Affordable Access

deepdyve-link
Publisher Website

Density-dependence and environmental variability have stage-specific influences on European grayling growth.

Authors
  • Marsh, Jessica E1, 2, 3
  • Cove, Richard J4
  • Britton, J Robert5
  • Wellard, Robert G6
  • Bašić, Tea7
  • Gregory, Stephen D8, 9
  • 1 Salmon and Trout Research Centre, Game and Wildlife Conservation Trust, The River Laboratory, Wareham, Dorset, UK. [email protected]
  • 2 Department of Life and Environmental Sciences, Faculty of Science and Technology, Bournemouth University, Poole, Dorset, UK. [email protected]
  • 3 Centre for Environment, Fisheries and Aquaculture Science (Cefas), Weymouth, Dorset, UK. [email protected]
  • 4 Natural Resources Wales/Cyfoeth Naturiol Cymru, Buckley, Flintshire, UK.
  • 5 Department of Life and Environmental Sciences, Faculty of Science and Technology, Bournemouth University, Poole, Dorset, UK.
  • 6 The Piscatorial Society, Wiltshire, UK.
  • 7 Salmon and Freshwater Team, Centre for Environment, Fisheries and Aquaculture Science (Cefas), Lowestoft, Suffolk, UK.
  • 8 Salmon and Trout Research Centre, Game and Wildlife Conservation Trust, The River Laboratory, Wareham, Dorset, UK.
  • 9 Centre for Environment, Fisheries and Aquaculture Science (Cefas), Weymouth, Dorset, UK.
Type
Published Article
Journal
Oecologia
Publisher
Springer-Verlag
Publication Date
May 01, 2022
Volume
199
Issue
1
Pages
103–117
Identifiers
DOI: 10.1007/s00442-022-05163-2
PMID: 35507086
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Fish somatic growth is indeterminate and can be influenced by a range of abiotic and biotic variables. With climate change forecast to increase the frequency of warming and unusual discharge events, it is thus important to understand how these variables currently influence somatic growth and how that might differ for specific age-classes and/ or life stages. Here, we used a 17-year dataset from a chalk stream in southern England to identify the abiotic and biotic influences on the growth of juvenile, sub-adult and adult life stages of European grayling (Thymallus thymallus), a cold-water riverine salmonid. The results revealed that interannual variations in grayling growth were well described by annual- and site-specific abiotic and biotic explanatory variables. We found divergent responses between life stages to increased temperature and unusual discharge during the main growth period with, for example, elevated temperatures related to increased juvenile growth but reduced sub-adult growth, and high discharge events related to increased sub-adult growth yet reduced juvenile growth. Conversely, stage-specific grayling abundance negatively influenced growth at each life stage, though only juvenile growth was impacted by the abundance of a competitor species, brown trout (Salmo trutta). These results emphasise the merits of testing a wide range of environmental and biological explanatory variables on fish growth, and across life stages. They also reveal the importance of maintaining high habitat heterogeneity in rivers to ensure all life stages can reduce their competitive interactions and have access to adequate flow and thermal refugia during periods of elevated environmental stress. © 2022. Crown.

Report this publication

Statistics

Seen <100 times