Early ice retreat and ocean warming may induce copepod biogeographic boundary shifts in the Arctic Ocean
Campbell, Robert G.
Ashjian, Carin J.
MetadataShow full item record
KeywordArctic Ocean; Marine ecosystem; Climate change; Biogeography; Individual-based model; C. glacialis
Early ice retreat and ocean warming are changing various facets of the Arctic marine ecosystem, including the biogeographic distribution of marine organisms. Here an endemic copepod species, Calanus glacialis, was used as a model organism, to understand how and why Arctic marine environmental changes may induce biogeographic boundary shifts. A copepod individual-based model was coupled to an ice-ocean-ecosystem model to simulate temperature- and food-dependent copepod life history development. Numerical experiments were conducted for two contrasting years: a relatively cold and normal sea ice year (2001) and a well-known warm year with early ice retreat (2007). Model results agreed with commonly known biogeographic distributions of C. glacialis, which is a shelf/slope species and cannot colonize the vast majority of the central Arctic basins. Individuals along the northern boundaries of this species' distribution were most susceptible to reproduction timing and early food availability (released sea ice algae). In the Beaufort, Chukchi, East Siberian, and Laptev Seas where severe ocean warming and loss of sea ice occurred in summer 2007, relatively early ice retreat, elevated ocean temperature (about 1–2°C higher than 2001), increased phytoplankton food, and prolonged growth season created favorable conditions for C. glacialis development and caused a remarkable poleward expansion of its distribution. From a pan-Arctic perspective, despite the great heterogeneity in the temperature and food regimes, common biogeographic zones were identified from model simulations, thus allowing a better characterization of habitats and prediction of potential future biogeographic boundary shifts.
Author Posting. © American Geophysical Union, 2016. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 121 (2016): 6137-6158, doi:10.1002/2016JC011784.
Showing items related by title, author, creator and subject.
Recent advances in Arctic ocean studies employing models from the Arctic Ocean Model Intercomparison Project Proshutinsky, Andrey; Aksenov, Yevgeny; Kinney, Jaclyn Clement; Gerdes, Rudiger; Golubeva, Elena; Holland, David; Holloway, Greg; Jahn, Alexandra; Johnson, Mark; Popova, Ekaterina E.; Steele, Michael; Watanabe, Eiji (Oceanography Society, 2011-09)Observational data show that the Arctic Ocean has significantly and rapidly changed over the last few decades, which is unprecedented in the observational record. Air and water temperatures have increased, sea ice volume ...
A land-to-ocean perspective on the magnitude, source and implication of DIC flux from major Arctic rivers to the Arctic Ocean Tank, Suzanne E.; Raymond, Peter A.; Striegl, Robert G.; McClelland, James W.; Holmes, Robert M.; Fiske, Gregory J.; Peterson, Bruce J. (American Geophysical Union, 2012-12-14)A series of seasonally distributed measurements from the six largest Arctic rivers (the Ob', Yenisey, Lena, Kolyma, Yukon and Mackenzie) was used to examine the magnitude and significance of Arctic riverine DIC flux to ...
Yang, Jiayan (American Meteorological Society, 2005-12)According to observations, the Arctic Ocean circulation beneath a shallow thermocline can be schematized by cyclonic rim currents along shelves and over ridges. In each deep basin, the circulation is also believed to be ...