Using Environmental Variables to Predict the Structure of Deep-sea Arctic Fish Communities: Implications for Food Web Construction

• Published in: Arctic, antarctic, and alpine research Vol. 39; no. 1; pp. 2 - 8
• Main Authors: Chambers, Chandra A, Dick, Terry A
• Format: Journal Article
• Language: English
• Published: UCB 450, University of Colorado, Boulder, Colorado 80309-0450, U.S.A The Institute of Arctic and Alpine Research 01-02-2007; Taylor & Francis; Institute of Arctic and Alpine Research
• Subjects: Communities; Community structure; Contents; Food webs; Marine fishes; Ocean currents; Ocean fisheries; Species; Treble; Tropical regions; Water temperature
• ISSN: 1523-0430; 1938-4246
• DOI: 10.1657/1523-0430(2007)39[2:UEVTPT]2.0.CO;2

Understanding trophic interaction within deep-sea marine communities is critically important as commercial exploitation increases in the Arctic. Undoubtedly, the Arctic marine environment will be subject to the same environmental and human stressors as its southern counterparts and, as a result, community stability is vulnerable. The objectives of this study were to test the predictive power of environmental variables on fish community composition using redundancy analysis and to determine if this information could be used to differentiate distinct trophic communities throughout the Davis Strait/Baffin Bay region. This analysis used data collected in benthic surveys from 2000 to 2004, and results indicate that water temperature, latitude, and depth strongly influence the distribution of fish species in this region. Latitude and water temperature were strongly negatively correlated, and the majority of species were distributed along the low latitude/high temperature to high latitude/low temperature gradient. Some fish species were more highly correlated with depth. Proportions of most by-catch species differed between northern and southern regions at each depth range. Since community structure changes gradually along environmental gradients, perhaps it is more appropriate to describe the communities as shifting their trophic status along environmental gradients rather than as distinct communities with distinct food webs in a specific region of the Arctic.