MEPS 483:257-272 (2013)  -  DOI:

Modeling the influence of hypoxia on the potential habitat of Atlantic sturgeon Acipenser oxyrinchus: a comparison of two methods

Adam J. Schlenger1,*, Elizabeth W. North1, Zachary Schlag1, Yun Li1,5, David H. Secor2, Katharine A. Smith3, Edwin J. Niklitschek

1University of Maryland Center for Environmental Science, 2020 Horns Point Rd, Cambridge, Maryland 21613, USA
2University of Maryland, Center for Environmental Science, PO Box 38, Solomons, Maryland 20688, USA
3Department of Oceanography, University of Hawaii at Manoa, 1000 Pope Rd, Honolulu, Hawaii 96822, USA
4Universidad de Los Lagos, Centro i~mar, Camino a Chinquihue Km. 6, Puerto Montt 5480000, Chile
5Present address: NOAA/NMFS, Northeast Fishery Science Center, 166 Water Street, Woods Hole, Massachusetts 02543, USA

ABSTRACT: Management of marine and estuarine fish and shellfish would benefit from a numerical approach that quantifies the impacts of climate variability and eutrophication. We present a proof-of-concept habitat volume model that incorporates predictions from a 3-dimensional biophysical model. Using temperature, salinity, and dissolved oxygen, habitat volumes were calculated based on threshold physiological tolerances (fixed criteria) and potential growth (bioenergetics) for Atlantic sturgeon Acipenser oxyrinchus. Simulations from a coupled oxygen and hydrodynamic model of the Chesapeake Bay, USA, were used to estimate habitat volumes of juvenile sturgeon and assess the sensitivity of habitat to environmental factors. In winter, salinity controlled the required (needed for survival) and optimal (needed for highest growth) habitat. Temperature and salinity defined spring and autumn optimal habitat, and a combination of salinity, temperature and dissolved oxygen influenced habitat volumes during summer. Although average summertime oxygen limitation reduced the volumes of juvenile habitat by 3.3-28.0%, the largest reductions in summertime habitat resulted from temperature limitation. The average difference in annual and seasonal volumes between fixed-criteria and bioenergetics methods was approximately 14%, with similar trends over the annual cycle for most life stages and habitat types. We conclude that fixed-criteria habitat volume models would be suitable when bioenergetics information is not available. Both habitat volume models can be used to assess the impacts of climate change and eutrophication on the habitat of fish and shellfish in regions where hydrodynamic models exist and for species for which physiological tolerances are known.

KEY WORDS: Habitat · Model · Biophysical · Hypoxia · Atlantic sturgeon · Physiological tolerance · Oxygen model

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Cite this article as: Schlenger AJ, North EW, Schlag Z, Li Y, Secor DH, Smith KA, Niklitschek EJ (2013) Modeling the influence of hypoxia on the potential habitat of Atlantic sturgeon Acipenser oxyrinchus: a comparison of two methods. Mar Ecol Prog Ser 483:257-272.

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