conservation requires monitoring and pro-active risk assessments. We studied the effects of at-sea mortality events (ASMEs) in marine mammals over two decades (1990-2012) and built a risk- based indicator for the European Union’s Marine Strategy Framework Directive (MSFD). Strandings of harbour porpoises (Phocoena phocoena), short-beaked common dolphins (Delphinus delphis), and striped dolphins (Stenella coeruleoalba) along French coastlines were analysed using Extreme Value Theory (EVT). EVT operationalises what is an extreme ASME, and allows the...

Data from: Ecological opportunities and specializations shaped genetic divergence in a highly mobile marine top predator

Marie Louis, Michael C. Fontaine, Jérôme Spitz, Erika Schlund, Willy Dabin, Robert Deaville, Florence Caurant, Yves Cherel, Christophe Guinet & Benoit Simon-Bouhet
Environmental conditions can shape genetic and morphological divergence. Release of new habitats during historical environmental changes was a major driver of evolutionary diversification. Here, forces shaping population structure and ecotype differentiation (‘pelagic’ and ‘coastal’) of bottlenose dolphins in the North-east Atlantic were investigated using complementary evolutionary and ecological approaches. Inference of population demographic history using approximate Bayesian computation indicated that coastal populations were likely founded by the Atlantic pelagic population after the Last Glacial Maxima...

Towards common file formats and data standards for seafloor geodesy

Pierre Sakic, Valerie Ballu, Heidrun Kopp, Dietrich Lange & Jean-Yves Royer

Data from: Climate change and functional traits affect population dynamics of a long-lived seabird

Stephanie Jenouvrier, Marine Desprez, Rémi Fay, Christophe Barbraud, Henri Weimerskirch, Karine Delord & Hal Caswell
1. Recent studies unravelled the effect of climate changes on populations through their impact on functional traits and demographic rates in terrestrial and freshwater ecosystems, but such understanding in marine ecosystems remains incomplete. 2. Here, we evaluate the impact of the combined effects of climate and functional traits on population dynamics of a long-lived migratory seabird breeding in the southern ocean: the black-browed albatross (Thalassarche melanophris, BBA). We address the following prospective question: ''Of all...

Agricultural intensification reduces plant taxonomic and functional diversity across European arable systems.

Carlos P Carmona, Irene Guerrero, Begoña Peco, Manuel B. Morales, Juan J Onate, Tomas Pärt, Teja Tscharntke, Jaan Liira, Tsipe Aavik, Mark Emmerson, Frank Berendse, Piotr Ceryngier, Vincent Bretagnolle, Wolfgang Weisser & Jan Bengtsson
1. Agricultural intensification is one of the main drivers of species loss worldwide, but there is still a lack of information about its effect on functional diversity of arable weeds communities. 2. Using a large scale pan European study including 786 fields within 261 farms from eight countries, we analysed differences in the taxonomic and functional diversity of arable weeds assemblages across different levels of agricultural intensification in. We estimated weed species frequency in each...

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