Mudanças temporais na abundância e diversidade da fauna de peixes do infralitoral raso de uma praia, sul do Brasil

Abundance and diversity of the fish fauna in the shallow infralittoral region of Atami Beach, Paraná, Brazil, were studied through monthly collections between July 1998 and June 1999. A total of 7553 fishes from 70 species and 26 families, mainly juvenile forms, was captured in the area. The mean captures in number of species, number of fish and biomass were larger from the end of spring to the middle of autumn; seasonal tendency in richness, diversity (number) and equitability indices were not observed. The largest mean dissimilarity in the composition of the ichthyofauna occurred between June and May in comparison to the period between July and October. The species that contributed most to this dissimilarity were Selene setapinnis (Mitchill, 1815), Conodon nobilis (Linnaeus, 1758) and Stellifer rastrifer (Jordan, 1889). Three great groups reflecting patterns of temporal occurrence of the most abundant species were identified.

Mudanças temporais na abundância e diversidade da fauna de peixes do infralitoral raso de uma praia, sul do Brasil

Abundance and diversity of the fish fauna in the shallow infralittoral region of Atami Beach, Paraná, Brazil, were studied through monthly collections between July 1998 and June 1999. A total of 7553 fishes from 70 species and 26 families, mainly juvenile forms, was captured in the area. The mean captures in number of species, number of fish and biomass were larger from the end of spring to the middle of autumn; seasonal tendency in richness, diversity (number) and equitability indices were not observed. The largest mean dissimilarity in the composition of the ichthyofauna occurred between June and May in comparison to the period between July and October. The species that contributed most to this dissimilarity were Selene setapinnis (Mitchill, 1815), Conodon nobilis (Linnaeus, 1758) and Stellifer rastrifer (Jordan, 1889). Three great groups reflecting patterns of temporal occurrence of the most abundant species were identified.

Mudanças temporais na abundância e diversidade da fauna de peixes do infralitoral raso de uma praia, sul do Brasil

Abundance and diversity of the fish fauna in the shallow infralittoral region of Atami Beach, Paraná, Brazil, were studied through monthly collections between July 1998 and June 1999. A total of 7553 fishes from 70 species and 26 families, mainly juvenile forms, was captured in the area. The mean captures in number of species, number of fish and biomass were larger from the end of spring to the middle of autumn; seasonal tendency in richness, diversity (number) and equitability indices were not observed. The largest mean dissimilarity in the composition of the ichthyofauna occurred between June and May in comparison to the period between July and October. The species that contributed most to this dissimilarity were Selene setapinnis (Mitchill, 1815), Conodon nobilis (Linnaeus, 1758) and Stellifer rastrifer (Jordan, 1889). Three great groups reflecting patterns of temporal occurrence of the most abundant species were identified.

Moon and tidal influences on catch composition of fishes in one tidal flat of the Paranaguá Bay, Paraná, Brazil / Efeito da lua e da maré na captura de peixes em uma planície de maré da Baía de Paranaguá, Paraná, Brasil

In a tidal flat of the Paranaguá Bay, the influence of the tide and lunar phase on the capture of fish was analyzed. The collections were accomplished in the high tide and low tide of the syzygial (full moon) and quadrature (waning moon) tides, between August 1998 and July 1999. At all collection moments, two tows were made parallel to the coast, in the direction of the current, in 100 m long areas marked on the beach beforehand, using a seine net of 30.0 m x 2.0 m with a mesh of 0.5 cm between adjacent knots and a 2 m long bag. A total of 47,012 fish specimens were captured (179 kg), belonging to 110 species from 43 families. The mean number of species captured was significantly higher at full moon, while the mean diversity and equitability were statistically higher at high tide. On average, the size and weight of the fishes were also larger in the full moon and in the high tide. Between the phases of the moon and the two tides, statistical differences were not observed among the averages of the number of fish, weight of the capture and richness. The species structures were different between the captures at the low tide and high tide of the full moon and between the low tide of the full moon and the high tide of the waning moon. During the latter, the largest mean dissimilarity was observed, and the species that more contributed to this dissimilarity were Anchoa tricolor and A

Em uma planície de maré da Baía de Paranaguá foi analisada a influência da maré e da fase lunar sobre as capturas de peixes. As coletas foram realizadas na preamar e baixa-mar das marés de sizígia (lua cheia) e de quadratura (lua minguante), entre agosto de 1998 e julho de 1999. Em cada momento amostral foram realizados, no sentido da corrente, dois arrastos consecutivos e paralelos à costa, em áreas com 100 metros de extensão, com rede tipo picaré com 30,0 m x 2,0 m e 0,5 cm de malha entre nós adjacentes e saco com 2 m de comprimento. Foram capturados 47.012 exemplares de peixes (179 kg), pertencentes a 110 espécies e 43 famílias. O número médio de espécies capturadas foi significativamente maior na lua cheia, enquanto que a diversidade média e a equitatividade média foram estatisticamente maiores na preamar. Em média, o tamanho e o peso dos exemplares também foram maiores na lua cheia e na preamar. Entre as fases da lua e as duas marés não foram observadas diferenças estatísticas entre as médias do número de peixes, peso da captura e riqueza. As estruturas em espécie foram diferentes entre as capturas da baixa-mar e preamar da lua cheia e entre a baixa-mar da lua cheia e a preamar da lua minguante, observando-se entre as duas últimas a maior dissimilaridade média, sendo as espécies Anchoa tricolor e Anisotremus surinamensis as maiores responsáveis por tal dissimilaridade. &am

Moon and tidal influences on catch composition of fishes in one tidal flat of the Paranaguá Bay, Paraná, Brazil / Efeito da lua e da maré na captura de peixes em uma planície de maré da Baía de Paranaguá, Paraná, Brasil

In a tidal flat of the Paranaguá Bay, the influence of the tide and lunar phase on the capture of fish was analyzed. The collections were accomplished in the high tide and low tide of the syzygial (full moon) and quadrature (waning moon) tides, between August 1998 and July 1999. At all collection moments, two tows were made parallel to the coast, in the direction of the current, in 100 m long areas marked on the beach beforehand, using a seine net of 30.0 m x 2.0 m with a mesh of 0.5 cm between adjacent knots and a 2 m long bag. A total of 47,012 fish specimens were captured (179 kg), belonging to 110 species from 43 families. The mean number of species captured was significantly higher at full moon, while the mean diversity and equitability were statistically higher at high tide. On average, the size and weight of the fishes were also larger in the full moon and in the high tide. Between the phases of the moon and the two tides, statistical differences were not observed among the averages of the number of fish, weight of the capture and richness. The species structures were different between the captures at the low tide and high tide of the full moon and between the low tide of the full moon and the high tide of the waning moon. During the latter, the largest mean dissimilarity was observed, and the species that more contributed to this dissimilarity were Anchoa tricolor and A

Em uma planície de maré da Baía de Paranaguá foi analisada a influência da maré e da fase lunar sobre as capturas de peixes. As coletas foram realizadas na preamar e baixa-mar das marés de sizígia (lua cheia) e de quadratura (lua minguante), entre agosto de 1998 e julho de 1999. Em cada momento amostral foram realizados, no sentido da corrente, dois arrastos consecutivos e paralelos à costa, em áreas com 100 metros de extensão, com rede tipo picaré com 30,0 m x 2,0 m e 0,5 cm de malha entre nós adjacentes e saco com 2 m de comprimento. Foram capturados 47.012 exemplares de peixes (179 kg), pertencentes a 110 espécies e 43 famílias. O número médio de espécies capturadas foi significativamente maior na lua cheia, enquanto que a diversidade média e a equitatividade média foram estatisticamente maiores na preamar. Em média, o tamanho e o peso dos exemplares também foram maiores na lua cheia e na preamar. Entre as fases da lua e as duas marés não foram observadas diferenças estatísticas entre as médias do número de peixes, peso da captura e riqueza. As estruturas em espécie foram diferentes entre as capturas da baixa-mar e preamar da lua cheia e entre a baixa-mar da lua cheia e a preamar da lua minguante, observando-se entre as duas últimas a maior dissimilaridade média, sendo as espécies Anchoa tricolor e Anisotremus surinamensis as maiores responsáveis por tal dissimilaridade. &am