Gjøkvatn revisited: Repeated visual observations of plankton swarms in a subarctic forest lake

Distinct swarms of Bosmina longispina (Leydig, 1860) (Crustacea: Cladocera) were visually observed and described in Gjøkvatn, a Norwegian forest lake at 69°N, in 1969 and again in 1996 and 2021. The repeated observations after many years show that Bosmina swarms occur regularly in the lake. The swar...

Full description

Bibliographic Details
Published in:Journal of Crustacean Biology
Main Author: Klemetsen, Anders
Format: Article in Journal/Newspaper
Language:English
Published: Oxford University Press 2022
Subjects:
Online Access:https://hdl.handle.net/10037/26660
https://doi.org/10.1093/jcbiol/ruac011
Description
Summary:Distinct swarms of Bosmina longispina (Leydig, 1860) (Crustacea: Cladocera) were visually observed and described in Gjøkvatn, a Norwegian forest lake at 69°N, in 1969 and again in 1996 and 2021. The repeated observations after many years show that Bosmina swarms occur regularly in the lake. The swarming is likely to be an anti-predation behaviour against the predatory cladoceran Polyphemus pediculus (Linnaeus, 1761).