Open AccessCircadian rhythms and locomotor activity of smolts of the european river lamprey lampetra fluviatilis (l.)
Author(s) -
A. O. Zvezdin,
D. S. Pavlov,
A. V. Kucheryavyy,
И. А. Цимбалов
Publication year - 2019
Publication title -
doklady akademii nauk. rossijskaâ akademiâ nauk
Language(s) - English
Resource type - Journals
ISSN - 0869-5652
DOI - 10.31857/s0869-56524842243-246
Subject(s) - lampetra , lamprey , circadian rhythm , nocturnal , darkness , twilight , rhythm , morning , locomotor activity , biology , evening , period (music) , entrainment (biomusicology) , fishery , zoology , ecology , medicine , endocrinology , botany , physics , astronomy , acoustics
Locomotor activity was investigated in smolts of the European river lamprey at alternation of light and darkness (12/12 h) and in the dark. Two groups of smolts were discerned differing in the level of locomotor activity. The presence of the circadian rhythm in smolts has been revealed, and its role in downstream migration has been shown. The locomotor activity leading smolts to channel flow increases with decreasing illumination at evening twilight. The period of high nocturnal activity is completed a short time before morning twilight, under the action of the individual circadian rhythm. This decreases the probability of impact of predators on migrating smolts.