Affiliation:
1. Department of Arctic and Marine Biology UiT The Arctic University of Norway Tromsø Norway
2. Alfred‐Wegener Institute Helmholtz Center for Polar and Marine Research Bremerhaven Germany
3. Department of Biological Sciences University of Bergen Bergen Norway
4. Norwegian Institute for Nature Research Bergen Norway
Abstract
AbstractDuring the productive polar day, zooplankton and sea‐ice amphipods fulfill a critical role in energy transfer from primary producers to higher trophic‐level species in Arctic marine ecosystems. Recent polar night studies on zooplankton and sea‐ice amphipods suggest higher levels of biological activity than previously assumed. However, it is unknown if these invertebrates maintain polar night activity on stored lipids, opportunistic feeding, or a combination of both. To assess how zooplankton (copepods, amphipods, and krill) and sea‐ice amphipods support themselves on seasonally varying resources, we studied their lipid classes, fatty acid compositions, and compound‐specific stable isotopes of trophic biomarker fatty acids during polar day (June/July) and polar night (January). Lipid storage and fatty acid results confirm previously described dietary sources in all species during polar day. We found evidence of polar night feeding in all species, including shifts from herbivory to omnivory. Sympagic‐, pelagic‐, and Calanus spp.‐derived carbon sources supported zooplankton and sea‐ice amphipods in both seasons. We provide a first indication of polar night feeding of sea‐ice amphipods in the pelagic realm.
Funder
Tromsø Forskningsstiftelse
Subject
Aquatic Science,Oceanography
Cited by
1 articles.
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