@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 {5366, title = {Regional and latitudinal patterns of soft-bottom macrobenthic invertebrates along French coasts: Results from the RESOMAR database}, journal = {Journal of Sea Research}, volume = {130}, year = {2017}, pages = {96 - 106}, abstract = {

This study aims to describe the patterns of soft bottom macrozoobenthic richness along French coasts. It is based on a collaborative database developed by the {\textquotedblleft}R{\'e}seau des Stations et Observatoires Marins{\textquotedblright} (RESOMAR). We investigated patterns of species richness in sublittoral soft bottom habitats (EUNIS level 3) at two different spatial scales: 1) seaboards: English Channel, Bay of Biscay and Mediterranean Sea and 2) 0.5{\textdegree} latitudinal and longitudinal grid. Total observed richness, rarefaction curves and three incidence-based richness estimators (Chao2, ICE and Jacknife1) were used to compare soft bottom habitats species richness in each seaboard. Overall, the Mediterranean Sea has the highest richness and despite higher sampling effort, the English Channel hosts the lowest number of species. The distribution of species occurrence within and between seaboards was assessed for each major phylum using constrained rarefaction curves. The Mediterranean Sea hosts the highest number of exclusive species. In pairwise comparisons, it also shares a lower proportion of taxa with the Bay of Biscay (34.1\%) or the English Channel (27.6\%) than that shared between these two seaboards (49.7\%). Latitudinal species richness patterns along the Atlantic and English Channel coasts were investigated for each major phylum using partial LOESS regression controlling for sampling effort. This showed the existence of a bell-shaped latitudinal pattern, highlighting Brittany as a hotspot for macrobenthic richness at the confluence of two biogeographic provinces.

}, keywords = {France, Latitudinal pattern, Regional pattern, Soft-bottom, Species richness, Zoobenthos}, issn = {1385-1101}, doi = {https://doi.org/10.1016/j.seares.2017.03.011}, url = {http://www.sciencedirect.com/science/article/pii/S1385110116302660}, author = {R{\'e}gis K. Gallon and Nicolas Lavesque and Jacques Grall and C{\'e}line Labrune and Antoine Gr{\'e}mare and Guy Bachelet and Hugues Blanchet and Paulo Bonif{\'a}cio and Vincent M.P. Bouchet and Jean-Claude Dauvin and Nicolas Desroy and Franck Gentil and Laurent Guerin and C{\'e}line Houbin and J{\'e}r{\^o}me Jourde and Sandrine Laurand and Michel Le Duff and Vincent Le Garrec and Xavier de Montaudouin and Fr{\'e}d{\'e}ric Olivier and Francis Orvain and Pierre-Guy Sauriau and Eric Thi{\'e}baut and Olivier Gauthier} }