Do fish go with the flow? The effects of periodic and episodic flow pulses on 0+ fish biomass in a constrained lowland river

Walton, S.E.; Nunn, A.D.; Probst, W.N.; Bolland, J.D.; Acreman, M.; Cowx, I.G.. 2017 Do fish go with the flow? The effects of periodic and episodic flow pulses on 0+ fish biomass in a constrained lowland river. Ecohydrology, 10 (1), e1777. 14, pp. https://doi.org/10.1002/eco.1777

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Official URL: http://dx.doi.org/10.1002/eco.1777

Abstract/Summary

The hydrological regime is a significant driver of fish population dynamics in rivers, but there is a dearth of information regarding the mechanisms behind its effects on temperate species, especially non-salmonids. This study investigated the effects of periodic and episodic flow pulses on 0+ fish biomass in a constrained lowland river. De-seasonalized cross-correlation analysis was used to examine time-lagged correlations in episodic signals, in isolation of seasonal periodicity, to identify the responses and response timings of 0+ fish production to abiotic variables, and whether apparent “pulse-depletions” in biomass occur instantaneously (e.g., due to fish displacement during high pulses) or after a time lag. As anticipated, 0+ fish biomass was highest during periods of low discharge and high temperatures in summer, but cross-correlation analysis revealed a negative impact of high pulses on 0+ fish biomass with a lag of 7 months. There was no evidence for an instantaneous pulse-depletion effect of discharge on 0+ fish biomass, suggesting that the indirect effects of high pulses, such as habitat or food-web modifications, are more influential.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1002/eco.1777
UKCEH and CEH Sections/Science Areas:	Acreman
ISSN:	1936-0584
Additional Keywords:	0+ fish biomass, cross-correlation, fish production, hydroecology, river discharge, time lag
NORA Subject Terms:	Ecology and Environment Zoology
Date made live:	05 Apr 2017 13:34 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/516801

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1002/eco.1777

UKCEH and CEH Sections/Science Areas:

Acreman

ISSN:

1936-0584

Additional Keywords:

0+ fish biomass, cross-correlation, fish production, hydroecology, river discharge, time lag

NORA Subject Terms:

Ecology and Environment
Zoology