The purpose of the publication is to indicate potentially important areas for the presence of the Eurasian lynx (Lynx lynx) within the Transcarpathian region in Ukraine using GIS modeling tools to ...optimize the network of protected areas. The modeling consisted of a preliminary analysis of the following five parameters that are important for the life of the species: type of land cover, proximity of non-forest biotopes to forest biotopes, high-altitude bioclimatic zones, degrees of relief dissection, distance from settlements and roads. A comprehensive GIS analysis of these parameters made it possible to establish that the total area of territories that are potentially suitable for the presence of the Eurasian lynx within the Transcarpathian region is 192.6 thousand hectares, and covers about 9.9% of the territory of the region. The most suitable areas are concentrated in the mountainous southeastern part of the region within the orographic ecoregion of the elevated dissected highlands. Within the modeled habitats, there are often places where real signs of the species’ distribution have been recorded. In the second stage of the research, a cartographic model “Territories of the potential presence of the Eurasian lynx (Lynx lynx) and key areas of the regional ecological network of the Transcarpathian region” was obtained, where population, reproduction and other areas, as well as the degree of nature protection in these areas, were established.
ABSTRACT
Predation on ungulates exposes large predators to conflicts with farmers and hunters if they kill livestock and shared game species. Therefore, it is crucial to know the drivers of predation ...on large prey, understand how they differ from predation on smaller prey and reveal general large‐scale patterns.
We tested three hypotheses in the global Eurasian lynx Lynx lynx population: 1) consumption of ungulates and hares increases with their densities, 2) effects of predictors on ungulate and hare predation differ between continents, latitudes, longitudes and landscapes, 3) effects of predictors are generally applicable regardless of study materials (scats, carcasses and intestinal tracts).
We collected information from 70 publications, including data from 174 study cases (107 from Europe and 67 from Asia) and 114 sites in 30 countries, mainly Russia (73 cases and 46 sites). Linear regression of logit‐transformed data and logistic regression were used to test the hypotheses.
We found that ungulates made up more than half of the lynx diet in areas containing at least 570 individual ungulates/100 km2 and/or located south of 56°N. Predominance of ungulates in the diet could be related to the higher availability of the main medium‐sized ungulate prey species, and to the presence of (mixed) broadleaf deciduous forests with open spaces providing optimal hunting conditions. No significant effects on hare consumption by lynx were revealed, possibly because of a small sample size of hare density data from lynx habitats, fluctuations and instability of hares as a food resource, declines of some hare populations and separation in habitat use by lynx and hares.
We conclude that the Eurasian lynx is an adaptable predator, not a lagomorph specialist; throughout its range, the lynx takes ungulates according to their availability. The use of practical nonlethal interventions is important to limit the availability of domestic ungulates (livestock and game) for predation by lynx, and to promote human‐lynx coexistence.
Effects of latitudes and ‘main ungulate’ densities on ungulate occurrence in the diet of the Eurasian lynx Lynx lynx. Ungulates made up more than half of the Eurasian lynx diet in the areas containing at least 570 ungulates/100 km2 and/or located south of 56°N. This could be related to the higher availability of the main medium‐sized ungulate prey, and to the presence of (mixed) broadleaf deciduous forests with open spaces providing optimal hunting conditions. We did not find variables strongly affecting hare consumption by the lynx throughout its range, possibly because of a small sample size of hare density data from lynx habitats, fluctuations and instability of hares as a food resource, declines of some hare populations and separation in habitat use by lynx and hares. We conclude that the Eurasian lynx is an adaptable predator taking ungulates according to their availability. The use of practical nonlethal interventions is important to limit the availability of domestic ungulates (livestock and game) to predation by lynx and thus to promote human‐lynx coexistence.
Aim
The recent recovery of large carnivores in Europe has been explained as resulting from a decrease in human persecution driven by widespread rural land abandonment, paralleled by forest cover ...increase and the consequent increase in availability of shelter and prey. We investigated whether land cover and human population density changes are related to the relative probability of occurrence of three European large carnivores: the grey wolf (Canis lupus), the Eurasian lynx (Lynx lynx) and the brown bear (Ursus arctos).
Location
Europe, west of 64° longitude.
Methods
We fitted multi‐temporal species distribution models using >50,000 occurrence points with time series of land cover, landscape configuration, protected areas, hunting regulations and human population density covering a 24‐year period (1992–2015). Within the temporal window considered, we then predicted changes in habitat suitability for large carnivores throughout Europe.
Results
Between 1992 and 2015, the habitat suitability for the three species increased in Eastern Europe, the Balkans, North‐West Iberian Peninsula and Northern Scandinavia, but showed mixed trends in Western and Southern Europe. These trends were primarily associated with increases in forest cover and decreases in human population density, and, additionally, with decreases in the cover of mosaics of cropland and natural vegetation.
Main conclusions
Recent land cover and human population changes appear to have altered the habitat suitability pattern for large carnivores in Europe, whereas protection level did not play a role. While projected changes largely match the observed recovery of large carnivore populations, we found mismatches with the recent expansion of wolves in Central and Southern Europe, where factors not included in our models may have played a dominant role. This suggests that large carnivores’ co‐existence with humans in European landscapes is not limited by habitat availability, but other factors such as favourable human tolerance and policy.
Polar bears (
Ursus maritimus
), Eurasian lynx (
Lynx lynx
) and snow leopards (
Panthera uncia
) are elusive large carnivores inhabiting snow-covered and remote areas. Their effective conservation ...and management are challenged by inadequate population information, necessitating development of novel data collection methods. Environmental DNA (eDNA) from snow tracks (footprints in snow) has identified species based on mitochondrial DNA, yet its utility for individual-based analyses remains unsolved due to challenges accessing the nuclear genome. We present a protocol for capturing nuclear eDNA from polar bear, Eurasian lynx and snow leopard snow tracks and verify it through genotyping at a selection of microsatellite markers. We successfully retrieved nuclear eDNA from 87.5% (21/24) of wild polar bear snow tracks, 59.1% (26/44) of wild Eurasian lynx snow tracks, and the single snow leopard sampled. We genotyped over half of all wild polar bear samples (54.2%, 13/24) at five loci, and 11% (9/44) of wild lynx samples and the snow leopard at three loci. Genotyping success from Eurasian lynx snow tracks increased to 24% when tracks were collected by trained rather than untrained personnel. Thirteen wild polar bear samples comprised 11 unique genotypes and two identical genotypes; likely representing 12 individual bears, one of which was sampled twice. Snow tracks show promise for use alongside other non-invasive and conventional methods as a reliable source of nuclear DNA for genetic mark-recapture of elusive and threatened mammals. The detailed protocol we present has utility for broadening end user groups and engaging Indigenous and local communities in species monitoring.
Trace element pollution can adversely affect the brains of individuals and thus impact the entire population of apex predators, such as large European carnivores. We assessed exposure to prominent ...neurotoxicants As, Cd, Hg and Pb by measuring their brain stem levels in brown bears (
= 114), grey wolves (
= 8), Eurasian lynx (
= 3), and golden jackals (
= 2) sampled in 2015-2022 in Croatia. The highest of the non-essential elements was the Pb level in the bears' brains (median, Q1-Q3; 11.1, 7.13-24.1 μg/kg wet mass), with 4% of animals, all subadults, exceeding the established normal bovine levels (100 μg/kg wet mass). Species-specific differences were noted for Ca, Cd, Cu, Fe, Pb and Se brain levels. Female brown bears had higher As brain levels than males. Cubs and yearlings had lower brain Cd, but higher Zn, while subadults had higher Cu than adult bears. Hepatic As, Cd, Cu and Hg levels were shown to be a moderate proxy for estimating brain levels in bears (r
= 0.30-0.69). Multiple associations of As, Cd, Hg and Pb with essential elements pointed to a possible interaction and disturbance of brain Ca, Cu, Fe, Se and Zn homeostasis. Non-essential element levels in the brains of four studied species were lower than reported earlier for terrestrial meso-carnivores and humans. The age and sex of animals were highlighted as essential factors in interpreting brain element levels in ecotoxicological studies of large carnivores.
Pterosaurs were the first vertebrates to evolve powered flight and the largest animals to ever take wing. The pterosaurs persisted for over 150 million years before disappearing at the end of the ...Cretaceous, but the patterns of and processes driving their extinction remain unclear. Only a single family, Azhdarchidae, is definitively known from the late Maastrichtian, suggesting a gradual decline in diversity in the Late Cretaceous, with the Cretaceous-Paleogene (K-Pg) extinction eliminating a few late-surviving species. However, this apparent pattern may simply reflect poor sampling of fossils. Here, we describe a diverse pterosaur assemblage from the late Maastrichtian of Morocco that includes not only Azhdarchidae but the youngest known Pteranodontidae and Nyctosauridae. With 3 families and at least 7 species present, the assemblage represents the most diverse known Late Cretaceous pterosaur assemblage and dramatically increases the diversity of Maastrichtian pterosaurs. At least 3 families-Pteranodontidae, Nyctosauridae, and Azhdarchidae-persisted into the late Maastrichtian. Late Maastrichtian pterosaurs show increased niche occupation relative to earlier, Santonian-Campanian faunas and successfully outcompeted birds at large sizes. These patterns suggest an abrupt mass extinction of pterosaurs at the K-Pg boundary.
Landscape connectivity is essential for the conservation of large carnivores, particularly in highly fragmented landscapes. Despite was nearing extinction, the Eurasian lynx (Lynx lynx) recovers in ...Europe, owing to reintroduction projects that have re-established several subpopulations. However, some of these subpopulations are small and isolated, possibly incurring into reduced genetic diversity. To establish a functional metapopulation in Europe, facilitating lynx movements is crucial, and connectivity modeling could support the identification of optimal solutions to connect these subpopulations. Here, we assessed habitat connectivity for the Eurasian lynx in current and future scenarios, between the European subpopulations, applying two different modeling approaches, namely Circuit theory-based and least-cost path techniques. Moreover, we evaluated the potential of European Protected Areas (EPAs) to form an ecological network able to connect lynx subpopulations. Our results show that several connections occur between Jura, Alpine, Bohemian-Bavarian-Austrian (BBA), and Dinaric populations, while Balkan is less connected. Moreover, the Carpathian population has the potential to act as a source for the BBA subpopulation, if properly connected. We report that, currently, only 21 % of the crucial corridors are covered by EPAs, and those are often disturbed by human infrastructures. High connectivity among EPAs occurs in Central and Eastern Europe, and among the Carpathian, BBA and Alpine subpopulations. However, unprotected areas appear between the Carpathian, the BBA, the Baltic, and the Balkans subpopulation. To enhance those connections, we test the Agenda 2030 goals, and find those functional for management actions focusing on dispersal corridors, also proving that transboundary cooperation is pivotal.
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Humans, as super predators, can have strong effects on wildlife behaviour, including profound modifications of diel activity patterns. Subsequent to the return of large carnivores to human‐modified ...ecosystems, many prey species have adjusted their spatial behaviour to the contrasting landscapes of fear generated by both their natural predators and anthropogenic pressures. The effects of predation risk on temporal shifts in diel activity of prey, however, remain largely unexplored in human‐dominated landscapes.
We investigated the influence of the density of lynx Lynx lynx, a nocturnal predator, on the diel activity patterns of their main prey, the roe deer Capreolus capreolus, across a gradient of human disturbance and hunting at the European scale.
Based on 11 million activity records from 431 individually GPS‐monitored roe deer in 12 populations within the EURODEER network (http://eurodeer.org), we investigated how lynx predation risk in combination with both lethal and non‐lethal human activities affected the diurnality of deer.
We demonstrated marked plasticity in roe deer diel activity patterns in response to spatio‐temporal variations in risk, mostly due to human activities. In particular, roe deer decreased their level of diurnality by a factor of 1.37 when the background level of general human disturbance was high. Hunting exacerbated this effect, as during the hunting season deer switched most of their activity to night‐time and, to a lesser extent, to dawn, although this pattern varied noticeably in relation to lynx density. Indeed, in the presence of lynx, their main natural predator, roe deer were relatively more diurnal. Overall, our results revealed a strong influence of human activities and the presence of lynx on diel shifts in roe deer activity.
In the context of the recovery of large carnivores across Europe, we provide important insights about the effects of predators on the behavioural responses of their prey in human‐dominated ecosystems. Modifications in the temporal partitioning of ungulate activity as a response to human activities may facilitate human–wildlife coexistence, but likely also have knock‐on effects for predator–prey interactions, with cascading effects on ecosystem functioning.
Translated
Résumé
Les humains, en tant que ‘super‐prédateurs’, peuvent avoir des effets importants sur le comportement de la faune sauvage, y compris des modifications profondes de leurs rythmes circadiens d'activité. A la suite du retour des grands carnivores dans les écosystèmes anthropisés, de nombreuses espèces proies ont ajusté leur comportement spatial à ces paysages de la peur contrastés, générés à la fois par les pressions liées aux risques anthropiques et à la présence de leurs prédateurs naturels. Les effets du risque de prédation sur les modifications temporelles des rythmes circadiens d'activité des proies restent cependant largement inconnus dans les écosystèmes dominés par l'homme.
Ici, nous avons étudié l'influence de la densité de lynx Lynx lynx, un prédateur nocturne, sur les rythmes circadiens d'activité de leur proie principale, le chevreuil Capreolus capreolus, à travers un gradient de pressions anthropiques à l’échelle Européenne.
Sur la base de plus de 11 million de données d'activité issues de 431 suivis individuels de chevreuils équipés de colliers GPS provenant de 12 populations au sein du réseau EURODEER (http://eurodeer.org), nous avons analysé comment le risque de prédation par le lynx, associé aux risques létaux et non‐létaux des activités humaines, influence la diurnalité des chevreuils.
Nous avons démontré une forte plasticité des rythmes circadiens d'activité des chevreuils en réponse aux variations spatio‐temporelles du risque, et notamment face aux activités humaines. Plus particulièrement, les chevreuils diminuent leur degré de diurnalité d'un facteur de 1.37 lorsque le dérangement humain est important. La chasse accentue cet effet, puisque durant la saison de chasse les chevreuils basculent la plupart de leur activité de nuit, et dans une moindre mesure, durant l'aube également, bien que ce patron soit essentiellement variable en fonction de la densité de lynx. En effet, en présence de lynx, leur principal prédateur, les chevreuils sont relativement plus diurnes. Globalement, nos résultats révèlent une forte influence des activités humaines et de la présence de lynx sur l'ajustement des rythmes circadiens d'activité des chevreuils.
Dans le contexte du retour des grands carnivores en Europe, notre étude apporte de nouvelles connaissances sur les effets des prédateurs sur la réponse comportementale de leur proie dans des écosystèmes anthropisés. La modification de la répartition temporelle de l'activité des ongulés en réponse aux activités humaines pourrait être un facteur facilitant la coexistence homme‐faune sauvage, avec toutefois des conséquences autres sur les interactions prédateurs‐proies et leurs effets en cascade sur le fonctionnement des écosystèmes.
The authors compared diel activity of roe deer across 12 European populations. Deer were more nocturnal when human disturbance was high, but more diurnal in the presence of lynx, their main natural predator. Modifications in the temporal partitioning of ungulate activity likely have knock‐on effects for a variety of ecological processes. Photo credit: Nicolas Cèbe (CEFS‐INRA).
Interactions among coexisting mesocarnivores can be influenced by different factors such as the presence of large carnivores, land‐use, environmental productivity, or human disturbance. Disentangling ...the relative importance of bottom‐up and top‐down processes can be challenging, but it is important for biodiversity conservation and wildlife management. The aim of this study was to assess how the interactions among mesocarnivores (red fox Vulpes vulpes, badger Meles meles, and pine marten Martes martes) were affected by large carnivores (Eurasian lynx Lynx lynx and wolf Canis lupus), land cover variables (proportion of agricultural land and primary productivity), and human disturbance, as well as how these top‐down and bottom‐up mechanisms were influenced by season. We analyzed 3 years (2018–2020) of camera trapping observations from Norway and used structural equation models to assess hypothesized networks of causal relationships. Our results showed that land cover variables were more strongly associated with mesocarnivore detection rates than large carnivores in Norway. This might be caused by a combination of low density of large carnivores in an unproductive ecosystem with strong seasonality. Additionally, detection rates of all mesocarnivores showed positive associations among each other, which were stronger in winter. The prevalence of positive interactions among predators might indicate a tendency to use the same areas and resources combined with weak interference competition. Alternatively, it might indicate some kind of facilitative relationship among species. Human disturbance had contrasting effects for different species, benefiting the larger mesocarnivores (red fox and badger) probably through food subsidization, but negatively affecting apex predators (wolf and lynx) and smaller mesocarnivores (pine marten). In a human‐dominated world, this highlights the importance of including anthropogenic influences in the study of species interactions.
We used 3 years of camera trap data from Norway to assess how the interactions among mesocarnivores (red fox, badger, and pine marten) were affected by large carnivores (Eurasian lynx and wolf), land cover variables, and human disturbance, as well as how these top‐down and bottom‐up mechanisms were influenced by season. Our results showed that land cover variables were stronger predictors of mesocarnivore activity than large carnivores in Norway. Human disturbance had contrasting effects for large carnivores and mesocarnivores. Humans can influence species through different top‐down and bottom‐up processes, which highlights the complexity of anthropogenic effects on species interactions.
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