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Aquaculture Environment Interactions

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AEI 15:101-114 (2023)  -  DOI:

Predicting eider predation potentials on mussels in Danish coastal areas—implications for mussel farming site-selection

Rune Skjold Tjørnløv1,2, Andreas Michael Holbach1, Karen Timmermann3,*

1Department of Ecoscience, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark
2DHI - Offshore Environment Dept, 2970 Hørsholm, Denmark
3Section for Coastal Ecology, DTU Aqua, DTU, 2800 Kgs. Lyngby, Denmark
*Corresponding author:

ABSTRACT: Selecting optimal locations for mussel farming is vital for the optimization of production yield and for the minimization of environmental impact. Although predation by sea ducks may induce large stock losses and hence severe economic loss for mussel farmers, predation potential is rarely included in site-selection tools. In this paper we present a GIS-based spatial model predicting the potential of eider predation on blue mussel farms in Danish coastal waters. The model incorporates national survey data on eiders, as well as knowledge of eider behavior and habitat preferences, and was calibrated with predated/non-predated observations of eiders from 9 experimental mussel farms or test lines in Danish coastal waters. Except for 1 case study area, our model successfully confirmed a higher predation potential at test sites where predation had been observed. Our resulting predation potential map revealed potentials ranging from very low in inner parts of narrow estuaries to very high in more open coastal areas. Integration of the predation map into an existing site-selection tool showed that areas optimal for mussel growth were also associated with the highest modelled predation potential. Nonetheless, it was possible to identify areas having a very low potential of predation and only a 10% lower mussel production potential. These results underpin the potential for reducing production loss and increasing income by including predation potential in site-selection tools. In addition, the eider predation model can be used to identify and subsequently protect key foraging areas to support eider conservation.

KEY WORDS: Mussel aquaculture · Stock losses · Human-wildlife interaction · Production optimization · Conservation

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Cite this article as: Tjørnløv RS, Holbach AM, Timmermann K (2023) Predicting eider predation potentials on mussels in Danish coastal areas—implications for mussel farming site-selection. Aquacult Environ Interact 15:101-114.

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