Meiofauna distribution in a tropical estuary of the South-Western Atlantic(Brazil)

Citation
Ag. Dalto et Ef. Albuquerque, Meiofauna distribution in a tropical estuary of the South-Western Atlantic(Brazil), VIE MILIEU, 50(3), 2000, pp. 151-162
Citations number
35
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
VIE ET MILIEU-LIFE AND ENVIRONMENT
ISSN journal
0240-8759 → ACNP
Volume
50
Issue
3
Year of publication
2000
Pages
151 - 162
Database
ISI
SICI code
0240-8759(200009)50:3<151:MDIATE>2.0.ZU;2-F
Abstract
The horizontal distribution and abundance of metazoan meiofauna in relation to environmental variables were examined at 10 stations in the Jacuacanga Bay (Rio de Janeiro, Southeastern Brazil), at two seasons of the year (rain y and dry). Samples were obtained from 9 and 17 m depth. Environmental and biological variables were sampled by SCUBA diving and with a van Veen grab. Principal Component Analysis, Canonical Correspondence Analysis, SIMPER an d Hierarchical Clustering were used to describe and evaluate associations o f variables and samples. Meiofauna was composed by 22 faunistic groups, wit h mean densities varying from 1425 to 5226 ind. 10 cm(-2). The highest valu es were observed during the rainy saison, The communities were dominated by nematodes, followed by copepods. Statistical analysis showed that the main environmental variables influencing the meiofauna distribution were: coars e silt, dissolved oxygen, organic carbon, C/N ratio and depth. The dissimil arity between the stations can be explained by nematodes, copepods, rotifer s, ostracodes and kinorhynchs. The comparison between rainy and dry seasons revealed the existence of temporal variability related to seasonal inputs of organic matter into the benthos.