Diel and tidal variation in surf zone fish assemblages of a sheltered beach in southern Brazil

Diel and tidal variations of fish assemblages were assessed at Pontal beach, southern Brazil, using a seine net. Species richness was greater at night, whereas fish number, weight, and richness (cornmunity indicators) were all influenced by the tidal state. Samples from rising tides were more repres...

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Autores principales:	Félix-Hackradt,Fabiana C, Spach,Henry L, Moro,Pietro S, Pichler,Helen A, Maggi,Aline S, Hostim-Silva,Mauricio, Hackradt,Carlos W
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2010
Materias:	diel cycle tidal dynamics species pattern predators shoals southern Brazil
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2010000300009
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spelling	oai:scielo:S0718-560X20100003000092010-11-18Diel and tidal variation in surf zone fish assemblages of a sheltered beach in southern BrazilFélix-Hackradt,Fabiana CSpach,Henry LMoro,Pietro SPichler,Helen AMaggi,Aline SHostim-Silva,MauricioHackradt,Carlos W diel cycle tidal dynamics species pattern predators shoals southern Brazil Diel and tidal variations of fish assemblages were assessed at Pontal beach, southern Brazil, using a seine net. Species richness was greater at night, whereas fish number, weight, and richness (cornmunity indicators) were all influenced by the tidal state. Samples from rising tides were more representative, probably due to onshore fish movements for feeding purposes. However, lower catches were associated with high tides, mainly through net avoidance, indicating that sampling in these conditions is not highly informative. Clupeoids exhibited greater variation in a 24 h period, and the night occurrence of A. tricolor and daylight shoaling of Harengula clupeola, Anchoa parva and Sardinella brasiliensis suggested distinct strategies for avoiding daylight predators. In some species, this behaviour may have been induced by the bottom morphology and tidal state, facilitating nearshore grouping. In addition to being caught at night, the occurrences of Menticirrhus littoralis, Pomadasys corvinaefórmis, Umbrina coroides and Hyporhamphus unifasciatus indicated a spatial niche partition according to tidal state. Although not evaluated properly, temporal fluctuations could reflect species recruitment patterns. Seasonal fluctuations have to be considered when analysing short-term changes in the cornmunity as such fluctuations are synchronized with the natural history of the species, making it difficult to interpret short-term variations in isolation.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.38 n.3 20102010-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2010000300009en
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	diel cycle tidal dynamics species pattern predators shoals southern Brazil
spellingShingle	diel cycle tidal dynamics species pattern predators shoals southern Brazil Félix-Hackradt,Fabiana C Spach,Henry L Moro,Pietro S Pichler,Helen A Maggi,Aline S Hostim-Silva,Mauricio Hackradt,Carlos W Diel and tidal variation in surf zone fish assemblages of a sheltered beach in southern Brazil
description	Diel and tidal variations of fish assemblages were assessed at Pontal beach, southern Brazil, using a seine net. Species richness was greater at night, whereas fish number, weight, and richness (cornmunity indicators) were all influenced by the tidal state. Samples from rising tides were more representative, probably due to onshore fish movements for feeding purposes. However, lower catches were associated with high tides, mainly through net avoidance, indicating that sampling in these conditions is not highly informative. Clupeoids exhibited greater variation in a 24 h period, and the night occurrence of A. tricolor and daylight shoaling of Harengula clupeola, Anchoa parva and Sardinella brasiliensis suggested distinct strategies for avoiding daylight predators. In some species, this behaviour may have been induced by the bottom morphology and tidal state, facilitating nearshore grouping. In addition to being caught at night, the occurrences of Menticirrhus littoralis, Pomadasys corvinaefórmis, Umbrina coroides and Hyporhamphus unifasciatus indicated a spatial niche partition according to tidal state. Although not evaluated properly, temporal fluctuations could reflect species recruitment patterns. Seasonal fluctuations have to be considered when analysing short-term changes in the cornmunity as such fluctuations are synchronized with the natural history of the species, making it difficult to interpret short-term variations in isolation.
author	Félix-Hackradt,Fabiana C Spach,Henry L Moro,Pietro S Pichler,Helen A Maggi,Aline S Hostim-Silva,Mauricio Hackradt,Carlos W
author_facet	Félix-Hackradt,Fabiana C Spach,Henry L Moro,Pietro S Pichler,Helen A Maggi,Aline S Hostim-Silva,Mauricio Hackradt,Carlos W
author_sort	Félix-Hackradt,Fabiana C
title	Diel and tidal variation in surf zone fish assemblages of a sheltered beach in southern Brazil
title_short	Diel and tidal variation in surf zone fish assemblages of a sheltered beach in southern Brazil
title_full	Diel and tidal variation in surf zone fish assemblages of a sheltered beach in southern Brazil
title_fullStr	Diel and tidal variation in surf zone fish assemblages of a sheltered beach in southern Brazil
title_full_unstemmed	Diel and tidal variation in surf zone fish assemblages of a sheltered beach in southern Brazil
title_sort	diel and tidal variation in surf zone fish assemblages of a sheltered beach in southern brazil
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2010
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2010000300009
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_version_	1714205074461294592

Diel and tidal variation in surf zone fish assemblages of a sheltered beach in southern Brazil

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