Fauna bÃntica do infralitoral e alimentaÃÃo natural de Callinectes danae Smith, 1869 (Crustacea,Portunidae) nos estuÃrios dos rios Botafogo e Carrapicho, Pernambuco, Brasil

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

In tropical and subtropical regions are the mangroves to have favourable conditions for food, protection and reproduction of various species of animals. The estuarine complex of Santa Cruz Channel deserves attention for its high productivity and to present an intense fishing activity. In this context, the crab Callinectes danae Smith, 1869 has important role in the trophic dynamics of these ecosystems, acting mainly as necrophagous and active predators. This way, this study aimed to promote the qualitative and quantitative study of the benthic fauna of infralitoral and know the natural feeding of C. danae of Botafogo and Carrapicho rivers through the analysis of stomach contents. As defined by the Millennium Institute - "Use and resources of the coastal zone," was defined the Botafogo River test area and Carrapicho River as control area. Along each river were demarcated four stations, in which collections were made day in August and October 2003, January, February, June and August 2004, through drag with net door with a mesh bag of 5mm, with duration of 15 minutes. In the field samples were labeled, packed in plastic bags and kept in thermal box with ice. Data on depth, salinity and water temperature of each station of collection were recorded. In the Laboratory of Carcinology - DOCEAN / UFPE bodies were screened, identified under stereomicroscope with the help of relevant literature, counted and kept in plastic pots with alcohol at 75%. They have identified representatives seven taxonomic groups: Sipuncula, Porifera, Polychaeta, Mollusca, Echinodermata, Crustacea and Chordata; and 51 species, with two new records for the areas studied (Charybdis hellerii and Paguristes triangulopsis). Of these, the Botafogo River presented 31 species in 8.055 individuals, of whom are Mollusca 70.9%, 27.6% Crustacea and 1.7% Echinodermata. While the Carrapicho River showed 47 species of a total of 1.013 individuals of which 62.2% are Crustacea, Echinodermata 20.5%, 9.2% Mollusca and 8.1% Polychaeta. The other taxonomic groups were not used in statistical analysis and Botafogo River presented no species of the group Polychaeta. Anomalocardia brasiliana was the most abundant species and dominant in Botafogo River and C. danae in Carrapicho River. The species of benthic fauna showed higher values of frequency of occurrence and abundance during the dry period for the areas studied. Separately C. danae were sexed and measured weight and width of shell. Later the stomachs were removed, weighed and estimated the degree of repletion stomach. Also under the stereomicroscope and literature relevant feeding items were identified and applied the methodology of points. Nine items have been identified in the natural feeding of C. danae in the rivers studied, Algae, Macrophyta, Foraminiferida, Mollusca, Polychaeta, Crustacea, Echinodermata, Teleostei and MOA (Animal organic matter). MOA, Mollusca and Crustacea were the items most frequently encountered. In the analysis feeding of males and females there was no differences in food preference. In the areas studied Mollusca was the item of greatest contribution during the dry period and MOA in the rainy period. In Botafogo River, adult and young categories showed differences in the preference of food during the dry period, Mollusca and MOA respectively, and similar in the rainy period, MOA for both categories. Already in Carrapicho River the results were similar, the young and adult categories preferably consumed Mollusca in the dry period and Crustacea in the rainy period. Therefore, C. danae is a species of opportunistic feeding habits and their food preference may reflect the amount of their prey in the environment, since their preferential items corresponded to the group of most abundant species in this work

ASSUNTO(S)

canal de santa cruz santa cruz channe oceanografia rio carrapicho estuÃrio callinectes danae fauna bÃntica carrapicho river alimentaÃÃo natural callinectes danae natural feeding benthic fauna rio botafogo botafogo river

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