Unusual Thermoregulatory Behavior of Anadromous and Resident Larvae of the River Lamprey Lampetra fluviatilis (Petromyzontidae)


The results of studying the thermal tolerance and thermoregulatory behavior of the river lamprey larvae Lampetra fluviatilis (L.) have been reported. The upper lethal temperatures, recorded at a waterheating rate of ~8°C/h–1 and acclimation temperature of 18°C, do not differ in the specimens regarded as descendants derived from the ancestors of anadromous and resident life forms, comprising 34.3 and 34.5°C, respectively (p > 0.05). In addition, no significant differences in the temperatures preferred by larvae from the populations of different life strategies are revealed. These individuals do not show any distinct thermal preferendum, distributing across the thermal gradient field presented to them. The mean values for the preferred temperatures on each day of a 3-day experiment comprised 18.3, 19.3, and 19.8°C.

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We are grateful to N.S. Nekrutov for his assistance in performing the experiments.


This study was carried out as part of State Task no. АААА-А18-18012690102-9 (Experimental Work) with financial support from the Russian Science Foundation (project no.19–14–00015, analyzing the survey result and writing an article).

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Correspondence to A. K Smirnov.

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Conflict of interests. The authors declare that they have no conflict of interests.

Statement of welfare of animals. All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. The article does not concern any research using animals as objects.

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Translated by O. Zhiryakova

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Smirnov, A.K., Golovanov, V.K., Zvezdin, A.O. et al. Unusual Thermoregulatory Behavior of Anadromous and Resident Larvae of the River Lamprey Lampetra fluviatilis (Petromyzontidae). Inland Water Biol 13, 648–654 (2020). https://doi.org/10.1134/S1995082920060127

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  • life strategies
  • river lamprey Lampetra fluviatilis
  • ammocoetes
  • larvae
  • upper lethal temperature
  • preferred temperature