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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Composi??o e estrutura de comunidade de peixes em diferentes praias da Ba?a de Todos os Santos, Bahia, Brasil

Duarte, Luiz Alberto de G?es 04 February 2013 (has links)
Submitted by Ricardo Cedraz Duque Moliterno (ricardo.moliterno@uefs.br) on 2016-03-01T00:26:45Z No. of bitstreams: 1 Disserta??o Luiz Alberto.pdf: 2080024 bytes, checksum: e6fbb727385961e9b7622db8acdbd075 (MD5) / Made available in DSpace on 2016-03-01T00:26:45Z (GMT). No. of bitstreams: 1 Disserta??o Luiz Alberto.pdf: 2080024 bytes, checksum: e6fbb727385961e9b7622db8acdbd075 (MD5) Previous issue date: 2013-02-04 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / A year-long otter trawl survey in the Todos os Santos bay (TSB) was conducted between November 2011 and September 2012 with the aim of describing the composition and structure of fish communities of the bay and check community fluctuations in both periods of the hydrological cycle (dry and wet). Fifty-three morphospecies were catch, comprising 10 orders and 29 families. The most representative families in terms of species richness were, respectively, Carangidae, Gerreidae, Syngnathidae, Engraulidae, Gobiidae and Paralichthyidae. Despite the significant number of species caught, the fish community of the Todos os Santos bay, on the beaches sampled with trawl, is dominated by five species: Atherinella brasiliensis, Sphoeroides greeleyi, Eucinostomus argenteus, Sphoeroides testudineus and Lile piquitinga, which represent 99.5% of the relative importance of the catch. Influences of environmental parameters of rainfall, temperature and salinity on the composition and structure of fish fauna of TSB were absent or very subtle. The use of different fishing gear (simple net and with bag) did not influence the values of CPUE for different beaches sampled. We can conclude that the shallow areas of the Todos os Santos bay have quite important for maintaining their fish stocks, since species (including commercial interest) to use, partially or completely, the TSB as nursery or creation area. / Um programa de amostragens bimstrais de arrasto de praia em seis esta??es de coleta na Ba?a de Todos os Santos (BTS) foi realizado entre novembro de 2011 e setembro de 2012 com o objetivo de descrever a composi??o e estrutura da comunidade de peixes da ba?a e verificar flutua??es da comunidade nos dois per?odos do ciclo hidrol?gico (seco e chuvoso). Cinquenta e tr?s morfoesp?cies de peixes foram levantadas, compreendendo 10 ordens e 29 fam?lias. As fam?lias mais representativas em termos de riqueza de esp?cie foram, respectivamente, Carangidae, Gerreidae, Syngnathidae, Engraulidae, Gobiidae e Paralichthyidae. Apesar do n?mero relevante de esp?cies capturadas, a comunidade ?ctica da Ba?a de Todos os Santos, nas praias amostradas com arrasto manual, ? dominada, basicamente por cinco esp?cies: Atherinella brasiliensis, Sphoeroides greeleyi, Eucinostomus argenteus, Sphoeroides testudineus e Lile piquitinga, as quais correspondem a 99.5% da import?ncia relativa das capturas. Influ?ncias dos par?metros ambientais de pluviosidade, temperatura e salinidade sobre a composi??o e estrutura da ictiofauna da BTS foram ausentes ou muito sutis. A utiliza??o de diferentes petrechos de pesca (rede simples e com saco) n?o influenciou nos valores de CPUE para as diferentes praias amostradas. O elevado n?mero de esp?cie tamb?m sugere que muitos peixes utilizam as zonas rasas da BTS como ?reas de cria??o, usufruindo da prote??o e alimento, portanto, pode-se concluir que as ?reas rasas da Ba?a de Todos os Santos possuem assaz import?ncia para manuten??o dos seus estoques pesqueiros, j? que esp?cies (inclusive de interesse comercial) a utilizam, parcial ou totalmente, como ?reas de ber??rio e/ou cria??o.

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