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

Mónica Hernández-Rodríguez, L. Fernando Bückle-Ramirez


DOI: https://doi.org/10.3856/vol38-issue3-fulltext-7

Abstract


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 20-29ºC thermal cycle and exceeding 42°C for the 26- 35ºC cycle. Fish acclimated to the 20-29ºC thermal cycle were more resistant to cold, with a critical thermal minimum of 10ºC, unlike specimens of the 26-35ºC regime, with a critical minimum of 11.7°C. In both cycles, the upper incipient lethal temperature interval was 38.8 to 39.5ºC 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 26-35ºC symmetric cycle. 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 20-29ºC cycle were, respectively, 14 and 16ºC, compared to the 26-35°C treatment, in which case these values were 8.4 and 11.4ºC. The results indicate that P. sphenops is perfectly adapted to the marked seasons of rain and drought of their habitat.


Hernández-Rodríguez M, Bückle-Ramirez L. Preference, tolerance and resistance responses of Poecilia sphenops Valenciennes, 1846 (Pisces: Poeciliidae) to thermal fluctuations. Lat. Am. J. Aquat. Res.. 2011;38(3): 427-437. Available from: doi:10.3856/vol38-issue3-fulltext-7 [Accessed 22 Apr. 2019].
Hernández-Rodríguez, M., & Bückle-Ramirez, L. (2011). Preference, tolerance and resistance responses of Poecilia sphenops Valenciennes, 1846 (Pisces: Poeciliidae) to thermal fluctuations. Latin American Journal of Aquatic Research, 38(3), 427-437. doi:http://dx.doi.org/10.3856/vol38-issue3-fulltext-7