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journal article May 01, 2018

Roles of discharge and temperature in recruitment of a cold‐water fish, the European grayling Thymallus thymallus, near its southern range limit

Tea Bašić ORCID J. Robert Britton ORCID Richard J. Cove Anton T. Ibbotson Stephen D. Gregory ORCID
Ecology of Freshwater Fish Vol. 27 No. 4 pp. 940-951 · Wiley
View at Publisher Save 10.1111/eff.12405
Abstract
AbstractRecruitment of salmonids is a result of density‐dependent factors, specifically egg production in the previous year, and density‐independent environmental processes driven by discharge and temperature. With the plethora of knowledge on major drivers of Atlantic salmon Salmo salar and brown trout Salmo trutta recruitment, there is a requirement to explore less known species, such as European grayling Thymallus thymallus, whose postemergence time coincides with period of increasing temperature and low discharge. This study assessed drivers of grayling recruitment in a southern English chalk stream, a system vulnerable to discharge and temperature alterations under future climate change predictions. The analyses explored age 0+ grayling survival in relation to conspecific and heterospecific densities and discharge‐ and temperature‐derived factors. The final mixed‐effects model revealed a positive relationship between age 0+ grayling survival and incubation temperature anomaly and age 0+ trout abundance. Similarly, postincubation temperature anomaly had a positive effect on 0+ grayling survival, but only up to a threshold temperature of 13.5°C, beyond which it had a negative effect. In contrast, increasing number of days with low discharge postincubation negatively influenced age 0+ grayling survival, with no evidence of an effect of elevated discharges following spawning. Our results emphasise the importance of maintaining natural discharge regimes in salmonid rivers by tackling multiple stressors operating at the catchment scale, including land and water use to mitigate for predicted climate driven changes. In addition, further research on recruitment drivers in less stable, rain‐fed systems, is required.
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Cited By
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Can stocking with advanced European grayling fry strengthen its populations in the wild?

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Environmental conditions modify density‐dependent salmonid recruitment: Insights into the 2016 recruitment crash in Wales

Stephen D. Gregory, Victoria E. Bewes · 2020

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Metrics
18
Citations
68
References
Details
Published
May 01, 2018
Vol/Issue
27(4)
Pages
940-951
License
View
Authors
T
Tea Bašić

Salmon and Freshwater Team Centre for Environment, Fisheries and Aquaculture Science Pakefield Road Lowestoft UK; Salmon and Trout Research Centre Game & Wildlife Conservation Trust FBA River Laboratory Wareham UK; Faculty of Science and Technology Centre for Conservation Ecology and Environmental Sciences Bournemouth University Poole UK

J
J. Robert Britton

Faculty of Science and Technology Centre for Conservation Ecology and Environmental Sciences Bournemouth University Poole UK

R
Richard J. Cove

Natural Resources Wales/Cyfoeth Naturiol Cymru Buckley UK

A
Anton T. Ibbotson

Salmon and Trout Research Centre Game & Wildlife Conservation Trust FBA River Laboratory Wareham UK

S
Stephen D. Gregory

Salmon and Trout Research Centre Game & Wildlife Conservation Trust FBA River Laboratory Wareham UK

Cite This Article
Tea Bašić, J. Robert Britton, Richard J. Cove, et al. (2018). Roles of discharge and temperature in recruitment of a cold‐water fish, the European grayling Thymallus thymallus, near its southern range limit. Ecology of Freshwater Fish, 27(4), 940-951. https://doi.org/10.1111/eff.12405
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