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61.
Rodrigo Petry Corrêa de Sousa Jaymeson Lielson Anjos dos Santos Gláucia Caroline Silva-Oliveira Ivanete de Oliveira Furo Edivaldo Herculano Corrêa de Oliveira Marcelo Vallinoto 《Journal of fish biology》2023,102(2):520-524
Although Astyanax bimaculatus is the most representative species of the genus in the Amazon region, there are no cytogenetic studies of A. bimaculatus species in Amazon region. Thus, we aimed to analyse the chromosome complements of specimens from this area using classic and molecular cytogenetic approaches. The results revealed the existence of a distinct cytotype and this is the first report of the occurrence of a B microchromosome in the species. Overall, these data indicate that the karyotypic evolution of this species is complex, involving the occurrence of chromosomal rearrangements. 相似文献
62.
Omar Caballero-Hernández Miguel Hernández-Patricio Itzel Sigala-Regalado Juan B. Morales-Malacara 《Biological Rhythm Research》2015,46(4):579-586
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 Sótano 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. 相似文献