Oedaleus decorus is a widely distributed acridid over the Eurasian semi-arid territories, from the Atlantic coast to the Pacific coast. In many semi-arid territories, O. decorus was and is the most important pest, but in the south-eastern part of West Siberian Plain, it was not considered a pest until the 1960s. We compared two sets of data on the acridid distribution in the region: before 1960 and from 1961 until 2021. Until the 1960s, the species occurred mainly in the southern steppes. Since the 1960s, its distribution changed significantly. Nowadays, it occupies almost all local steppes and the southern part of the forest-steppes and can be also found on the eastern side of the Ob River. These shifts may be explained by both climatic changes and changes in human activities. During upsurges the densities of O. decorus were often more than one to two adults per square meter. It is often abundant in the same habitats and in the same periods as the Italian locust (Calliptamus italicus)—one of the most important acridid pests. This means during joint outbreaks these two species can simultaneously damage almost all spectrum of plants.

Grasshoppers (Acridoidea) are one of the most essential components of grassland ecosystems. They are mainly primary consumers and some of them, e.g., the Italian locust, may be very important pests. The main goal of this article is to discuss possible shifts in the species distribution relative to global and local changes. General patterns of latitudinal, longitudinal, and altitudinal distribution of its populations are revealed for the eastern part of its range (mainly from 70° E eastward). Data on its historic and modern localities with geographic coordinates were collected and analyzed. The Maxent approach was used to model species distribution. The comparative analysis shows there are no significant changes in its range. The analysis of altitudinal distribution over mountains of the region demonstrates no significant changes as well. The expected distribution of Calliptamus italicus based on the location points displays significant changes in areas suitable for the species and their evident associations with outbreak occurrences. The models created for 2021–2040 and 2041–2060 unveil that, in the future, the local parts of the Italian locust range may shift northward and north-eastward, but the main areas with suitable conditions for this species will remain almost the same.

Two abundant acridid species (Chorthippus apricarius and Locusta migratoria) are widely distributed over South Siberia. Estimations of suitability conditions on the basis of the MaxEnt algorithm well correspond to the known localities of each species for the contemporary period. The main bioclimatic variables explaining these species distribution are associated with temperatures, especially those of the cold season. Predicted distribution patterns for 2021–2040 and 2041–2060 and for the scenarios of the high levels of the greenhouse gas emission show serious significant differences between the two model species. These forecasts demonstrate the explicit worsening of conditions for Chorthippus apricarius in South Siberia, and the significant expansion of territories applicable for Locusta migratoria in the southern parts of West Siberia and in Northern Kazakhstan. This trend looks like enhancing in the second half of the 21st century. The optimal areas for the migratory locust may cover the huge territories between 50° and 62° N and between the Ural Mts. and the north-western parts of the Altai-Sayan Mts. where a new area of possible outbreaks of L. migratoria may emerge. In the adjacent regions, the areas with suitable conditions for this species can expand significantly as well, including Primorskii Territory. Hence, the general continuation of global warming will most likely lead to some significant shifts in the distribution of some possible acridid pests across South Siberia.

Aim. Angaracris barabensis is widely distributed across the Asian grasslands. It is often qualified as one of the important pests. The aim of the paper is to estimate possible shifts of its distribution relative to global warming. The geographic coordinates of 384 localities were determined for the species. Two different approaches to species distribution modelling (maximum entropy and multidimensional ellipsoid envelope) were used. The general patterns of distribution were described. Several models of the species distribution were generated and compared. The main factors of its distribution are revealed. Ecological modelling predicts opportunity of possible northward shifts of the species range in Central and East Siberia and persistence of areas of possible harmfulness in South Siberia, Mongolia and North China. Our predictions show two opposite trends. In the western and southeastern parts of the species range, suitability of conditions will decrease. In the central and north‐eastern parts, the suitability will remain almost the same or even increase. The comparative analysis shows there are no evident contemporary shifts of range boundaries of A. barabensis associated with global warming per se or this tendency is extremely weak. However, the distribution of suitable conditions can change significantly during the next several decades.

The goal of this article is to estimate the opportunities for range shifts of the widely distributed grasshopper Celes skalozubovi now and in the future (until 2060) in view of the possible changes of their population statuses. The general distribution of C. skalozubovi over Eurasia is assessed by its occurrence points. High levels of species abundance are revealed for the steppe landscapes of the Altai-Sayan Mts. The uneven, sometimes insular, character of its distribution is described for West Siberia, North Kazakhstan, and the Russian Far East. Ecological and geographic modelling based on the MaxEnt algorithm allows to reveal two opposite trends in the possible distribution of the species in the future, especially in the middle of the 21st century. In particular, the habitat conditions may significantly worsen for a major part of the species range relative to the modern situation. However, they may improve in East Siberia and the region near the Sea of Okhotsk. Задача публикации — оценить возможности расселения широко распространенной кобылки Скалозубова сейчас и в будущем (до 2060 г.) в связи с возможным изменением статусов ее популяций. По точкам нахождения охарактеризовано общее распространение Celes skalozubovi в Евразии. Выявлены высокие уровни численности вида в степных ландшафтах Алтае-Саянской горной системы и локальный характер его распределения в западносибирско-казахстанской и дальневосточной частях ареала. Эколого-географическое моделирование распространения вида на основе алгоритма максимальной энтропии позволяет выявить разнонаправленные тренды изменений его вероятного распределения в будущем, особенно в середине XXI в., а именно значительное ухудшение условий обитания вида в значительной части ареала и улучшение таковых в Восточной Сибири и в Приохотье.

The handsome cross grasshopper Oedaleusdecorus (Germar), which was a minor pest in the 19th and first half of the 20th century, in the late 20th and early 21st centuries, became one of the emerging regional pests in the Asian part of its range, especially across the intermountain basins of the mountains of South Siberia, Mongolia and North and Northeast China. This is why it is necessary to identify the main trends of possible changes in its distribution. Several sets of data on the species distribution (1895–1960, 1961–2023, and all data) are analysed and several various approaches to modelling (graphic, maximum entropy and multidimensional ellipsoid) are utilised. The models produced for modern conditions describe well the known geographical and ecological distributions of the species in the Asian part of its range. Graphic models characterising the species’ distribution within a system of life zones and major ecosystem types show its general preference for dry steppes and semideserts. The models demonstrate apparent opportunities for this species to pierce northwards (at least up to 58° N in West Siberia, 62–63° N in East Siberia) in the future. This means that in the future, there is a certain probability that some individuals will migrate to these more northern regions. In the context of global warming, further northwards and northeastward shifts in the range boundaries of O. decorus can be predicted. In addition, there have been some changes in its population distribution and abundance, especially in the optimal parts of its population system where O. decorus normally colonises all applicable habitats; its average abundance is relatively high and it is common even during depressions. These shifts may be justified by both climatic changes (especially northwards) and some transformations of human activities (mainly for eastwards relocation).