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

This source preferred by Robert Britton

Authors: Bašić, T., Britton, J.R., Cove, R.J., Ibbotson, A.T. and Gregory, S.D.

http://eprints.bournemouth.ac.uk/30699/

Journal: Ecology of Freshwater Fish

eISSN: 1600-0633

ISSN: 0906-6691

DOI: 10.1111/eff.12405

© 2018 John Wiley & Sons A/S. 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.

This data was imported from Scopus:

Authors: Bašić, T., Britton, J.R., Cove, R.J., Ibbotson, A.T. and Gregory, S.D.

http://eprints.bournemouth.ac.uk/30699/

Journal: Ecology of Freshwater Fish

Volume: 27

Issue: 4

Pages: 940-951

eISSN: 1600-0633

ISSN: 0906-6691

DOI: 10.1111/eff.12405

© 2018 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd 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.

This data was imported from Web of Science (Lite):

Authors: Basic, T., Britton, J.R., Cove, R.J., Ibbotson, A.T. and Gregory, S.D.

http://eprints.bournemouth.ac.uk/30699/

Journal: ECOLOGY OF FRESHWATER FISH

Volume: 27

Issue: 4

Pages: 940-951

eISSN: 1600-0633

ISSN: 0906-6691

DOI: 10.1111/eff.12405

The data on this page was last updated at 05:18 on July 20, 2019.