An overview of recruitment patterns of roach Rutilus rutilus (L.) between 1969 and 2001 in the rivers of England and their influence on population abundance

This source preferred by Robert Britton

Authors: Britton, J.R., Axford, S.N., Cowx, I.G. and Frear, P.A.

http://psjc.icm.edu.pl/psjc/cgi-bin/getdoc.cgi?AAAA012434

Journal: Ecohydrology & Hydrobiology

Volume: 4

Pages: 91-102

ISSN: 1642-3593

Annual roach recruitment success was variable in the rivers of England between 1969 and 2001. Spatial and temporal patterns revealed common phases of weak and strong recruitment. Strong recruitment periods were 1975/77, 1983/85, 1989/90 and 1995/96. The recruitment mechanism appeared to be climate driven, with temperature and discharge the major variables in determining the recruitment strength of a cohort. The key phase appeared to be during the first year of life of the cohort and in particular during critical periods in their growth year when susceptibility to displacement by increased discharge was determined by their actual body length.

The recruitment pattern produced a similar numerical population abundance trend, with increased abundance following the successful recruitment of a strong year class. This was in contrast to biomass, which was relatively stable.

This data was imported from Scopus:

Authors: Britton, J.R., Cowx, I.G., Axford, S.N. and Frear, P.A.

Journal: Ecohydrology and Hydrobiology

Volume: 4

Issue: 2

Pages: 91-102

ISSN: 1642-3593

Annual roach recruitment success was variable in the rivers of England between 1969 and 2001. Spatial and temporal patterns revealed common phases of weak and strong recruitment. Strong recruitment periods were 1975/77, 1983/85, 1989/90 and 1995/96. The recruitment mechanism appeared to be climate driven, with temperature and discharge the major variables in determining the recruitment strength of a cohort. The key phase appeared to be during the first year of life of the cohort and, in particular, during critical periods in their growth year when susceptibility to displacement by increased discharge was determined by their actual body length. The recruitment pattern produced a similar numerical population abundance trend, with increased abundance following the successful recruitment of a strong year class. This was in contrast to biomass, which was relatively stable.

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