Journal
GLOBAL CHANGE BIOLOGY
Volume 24, Issue 1, Pages E159-E170Publisher
WILEY
DOI: 10.1111/gcb.13890
Keywords
Arctic Ocean; biogeography; climate change; copepod; individual-based model; marine ecosystem; ocean warming; poleward range shift
Funding
- Division of Polar Programs [PLR-1416920, PLR-1417339, PLR-1417677]
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1416920] Funding Source: National Science Foundation
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Dramatic changes have occurred in the Arctic Ocean over the past few decades, especially in terms of sea ice loss and ocean warming. Those environmental changes may modify the planktonic ecosystem with changes from lower to upper trophic levels. This study aimed to understand how the biogeographic distribution of a crucial endemic copepod species, Calanus glacialis, may respond to both abiotic (ocean temperature) and biotic (phytoplankton prey) drivers. A copepod individual-based model coupled to an ice-ocean-biogeochemical model was utilized to simulate temperature-and food-dependent life cycle development of C. glacialis annually from 1980 to 2014. Over the 35-year study period, the northern boundaries of modeled diapausing C. glacialis expanded poleward and the annual success rates of C. glacialis individuals attaining diapause in a circumpolar transition zone increased substantially. Those patterns could be explained by a lengthening growth season (during which time food is ample) and shortening critical development time (the period from the first feeding stage N3 to the diapausing stage C4). The biogeographic changes were further linked to large-scale oceanic processes, particularly diminishing sea ice cover, upper ocean warming, and increasing and prolonging food availability, which could have potential consequences to the entire Arctic shelf/slope marine ecosystems.
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