Macrobenthic associations in a South Atlantic Brazilian enclosed bay: the historical influence of shrimp trawling |
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| Authors: | de Almeida Tito Cesar Marques Vivan Jorge Matheus |
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| Institution: | Laboratory of Aquatic Communities Ecology, UNIVALI - Universidade do Vale do Itajaí, Rua Uruguai, 458, Centro Bloco 20 Sala 144, Caixa Postal 360, CEP 88302-202 Itajaí, SC, Brazil |
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| Abstract: | This study characterized the macrobenthos of Tijucas Bay and related the distribution and dominance patterns with historical trawling activities. Fifteen sampling sites were established in the bay and were sampled in summer and winter for the characterization of the macrobenthos. To evaluate the trawling effects, three passages were established at each site with control and impacted areas analyzed before and after trawl-net action in impacted area. Seasonal differences occurred in macrobenthos, possibly influenced by rainfall where the relative water level of the Tijucas River was directly associated with the discharge of freshwater and particulate matter. The associations identified in the bay were distinct in comparison with the Zimbros Embayment. The trawling assessment showed no significant variation in the macrobenthos after the trawl, possibly due to decades of shrimp exploitation in the bay. Trawling and instable environmental conditions inside the bay make the establishment of a stable macrobenthic community difficult. |
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| Keywords: | Macrobenthic associations Tijucas Bay Physical disturbance Trawling Diversity Restoration |
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