Circadian rhythms and photic entrainment of swimming activity in cave-dwelling fishAstyanax mexicanus(Actinopterygii: Characidae), from El Sotano La Tinaja, San Luis Potosi, Mexico

Autor:	Itzel Sigala-Regalado, Juan B. Morales-Malacara, Omar Caballero-Hernández, Manuel Miranda-Anaya, Miguel Hernández-Patricio
Rok vydání:	2015
Předmět:	geography geography.geographical_feature_category biology Physiology Ecology Actinopterygii biology.organism_classification Cave dwelling Characidae Rhythm Cave Physiology (medical) Fish Circadian rhythm Tinaja Ecology Evolution Behavior and Systematics
Zdroj:	Biological Rhythm Research. 46:579-586
ISSN:	1744-4179 0929-1016
DOI:	10.1080/09291016.2015.1034972
Popis:	Circadian regulation has a profound adaptive meaning in timing the best performance of biological functions in a cyclic niche. However, in cave-dwelling animals (troglobitic), a lack of photic cyclic environment may represent a disadvantage for persistence of circadian rhythms. There are different populations of cave-dwelling fish Astyanax mexicanus in caves of the Sierra El Abra, Mexico, with different evolutive history. In the present work, we report that fish collected from El Sotano la Tinaja show circadian rhythms of swimming activity in laboratory conditions. Rhythms observed in some of the organisms entrain to either continuous light–dark cycles or discrete skeleton photoperiods tested. Our results indicate that circadian rhythm of swimming activity and their ability to entrain in discrete and continuous photoperiods persist in some organisms that might represent one of the oldest populations of cave-dwelling A. mexicanus in the Sierra El Abra.
Databáze:	OpenAIRE
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