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Biodiversity of Estuarine Fish Faunas in West Africa OceanDocs
Baran, E..
In West Africa (between Ivory Coast and Sénégal), estuarine environments vary from lagoons to high discharge rivers to inverse hypersaline estuaries. This results in a high diversity of estuarine fish species, with an important turnover and a core of ubiquitous species. The species richness of a given estuary depends on the combination of hydrological factors (marine or freshwater dominance) and biogeography (continental biogeographic regions). The catch rate is higher in lagoons and inverse estuaries than in normal estuaries, which can be explained by the predominance of small juveniles in the latter. Clupeids are the most abundant fishes all over the region, but different systems have different dominant species. Assessing the functioning of West-African...
Tipo: Journal Contribution Palavras-chave: Biodiversity; Aquatic fauna; Estuarine fish.
Ano: 2000 URL: http://hdl.handle.net/1834/666
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Spatial choice is biased by chemical cues from conspecifics in the speckeled worm eel Myrophis punctatus Neotropical Ichthyology
Barreto,Rodrigo Egydio; Junqueira,Maria Fernanda Coelho; Tjui-Yeuw,Tan; Volpato,Gilson Luiz.
The speckeld worm eel Myrophis punctatus lives in high-densities assemblages, and usually digs through, or lies on the substrate. These behaviours could lead to chemical marks on the substrate and could modulate the spatial distribution in this species. We tested the hypothesis that the spatial choice of the speckled worm eel is modulated by the presence of conspecific odour on the substrate. Here, we showed that the speckled worm eel avoids the substrate area containing the conspecific odour, indicating that this chemical cue modulates the eel's spatial decision. The eels clearly detected the conspecific's odour. This perception might indicate the presence of conspecifics into the substrate. Since the eels avoided an area containing conspecific odour, we...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chemical communication; Chemoreception; Estuarine fish; Territoriality; Aggression.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000400021
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Total mercury in the fish Trichiurus lepturus from a tropical estuary in relation to length, weight, and season Neotropical Ichthyology
Barbosa,Scheyla C. T; Costa,Monica F; Barletta,Mário; Dantas,David Valença; Kehrig,Helena A; Malm,Olaf.
The Goiana River Estuary (7º30'S 34º47'W) is a typical estuary of the semi-arid tropical regions. This estuary shelters a rich fauna of fish, crustaceans and mollusks which play an important role in the life of traditional populations. It is also the main recipient of the effluents from the sugarcane agro-industry and sewage from settlements and villages. Trichiurus lepturus (n = 104), from the Goiana Estuary were examined for total mercury contents during ten months (2005 to 2007) spaning two dry seasons and part of a rainy season. The studied individuals showed weight (W) (204.1±97.9 g) and total length (TL) (63.1±10.1 cm, range 29.5-89.0 cm) with a significant (p<0.05) correlation. Correlation between TL and Hg-T (r = 0.37286) and between W and Hg-T...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Estuarine fish; Mercury bioavailability; Risk assessment; Seasonal changes; Trichiuridae.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000100018
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