@article {9085, title = {Biogeographical snapshot of life-history traits of European silver eels: insights from otolith microchemistry}, journal = {Aquatic Sciences}, volume = {85}, year = {2023}, month = {Jan-04-2023}, abstract = {Life-history traits of eels display a high level of phenotypic plasticity in response to large-scale biogeographical drivers, as well as local conditions encountered during the continental phase. Here, we provided a biogeographical snapshot of the variability of life-history traits of eels (Anguilla anguilla), across a large proportion of their natural distribution range. Silver eels (n = 99) were collected across eleven European catchments to investigate how life-history traits vary along geographical and saline habitats, as it was inferred from the Sr:Ca ratio in otoliths. Among 13 life-history traits tested, 3 of them such as total length, body or liver weight were related to geographical coordinates. Overall, eels grow faster in southern Europe and migrate earlier suggesting that the silvering process is related to the local growth conditions more than fish age. The salinity profiles revealed by the otoliths{\textquoteright} Sr:Ca ratios indicate that eels with a brackish life-history generally grow faster, reach larger size-at-age, and have a better condition than eels living in freshwater. This observation associated with the lower abundance of the sanguivorous swimbladder nematode, Anguillicola crassus, confirms the importance of brackish areas for sustaining the eel production. A large proportion of the observed variation of life-history traits remained unexplained by the biogeographical trends and salinity condition, which suggests that other drivers act at the catchment scale.
}, keywords = {Anguilla anguilla, Biogeography, Brackish habitat, otolith, phenotypic plasticity, Sr:Ca ratio}, issn = {1015-1621}, doi = {10.1007/s00027-023-00940-4}, url = {https://link.springer.com/10.1007/s00027-023-00940-4}, author = {Teichert, Nils and Bourillon, Bastien and Suzuki, Kyoko and Acou, Anthony and Alexandre Carpentier and Kuroki, Mari and Righton, David and Thomas Trancart and Virag, Laure-Sarah and Walker, Alan and Otake, Tsuguo and Eric Feunteun} } @article {6047, title = {The global geography of fish diadromy modes}, journal = {Global Ecology and Biogeography}, year = {2019}, abstract = {

Aim: Geographical gradients in resource production are likely to translate into macroecological patterns in the biodiversity of migratory organisms, but few studies have addressed this question at a global scale. Here, we tested a hypothesis based on uncoupled latitudinal gradients in marine and freshwater primary productivities aimed at explaining where (e.g., at which latitude) and at which stage of the life cycle (larvae, amphidromy; juvenile, catadromy; or adult, anadromy) migration from ocean to freshwater occurs (diadromy).

Location: Global.

Time period: Current.

Major taxa studied: Fishes.

Methods: We modelled, using multinomial regressions, the proportion of catadromous, anadromous and amphidromous species in 994 river basins as a function of freshwater and marine net primary productivities (NPP; in milligrams of carbon per square metre per day) and additional biotic and abiotic variables. Using data extracted from the Global Biodiversity Information Facility (GBIF) database, we tested whether diadromous, catadromous and amphidromous species differed with respect to the NPP of their marine and freshwater occurrences.

Results: Among diadromous species, anadromous species are present in higher proportions when conditions for growth are more favourable in the sea (higher productivity, higher temperature and lower number of competitors) than in freshwaters. The model reconstructs the latitudinal pattern observed in the proportion of anadromous species, including an asymmetry between the Northern and Southern Hemispheres. According to GBIF occurrences, the ratio of marine over freshwater productivity is higher for anadromous species compared with catadromous and amphidromous species.

Main conclusions: Our results support the hypothesis stating that migration between ocean and freshwater occurs by choosing the biome that optimizes pre-reproductive growth and is one more example of the importance of primary productivity in shaping large-scale community patterns. This result suggests that some diadromous fish populations and species may suffer from anticipated climate change if interbiome productivity gradients are affected.

}, keywords = {amphidromy, anadromy, Biogeography, catadromy, dispersal, GBIF database, Last Glacial Maximum, latitudinal gradient, Migration, Species richness}, doi = {DOI: 10.1111/geb.12931}, author = {Chalant, Ana{\"\i}s and J{\'e}z{\'e}quel, C{\'e}line and Philippe Keith and Bernard Hugueny} } @article {5816, title = {{Uncertainties in the projection of species distributions related to general circulation models}}, journal = {Ecology and Evolution}, volume = {5}, year = {2015}, abstract = {

{\textcopyright} 2015 The Authors. Ecological Niche Models (ENMs) are increasingly used by ecologists to project species potential future distribution. However the application of such models may be challenging and some caveats have already been identified. While studies have generally shown that projections may be sensitive to the ENM applied or the emission scenario to name just a few the sensitivity of ENM-based scenarios to General Circulation Models (GCMs) has been often underappreciated. Here using a multi-GCM and multi-emission scenario approach we evaluated the variability in projected distributions under future climate conditions. We modeled the ecological realized niche (sensu Hutchinson) and predicted the baseline distribution of species with contrasting spatial patterns and representative of two major functional groups of European trees: the dwarf birch and the sweet chestnut. Their future distributions were then projected onto future climatic conditions derived from seven GCMs and four emissions scenarios using the new Representative Concentration Pathways (RCPs) developed for the Intergovernmental Panel on Climate Change (IPCC) AR5 report. Uncertainties arising from GCMs and those resulting from emissions scenarios were quantified and compared. Our study reveals that scenarios of future species distribution exhibit broad differences depending not only on emissions scenarios but also on GCMs. We found that the between-GCM variability was greater than the between-RCP variability for the next decades and both types of variability reached a similar level at the end of this century. Our result highlights that a combined multi-GCM and multi-RCP approach is needed to better consider potential trajectories and uncertainties in future species distributions. In all cases between-GCM variability increases with the level of warming and if nothing is done to alleviate global warming future species spatial distribution may become more and more difficult to anticipate. When future species spatial distributions are examined we propose to use a large number of GCMs and RCPs to better anticipate potential trajectories and quantify uncertainties.

}, keywords = {Biogeography, Climate Change, Ecological niche modeling, Global change models, Species distribution projections, Uncertainties}, issn = {20457758}, doi = {10.1002/ece3.1411}, author = {Goberville, Eric and Gr{\'e}gory Beaugrand and Nina-Coralie Hautek{\`e}ete and Yves Piquot and Christophe Luczak} }