Dietary plasticity in small Arctic copepods as revealed with prey metabarcoding.

Autor:	Flo S; Department of Arctic and Marine Biology, Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway, Framstredet 39, 9019 Tromsø, Norway.; Department of Arctic Biology, The University Centre in Svalbard, PO Box 156, N-9171 Longyearbyen, Svalbard, Norway., Svensen C; Department of Arctic and Marine Biology, Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway, Framstredet 39, 9019 Tromsø, Norway., Præbel K; Department of Forestry and Wildlife Management, Inland Norway University of Applied Sciences, PO Box 400 Vestad, 2418 Elverum, Norway.; Norwegian College of Fishery Science, UiT The Arctic University of Norway, Muninbakken 21, 9037 Tromsø, Norway., Bluhm BA; Department of Arctic and Marine Biology, Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway, Framstredet 39, 9019 Tromsø, Norway., Vader A; Department of Arctic Biology, The University Centre in Svalbard, PO Box 156, N-9171 Longyearbyen, Svalbard, Norway.
Jazyk:	angličtina
Zdroj:	Journal of plankton research [J Plankton Res] 2024 Sep 05; Vol. 46 (5), pp. 500-514. Date of Electronic Publication: 2024 Sep 05 (Print Publication: 2024).
DOI:	10.1093/plankt/fbae042
Abstrakt:	Objectives: Small copepods (<2 mm) compose an important constituent of the Arctic marine food web, but their trophic interactions remain largely unexplored, partly due to methodological limitations. Methods: We here characterize the prey of the abundant cyclopoid Oithona similis , harpacticoid Microsetella norvegica and calanoid Microcalanus spp. from the Arctic Barents Sea and Nansen Basin during four seasons using brute force prey metabarcoding of the 18S rRNA gene. Key Findings: Chaetognaths were unexpectedly the most consistently identified taxa and composed 47% of all prey reads. Some taxa were seasonally important, including diatoms in April-May (43%), dinoflagellates in December (15%) and March (17%), and urochordates in August (20%). Compositional differences among species were also discernible, and the M. norvegica diet was significantly different from both O. similis and Microcalanus spp. The diets varied nevertheless more with season than species despite the inherent trophic traits that distinguish the ambush-predator O. similis , chemosensoric particle-chaser M. norvegica and current-feeding Microcalanus spp. Conclusions: Our results thus indicate that dietary plasticity is common in small Arctic copepods, regardless of their behaviors or strategies for finding sustenance. We further hypothesize that such plasticity is an important adaptation in systems where prey availability is highly seasonal. (© The Author(s) 2024. Published by Oxford University Press.)
Databáze:	MEDLINE
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