Saline rivers are supposed to be ‘hot spots’ of high biological productivity in arid landscapes. To test this, we quantified the production of chironomid larvae, because river production is known to be transferred to arid landscapes primarily by birds fed on these larvae. In addition, we studied the potential biochemical quality of the larvae for birds… (More)
The review of the salinity tolerance of various macrozoobenthos taxa is based on the published data and the results of our studies. Significant differences in the tolerance of hydrobionts to water salinity in rivers of different arid regions are shown. Leeches, bivalved mollusks, larvae of stoneflies, caddis flies, and mayflies are the most stenohaline… (More)
Fatty acid (FA) contents and compositions in the pectoral muscles of 18 bird species from Novosibirsk, Volgograd, and Yaroslavl oblasts were studied. Three groups of birds that had significantly different FA compositions were distinguished based on a multivariate statistical analysis: Passeriformes, Columbiformes, and a group of waterfowl and waterbird… (More)
Cytology and ecology of Chironomus (Chironomus) salinarius Kieffer, 1915 (Diptera, Chironomidae) was examined from material collected in the saline rivers of the Lake Elton basin (Volgograd region, Russia). Larvae of salinarius-type were identified as C. salinarius on the basis of their karyotype. The species is redescribed on the basis of all metamorphic… (More)
Stability is a major quality of systems. We discuss the mathematical formalization and hydrobiological examples of various definitions of stability: Lyapunov, Lagrange (steadiness), Poisson (periodic stability), Svirezhev (hierarchical), Holling (resilience), Fleishman (vitality), and Gnedenko (reliability) stabilities.
The use of different methods of multivariate ordination for the analysis of the distribution pattern of benthic habitats along the gradient of a river ecosystem is considered. Problems of determination of homogenous segments of a stream are discussed using macrozoobenthos communities of small rivers of the lower Volga Basin as examples. A method for… (More)
A system of indices that estimate different statistical patterns of communities’ taxonomic structure organization such as nestedness, turnover, and coherence in species cooccurrence is considered. On the basis of data of hydrobiological monitoring, the statistical significance of the structural determinancy of ecosystems is analyzed by means of… (More)
Species turnover or coherence in species co-occurrence as well as boundary clumping and nestedness in structural composition of ecological communities reflect the extent of determinancy in their organization (Leibold, Mikkelson, 2002). These phenomena may be a consequence of either interactions between species or heterogeneity in spatial distribution of… (More)