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

M. Thomson, A. R. Lyndon

Research output: Contribution to journalArticle

6 Citations (Scopus)
18 Downloads (Pure)

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.

Original languageEnglish
Pages (from-to)593-606
Number of pages14
JournalJournal of Fish Biology
Volume92
Issue number3
Early online date7 Feb 2018
DOIs
Publication statusPublished - Mar 2018

Keywords

  • B-type growth
  • Cohort analysis
  • Orkney
  • Salmo trutta
  • Sea trout
  • Smolt age

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science

Fingerprint Dive into the research topics of 'Comparing anadromous brown trout Salmo trutta in small, neighbouring catchments across contrasting landscapes: What is the role of environment in determining life-history characteristics?'. Together they form a unique fingerprint.

Cite this