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Ecological niche modeling of sympatric krill predators around Marguerite Bay, Western Antarctic Peninsula

Publication ,  Journal Article
Friedlaender, AS; Johnston, DW; Fraser, WR; Burns, J; Patrick N., H; Costa, DP
Published in: Deep-Sea Research Part II: Topical Studies in Oceanography
July 1, 2011

Adélie penguins (. Pygoscelis adeliae), carabeater seals (. Lobodon carcinophagus), humpback (. Megaptera novaeangliae), and minke whales (. Balaenoptera bonaernsis) are found in the waters surrounding the Western Antarctic Peninsula. Each species relies primarily on Antarctic krill (. Euphausia superba) and has physiological constraints and foraging behaviors that dictate their ecological niches. Understanding the degree of ecological overlap between sympatric krill predators is critical to understanding and predicting the impacts on climate-driven changes to the Antarctic marine ecosystem. To explore ecological relationships amongst sympatric krill predators, we developed ecological niche models using a maximum entropy modeling approach (Maxent) that allows the integration of data collected by a variety of means (e.g. satellite-based locations and visual observations). We created spatially explicit probability distributions for the four krill predators in fall 2001 and 2002 in conjunction with a suite of environmental variables. We find areas within Marguerite Bay with high krill predator occurrence rates or biological hot spots. We find the modeled ecological niches for Adélie penguins and crabeater seals may be affected by their physiological needs to haul-out on substrate. Thus, their distributions may be less dictated by proximity to prey and more so by physical features that over time provide adequate access to prey. Humpback and minke whales, being fully marine and having greater energetic demands, occupy ecological niches more directly proximate to prey. We also find evidence to suggest that the amount of overlap between modeled niches is relatively low, even for species with similar energetic requirements. In a rapidly changing and variable environment, our modeling work shows little indication that krill predators maintain similar ecological niches across years around Marguerite Bay. Given the amount of variability in the marine environment around the Antarctic Peninsula and how this affects the local abundance of prey, there may be consequences for krill predators with historically little niche overlap to increase the potential for interspecific competition for shared prey resources. © 2010 Elsevier Ltd.

Duke Scholars

Published In

Deep-Sea Research Part II: Topical Studies in Oceanography

DOI

ISSN

0967-0645

Publication Date

July 1, 2011

Volume

58

Issue

13-16

Start / End Page

1729 / 1740

Related Subject Headings

  • Oceanography
  • 3708 Oceanography
  • 3103 Ecology
  • 0602 Ecology
  • 0405 Oceanography
  • 0402 Geochemistry
 

Citation

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ICMJE
MLA
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Friedlaender, A. S., Johnston, D. W., Fraser, W. R., Burns, J., Patrick N., H., & Costa, D. P. (2011). Ecological niche modeling of sympatric krill predators around Marguerite Bay, Western Antarctic Peninsula. Deep-Sea Research Part II: Topical Studies in Oceanography, 58(13–16), 1729–1740. https://doi.org/10.1016/j.dsr2.2010.11.018
Friedlaender, A. S., D. W. Johnston, W. R. Fraser, J. Burns, H. Patrick N., and D. P. Costa. “Ecological niche modeling of sympatric krill predators around Marguerite Bay, Western Antarctic Peninsula.” Deep-Sea Research Part II: Topical Studies in Oceanography 58, no. 13–16 (July 1, 2011): 1729–40. https://doi.org/10.1016/j.dsr2.2010.11.018.
Friedlaender AS, Johnston DW, Fraser WR, Burns J, Patrick N. H, Costa DP. Ecological niche modeling of sympatric krill predators around Marguerite Bay, Western Antarctic Peninsula. Deep-Sea Research Part II: Topical Studies in Oceanography. 2011 Jul 1;58(13–16):1729–40.
Friedlaender, A. S., et al. “Ecological niche modeling of sympatric krill predators around Marguerite Bay, Western Antarctic Peninsula.” Deep-Sea Research Part II: Topical Studies in Oceanography, vol. 58, no. 13–16, July 2011, pp. 1729–40. Scopus, doi:10.1016/j.dsr2.2010.11.018.
Friedlaender AS, Johnston DW, Fraser WR, Burns J, Patrick N. H, Costa DP. Ecological niche modeling of sympatric krill predators around Marguerite Bay, Western Antarctic Peninsula. Deep-Sea Research Part II: Topical Studies in Oceanography. 2011 Jul 1;58(13–16):1729–1740.
Journal cover image

Published In

Deep-Sea Research Part II: Topical Studies in Oceanography

DOI

ISSN

0967-0645

Publication Date

July 1, 2011

Volume

58

Issue

13-16

Start / End Page

1729 / 1740

Related Subject Headings

  • Oceanography
  • 3708 Oceanography
  • 3103 Ecology
  • 0602 Ecology
  • 0405 Oceanography
  • 0402 Geochemistry