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Sloterdijk H., Brehmer Patrice, Sadio O., Muller H., Doring J., Ekau W. (2017). Composition and structure of the larval fish community related to environmental parameters in a tropical estuary impacted by climate change. Estuarine Coastal and Shelf Science, 197, 10-26. ISSN 0272-7714

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Lien direct chez l'éditeur doi:10.1016/j.ecss.2017.08.003

Titre
Composition and structure of the larval fish community related to environmental parameters in a tropical estuary impacted by climate change
Année de publication2017
Type de documentArticle référencé dans le Web of Science WOS:000412252800002
AuteursSloterdijk H., Brehmer Patrice, Sadio O., Muller H., Doring J., Ekau W.
SourceEstuarine Coastal and Shelf Science, 2017, 197, p. 10-26. ISSN 0272-7714
RésuméMangrove ecosystems have long been considered essential habitats and are commonly viewed and referred to as "nursery areas". They are highly sensitive to, climate change, and environmental transformations in these ecosystems are expected. The Sine Saloum estuary is a case of a system affected by global climate change where reduced precipitation and temperature increase have resulted in an inversion of the salinity gradient. Within the estuary, the composition and structure of the larval fish community related to environmental parameters were investigated using neuston and ring trawl nets. Larval fishes were sampled at 16 stations distributed along a salinity and distance-to-the-sea gradient during four field campaigns (November 2013, February, June, and August 2014) covering an annual cycle. This is the first study documenting the spatial and temporal assemblages of fish larvae in an inverse estuary. The total of 41 taxa representing 24 families and 34 genus identified in this study was lower than that of other tropical estuaries. Clupeidae spp. was the dominant taxon, accounting for 28.9% of the total number of fish larvae caught, followed by Gerreidae spp. (21.1%), Hyporamphus picarti (18.8%), Diplodus bellottii (8.9%), Hypleurochilus langi (4.8%), Mugilidae spp. (4.4%), and Gobiidae sp.1 (3.5%). A total of 20 taxa were recorded within the upper estuary region, whereas 29 and 37 taxa were observed in the middle and lower reaches, respectively. While larval fish were captured at all sites and during all seasons, abundances and richness decreased with increasing salinity. Larval fish assemblages also showed a clear vertical structure corresponding to three distinct water strata. Salinity, water temperature, and dissolved oxygen were the variables that best explained the spatial and temporal differences in larval fish assemblages. It is difficult to forecast the future situation for this system but so far, compared to other mangrove estuarine systems, we have observed the loss of freshwater species in favour of species of marine origin. The information provided in the present study is a contribution to the knowledge of tropical biodiversity and modifications of the ichthyoplankton communities in the context of climate change and future green fund action.
Plan de classementEcologie, systèmes aquatiques [036] ; Sciences du milieu [021]
Descr. géo.SINE SALOUM ; SENEGAL
LocalisationFonds IRD [F B010071068]
Identifiant IRDfdi:010071068
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010071068

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