Potential of a no-take marine reserve to protect home ranges of anadromous brown trout (Salmo trutta)

Thorbjørnsen, Susanna Huneide, Moland, Even, Simpfendorfer, Colin, Heupel, Michelle, Knutsen, Halvor, and Olsen, Esben Moland (2019) Potential of a no-take marine reserve to protect home ranges of anadromous brown trout (Salmo trutta). Ecology and Evolution, 9 (1). pp. 417-426.

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Abstract

The extent to which no-take marine reserves can benefit anadromous species requires examination. Here, we used acoustic telemetry to investigate the spatial behavior of anadromous brown trout (sea trout, Salmo trutta) in relation to a small marine reserve (similar to 1.5 km(2)) located inside a fjord on the Norwegian Skagerrak coast. On average, sea trout spent 42.3 % (+/- 5.0% SE) of their time in the fjord within the reserve, a proportion similar to the area of the reserve relative to that of the fjord. On average, sea trout tagged inside the reserve received the most protection, although the level of protection decreased marginally with increasing home range size. Furthermore, individuals tagged outside the reserve received more protection with increasing home range size, potentially opposing selection toward smaller home range sizes inflicted on fish residing within reserves, or through selective fishing methods like angling. Monthly sea trout home ranges in the marine environment were on average smaller than the reserve, with a mean of 0.430 (+/- 0.0265 SE) km(2). Hence, the reserve is large enough to protect the full home range of some individuals residing in the reserve. Synthesis and applications: In general, the reserve protects sea trout to a varying degree depending on their individual behavior. These findings highlight evolutionary implications of spatial protection and can guide managers in the design of marine reserves and networks that preserve variation in target species' home range size and movement behavior.

Item ID: 57156
Item Type: Article (Research - C1)
ISSN: 2045-7758
Keywords: acoustic telemetry, behavior, marine reserve design, movement, sea trout, selection, space use
Copyright Information: Copyright © 2018 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.
Funders: Research Council of Norway (RCN), FP7 ERA‐Net BiodivERsA, Environmental officer at the County Governor, Aust‐Agder
Projects and Grants: RCN grant No 201917 PROMAR, FP7 ERA‐Net BiodivERsA - grant No 225592 BUFFER
Date Deposited: 20 Feb 2019 07:32
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 40%
05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050209 Natural Resource Management @ 30%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070402 Aquatic Ecosystem Studies and Stock Assessment @ 30%
SEO Codes: 96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960507 Ecosystem Assessment and Management of Marine Environments @ 80%
83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8302 Fisheries - Wild Caught > 830201 Fisheries Recreational @ 20%
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