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Ecosystems

, Volume 20, Issue 5, pp 885–903 | Cite as

Ecosystem Oceanography of Seabird Hotspots: Environmental Determinants and Relationship with Antarctic Krill Within an Important Fishing Ground

  • Jarrod A. Santora
  • Richard R. Veit
  • Christian S. Reiss
  • Isaac D. Schroeder
  • Marc Mangel
Article

Abstract

The discipline of ecosystem oceanography provides a framework for assessing the role of mesoscale physical processes on the formation and occurrence of biological hotspots. We used shipboard surveys over nine years to investigate environmental determinants of seabird hotspots near the Antarctic Peninsula, a region experiencing rapid climate change and an expanding krill fishery. We hypothesize that seabird hotspots are structured by mesoscale ocean conditions that reflect differences in prey distribution within oceanic and coastal waters. We used generalized additive models to quantify functional relationships of seabird hotspots with krill biomass, and a suite of remotely sensed environmental variables, such as eddy kinetic energy. The spatial organization, changes in intensity, and distribution shifts of seabird hotspots indicate different environmental drivers within coastal and oceanic domains and reflect the seasonal variability of the ecosystem. Our results indicate at least eight mesoscale hotspot zones that represent ecologically important areas where significant krill and predator biomass may be concentrated. Our ecosystem assessment of seabird hotspots identified critical foraging habitat and provided reference points to benefit research on estimating their trophic impacts on Antarctic ecosystems and potential effects from the krill fishery. Our approach is generally applicable to other pelagic ecosystems that are structured by hydrographic fronts and eddies, and containing schooling forage species shared by multiple wide-ranging predators. Furthermore, identification of biological hotspots is useful for the designation of marine protected areas most critical to potentially endangered wildlife and fisheries resources.

Keywords

albatross conservation ecosystem assessment eddy kinetic energy krill fishery foraging ecology marine protected area mesoscale petrel spatial ecology storm petrel 

Notes

Acknowledgements

We are grateful for the help of the many participants of the NOAA-NMFS U.S. AMLR Program and G.M. Watters. This paper was greatly enhanced by feedback from several anonymous reviewers, and we are thankful for their constructive advice. This work was partially supported by the Center for Stock Assessment Research, a partnership between the Southwest Fisheries Science Center and the University of California, Santa Cruz.

Supplementary material

10021_2016_78_MOESM1_ESM.pdf (455 kb)
Supplementary material 1 (PDF 455 kb)

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Jarrod A. Santora
    • 1
  • Richard R. Veit
    • 2
    • 3
  • Christian S. Reiss
    • 4
  • Isaac D. Schroeder
    • 5
  • Marc Mangel
    • 1
    • 6
  1. 1.Department of Applied Mathematics and Statistics, Center for Stock Assessment ResearchUniversity of California Santa CruzSanta CruzUSA
  2. 2.Biology DepartmentCSI/CUNYStaten IslandUSA
  3. 3.CUNY Graduate CenterNew YorkUSA
  4. 4.Antarctic Ecosystem Research DivisionNOAA Southwest Fisheries Science CenterLa JollaUSA
  5. 5.Physical and Biological SciencesUniversity of California Santa CruzSanta CruzUSA
  6. 6.Department of BiologyUniversity of BergenBergenNorway

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