Michael G. Sergeev

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The objective of this study was to apply knowledge of holarctic grasshopper biogeography in representative, temperate ecosystems (Russia, South Siberia, Sayans region; 685,000 km2 and USA, Wyoming; 272,000 km2) to develop a comparative basis for understanding and conserving insect biodiversity. Maps of species distributions and vegetation zones were(More)
This paper discusses orthopteran conservation in temperate and subtropical Eurasia. Distribution patterns of the orthopteran centres of diversity and endemism are described. Eleven main areas of diversity and endemism are identified. The majority of rare taxa are associated with these areas. The distribution of protected areas is discussed in relation to(More)
Seasonal dynamics and changes in the general condition of the Italian locust population in the southeast of the West Siberian Plain that were observed throughout the 20th century are characterized in this paper. It was demonstrated that during the last outbreaks of mass reproduction of this species, dominant were individuals transitional from typical(More)
Results of classification of terrestrial ecosystems using an average similarity matrix are reported for the West Siberian Plain. Initial indices are first calculated separately for four components of an ecosystem. These components (blocks) include the underground block (soil humus, mortmass, and underground phytomass), above-ground vegetation, and(More)
The spatial distribution of the terrestrial invertebrate population of the West Siberian Plain is analyzed at the level of large functional groups (soil nematodes, annelids, microarthropods, mesoarthropods, snails, grass layer arthropods). Their air-dry biomass and roles in local ecosystems are estimated. The invertebrate population was classified in two(More)
The main stages and ways of development of insect biogeography in Russia are discussed. Three general research programs (studies of ranges, zones, and regions) are described. The role of the regional approach in biogeography is characterized. Some problems related to studies of insect ranges are evaluated, and the need for creating practical range maps is(More)
The dynamics of a local population of the Italian locust is characterized for an area near the northeastern boundary of its range. In this area, the situation during the Italian locust outbreak is quite different from patterns in dry steppes and semideserts (which are optimal territories for the species): hopper bands occupy small plots and migrate in short(More)
The sequences of two mitochondrial 16S RNA gene fragments (137- and 174-bp in size) were determined in nine grasshopper species belonging to three Acrididae subfamilies. Phylogenetic reconstruction was performed using the sequences of twelve grasshopper species and the cricket Acheta domesticus sequence as an outgroup (some data were purchased from the(More)
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