Data/hora: 09/06/2024 19:05:44

Provedor de dados: | 83
País: | Brazil
Título: | Fish assemblages of tropical floodplain lagoons: exploring the role of connectivity in a dry year
Autores: | Petry,Ana Cristina; Agostinho,Angelo Antonio; Gomes,Luiz Carlos.
Data: | 2003-12-01
Ano: | 2003
Palavras-chave: | Neotropical fishes; Fish assemblage structure; Hydrological connectivity; Floodplain.
Resumo: | Irregular rainfall and pronounced reductions of the hydrometric level in the year 2000 resulted in drastically altered hydrological connectivity of lentic environments in the upper Paraná River floodplain. The objective of the present work was to examine spatial and temporal patterns of fish assemblage attributes and structure in relation to limnological variables associated with hydrological connectivity. Fish were collected quarterly by seining in the marginal areas of 15 lagoons belonging to two biotopic categories (connected and disconnected). Variation in assemblage composition reflected the degree of hydrological connectivity. Values of assemblage attributes (species richness, density and biomass) were significantly lower in connected lagoons than in disconnected lagoons. Significantly higher values of species richness and biomass were recorded in November than in August. Rare species had the greatest effect on observed patterns in fish assemblage ordination (DCA). Observed patterns of variation in assemblage attributes were directly correlated with factors related to hydrological connectivity, such as depth, resources (zooplankton and chlorophyll a) and nutrients (total phosphorus).
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252003000200005
Editor: | Sociedade Brasileira de Ictiologia
Relação: | 10.1590/S1679-62252003000200005
Formato: | text/html
Fonte: | Neotropical Ichthyology  v.1 n.2 2003
Fonte: | info:eu-repo/semantics/openAccess