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Type of rheoreaction in the early ontogenesis of roach Rutilus rutilus (L.) as a factor determining its biotopic distribution

Author:
Kostin, V. V., Stolbunov, I. A.
Source:
Inland water biology 2016 v.9 no.2 pp. 167-171
ISSN:
1995-0829
Subject:
Rutilus rutilus, habitats, juveniles, larvae, ontogeny, rivers, surface water
Abstract:
The specific features of rheoreaction in roach Rutilus rutilus (L.) larvae from open and protected shallows of the Rybinsk Reservoir have been studied. Data on length and weight of roach sampled at various habitats at B–E developmental stages are presented. It has been revealed that the type of roach larvae rheoreaction is a behavioral mechanism of their distribution over different types of habitats, not only in rivers but also in the waterbodies with slow water turnover rates—lakes and reservoirs. By the time of developmental stage E, this mechanism provides the sustainable spatial separation of juvenile fish, which in the future may lead to intrapopulation differentiation in roach.
Agid:
5234105