Ephemeroptera and Plecoptera: model groups to determine environmental long-term changes of aquatic biotopes
Tomáš Soldán (firstname.lastname@example.org)
Světlana Zahrádková, Jan Helešic, Jindřiška Bojková
Grant Agency of the Czech Republic, project no. 206/06/1133
Contrary to most countries, the Ephemeroptera and Plecoptera have been extensively studied for the past 50 years at more than 2,000 localities in the Czech Republic. Thanks to data obtained in the 1950's and 1960's, 1975-1985, and 1990-1995 we are able to evaluate, on the basis of changes in frequency and dominance of individual species, really long-term changes in their taxocenes in relation to principal environmental factors. Besides precision of the taxocene composition and ecological characteristics and measurement suggested to protect species in question, the main objective of the present project are, as follows:
- to sample the localities investigated in the past (especially 150 ones sampled in all seasons and periods) as well as principal abiotic data;
- to construct distributional maps showing both historical and present distribution of species and respective long-term changes and
- to discuss trends in long-term changes from the local, regional and global point of view.
Three hypotheses were erected:
- local adverse affects show both positive and negative tendencies while
- positive tendencies are manifested in some regional changes, and
- global changes are reflected in habitat and/or lower stream order preferences tending even to chorological changes.
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