Soil Nematode Communities under Crowns of Trees Introduced in Polar-Alpine Botanical Garden
D. S. KALINKINA1, A. A. SUSHCHUK1, E. M. MATVEEVA1, I. V. ZENKOVA2
1Institute of Biology of the Karelian Research Centre of RAS, 185910, Petrozavodsk, Pushkinskaya str., 11
2Institute of North Industrial Ecology Problems of the Kola Science Centre of RAS, 184209, Apatity, Akademgorodok, 14A
Keywords: почвенные нематоды, древесные интродуценты, ботанический сад, структура сообществ, нематоды-паразиты растений, Мурманская обл, soil nematodes, introduced trees, botanical garden, community structure, plant-parasitic nematodes, Murmansk region
Abstract
Nematode communities were studied in the root-inhabited soil layer under trees introduced in the Polar-Alpine Botanical Garden of Kоla Scientific Centre, RAS in Murmansk region. Nematodes of 48 taxa were found under introduction; bacterial feeders and plant parasites showed the greatest diversity (56 and 21 % of the total number of taxa, respectively). Tendency of genera number decreasing was shown in series “deciduous tree - coniferous tree - natural biocoenosis”; and similar regularity was obtained for plant-parasites. There were found phytoparasitic taxa rare for North-West of Russia. An adaptive mechanism related to delay in egg laying by female and further intra-uterine development of juveniles was found in the populations of Rhabditis producta Schneider, 1866 (bacterial feeding nematodes). This mechanism is very important for offspring survival in unfavorable environmental conditions in the North. The study allows to establish reliable correlation between taxonomic diversity of nematodes and majority of investigated soil properties (pH, ash content, N, P): relative abundance of omnivorous and associated with plants nematodes correlates with content of organic matter, organic carbon, C : N ratio; and relative abundance of plant-parasitic nematodes shows a correlation with vegetation cover.
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