Nycthemeral and Monthly Occupation of the Fish Assemblage on a Sheltered Beach of Baía Norte, Florianópolis, Santa Catarina State, Brazil

Abstract

A B S T R A C TInterpreting fish community records is challenging for several reasons, including the lack of past ichthyofauna data, the cyclical temporal variations in the community, and the methodology employed, which usually underestimates fish assemblages. The objective of this study was to describe short-scale and meso-scale (nycthemeral period and months, respectively) temporal variations in the ichthyofauna composition and structure of a sheltered beach of Baía Norte (Florianópolis, Santa Catarina state, Brazil), using a capéchade net. Samples were collected monthly for a period of 48 hours. During the period from December 2010 to November 2011, a total of 19,302 individuals belonging to 89 species and 39 families were captured. The number of individuals that were sampled during the day and/or night was dependent on the sampling month. On average, the daytime assemblage was more abundant and different in structure and composition than the nighttime assemblage. Of the eight species that had the highest Index of Relative Importance (%IRI), five had higher variations (ANOVA F) between the day and night than between the months. This finding reinforced the need for sampling during both the day and night. The capéchade net effectively captured demersal and pelagic individuals in a broad range of sizes. R E S U M OA interpretação dos registros da comunidade ictíica têm se mostrado um desafio por diversos motivos, entre eles a falta de dados pretéritos, existência de variações temporais cíclicas na comunidade e pelos métodos utilizados que geralmente subamostram a assembleia. Neste sentido, o objetivo do presente trabalho foi descrever o padrão de variação temporal (nictemeral e mensal) na composição e na estrutura da ictiofauna de uma praia abrigada da Baía Norte de Florianópolis, usando uma rede capéchade. Coletas foram realizadas mensalmente, integrando um período de 48 horas/mês. Durante os meses de dezembro de 2010 a novembro de 2011, 19302 indivíduos distribuídos em 89 espécies e 39 famílias foram capturados. O número de indivíduos capturados durante o dia e/ou noite foi dependente do mês de coleta. Em média, a assembleia foi mais abundante durante o dia, diferindo em estrutura e composição do período da noite. Das oito espécies com maior Índice de Importância Relativa (IRI%), cinco apresentaram maior variação (F ANOVA) entre o dia e a noite do que a verificada entre os meses, o que reforça a necessidade de amostragens durante o dia e a noite. A rede capéchade foi eficiente na captura de indivíduos demersais e pelágicos com ampla faixa de tamanho.

Fish assemblages in a coastal bay adjacent to a network of marine protected areas in southern Brazil

“…The state of Santa Catarina has a strong fishing vocation but studies on fish assemblages on its coast are less common (MONTEIRO-NETO et al, 1990;RIBEIRO et al, 1997;BARREIRO et al, 2009, VILAR et al, 2011RIBEIRO et al, 2014). This study was, therefore, designed to fill the current information gap, as well as to contribute to the understanding of ecological processes involving the fish assemblage in the Baia Norte, a coastal bay adjacent to a network of Marine Protected Areas on the central coast of Santa Catarina State.…”

Spatial and temporal differences in the fish assemblage structure in a subtropical estuary

“…However, spatial and temporal assemblage patterns were not evaluated. Despite the dominance of a few species, which is a remarkable feature in lagoon and estuarine environments due to significant changes in physical and chemical variables (Day et al, 1989), there are differences in abundance between seasons and areas, commonly present in other surveys conducted in shallow areas (Spach et al, 2010;Contente et al, 2011;Vilar et al, 2011;Souza-Conceição et al, 2013;Cartagena et al, 2014;Ribeiro et al, 2014;Soeth et al, 2015;Cattani et al, 2016a). The use of such environments by juveniles, generally zoobenthivorous, is characterized by the availability of food associated with the substrate.…”

Fish species richness in shallow environments of the Island of Santa Catarina, Southern Brazil

“…Data of the Ratones Mangroves were obtained monthly in five sites (Figure 1, point C) from September to December 1997, January -December (except for February) 1998 and from February to May 1999, totaling 19 months of collection. In each month and site three cast The first took place from September to December 1997, January-December (except for February) 1998 and from February to May 1999; D) In the Itacorubi Mangrove, monthly samples between 1986 and 1989; E) In the Índio Beach, used data from Ribeiro et al (2014), fish were collected monthly between December 2010 and November 2011; F) In the Conceição Lagoon, samples were taken between 1981 and 1993. nets with the same diameter and different mesh sizes (45, 60 and 65 mm between adjacent knots, respectively) were cast 10 times, totaling 30 throws. Ten casts of a sweep (10 mm mesh size) were also used on the margins.…”

“…Still, we also used data from Ribeiro et al (2014) on fish collected at Índio Beach, in the northwestern of the island of Santa Catarina, on the shore of the North Bay (Figure 1, point E). In this study, fish were collected monthly between December 2010 and November 2011 in the first neap tide of each month with the help of a Fyke net (capéchade).…”

“…A) In the North Bay, seasonal samplings were conducted in 2005; B) In the Saco dos Limões, fish were sampled between February 2001 and December 2003; C) Data of the Ratones Mangroves were obtained by two samplings at different times. The first took place from September to December 1997, January-December (except for February) 1998 and from February to May 1999; D) In the Itacorubi Mangrove, monthly samples between 1986 and 1989; E) In the Índio Beach, used data fromRibeiro et al (2014), fish were collected monthly between December 2010 and November 2011; F) In the Conceição Lagoon, samples were taken between 1981 and 1993.…”