Ictioplâncton na Unidade de Conservação Reserva Biológica Marinha do Arvoredo e Áreas Costeiras Adjacentes, Santa Catarina, Brasil

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

Arvoredo Island (Santa Catarina, Brazil) and its surrounding area were defined as Conservation Unit (CU) in the category of Biological Reserve in 1990. Biological Reserves are protected areas that have complete and permanent preservation of local flora and fauna, thus contributing to the increase of abundance and diversity of species. This research aimed at analyzing the interannual and seasonal variations of ichthyoplankton densities at Arvoredo Marine Biology Reserve (RBMA) and Adjacent Coastal Areas, and their relationship with environmental variables. Ichthyoplanktonic community was sampled in winter and summer for the years 1997/1998 and 2007/2008 in RBMA, and during the four seasons in 2007 in Adjacent Coastal Areas (Tijucas` Bay, Ingleses Beach and Joaquina Beach). Fish eggs and larvae were sampled using a WP-2 net, 200 m mesh size. A flowmeter was used to measure the water volume filtered, and samples were preserved in formalin at 4%. At the laboratory, ichthyoplankton was sorted, quantified and identified to the lowest taxon possible. Physical and chemical water parameters (temperature and salinity) were recorded by probe (CTD), and water transparency was obtained by Secchi disk. The study area, at the year of 2007/2008, was influenced by three water mass, (i) Coastal Water (CW) throughout the year, (ii) Subtropical Shelf Water (STSW) during the winter and (iii) South Atlantic Central Water (SACW) mainly in summer. Ichthyoplanktonic community was represented by 33 taxa belonging to 20 families, in which Blenniidae, Carangidae, Clupeidae, Engraulidae, Gerreidae, Gobiidae, Haemulidae, Paralichthyidae and Sciaenidae were the most abundant. At RBMA, similarity on the ecological index was observed for the two periods analysed, with highest values of richness and diversity occurring in the summer. Cluster analysis showed similarity between years, denoting that ichthyoplanktonic community has maintained the same taxa and abundances for samples taken with an interval of 10 years. Taxonomic composition of RBMA presented low similarity to Adjacent Coastal Areas, featuring the reserve as a distinct habitat despite its proximity to the coast

ASSUNTO(S)

oceanografia ictioplâncton unidade de conservação reserva biológica marinha

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