Steppe Habitats Research Articles

Imperiled wanderlust lichens in steppe habitats of western North America comprise geographically structured mycobiont lineages and a reversal to sexual reproduction within this asexual clade

The northern North American Cordillera is a globally significant center of endemism. In western North America, imperiled arid steppe habitats support a number of unique species, including several endemic lichens. However, processes driving diversification and endemism in this region remain unclear. In this study, we investigate diversity and phylogeography of the threatened wanderlust lichens (mycobiont = Rhizoplaca species) which occur unattached on calcareous soils in steppe habitats in western North America. Wanderlust lichens comprise three species of lichen-forming fungi (LFF) – Rhizoplaca arbuscula, R. haydenii, and R. idahoensis (endangered, IUCN Red List) – which occur in fragmented populations in Idaho and Wyoming, with more limited populations in southeastern Montana and northern Utah. These lichens reproduce almost exclusively via large, asexual vegetative propagules. Here, our aims were to (i) assess the evolutionary origin of this group and identify phylogeographic structure, (ii) infer ancestral geographic distributions for lineages within this clade, and (iii) use species distribution modeling to better understand the distribution of contemporary populations. Using a genome-skimming approach, we generated a 19.1 Mb alignment, spanning ca. half of the complete LFF genome, from specimens collected throughout the entire range of wanderlust lichens. Based on this phylogeny we investigated phylogeographic patterns using RASP. Finally, we used MaxEnt to estimate species distribution models for R. arbuscula and R. haydenii. We inferred a highly structured topology, with clades corresponding to distinct geographic regions and morphologies represented throughout the group’s distribution. We found that R. robusta, a sexually reproducing taxon, is clearly nested within this asexual lineage. Phylogeographic analyses suggest that both dispersal and vicariance played a significant role throughout the evolutionary history of the vagrant Rhizoplaca clade, with most of the dispersal events originating from the Salmon Basin in eastern Idaho – the center of diversity for this group. Despite the fact that wanderlust lichens are dispersal limited due to large, unspecialized vegetative propagules, we inferred multiple dispersal events crossing the Continental Divide. Comparing herbarium records with SDMs suggests that wanderlust lichens don’t fully occupy the areas of highest distribution probability. In fact, documented records often occur in areas predicted to be only marginally suitable. These data suggest a potential mismatch between contemporary habitats outside of the center of diversity in eastern Idaho with the most suitable habitat, adding to the vulnerability of this imperiled complex of endemic lichens.

Modeling the Distribution and Environmental Preferences of the Ladakh Urial in the Arid Himalayas.

Mountains play a crucial role in shaping the climate of an area and subsequently, the environments and species that are suited to those particular conditions. Understanding the relationships between environmental conditions and their influence on the occurrence of a species is necessary to make informed decisions when conserving relevant habitats. This study evaluated and compared the potential for different interactions between climatic variables to describe the environmental preferences and the range of the Ladakh urial, a narrowly distributed sub-species of Ovis vignei, in the arid Himalayas. Species distribution models were created from spatially thinned presence-only occurrence data of 50 locations using a Maximum Entropy (Maxent) model. For this, we subdivided the modeled distribution into environmental categories with varying degrees of suitability. We identified a high cold precipitation to annual precipitation ratio typical of cold desert climates well suited to describe the highest quality environments for urial. The inverse, low warm precipitation to annual precipitation ratio was found to better describe the urial's range at the lower end of potential habitat. In this comparison, we observed that with the exclusion of unsuitable cold steppe habitat with a higher warm precipitation to annual precipitation ratio, we were able to refine the extent of this species range but at a trade-off to the accurate description of high-quality environments. This study demonstrated the strong potential of cold arid climatic conditions to describe the distribution of urial in India, which have implications for identifying important areas for the conservation and management of the species in the high altitude rangelands of Ladakh.

Was the steppe bison a grazing beast in Pleistocene landscapes?

The history and palaeoecology of the steppe bison (Bison priscus) remain incompletely understood despite its widespread distribution. Using dental microwear textural analysis (DMTA) and vegetation modelling, we reconstructed the diet and assessed the habitat of steppe bison inhabiting Eurasia and Alaska since the Middle Pleistocene. During the Late Pleistocene, steppe bison occupied a variety of biome types: from the mosaic of temperate summergreen forest and steppe/temperate grassland (Serbia) to the tundra biomes (Siberia and Alaska). Despite the differences in the identified biome types, the diet of steppe bison did not differ significantly among populations in Eurasia. DMTA classified it as a mixed forager in all populations studied. The DMTA of Bb1 bison-a recently identified genetically extinct sister-clade of Bison bonasus-was typical of a highly grazing bovid species and differed from all B. priscus populations. The results of the study temper the common perception that steppe bison were grazers in steppe habitats. The dietary plasticity of the steppe bison was lower when compared with modern European bison and may have played an important role in its extinction, even in the stable tundra biome of eastern Siberia, where it has survived the longest in all of Eurasia.

Genetic and morphological differences among relict marginal occurrences of Stenobothrus eurasius (Orthoptera)

Steppes form large zonal habitats in Asia but only consist of localised outposts in Europe. An ideal subject for the study of differences within species between the main steppe zone and the localized more western outposts is the Orthopteran Stenobothrus eurasius, widespread across the Siberian and Central Asian steppes but present only in isolated relic populations at the western edge of its area. We used genetic and morphological analyses to detect possible differences among these relic populations. We carried out a study on morphological parameters of wings in parallel with the comparison of four DNA fragments (cytochrome c oxidase subunit I, 12S rRNA and the mtDNA control region, cytochrome B, nuclear internal transcribed spacers plus the 5.8S rRNA region) involving 15 extrazonal populations of the species. St. nigromaculatus was used as an outgroup taxon in the genetic analyses. Variability of the morphological characters of St. eurasius individuals was higher within the regions than amongst the regions. The two Stenobothrus species were not separated based on the CR gene. Samples of both Stenobothrus species were separated on the COI, cytB and ITS1-5.8S-ITS2 phylogenetic trees with high support (PP = 1) in Bayesian analyses but clear genetic lineages were not revealed, and populations of the focal species were not grouped according to their geographic locations. The similarity of this species in different steppe outposts supports the hypothesis that St. eurasius was widespread in the more extensive steppe areas that were once present, but the extension of agricultural landuse reduced the steppe habitats resulting in the current patchy distribution of St. eurasius limited to the remaining habitats.

Landscape features influencing gene flow and connectivity of an endangered passerine.

Dispersal of individuals and gene flow are crucial aspects to maintain genetic diversity and viability of populations, especially in the case of threatened species. Landscape composition and structure may facilitate or limit individual movement within and among populations. We used a landscape genetics approach to assess the connectivity patterns of the threatened Dupont's lark (Chersophilus duponti subsp. duponti), considering their genetic patterns and the landscape features associated with its gene flow in Spain. We analysed the genetic relatedness based on 11 species-specific polymorphic microsatellites on 416 Dupont's lark individuals sampled across peninsular Spain between 2017 and 2019, covering most of the European distribution of the species. To assess the relationship between the landscape composition and the species gene flow, we estimated genetic distance at the individual level (Dps). Next, we built a set of environmental surfaces from two time periods (years 1990 and 2018), based on factors such as land use and topography, influencing individuals' movement. We then obtained resistance surfaces from an optimization process on landscape variables. Landscape genetics analyses were done for single and composite surface models for each year separately. Our findings from both time points show that scatter or mosaic-structured vegetation composed by low agricultural and tree cover and high presence of sclerophyllous shrubs favoured Dupont's lark dispersal, while dense and continuous tree cover, as well as areas of intensive agriculture, were limiting factors. Our results suggest the importance of steppe habitat patches for the species' establishment and dispersal. In addition, our results provide key information to develop conservation measures, including conserving and restoring steppe habitats as scattered and/or mosaic-structured vegetation that could warrant the connectivity and persistence of Dupont's lark populations.

Unraveling spatial agglomeration patterns in agri-environmental schemes: Evidence from the improvement of steppe habitats in the Natura 2000 network in Catalonia (Spain)

The European payment for ecosystem services in the agricultural sector, or agri-environmental schemes (AES), have shown limited success in stopping biodiversity loss due to the mismatches between the scale at which they are adopted and the scale of ecological processes. This study analyzes the spatial distribution of farmer participation in the “Improvement of the steppe habitats of the Natura 2000 Network” AES in Catalonia (Spain) to test and explain potential agglomeration patterns. Our findings evidence spatial agglomeration of AES enrollment both within the farm (with farmers enrolling their adjacent or nearby plots in the scheme) and among farms (with farmers that adopt AES being near each other). Plots under the Natura2000-AES are located within a maximum distance of 2.4 km from their nearest enrolled plots, which would provide sufficient habitat continuum to allow for birds’ mobility across landscapes. Our results also indicate that participation concentrates on larger, non-irrigated and/or fallow plots, farms that are managed by professionals, young farmers, and/or members of a farmer organization, and municipalities with lower socioeconomic indexes. These results contradict the assumption that there are no agglomeration patterns in the AES context and reveal the interest of further studying the socio-ecological factors that underlie spatial agglomeration patterns of AES and designing landscape-management strategies accordingly.

Alces alces and Rangifer tarandus in the Pleistocene of Bulgaria (Artiodactyla: Cervidae)

An analysis of the past geographical and altitudinal distribution of bone remains of the elk (Alces alces) and reindeer (Rangifer tarandus) in Bulgaria is given. The data from seven fossil localities (Early–Late Pleistocene) from four provinces in the country are presented. The fossil record in Bulgaria shows the wide distribution of both deer species in the plain and hilly landscapes in the Danubian Plain in northern Bulgaria. No record of the two species has been known from Bulgaria south of the Stara Planina Mts. The localities of both species are spread over 250–750 m a. s. l., but majority of the findings are located at 335–390 m a. s. l. of the open steppe habitats. All data originate from the prehistoric cave dwellings of the Paleolithic people.

Investigation on the true identity of Entomobrya nigriventris Stach, 1929 (Collembola, Entomobryidae) with the description of a new species

The present paper gives a detailed and illustrated redescription of Entomobrya nigriventris Stach, 1929, and the description of a new species collected from open sand steppe habitat in Hungary. Based on the colour pattern, E. arenaria Winkler, Flórián & Dányi, sp. nov. is close to E. violaceolineata Stach, 1963 but differs from it by the morphology of the labral papillae and the dorsal macrochaetotaxy of the head, Th II, and Abd II–IV. The new species is also characterised by dark ventral body colouration in adult specimens. In this regard, an overview of European Entomobrya species in which the dark ventral side may occur is also provided.

Is tourism impacting pumas in the Torres del Paine UNESCO Biosphere Reserve in southern Chile?

Ecotourism generates $7.6 trillion annually and supports 292 million jobs around the world, and because of these benefits, it has been emphasized as a conservation strategy. Ecotourism, however, is not the solution for every community, and there is growing evidence that tourism can have unintended consequences for local people and wildlife, unless well managed. Here, we assessed the relative impacts of anthropogenic activities related to tourism (e.g. road density, distance to ranches and camping areas) and prey distributions on puma occupancy and abundance in the open steppe habitat of the southeast portions of the Torres del Paine UNESCO Biosphere Reserve, where pumas are protected. In winter, puma abundance and occupancy were explained by both prey and anthropogenic metrics. In summer, puma abundance was explained by both prey and anthropogenic metrics, but occupancy only by anthropogenic metrics. Across both periods, puma abundance was only explained by anthropogenic metrics, and occupancy was explained by both prey and anthropogenic metrics. Guanacos, the most important prey species for local pumas, never appeared in any top model, except in summer, during which puma abundance was explained by lower not higher guanaco abundance. Not unexpectedly, puma abundance and occupancy were negatively correlated with trail and road density across all analyses. In the high tourism season of summer, roads had 2–3 times the impact on puma abundance than prey metrics in top models. During our study, the average number of monthly visitors per month in summer (November-January) was 892 % higher than winter (May- July). As a whole, we believe our analyses suggest that tourism may be negatively impacting pumas, but the severity of this impact remains questionable. Future work should include studying stress in puma populations experiencing heavy tourism, simultaneous with the work needed to understand relative thresholds of impact on puma fitness metrics (e.g. survival, hunting success). We believe our work also highlights the need for standards and guidelines to be created and adopted among those involved in puma tourism in Torres del Paine and beyond.

Rapid functional but slow species diversity recovery of steppe vegetation on former arable fields in southern Ukraine

AbstractQuestionsEuropean steppes are among the most threatened ecosystems in the Palaearctic region, mainly because of conversion to arable land. Abandonment may allow for the passive recovery of steppes. We made use of an exceptional old‐field succession chronosequence of nearly 100 years to answer the following questions: (a) Are the plant species composition, species richness and functional characteristics typical of virgin grass steppes able to self‐restore during ca. 100 years after abandonment? (b) Do the rates of recovery of the above vegetation characteristics differ over the studied chronosequence? (c) Do topsoil carbon and nitrogen content change over the succession chronosequence, leading to concentrations similar to that of virgin steppes?LocationSouthern Ukraine.MethodsWe sampled vegetation and soil in a virgin grass steppe and in old fields abandoned for 6, 15, 31, 50 and ca. 97 years. We subjected the composition data to multivariate analysis. To test whether species richness, functional and soil characteristics of the old fields diverge from those of the virgin steppe, we used one‐way analysis of variance with Tukey's honestly significant difference (HSD) statistic to create 90% confidence intervals.ResultsThe vegetation composition of the three most recently abandoned old fields differed significantly from that of the virgin steppe. The species richness of vascular plants was lower in old fields than in the virgin steppe. The share of steppe habitat specialists was similar to the virgin steppe only in the field abandoned for ca. 97 years. Functional characteristics were significantly different from the virgin steppe only in the most recently abandoned old field. Contents of Corg and Ntot in fields abandoned for ≤50 years were lower compared with the virgin steppe.ConclusionsThe functional characteristics of steppe vegetation seem to recover much faster than its biodiversity. However, based on our results, 100 years can be enough time for the spontaneous re‐establishment of typical steppe vegetation.

Changes in the wild bee community (Hymenoptera: Apoidea) over 100 years in relation to land use: a case study in a protected steppe habitat in Eastern Austria

The wild bee community of a sand steppe habitat in Eastern Austria was surveyed in the years 2018 and 2019, complemented with historical data from over 100 years, and analyzed in relation to land use change. The mapping of land use categories was based on historical aerial photographs and orthophotos. Changes in bee community composition were analyzed by a multivariate statistical approach and took ecological traits into account (lecty, nesting type, habitat requirements, flight period, parasitism). In total, 310 bee species were recorded in the area, with the oldest records dating back to 1882. The bee species composition differed significantly among four defined time periods. Across the two most intensively sampled time periods (1931–1966 vs 2001–2021), a decline in species richness of over 50% was observed. We observed a disproportionally high decline of steppe- and sand-associated species, and a distinct shift from ground nesting species to above-ground nesting species. The area covered with woods increased from 1966 to 2018, while the total area covered with grassland and fallows decreased slightly between 1966 and 1994. The oligolectic species assemblage was specialized on Dipsacaceae, Brassicaceae and Fabaceae in the two earlier periods, and on Asteraceae and specifically on Carduoideae during the two later ones.Implications for insect conservationstronger reference to historic land management practices as short time periods of intensive grazing and small-scaled, staggered mowing would be desirable to improve the habitat quality. More drastic measures, such as removal of the topsoil in some parts and changes in the landscape re-establishing exposure to wind erosion, might be necessary, if the area is to be fully restored to the condition it was in a century ago.

Impact of livestock grazing on the terrestrial arthropod diversity in the arid zone of Mongolia

Arthropods play an essential role in steppe ecosystems. However, studies testing the overall response of terrestrial arthropods to overgrazing are scarce. The problem is particularly worrisome in Central Asia, while, to date, only a very few broader studies have been conducted in this region. We investigated how epigeic terrestrial arthropod assemblages respond to different livestock grazing pressure in two ecozones in SE Mongolia by examining their structure using pitfall traps. We also assessed which groups can be utilised as the most efficient indicators of grazing intensity. Our analyses demonstrated that the habitat type, grazing intensity, and the interaction of these variables had a significant effect on the overall species composition and abundance. However, the grazing intensity caused different changes in the composition of arthropod communities in both studied ecozones. Contrary to the semi-desert, in the steppe habitat, the grazing had the strongest impact in the moderately grazed site. It is most likely because steppe-dwelling species are more sensitive to loss of plant biomass and changes in habitat structure. We also found that the most representative species within and from different groups can react differently to changing grazing intensities, indicating with their presence the characteristics of the respective habitat. Such differences should also be considered when elaborating the management plan of conserved species but also when applying grazing management in different habitat types. Our survey is one of the most comprehensive in Central Asia and should help implement further, more targeted studies in the corresponding habitats.

Rediscovery of Gryllomorpha miramae Medvedev, 1933 (Orthoptera: Gryllidae: Gryllomorphinae) in Ukraine

Gryllomorpha miramae Medvedev, 1933 was collected in Zaporizhzhia and Kherson Regions of Ukraine. These are the first records of the species within Ukraine since more than 60 years from previous (and the first) record of the species within Zaporizhzhia Region. The species was found within intact and damaged steppe habitats. Our investigation shows that middle-age larvae demonstrate typical for the species coloration and shape of denticles of outer surface of hind tibia. This contribution provides first COI sequence for G. miramae.

Male-Biased Parasitism of Brandt's Voles (Lasiopodomys brandtii) in Inner Mongolia, China.

The abundance and prevalence of parasitic infection often vary in different host sexes, and this phenomenon has been named sex-biased parasitism. Brandt's voles are the dominant rodent species in typical steppe habitat and are widely distributed in Inner Mongolia, China, but the prevalence of parasites in Brandt's voles are poorly reported. In this study, we investigated the prevalence of six intestinal parasites in Brandt's voles in May, June, July, and August 2022 around the Xilingol Grassland in Inner Mongolia, China. The results showed that Syphacia obvelata, Aspiculuris tetraptera, and Trichostrongylidae family were the dominant intestinal parasites in Brandt's voles that we captured in this study, and the infection rates of the three parasites were significantly higher in males than females, which showed obvious male-biased parasitism. Season and human activities such as grazing had no significant effect on the infection rates for different parasites, while the parasite reproduction level was higher when the ambient temperature was around 18 °C. Sexual size dimorphism was ubiquitous in Brandt's voles, and it was mainly manifested by the differences in body weight and length between males and females. Simple linear regression analysis showed a significant positive correlation between bodyweight and parasite infection rates, so the sex-biased parasitism in Brandt's voles could be explained by the body size hypothesis, as a larger body could provide more ecological niches for parasitic infection.

Trophic Structure of the Soil-Dwelling Arthropod Communities at the Border of the Forest and the Steppe in the South of Western Siberia: Isotopic Data

Epigeic generalist predators play a crucial role in terrestrial ecosystems, connecting aboveground and belowground food webs. Using stable isotope compositions (δ13C and δ15N values), we assessed the trophic niches of the two main groups of generalist predators (ground beetles (Coleoptera, Carabidae) and spiders (Arachnida: Aranei)), as well as their potential prey (phytophagous and saprophagous insects), plants, and soils in the forest, steppe, and transitional ecosystems located in the forest–steppe of southwestern Siberia. We hypothesized that (1) the trophic niche of carabids is wider than that of spiders, because some ground beetles are omnivorous, and (2) the contribution of invertebrates from the detrital food web (saprophages) to the diet of generalist predators is higher in the “detrital” forest ecosystem than in the steppe, which should be reflected in increased δ13C and δ15N values of the predators in the forest. In total, 16 species of carabid and 17 species of spider were analyzed. The δ15N values of ground beetles suggested a wide range of trophic niches corresponding to two or three trophic levels. Omnivorous carabids of the genera Amara and Harpalus had the minimum δ15N values. The carbon isotope compositions of the ground beetles suggests that most predatory species were predominantly involved in grazing food chains. Spiders had on average increased δ15N values compared to ground beetles, and a relatively narrow range of δ15N values. The isotopic niche occupied by spiders hardly overlapped with the isotopic niche of carabids, which may indicate a significant difference in the range of consumed resources. Thus, our data suggest a significant difference in the trophic niches of the key generalist predators, ground beetles and spiders, which was observed both in the forest and the steppe habitats. Spiders appear to be more closely associated with detrital food webs than ground beetles. Contrary to our expectations, we did not find higher δ13C and δ15N values in ground-dwelling generalist predators in the forest compared to the steppe ecosystem.

Dietary niche overlap and resource partitioning among six steppe passerines of Central Spain using DNA metabarcoding

Trophic niche partitioning is a mechanism that facilitates the coexistence of ecologically similar species by sharing their resource use. However, detailed information of the trophic niche in insectivorous birds is usually limited by the lack of accurate identification of consumed food resources. The use of DNA metabarcoding has proved useful for molecular identification of the taxa present in bird faecal samples. Here, we used this molecular technique to study the diets of six steppe passerine species distributed in two Special Protection Areas in central Spain, and to characterize the dietary niche overlap and the prey composition differences between bird species. In total, we distinguished 112 diet items, covering 39 arthropod families of 13 orders. Although significant dietary differences existed in prey species composition, our results indicated a 74% overlap in steppe bird dietary niche, mostly due to high consumption of abundant arthropod prey such as beetles, grasshoppers and spiders in the breeding season by all bird species. The lowest overlap was found for the dietary niches of the Greater Short‐toed Lark Calandrella brachydactyla and Dupont's Lark Chersophilus duponti, a scarce and threatened species, which appeared to be the species with the most distinct dietary niche within the community. Our results make a significant contribution to the knowledge of shrub‐steppe bird diets and their trophic interactions, indicating that some extent of interspecific resource partitioning occurs in the study area, notably between Dupont's Lark and the Greater Short‐toed Lark. Our study demonstrates the value of DNA metabarcoding in the assessment of passerine diets and provides useful ecological results for the design of biodiversity conservation programmes in the increasingly scarce and threatened steppe habitats.

Co‐occurrence patterns in a steppe bird community: insights into the role of dominance and competition

Spatial co‐occurrence patterns are determined by environmental factors, such as food availability or habitat characteristics and by biotic associations. When resources are limited, competition which implies a dominant hierarchy can shape species assemblage. Here, we study space and time co‐occurrence of steppe passerines during the breeding season in a natural steppe habitat, its modulation by environmental filtering, potential biotic interactions and random processes. We applied the joint species distribution model of hierarchical modelling of species community (HMSC) to data on species presence–absence and environmental, temporal and spatial covariates acquired from seven plots in a natural steppe in central Spain during two consecutive years. Our results reveal the patterns of bird species co‐occurrence and suggest that this assemblage might be competitively structured. The assemblage appears to be configured around one dominant species, the Eurasian skylark, which establishes principally negative associations with many of the coexistent species. Our results contribute to the understanding of how competition and dominance processes, together with ecological constraints and other biotic associations, shape bird assemblages.

Vascular plants of old cemeteries in the Lower Dnipro region (Southern Ukraine).

The dataset contains the records of vascular plant species occurrences and distribution in old cemeteries (OC) of the Lower Dnipro region (Southern Ukraine). The analysed cemeteries were located in different types of landscapes (agricultural, rural and urban) and represent various ways of using their area (currently used, closed, abandoned). The floristic list includes 440 species of vascular plants (437 in situ, 3 ex situ). The dataset demonstrates a sozological (Red-lists species) value of old cemeteries in Southern Ukraine. The cemeteries constitute refuges of native, rare and steppe flora and play a role of steppe habitat islands in a landscape almost completely transformed to arable land or urbanised. This is the first dataset which contains information about flora of old cemeteries in Lower Dnipro region (Southern Ukraine). The dataset comprises 2118 occurrences of vascular plants (440 species) recorded in the years 2008-2021 in 13 old cemeteries of the Lower Dnipro region. The dataset includes information about 85 occurrences of rare species (23 species in situ, 3 ex situ) and 652 occurrences of 117 steppe species.

The first dataset of vascular plant species occurrences on kurgans in Southern Ukraine.

The dataset contains the records of vascular plant species occurrences and distribution on Ukrainian kurgans (burial mounds, barrows), located in various zones of steppe vegetation: desert steppe, grass steppe, herb-rich grass steppe and forest steppe. Much of the studied kurgans belongs to the territory historically known as the "Wild Fields". Besides the occurrence data, the publication presents a comparison of the floristic richness amongst five microhabitats distinguished on kurgans (top, northern slope, northern bottom, southern slope, and southern bottom) and amongst kurgans located in different steppe zones. The Original publication includes 721 species of vascular plants) within four vegetation zone (desert steppe, grass steppe, herb-rich grass steppe and forest steppe). The report shows also sozological value of kurgans in southern Ukraine, as they play a role of steppe habitat islands in a landscape almost completely transformed to arable land. The obtained flora inventory was analyzed in various aspects. This occurrence dataset is the first public record of species from kurgans in Ukraine. This is the first occurrence dataset from kurgans in Ukraine. The dataset includes 28,456 occurrences of vascular plants recorded in the years 2004-2009 on Ukrainian kurgans. The dataset includes information about 1446 occurrences of rare species on kurgans (69 species). It contains information on the kurgan flora within four vegetation zone (desert steppe, grass steppe, herb-rich grass steppe and forest steppe) on the area ca. 32000 km2. Of the approximately 450 mounds visited, the ones with the best preserved vegetation cover were selected. For each of 106 investigated mounds, floristic lists from five microhabitats were compiled - 530 lists in total.

Saving raptors in Mongolia: country-scale retrofitting of insulation to reduce avian electrocution at power lines

The delivery of electricity to widely dispersed communities across the open steppe grasslands of Mongolia depends on medium-voltage (10–35 kV) distribution lines, often carrying power over substantial distances. Previously utilizing wooden supports, upgraded and new distribution lines are now designed to be cheaper, using steel-reinforced concrete poles with galvanized steel crossarms that can carry an electrical charge to the ground. Consequently, any bird that perches on these poles and simultaneously touches a conducting cable can be electrocuted, which is a significant risk for medium to large-sized birds at 10 kV and 15 kV lines utilizing pin-insulators. Surveys and monitoring of these dangerous power lines revealed that raptor electrocution rates were high, especially in areas with abundant prey, and widespread across steppe habitats. With around 3,500 km of hazardous lines in the Mongolian steppe zone, it was estimated around 18,000 raptors, including 4,000 Saker Falcons, were electrocuted each year. Experimental trials indicated that retrofitting insulation could significantly reduce electrocution risk. However, off-the-shelf mitigation equipment was either not suitable or too expensive to be deployed at scale in Mongolia. Consequently, we designed and manufactured our own equipment to meet our six criteria of being (i) effective, (ii) durable, (iii) failsafe with (iv) no impact on power supply, (v) simple to install and (vi) low cost. This equipment comprises acrylonitrile styrene acrylate (ASA) insulation covers that fit over the crossarms and a concrete pole tops of standard line poles, suitable for retrofitting existing lines and being incorporated into new lines. Over to 34,425 poles at 67 power lines covering a linear distance of 3,450 km, at an equipment cost of less than USD $40 per pole. Comparison of carcass counts indicated a significant reduction in electrocution events. To our knowledge, this is the largest single powerline retrofitting project globally, demonstrating that effective mitigation can be deployed at scale, saving tens of thousands of raptors from electrocution for a relatively low cost. We hope to use this project as an exemplar to focus attention and attract funding to address the issue of raptor electrocution at a global scale.