Realistic aquatic and terrestrial ecosystems are constantly adapting to various disturbances of

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Realistic aquatic and terrestrial ecosystems are constantly adapting to various disturbances of anthropogenic and natural origin. According to the “Alternative stable state theory” ecosystem has various states and can switch from one state to another when ecosystem conditions are changing (Holling, 1973; Scheffer, 2001). When the magnitude of such disturbance is negligible, the shift in the ecosystem structure and functioning does not occur. In this case the ecosystem resilience allows it to return to its original state (REF). Population densities are changing rapidly in response to a small disturbance. Such quantitative change does not necessarily lead to ecosystem structural and functional shift. On the other way around, when…show more content…
In practice the parameters describing ecosystem functioning can be determined based on the species trait composition (including life history, physiological, morphological and ecological traits). In comparison with conventional taxonomic diversity (that provides information on ecosystem structure), traits can be directly linked to the functional roles of species in the ecosystem and their responses to human-induced or natural disturbance. However assessment aquatic invertebrates species trait composition in relation to pesticide pollution (which is the focus of the current study) is not clearly documented. Effects of pesticides on functional characteristics of invertebrate communities require further understanding. So far only study of Liess et al (2005) introduced an index based on species traits in order to evaluate responses of aquatic invertebrates to pesticide effects. The aim of the current paper is to study whether pesticide pollution produces shift in the ecosystem structure (taxonomic diversity) and functioning (evaluated based on the species trait approach). Further on we aim to compare functional (species trait) and structural (taxonomic diversity) components of ecosystem in their response to pesticide pollution. We hypothesize that pesticide effects result in pronounced
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