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Scheme of the running Bdistance-based^ Redundancy Analyses explaining the presence of three species of the family Athericidae in relation to factors acting on three hierarchical levels
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From the family Athericidae, only three species (Atherix ibis, Ibisia marginata, Atrichops crassipes) are widespread in Central and Western Europe. Although predatory larvae of these species are an important component of many benthic communities, little is known about their distribution and ecological preferences. Aiming to fill these gaps, the dis...
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Context 1
... for explanation of the variation in the species data, we performed three different db_RDAs with the forward selection method of significant factors involved at each of the three hierarchical levels of acting of environmental conditions ( Fig. 2): run 1) db_RDA of species data constrained by physico-chemical variables, run 2) db_RDA of species data constrained by physico-chemical variables + site characteristics, run 3) db_RDA of species data constrained by physico-chemical variables + site characteristics + catchment characteristics. The response curves, which explained the ...
Context 2
... the studied ecoregions, Atherix ibis was present at the most of sampling sites situated in the Central highlands (576 sites) and Hungarian lowlands (19 sites) (Fig. 2). In the Carpathians ecoregion, the number of occurrences in A. ibis (57 sites) was similar to Ibisia marginata, which occurred there at 62 sites (Fig. 3). In the Central highlands, I. marginata occurred in one third of the sampling sites (216 sites), while its presence was only occasional in the Hungarian lowland ecoregion. Atrichops ...
Context 3
... selection of environmental variables based on the analysis of generalized linear model with step-by-step merging procedure of non-significant effects Table 2 Results of Bdistance-based^ Redundancy analyses with the forward selection of the significant environmental variables reflecting the hierarchical levels of the environmental factors (see Fig. 2 Preference categories were defined according to the Bfreshwaterecology.info^ database agricultural land were the determinants adding significant more explained variability to the model created at the first two hierarchical levels. Organic, inorganic and toxic pollution of the streams, as well as the total degradation of stream are ...
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