Comparing anadromous brown trout Salmo trutta in small, neighbouring catchments across contrasting landscapes: What is the role of environment in determining life‐history characteristics?

Comparing anadromous brown trout Salmo trutta in small, neighbouring catchments across... Study of anadromous brown trout Salmo trutta in Orkney, U.K., burns (small streams) with a common‐garden sea in Scapa Flow supports the key role of nutrient availability in fresh water, independent of day length, as a determinant of smolt age, with a systematic increase in mean smolt age from 1 to 3 years related inversely to productivity. Whole catchment (8 km2) population budgets indicated annual smolt production of around 650 individuals from approximately 100 spawners. Egg‐to‐smolt survival was 0·65%, while marine survival was estimated from mark–recapture to be between 3·5 and 10%. The question of B‐type growth (accelerated growth immediately prior to or during smolt migration) was also addressed, with a strong negative correlation between B‐type growth and size at end of winter suggesting that this represents a freshwater compensatory growth response. The data obtained indicate the potential importance of small catchments for supporting anadromous Salmo trutta populations and suggest that small runs of spawners (<100 individuals) are adequate to maintain stocks in such situations. Furthermore, they support the key role of freshwater productivity in determining life‐history characteristics over small spatial scales, with Orkney providing a useful natural laboratory for future research into metapopulation genetic structuring and environmental factors at a tractable scale. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Fish Biology Wiley

Comparing anadromous brown trout Salmo trutta in small, neighbouring catchments across contrasting landscapes: What is the role of environment in determining life‐history characteristics?

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Publisher
Wiley Subscription Services, Inc., A Wiley Company
Copyright
Journal of Fish Biology © 2018 The Fisheries Society of the British Isles
ISSN
0022-1112
eISSN
1095-8649
D.O.I.
10.1111/jfb.13543
Publisher site
See Article on Publisher Site

Abstract

Study of anadromous brown trout Salmo trutta in Orkney, U.K., burns (small streams) with a common‐garden sea in Scapa Flow supports the key role of nutrient availability in fresh water, independent of day length, as a determinant of smolt age, with a systematic increase in mean smolt age from 1 to 3 years related inversely to productivity. Whole catchment (8 km2) population budgets indicated annual smolt production of around 650 individuals from approximately 100 spawners. Egg‐to‐smolt survival was 0·65%, while marine survival was estimated from mark–recapture to be between 3·5 and 10%. The question of B‐type growth (accelerated growth immediately prior to or during smolt migration) was also addressed, with a strong negative correlation between B‐type growth and size at end of winter suggesting that this represents a freshwater compensatory growth response. The data obtained indicate the potential importance of small catchments for supporting anadromous Salmo trutta populations and suggest that small runs of spawners (<100 individuals) are adequate to maintain stocks in such situations. Furthermore, they support the key role of freshwater productivity in determining life‐history characteristics over small spatial scales, with Orkney providing a useful natural laboratory for future research into metapopulation genetic structuring and environmental factors at a tractable scale.

Journal

Journal of Fish BiologyWiley

Published: Jan 1, 2018

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