Temporal changes of a macrobenthic assemblage in harsh lagoon sediments |
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| Authors: | Serena Como Paolo Magni |
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| Institution: | aIMC, International Marine Centre, Loc. Sa Mardini, Torregrande, 09072 Oristano, Italy;bLIENSs – UMR6250, Institut du Littoral et de l'Environnement, 2 rue Olympe de Gouges, 17042 La Rochelle, France;cCNR-IAMC, Consiglio Nazionale delle Ricerche, Istituto per l'Ambiente Marino Costiero, Loc. Sa Mardini, Torregrande, 09072 Oristano, Italy |
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| Abstract: | An opportunistic macrobenthic assemblage was studied from 2001 to 2003 in a central area of the Cabras lagoon (western Sardinia, Italy), known to be affected by environmental disturbances (i.e. organic over-enrichment of sediments, and episodic events of hypoxia/anoxia and sulphide development). We identified recurrent seasonal changes in this macrobenthic assemblage, with a general impoverishment in summer and a recovery in winter/spring. The nereids Neanthes succinea and Hediste diversicolor were found to replace the spionid Polydora ciliata as the most dominant species in the summer for 3 consecutive years. Occasional, unsynchronized appearances of small-sized deposit feeders, such as Tubificidae, Capitella cf. capitata, chironomid larvae and Hydrobia spp., were observed in winter/spring. We suggest that these changes are driven by the interplay of environmental conditions (worse in summer) with numerous biotic factors. This includes different tolerance levels of taxa to low oxygen concentrations and sulphides, variability in larval supply and post-larval transport, as well as competition for space and food between and within different functional groups, and facilitation through animal bioturbation and sediment reoxidation. A conceptual model is proposed to demonstrate how environmental conditions and biotic interactions may control the benthic assemblage in such a harsh lagoon environment. |
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| Keywords: | macrobenthos temporal scales environmental impact organic enrichment hypoxia competition coastal lagoons Mediterranean sea |
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