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Alterações da comunidade de peixes da zona arenosa da Baía de Porto Pim (Faial, Açores)
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Abstract(s)
De forma a estudar as possíveis alterações da comunidade de peixes da Baía de Porto Pim (Faial, Açores) em termos de composição e riqueza específicas e abundância, foram analisados dados recolhidos em três períodos de amostragem com rede de arrasto de praia. No primeiro período realizaram-se 11 meses de amostragem entre os meses de Junho de 1989 e Junho de 1990, no segundo, foram realizados 18 meses de amostragem entre Agosto de 1997 e Setembro de 1999, e no terceiro período foram realizados 12 meses de amostragem de Julho de 2011 e Junho de 2012. No terceiro período, foram analisadas as variações diárias e sazonais, tendo sido detectado uma preferência da comunidade por períodos nocturos e de baixa-mar, e fortes variações sazonais com valores elevados de abundância no Verão e mais baixos no Inverno. A análise dos três períodos permitiu determinar a existência de diferenças entre eles e relaciona-las com a variação da composição específica nos diferentes anos. A presença de uma grande densidade de juvenis de várias espécies ao longo de todo o ano, em todos os períodos reforça a ideia de que a Baía de Porto Pim se trata de uma importante zona de maternidade.
ABSTRACT: The aim of this work was to study possible changes in the fish community at Porto Pim Bay (Faial, Azores) in terms of compositions and specific richness, and also abundance. Data were collected with seine beach and three sampling periods were analyzed. In the first period, 11 months were sampled between July 1989 and June 1990; in the second period 18 months were sampled between August 1997 and September 1999; and in the third, 12 months were sampled between July 2011 and June 2012. Daily and seasonal changes were analyzed for the third period. The fish community showed preference for low tide periods at night and strong seasonal changes were observed with higher values of abundance in the summer and lower values in the winter. The analysis of the three sampling periods allowed determining the existence of significant differences between all of them. These differences were related to variations in species composition of the Bay in the different periods. The presence of high density juveniles of several species, throughout all year in each sampling period, reinforces the idea that Porto Pim Bay represents an important nursery ground.
ABSTRACT: The aim of this work was to study possible changes in the fish community at Porto Pim Bay (Faial, Azores) in terms of compositions and specific richness, and also abundance. Data were collected with seine beach and three sampling periods were analyzed. In the first period, 11 months were sampled between July 1989 and June 1990; in the second period 18 months were sampled between August 1997 and September 1999; and in the third, 12 months were sampled between July 2011 and June 2012. Daily and seasonal changes were analyzed for the third period. The fish community showed preference for low tide periods at night and strong seasonal changes were observed with higher values of abundance in the summer and lower values in the winter. The analysis of the three sampling periods allowed determining the existence of significant differences between all of them. These differences were related to variations in species composition of the Bay in the different periods. The presence of high density juveniles of several species, throughout all year in each sampling period, reinforces the idea that Porto Pim Bay represents an important nursery ground.
Description
Dissertação de Mestrado, Estudos Integrados dos Oceanos, 29 de Julho 2013, Universidade dos Açores.
Keywords
Ecologia Marinha Ictiologia Peixes Marinhos Ilha do Faial (Açores)
Pedagogical Context
Citation
Paulino, Bárbara Quaresma. "Alterações da comunidade de peixes da zona arenosa da Baía de Porto Pim (Faial, Açores)". 2013. XI, 70, 27 p.. (Dissertação de Mestrado em Estudos Integrados dos Oceanos) - Horta: Universidade dos Açores, 2013.