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Carbon and nitrogen stable isotopes were used to study depth variation in terrestrial particulate organic matter (POM) sedimentation off the mouth of the Rhone River delta, and its use by the main benthic invertebrates (polychaetes, crustaceans, molluscs and echinoderms) and flat- fishes (Arnoglossus laterna, Buglossidium luteum and Solea solea). Coastal water POM and surface sediment exhibited low δ 13 C values, denoting dominance of terrestrial material in their carbon pools (25 to 80% and >50%, respectively), but the importance of river input differed as a function of depth. Terrestrial organic matter contribution to the total POM was greatest at 30-50 m (72 to 99%), and least at 70-100 m depth (25 to 77%). Most of the invertebrate groups studied (δ 13 C = -24.5 to -17.5‰; δ 15 N = 4.3 to 9.7‰) mainly relied on marine primary production irrespective of depth. However, deposit-feeding polychaetes mainly exploited terrestrial POM, and carnivorous and suspension-feed- ing polychaetes, bivalves, brachyurans and shrimps (Caridea) showed a partial uptake of terrestrial POM, depending on its availability. Incorporation of terrestrial POM by flatfishes (δ 13 C = -22.4 to -16.8‰; δ 15 N = 9.7 to 11.2‰) was species- and depth-dependent. It was related not only to the fishes' diets but also to the trophic adaptability of their prey. S. solea, the main consumer of deposit-feeding polychaetes, showed the lowest δ 13 C irrespective of depth, but flatfish exploitation of terrestrial POM peaked at 30-50 m, where both polychaete consumption by fishes and terrestrial POM use by the benthos were maximal. Unlike most estuarine systems, terrestrial inputs in deltaic areas can there- fore peak at intermediate depths, where some of the marine macrobenthos, including flatfishes, effi- ciently exploit them. These results allow better assessment of the role of river input to marine coastal zones in increasing fish abundance, and will therefore be of major interest for demersal fisheries management off deltaic areas.

marine ecology. progress series

Depth variation in terrestrial particulate organic matter exploitation by marine coastal benthic communities off the Rhone River delta (NW Mediterranean)