Ecogeographical variability of the summer bird assembllje Pacific part of Russia
Yu. S. Ravkin1,2, V. G. Babenko3, M. S. Stishov4, V. V. Pronkevich5, M. I. Lyalina1
1Institute of Systematics and Ecology of Animals of SB RAS, Novosibirsk, Russia
2Tomsk State University, Tomsk, Russia
3Moscow City University, Moscow, Russia
4A. N. Severtsov Institute of Ecology and Evolution of RAS, Moscow, Russia
5Institute of Water and Ecological Problems Far Eastern Branch of RAS, Khabarovsk, Russia
Keywords: bird, ornithocomplexes, cluster analysis, environmental factors, correlation
Abstract
Bird counts were carried out in 794 habitats over 59 years (in separate seasons) from 1960 to 2018. 71 bird watchers participated in the collection of material. Based on the results of bird counting, a hierarchical classification and structural similarity graph of ornithocomplexes in the Pacific part of Russia, including Wrangel Island, were compiled. The hierarchical classification contains 3 overtypes, 16 types and 17 subtypes of the bird assembllje. The similarity graph is built at the type level and is represented by seven series (trends), two of which relate to undeveloped land communities of mainly the North Pacific and Amuro-Sakhalin physiographic countries. One series consists of ornithocomplexes of residential and recreational territories, and four - of water-near-water communities (mainland and marine). The given characteristics of classification taxa contain information on the five most numerous bird species (leaders in abundance), their part in communities, assembllje density, as well as background species richness and prevailing abundance of avifauna types. The composition of taxa revealed 10 environmental factors and 32 natural and anthropogenic regimes that correlate with spatial heterogeneity of ornithocomplexes. The strength and generality of the variability of bird communities and their habitats was estimated.
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