Mudflat nekton assemblages in the Tagus estuary (Portugal): distribution and feeding patterns

Susana França; Miguel A. Pardal; Henrique N. Cabral

doi:10.3989/scimar.2008.72n3591

Authors

Susana França Instituto de Oceanografia, Faculdade de Ciências da Universidade de Lisboa
Miguel A. Pardal IMAR – Institute of Marine Research, Department of Zoology, University of Coimbra
Henrique N. Cabral Departamento de Biologia Animal, Faculdade de Ciências da Universidade de Lisboa

DOI:

https://doi.org/10.3989/scimar.2008.72n3591

Keywords:

nekton, community structure, daily rations, mudflat, intertidal areas, Tagus estuary

Abstract

Mudflats are an important component of estuaries, where they may occupy large areas and provide feeding and nursery grounds for many fish and bird species, as in the Tagus estuary. However, knowledge on their role and functioning is still expanding. Spatial and temporal dynamics of nekton assemblages in a mudflat of the Tagus estuary were evaluated to determine their role in the estuarine functioning. Feeding activity and daily rations of the most important nekton species are also analyzed. Two intertidal mudflat areas (upper and lower) were sampled, as well as the adjoining subtidal area. Sampling was conducted every two months, during a yearly cycle. A 24 h sampling cycle was conducted to investigate daily feeding patterns and determine daily rations. Crangon crangon, Carcinus maenas, Palaemon longirostris, Palaemon serratus and Pomatoschistus microps dominated the nekton community. A marked seasonal pattern was noticed with the highest densities recorded in spring and summer, corresponding to recruitment episodes of these species. Highest biomass values were recorded in the subtidal zone, while the highest densities were recorded in the intertidal zone. The mudflats seem to play an important role in the dynamics of the Tagus estuary, acting as a feeding and nursery areas for several nektonic species.

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