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Title of Journal: Hydrobiologia

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Abbravation: Hydrobiologia

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Springer International Publishing

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DOI

10.1016/0003-6870(73)90250-0

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1573-5117

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A food web analysis of the Río de la Plata estuary

Authors: Diego Lercari Sebastían Horta Gastón Martínez Danilo Calliari Leandro Bergamino
Publish Date: 2014/07/20
Volume: 742, Issue: 1, Pages: 39-58
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Abstract

This article performed a comprehensive assessment of the structure and functioning of the Río de la Plata estuary and adjacent shelf ecosystem including the effect of fishing A formerly implemented 37 trophic groups’ massbalance model Ecopath was used to 1 evaluate the particular role of individual biotic components on the ecosystem 2 characterize the ecosystem in terms of aquatic food web theory and 3 assess the role of diverse fishing fleets on the ecosystem Our results indicate a trophic structure and functioning common to other estuaries where outstanding primary production exceeds consumption and detritus accumulates in the system Moreover our analysis revealed an elevated total system throughput herbivory outweighing detritivory and an intermediate state in terms of ecosystem growth and development Fisheries analyses showed widespread impacts produced by industrial bottom trawl fleets and specific impacts produced by artisanal fisheries over several groups Unexpectedly the evaluation of the effects of fishing showed minor ecosystem consequences by the loss of secondary production and suggests exploitation rates at sustainable levels This study sets up the basis for temporal ecosystemlevel monitoring of the state of the Río de la Plata estuary and adjacent shelf ecosystemWe are very grateful for the constructive comments made by two anonymous referees that substantially improve the manuscript We also thank all the people that produced fundamental information for the implementation of the ecosystem model for the Río de la Plata English language final revision by D Szteren is also acknowledged Support from projects PDT 7107 and DINARA/FAO/GEF ID 3410 is also recognized DC was partially supported by CSICUdelaR Grupos I + D Programme 1037 We are grateful to the Uruguayan National Aquatic Resources Office DINARA Uruguay for providing useful information during 2007

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