Data/hora: 01/06/2024 01:14:12

Provedor de dados: | 88
País: | Brazil
Título: | Patterns of spatial distribution in macroalgal communities from tropical lotic ecosystems
Autores: | Borges,Fábio R.; Necchi Júnior,Orlando.
Data: | 2006-12-01
Ano: | 2006
Palavras-chave: | Distribution; Ecological niche; Lotic ecosystem; Macroalga; Tropical region.
Resumo: | Three sampling sites were analysed in each of the following tropical regions: 1) northwestern São Paulo State, representing a disturbed region; 2) Bonito, Mato Grosso do Sul State, representing a hard water region; and 3) Ubatuba, northern costal region of São Paulo State, a well preserved tropical rainforest region. The hard water region had the highest mean values for macroalgal species richness (6.3) and diversity index (H' = 0.62). Northwest and rainforest regions had the highest percent cover values (22.5% and 17.0%, respectively). All sites in the northwest region had one or two dominant species (percent cover significantly higher than the remaining species), characterizing the niche pre-emption distribution pattern. The same pattern was found in two sites of the Atlantic rainforest. The hard water region had dominance of one species in two out of the three sites, but differently from the northwest region, niche overlap values were lower, evidencing a patch distribution. Competition for space was one of the main factors to explain spatial distribution. Overall, sites characterized by niche pre-emption had lower species richness, higher values for niche width and overlap, dominance index and percent cover of dominant species. In contrast, sites characterized by patch distribution had higher species richness and lower values for niche overlap and width, dominance index and percent cover.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042006000400016
Editor: | Sociedade Botânica de São Paulo
Relação: | 10.1590/S0100-84042006000400016
Formato: | text/html
Fonte: | Brazilian Journal of Botany  v.29 n.4 2006
Fonte: | info:eu-repo/semantics/openAccess