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Marine Ecology Progress Series

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MEPS 444:155-173 (2012)  -  DOI:

Predicting the effects of freshwater diversions on juvenile brown shrimp growth and production: a Bayesian-based approach

Aaron T. Adamack1,5,*, Craig A. Stow2, Doran M. Mason2, Lawrence P. Rozas3, Thomas J. Minello4

1Cooperative Institute for Limnology and Ecosystems Research, University of Michigan, Ann Arbor, Michigan 48108, USA
2NOAA Great Lakes Environmental Research Laboratory, Ann Arbor, Michigan 48108, USA
3NOAA National Marine Fisheries Service/SEFSC, Estuarine Habitats and Coastal Fisheries Center, Lafayette, Louisiana 70506, USA
4NOAA National Marine Fisheries Service/SEFSC, Galveston Laboratory, Galveston, Texas 77551, USA
5Present address: Institute for Applied Ecology, University of Canberra, Canberra, ACT 2601, Australia

ABSTRACT: Freshwater diversions from the Mississippi River may help restore coastal wetlands in Louisiana, but their implementation will alter temperature and salinity regimes, potentially affecting juvenile shrimp growth and production. We developed a bioenergetics model for brown shrimp Farfantepenaeus aztecus to investigate water temperature and salinity effects on brown shrimp growth. The model used a Bayesian framework that provided estimates of parameter and model uncertainty. Temperature affected shrimp metabolism, whereas salinity modified food availability. Mortality was modeled using a size-dependent function. We examined the effects of diversion timing (February, March, April and May), length (2× 14, as well as 30 and 60 d), temperature change (+1, 0, −1, −5 and –10°C), initial salinity (5, 15, 25), salinity during the diversion (2, 5, 10, 15, 20 and 25) and prey biomass response time (7, 14 and 28 d) on juvenile brown shrimp production. Diversions during February and March had little effect on shrimp, but 30 and 60 d diversions starting in April and May often had large, negative effects on production. April and May diversions that dropped water temperature by 5°C or more could decrease juvenile brown shrimp production by 40 to 60% compared with the baseline, no diversion scenarios. Whether changes in salinity had a positive or negative effect on brown shrimp production depended on the initial salinity of the scenario. Longer diversions and slower prey response times extended the duration brown shrimp were exposed to either the positive or negative effects of diversions, and this ­magnified the overall (positive or negative) effect on shrimp production. Limiting diversions to February and March when brown shrimp populations are not abundant would minimize negative effects on shrimp production, though managers will be constrained by the needs of other species such as oysters, as well as ecosystem considerations.

KEY WORDS: Farfantepenaeus aztecus · Restoration · Salt marsh · Freshwater diversion · Mississippi River · Louisiana

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Cite this article as: Adamack AT, Stow CA, Mason DM, Rozas LP, Minello TJ (2012) Predicting the effects of freshwater diversions on juvenile brown shrimp growth and production: a Bayesian-based approach. Mar Ecol Prog Ser 444:155-173.

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