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

Basic, T., Britton, J.R., Cove, R.J., Ibbotson, A.T. and Gregory, S.D., 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. (In Press)

Full text available as:

[img] PDF (This is the peer reviewed version of an article published in final form at https://onlinelibrary.wiley.com/doi/full/10.1111/eff.12405)
Grayling recruitment_accepted.pdf - Accepted Version
Restricted to Repository staff only until 1 May 2019.
Available under License Creative Commons Attribution Non-commercial No Derivatives.

666kB

DOI: 10.1111/eff.12405

Abstract

Recruitment 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.

Item Type:Article
ISSN:0906-6691
Additional Information:This is the peer reviewed version of the following article: Basic, T., Britton, J.R., Cove, R.J., Ibbotson, A.T. and Gregory, S.D., 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 (In Press), which has been published in final form at https://onlinelibrary.wiley.com/doi/full/10.1111/eff.12405. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Uncontrolled Keywords:Recruitment; discharge; temperature; salmonids; climate change; chalk streams
Group:Faculty of Science & Technology
ID Code:30699
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:11 May 2018 11:12
Last Modified:11 May 2018 11:12

Downloads

Downloads per month over past year

More statistics for this item...
Repository Staff Only -