Архив метки: soil nematodes

STRUCTURE OF THE SOIL NEMATODES COMMUNITY OF THE DRY STEPPE PHYTOCENOSES ON THE VODNY ISLE IN THE ROSTOVSKY NATURE RESERVE IN SPRING

Arid Ecosystems

UDC 631.467.2

Shmatko V.Yu., Ilyina L.P., Sokolova T.A. STRUCTURE OF THE SOIL NEMATODES COMMUNITY OF THE DRY STEPPE PHYTOCENOSES ON THE VODNY ISLE IN THE ROSTOVSKY NATURE RESERVE IN SPRING // Arid Ecosystems. 2023. Vol. 29. № 3 (96). P. 100-110. | PDF

We present the results of the study of the community structure of the soil nematodes in the key areas on the Vodny Isle of the Rostovsky Nature Reserve in the spring period. A total of 76 genera from 41 families and 9 orders were identified, and 39 genera were common for two months (April-May). It is shown that a number of features of the fauna of soil nematodes in spring are manifested in the generic diversity, occurrence and dominance of individual ecological-trophic groups and genera.

The total number of species at key sites varies from 17 to 33. At the same time, the number of nematodes in April ranged from 230 to 994 ind. per 100 cm3 of soil, and from 134 to 1043 ind. per 100 cm3 in May. It was revealed that the most diverse generic composition was in Dorylaimida, which included 29 genera, in Tylenchida with 19 genera, and in Rhabditida with 11 genera.

It was discovered that in spring, when the indicator of the crude aboveground plant phytomass increases, the number of nematodes from the group that feeds on plants increases as well, which was confirmed by the correlation analysis (the correlation coefficient has very high values: rapril = 0.86, rmay = 0.96 at a p-level < 0.05).

Keywords: soil nematodes, phytocenoses of the dry steppe, geobotanical indicators, ecological trophic groups, correlation analysis.

Financing. The work was prepared for the State Research Center of the Russian Academy of Sciences, project No. 122020100332-8 “The Role of Natural and Anthropogenic Factors in the Formation and Dynamics of Lowland Biogeocenoses”.

DOI: 10.24412/1993-3916-2023-3-100-110

EDN: KHSIDW

SEASONAL DYNAMICS OF THE STRUCTURE OF THE COMMUNITIES OF SOIL NEMATODES IN CHESTNUT SOILS OF THE MANYCH VALLEY UNDER PASTURE LOAD

Arid Ecosystems

Shmatko V.Yu.,  Sushko K.S.,  Sokolova T.A., Ilyina L.P. SEASONAL DYNAMICS OF THE STRUCTURE OF THE COMMUNITIES OF SOIL NEMATODES IN CHESTNUT SOILS OF THE MANYCH VALLEY UNDER PASTURE LOAD // Arid ecosystems. 2021. V. 27. № 1 (86). P. 106-118. | PDF

In this article, two key areas with virgin and pasture biotopes were studied, for which soil parameters were determined, a brief description of the vegetation was given, and the spectral reflectance properties of the vegetation cover (NDVI) were calculated using Landsat 8 OLI images.

The seasonal dynamics of the structure of soil nematode communities in chestnut solonetzic soils under pasture load has been studied. A number of features have been identified that are manifested in the species diversity of the fauna, changes in the total number, domination of certain trophic groups and genera.

For the studied areas, 133 taxa were identified, exact species identification is given for 58 species. It has been established that the features of soil nematode communities in different seasons of the year are manifested in the dominance of certain trophic groups and genera, as well as their total number at key sites.

In general, the fauna of nematodes can be assessed as quite diverse – Shannon’s index (Hˊ) throughout the year at all sites varied within the same values. The nematode community maturity index by Bongers (MI) indicates the stability of their habitat conditions.

Keywords: soil nematodes, chestnut solonetzic soils, pasture load, vegetation, ecological and trophic composition, diversity index, community maturity index.

DOI: 10.24411/1993-3916-2021-10142