Spatial and functional structure in populations of squid of the genus Berryteuthis in the Russian Far Eastern seas
https://doi.org/10.36038/2307-3497-2022-188-13-48
Abstract
The purpose of this study was to describe spatial and functional structure of geographic distribution areas for populations of squid of the genus Berryteuthis.
The research methods consist of the analysis of the squid biological characteristics and distribution according to conventional methods.
Results: Two species of the genus Berryteuthis inhabit the northwestern Pacific: the schoolmaster gonate squid B. magister and B. septemdentatus. Two B. magister populations, which live in the Bering and Okhotsk seas, are associated with the large-scaled marine circulations. A single population of B. septemdentatus inhabits the Sea of Japan. All Berryteuthis populations have similar traits in spatial organization. Extended spawning and feeding zones form the basis for distribution area of each population. These zones are geographically more or less separated from each other. Feeding zones are confined to high productivity areas.
Discussion: It was suggested that general direction of migrations in these two Berryteuthis species correspond to cyclonic circulations in the seas, where they occur. There are several migration routes within distribution area of each population, which correspond to local currents. Migration routes form a “migration net” in each population. Such a “migration net” along with extended breeding zones ensures the sustainability of populations and provide comfortable conditions for spawning, at least for a part of each generation.
The novelty of this research lies in generalized description of spatial and functional structure in Berryteuthis populations, and explanation of ecological life history strategy for all populations of the genus Berryteuthis.
Conclusion. Suggested general scheme for spatial organization of Berryteuthis populations is determined by a passive-nectonic ecological life form of these squid. The existence of these populations is related to the large-scale water circulations. Two populations of B. magister and one population of B. septemdentatus occur in the northwestern Pacific.
About the Author
D. O. Alexeyev
Russian Federal Research Institute of Fisheries and Oceanography («VNIRO»)
Russian Federation
Russian Federation
Dmitry O. Alexeyev
105187
19, Okruzhnoy proezd
Moscow
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For citations:
Alexeyev D.O. Spatial and functional structure in populations of squid of the genus Berryteuthis in the Russian Far Eastern seas. Trudy VNIRO. 2022;188:13-48. (In Russ.) https://doi.org/10.36038/2307-3497-2022-188-13-48
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