Morphological and biological characteristic as an indicator of population of the Siberian roach (Rutilus rutilus lacustris) from the Chulym river in the conditions of food competition with invasive species

Abstract

Biological invasions are the second most significant threat to biodiversity and native ecosystems, after direct destruction of habitats. Due to the mutual action of natural (climate change) and anthropogenic (the introduction of an alien species) factors, bleak was dispersed from the Novosibirsk reservoir to the nearest reservoirs. After sometime of the settlement of Bleak (Alburnus alburnus) along lower reaches of the Chulym river quality of the Siberian Roach (Rutilus rutilus lacustris) population in the zone of thermal pollution began to deteriorate. The analysis of the obtained data showed that the populations of roach living in the zone where the phenomenon of food competition is present and without it have significant differences in a number of morphological and biochemical indicators. Il could be due to the presence of a competitive invasive species bleak, which lives below dam of the Nazarovskaya SDPS. Thus, in the diet of a population where bleak is absent, manyinsects remains were found, while in the diet of the roach population, plant remains predominate, due to its competition with bleak for animal feed.