Preference, tolerance and resistance responses of Poecilia sphenops Valenciennes, 1846 (Pisces: Poeciliidae) to thermal fluctuations

Poecilia sphenops was acclimated to two thermal fluctuations, each following a symmetrical and asymmetrical cycle. The critical maximum temperatures of the fish were significantly different (P < 0.001) between the thermal fluctuations: 40°C for the 20-29°C thermal cycle and exceeding 42°C for the...

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Autores principales:	Hernández-Rodríguez,Mónica, Bückle-Ramirez,L. Fernando
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2010
Materias:	thermal fluctuations behaviour fishes Poecilia sphenops
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2010000300007
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spelling	oai:scielo:S0718-560X20100003000072010-11-18Preference, tolerance and resistance responses of Poecilia sphenops Valenciennes, 1846 (Pisces: Poeciliidae) to thermal fluctuationsHernández-Rodríguez,MónicaBückle-Ramirez,L. Fernando thermal fluctuations behaviour fishes Poecilia sphenops Poecilia sphenops was acclimated to two thermal fluctuations, each following a symmetrical and asymmetrical cycle. The critical maximum temperatures of the fish were significantly different (P < 0.001) between the thermal fluctuations: 40°C for the 20-29°C thermal cycle and exceeding 42°C for the 26-35°C cycles. Fish acclimated to the 20-29°C thermal cycle were more resistant to cold, with a critical thermal minimum of 10°C, unlike specimens of the 26-35°C regime, with a critical minimum of 11.7°C. In both cycles, the upper incipient lethal temperature interval was 38.8 to 39.5°C and the lower incipient lethal temperature interval was 10.8 to 11.8°C. Females preferred temperatures between 30 and 31°C, in all but the 26-35°C symmetric cycles. Males preferred a temperature between 23.8 and 24.2°C (symmetrical cycle). The high and low avoidance temperatures of male and female fish acclimated to the 20-29°C cycle were, respectively, 14 and 16°C, compared to the 26-35°C treatment, in which case these values were 8.4 and 11.4°C. The results indicate that P. sphenops is perfectly adapted to the marked seasons of rain and drought of their habitat.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=S0718-560X2010000300007en
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	thermal fluctuations behaviour fishes Poecilia sphenops
spellingShingle	thermal fluctuations behaviour fishes Poecilia sphenops Hernández-Rodríguez,Mónica Bückle-Ramirez,L. Fernando Preference, tolerance and resistance responses of Poecilia sphenops Valenciennes, 1846 (Pisces: Poeciliidae) to thermal fluctuations
description	Poecilia sphenops was acclimated to two thermal fluctuations, each following a symmetrical and asymmetrical cycle. The critical maximum temperatures of the fish were significantly different (P < 0.001) between the thermal fluctuations: 40°C for the 20-29°C thermal cycle and exceeding 42°C for the 26-35°C cycles. Fish acclimated to the 20-29°C thermal cycle were more resistant to cold, with a critical thermal minimum of 10°C, unlike specimens of the 26-35°C regime, with a critical minimum of 11.7°C. In both cycles, the upper incipient lethal temperature interval was 38.8 to 39.5°C and the lower incipient lethal temperature interval was 10.8 to 11.8°C. Females preferred temperatures between 30 and 31°C, in all but the 26-35°C symmetric cycles. Males preferred a temperature between 23.8 and 24.2°C (symmetrical cycle). The high and low avoidance temperatures of male and female fish acclimated to the 20-29°C cycle were, respectively, 14 and 16°C, compared to the 26-35°C treatment, in which case these values were 8.4 and 11.4°C. The results indicate that P. sphenops is perfectly adapted to the marked seasons of rain and drought of their habitat.
author	Hernández-Rodríguez,Mónica Bückle-Ramirez,L. Fernando
author_facet	Hernández-Rodríguez,Mónica Bückle-Ramirez,L. Fernando
author_sort	Hernández-Rodríguez,Mónica
title	Preference, tolerance and resistance responses of Poecilia sphenops Valenciennes, 1846 (Pisces: Poeciliidae) to thermal fluctuations
title_short	Preference, tolerance and resistance responses of Poecilia sphenops Valenciennes, 1846 (Pisces: Poeciliidae) to thermal fluctuations
title_full	Preference, tolerance and resistance responses of Poecilia sphenops Valenciennes, 1846 (Pisces: Poeciliidae) to thermal fluctuations
title_fullStr	Preference, tolerance and resistance responses of Poecilia sphenops Valenciennes, 1846 (Pisces: Poeciliidae) to thermal fluctuations
title_full_unstemmed	Preference, tolerance and resistance responses of Poecilia sphenops Valenciennes, 1846 (Pisces: Poeciliidae) to thermal fluctuations
title_sort	preference, tolerance and resistance responses of poecilia sphenops valenciennes, 1846 (pisces: poeciliidae) to thermal fluctuations
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=S0718-560X2010000300007
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Preference, tolerance and resistance responses of Poecilia sphenops Valenciennes, 1846 (Pisces: Poeciliidae) to thermal fluctuations

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