Wildlife Movement Research Articles

Status of Mammals Entrapment in Open Irrigation Canals

Linear infrastructure such as roads, railways, and irrigation canals causes habitat fragmentation and disrupts wildlife movement, negatively impacting ecosystems. This study investigated the physical characteristics of 80 artificial structures across South Korea and analyzed the status of wildlife entrapment prevention facilities and mammal entrapment incidents within irrigation canals. The surveyed structures, including irrigation canals, drainage canals, and roadside ditches, had an average length of 2.57 km, width of 3.34 m, and height of 1.4 m. Most structures (88.8%) were concrete, while 11.3% were mixed concrete and earthen canals. Wildlife entrapment prevention facilities, including escape facilities, cross-movement structures, and avoidance guidance facilities, were installed at low rates. Mammals entrapment incidents were observed 620 cases, with Korean water deer (<i>Hydropotes inermis</i>) and common raccoon dog (Nyctereutes procyonoides) being the most frequently observed. Additionally, entrapment incidents involving the endangered Eurasian otter (<i>Lutra lutra</i>) and leopard cat (Prionailurus bengalensis) were also recorded. Escape facilities and guidance facilities showed no significant difference in the average occurrence rates of mammals, but the maximum occurrence rates were lower in sections where these facilities were installed. This study provides essential baseline data for policy development and management strategies aimed at mitigating wildlife entrapments and improving ecological connectivity in artificial linear infrastructure.

Seasonal and daily use of canal culverts by mammals, reptiles, amphibians, and invertebrates

AbstractLandscape connectivity is critical to the long‐term conservation of wildlife populations. Although anthropogenic linear infrastructures (ALI), including roads and canals, provide important resources to humans, they can affect wildlife through habitat fragmentation and reduced movement through landscapes. To increase landscape connectivity, crossing structures, including underpasses, can facilitate wildlife movement across landscapes experiencing ALI. However, little is known about how a suite of small‐ to medium‐sized species use underpasses across seasonal and daily time periods, especially for some ALI such as major canals. We used specialized camera technology (i.e., the Hobbs Active Light Trigger [HALT] camera) to evaluate use of culvert underpass crossing structures (hereafter culverts) along the Central Arizona Project canal, Arizona, by a suite of mammals, reptiles, amphibians, and invertebrates. Specifically, we evaluated (1) which wildlife species used culverts, (2) how the frequency of use varied across seasons (i.e., hot‐dry, hot‐wet, cool‐wet) and (3) daily activity patterns of wildlife using culverts. We detected 31 species of wildlife using culverts, which included small‐ to medium‐sized mammals (56.4% of crossings), reptiles (21.0% of crossings), amphibians (19.0% of crossings), and invertebrates (3.6% of crossings), including some species of conservation concern, such as the Sonoran Desert tortoise (Gopherus morafkai) and Gila monster (Heloderma suspectum). However, crossings by larger mammal species were less effectively detected with the HALT cameras. Reptile crossing frequency was similar between the 2 seasons that they were active during the hot‐dry (May–June) and hot‐wet (July–October) seasons and crossing frequency by some species of amphibians and invertebrates was higher in the hot‐wet season. Throughout the entire year, small mammals used culverts more frequently in hot seasons (i.e., hot‐wet and hot‐dry) compared to the cool‐wet (November‐March) season. In addition, daily activity patterns varied by species, where species crossed culverts during diurnal (e.g., desert spiny lizards, Sceloporus magister and coachwhip snakes, Masticophis flagellum), crepuscular (e.g., cottontail rabbits, Sylvilagus audubonii and western diamondback rattlesnakes, Crotalus atrox), and nocturnal (e.g., deer mouse species, heteromyid species, woodrat species, desert stink beetle species) time periods. Our information can be used to manage wildlife crossing areas and increase landscape connectivity in relation to ALI.

Are Domestic Dogs (Canis familiaris) the Family Scapegoats? A Systematic Review of Canine Distemper Virus in African Wildlife, 1978-2021.

Free-living wildlife across Africa is found across expansive rangelands, frequently interacting with pastoral communities, their livestock, and domestic dogs (Canis familiaris). African wildlife populations are threatened by development, poaching and disease. Infectious diseases have caused significant declines, sabotaging conservation efforts. Canine distemper virus (CDV) infections have increased in incidence in wildlife over the past four decades. Sympatric domestic dogs have been presumed to be the reservoirs of the virus for wildlife. A systematic review using Preferred Reporting Items for Systematic Reviews and Meta-Analyses 2020 guidelines was carried out to investigate CDV infections in wildlife in Africa, to 1) analyze the conservation concerns associated with the disease, 2) identify the dynamics of the virus across different ecoregions, and 3) ascertain the source of the virus for free-living wildlife. The database searches identified 65 articles relevant to the study questions and an additional 43 valuable for wider discussion of the topic area. Canine distemper outbreaks were reported to occur in wildlife in six African countries, with mortality rates between 30% and 94% across all species affected. Eleven wildlife species were identified as susceptible, 64% of which (7/11) are classified as threatened by the International Union for Conservation of Nature. Disease dynamics varied between ecoregions because of differences in land use; virus strains; climate change and concurrent infections; ecotones; domestic and wildlife population densities; wildlife monitoring capacity; and wildlife movement. Nine countries reported outbreaks in domestic dog populations in or near wildlife habitats, but none reported confirmed transmission to wildlife. Of 23 reports investigating the role of domestic dogs as CDV reservoirs, 14 (61%) concluded that domestic dogs acted as either reservoirs or sources of CDV for wildlife, four (17%) did not identify dogs as reservoirs, and five (22%) were not sure of the role played by domestic dogs. This review highlights the importance of integrating active CDV surveillance in wildlife conservation programs.

Challenges and Strategies in Elephant Conservation: A Comprehensive Review of Land Use Impact and Management Approaches in Dalma Wildlife Sanctuary, India

Abstract The Dalma Wildlife Sanctuary, a critical habitat for elephant conservation in the Dalma Landscape, is increasingly experiencing the multifaceted impacts of climate change. This study reviews secondary literature to examine the consequences of Land Use and Land Cover (LULC) changes on elephant populations, emphasizing the exacerbating effects of climate-induced alterations. The sanctuary faces challenges like habitat degradation and fragmentation, which impede wildlife movement and intensify human-wildlife conflicts, particularly with elephants. These issues are now compounded by climate change, which is altering vegetation patterns, water availability, and seasonal behaviours of wildlife, further straining the delicate balance of this ecosystem. This paper methodically dissects the literature, highlighting how climate change interplays with existing environmental stressors, affecting the conservation strategies and viability of elephant corridors. The review also considers management strategies, underscoring the need for adaptive measures that address the dual challenges of habitat degradation and climate change. By broadening the scope to include the climate change dimension, this research not only underscores the researcher’s comprehensive understanding of the sanctuary’s ecological challenges but also aligns the study with global environmental concerns, making it relevant in the context of contemporary wildlife conservation efforts. Through a structured approach, the paper is divided into sections that explore the sanctuary’s ecological significance, the factors impacting elephant populations with a focus on climate change, and methods for studying human-elephant conflicts in the context of a changing climate. This comprehensive analysis aims to identify research gaps, propose adaptive conservation strategies, and contribute to the broader understanding of how climate change is reshaping wildlife conservation paradigms.

Drought in south-west Australia links to urban immigration across multiple avian taxa

Background Urban areas are a significant and rapidly expanding part of the global landscape. Urban expansion occurs alongside climate change, with both linked to declines in native species. However, urban environments can offer alternative resources during extreme climatic events such as droughts. Aims We sought to identify bird species that had an increased presence in the major urban center of south-west Western Australia during a climate anomaly characterized by record low rainfall and high temperatures. Methods Using eBird data, we analyzed changes in the reporting rates of all bird species in the period from January 2019 to August 2024. Generalized linear models were used to assess the influence of cumulative 6-month, 12-month, and 18-month rainfall on species reporting rates. Key results Reporting rates increased dramatically (up to nine times higher than average) around the time of the drought, before reducing back to the average once the drought was broken for four species: (1) the black-shouldered kite; (2) the black-tailed native-hen; (3) the tawny-crowned honeyeater; and (4) the western spinebill. Cumulative 6-month rainfall was a strong predictor for the raptor and the two honeyeaters. Other similar species showed no significant change in reporting rate, suggesting the effect is highly species dependent. Conclusions Multiple different types of birds may utilize urban areas during drought events. Further research is needed to identify what drives movement of wildlife in response to such events, and the type of urban resources the birds are using. Implications Urban ecosystems should be integrated into broader conservation plans to support species through the interacting challenges posed by climate change and urbanization.

Leveraging Open-Source Geographic Databases to Enhance the Representation of Landscape Heterogeneity in Ecological Models.

Wildlife abundance and movement are strongly impacted by landscape heterogeneity, especially in cities which are among the world's most heterogeneous landscapes. Nonetheless, current global land cover maps, which are used as a basis for large-scale spatial ecological modeling, represent urban areas as a single, homogeneous, class. This often requires urban ecologists to rely on geographic resources from local governments, which are not comparable between cities and are not available in underserved countries, limiting the spatial scale at which urban conservation issues can be tackled. The recent expansion of community-based geographic databases, for example, OpenStreetMap (OSM), represents an opportunity for ecologists to generate large-scale maps geared toward their specific research needs. However, computational differences in language and format, and the high diversity of information within, limit the access to these data. We provide a framework, using R, to extract geographic features from the OSM database, classify, and integrate them into global land cover maps. The framework includes an exhaustive list of OSM features describing urban and peri-urban landscapes and is validated by quantifying the completeness of the OSM features characterized, and the accuracy of its final output in 34 cities in North America. We portray its application as the basis for generating landscape variables for ecological analysis by using the OSM-enhanced map to generate an urbanization index, and subsequently analyze the spatial occupancy of six mammals throughout Chicago, Illinois, USA. The OSM features characterized had high completeness values for impervious land cover classes (50%-100%). The final output, the OSM-enhance map, provided an 89% accurate representation of the landscape at 30m resolution. The OSM-derived urbanization index outperformed other global spatial data layers in the spatial occupancy analysis and concurred with previously seen local response trends, whereby lagomorphs and squirrels responded positively to urbanization, while skunks, raccoons, opossums, and deer responded negatively. This study provides a roadmap for ecologists to leverage the fine resolution of open-source geographic databases and apply it to spatial modeling by generating research-specific landscape variables. As our occupancy results show, using context-specific maps can improve modeling outputs and reduce uncertainty, especially when trying to understand anthropogenic impacts on wildlife populations.

Human-derived food shrinks home ranges and alters resource selection of mammals at the urban-wild interface

Protected lands are an important source of food, shelter, and reproductive opportunities for wildlife, especially in urban landscapes. When urban development abuts the edges of undisturbed ecosystems, synanthropic species can alter their foraging behaviors and movement to utilize human-supplemented resources throughout the urban-wild interface. Therefore, urban development on the edges of protected lands can have pronounced effects on animal movement and ecosystem functions. Iconic urban adaptive mesopredators such as northern raccoons (Procyon lotor) and Virginia opossums (Didelphis virginiana) often benefit from human-supplemented food sources such as unsecured garbage, pet food, and fresh water when available. To investigate how urban edges affect the movements of urban-adapted omnivores within conservation lands, we estimated home ranges and third-order resource selection of 27 raccoons and 12 opossums with GPS collars throughout the protected areas of northern Key Largo, FL, USA between April 2022–October 2023. The proportion of urban development in an individual's home range was the most influential factor associated with home range size, followed by species and sex. Individuals with greater proportions of residential neighborhoods and commercial areas in their home ranges exhibited smaller home ranges. Third-order resource selection functions identified both mesopredator species using residential and commercial land use areas more than they were available on the landscape. These results indicate that urban areas attract urban-adapted mesopredators from protected areas and result in smaller home ranges in the face of abundant human-derived food. Reduced home ranges on edges can support higher densities of animals, which may increase rates of disease transmission, especially when the urban borders support populations of feral domestic species. Shifting foraging behaviors from the protected areas to urban edges could have cascading downward effects if seed-dispersing roles are diluted. As urbanization increases and the distance between wild lands and human disturbance decreases, it is increasingly important to study the mechanisms of how urban development on the edges of protected areas affect the movement of wildlife.

Comment on Functional landscape connectivity for a select few: Linkages do not consistently predict wildlife movement or occupancy. Autumn R. Iverson, David Waetjen, Fraser Shilling

Ecological connectivity is increasingly acknowledged as crucial for biodiversity conservation. Iverson et al. suggest that increasing stewardship to ensure permeability is a better approach than protecting linkages between protected areas. We argue that the optimal approach depends on the landscape context, conservation goals, and species involved and suggest that linkage plans can prioritize specific places for protection and improved management. However, when using connectivity models as predictive tools, model validation is vital. We commend Iverson et al. for assessing whether modeled linkages were important predictors of species presence. We disagree, though, with the authors’ conclusion that their findings challenge the theory and practice of modeling linkages and explain that the reason may be the misalignment of the validation assumptions with model objectives. We offer our perspective on best practices for conducting validation studies and note factors to consider with respect to data used for model validation and model expectations.

The Meadoway: native meadow creation in underutilized transmission line corridors

Across Ontario, Canada, there are over 30 000 km of transmission line corridors. With proper planning and ongoing maintenance and monitoring, these corridors have the potential to be transformed into native meadow, offering vital pathways connecting natural heritage systems and supporting wildlife movement, while promoting biodiversity, natural functions, and ecosystem health. In 2019, seeding trials were established in the Gatineau Hydro Corridor in east Toronto where a long-term meadow creation project (The Meadoway) is ongoing, to evaluate the effectiveness of herbicide treatment (glyphosate), sowing method, and sowing season on seeding success with the goal of informing site-specific meadow creation techniques. Seed mixes included a variety of native grasses and forbs and were dominated by copper savannah grass ( Sorghastrum nutans), big bluestem ( Andropogon gerardii), little bluestem ( Schizachyrium scoparium), and switch grass ( Panicum virgatum). Overall, fall or winter seeding with herbicide led to the highest seeding success. There was no difference in the effectiveness of hand seeding or using the seed drill. The results of this work provide valuable insights into effective seeding techniques to improve seeding success and also highlight the benefits of in situ experimentation to inform meadow creation techniques.

Identifying priority corridors and bottlenecks for three threatened large mammal species in the oil palm-dominated landscape of Peninsular Malaysia

Agricultural landscape expansion and land development have disrupted wildlife habitats and movement pathways, limiting species’ access to critical resources. Identifying multispecies corridors across human-dominated landscapes is crucial to facilitate safe and unobstructed movement while minimizing negative interactions between humans and wildlife. We conducted a spatial distribution analysis to delineate potential high conflict areas and assess connectivity for the movement of focal species across Peninsular Malaysia. Using conflict data for the Asian elephant (Elephas maximus), Malayan sun bear (Helarctos malayanus), and Malayan tiger (Panthera tigris) spanning an eight-year period (2013–2020), we predicted conflict risk distribution with MaxEnt. We then overlaid the resulting risk maps onto a unified resistance surface and predicted least-cost corridors between high conservation value (HCV) patches. We ranked these corridors by their ecological importance in a plantation landscape. We identified pinch point areas (bottlenecks) to denote locations most critical to species movement along the corridors. Our results suggested that potential high conflict areas were primarily located in eastern and southern Peninsular Malaysia. We identified 89 HCV core patches that were interconnected by 126 linkages. The mean length of the least-cost corridors was 13.41 km. Among the top 10 linkages ranked by centrality value, three crossed commercial plantations for <30 % of their length, and three were highly bottlenecked. This study underscores an ecological approach that considers human–wildlife conflict and habitat connectivity analysis for effective land use planning and critical zone designation.

Inclusion of road ecology criteria within environmental Impact assessment

Transport infrastructure construction and its future expansion is a worldwide phenomenon. Within road ecology, scientific attention has focused on effectiveness of mitigation measures for reducing human-wildlife conflict, essentially an ex-post evaluation approach. This work applies a different conceptual framework: an ex-ante approach paying attention to underlying causes of sub-optimal mitigation, typically found in decision-making procedures. The purpose of the study was to determine whether the emphasis on road ecology mitigation measures changed over time. This study considers 52 road projects in the Czech Republic for which the EIA process was initiated between 2003 and 2022. The survey found a low number of EIA processes where these types of mitigation measures were proposed, although over time the frequency increased mainly at the stage of biological survey. Number of processes where landscape permeability for wildlife movement was assessed also increased over time. Coordinating solutions for human-wildlife conflicts across stages and including road ecology criteria in decision-making processes is essential.

Combining multi-species connectivity modelling with expert knowledge to inform the green infrastructure design

The Canton of Geneva is currently working on defining and mapping its green infrastructure (GI), in order to implement its biodiversity protection directives by 2030. Ecological connectivity is considered in the definition of the GI, as it is a key factor in managing the species extinction risk. It is considered a vital aspect of the landscape, because it can indicate how landscape facilitates or influences wildlife movement. In order to assess connectivity, animal movement data is essential as it provides precise behavioral information on the movements of organisms. Unfortunately, this kind of data is often missing or available only at local scales. Ecologists therefore must deal with a lack of data when trying to supply useful spatially explicit ecological models for conservation planning. To help managers in their efforts to define the GI, an alternative is to rely on local expert knowledge. We have thus applied a structured analytical framework to parameterize an ecological connectivity model combining expert opinion with three of the most used methods to assess ecological connectivity: graph theory, circuit theory and cumulative costs algorithm. By considering a selection of focal species representative of the different ecological requirements and movement behaviour of the regional wildlife, maps of priority areas for the promotion of ecological connectivity were obtained for red deer, roe deer, brown hare and common toad. We estimated the principal cross-border corridors at the scale of the Greater Geneva region, between France and Switzerland. Three transboundary high priority areas were highlighted in our maps. The localization of these areas is principally characterized by natural habitats such as forests, grasslands and freshwater ecosystems, but depends also on the agricultural areas. The principal natural barrier to animal movement is Lake Geneva, and the principal human barriers to movement are human settlements and highways that impede the regional displacements for all of the species. Considering the highways, the barrier effect could be diminished thanks to the recent construction of wildlife overpasses. We have seen that a close collaboration between local experts and ecological modelers is necessary when interpreting the conservation value of land potentially capable of promoting wildlife ecological connectivity. When implementing the GI, it will be useful to combine our models with field campaigns to measure the real functionality of the estimated priority areas, in order to guarantee the success of conservation actions.

Recreation specialization: Resource selection functions as a predictive tool for protected area recreation management

Widespread and ongoing increases in park and protected area (PPA) visitation presents managers with the imminent challenge of preserving ecological conditions while also maintaining accessibility in the open spaces that are fundamental to the health and wellness needs of society. In the field of recreation resource management, recreation specialization, the selective channeling of interests and abilities into a specific recreational activity, has contributed to a more comprehensive understanding of recreation behavior, site preference, management perceptions and conservation support. Contributing to historical understandings of specialization can inform recreation planning on the diversity of uses occurring in urban-proximate PPAs. In this study, survey and GPS data collected in urban and peri-urban parks in the Nature Reserve of Orange County, CA, USA, were used to classify recreationists into three specialization types based on empirically derived dimensions of involvement, commitment and skill. For each survey participant, thirteen spatio-temporal metrics (STM) were calculated. A principle component analysis (PCA) reduced STMs into 3 factors representing expressions of spatial behavior and a one-way analysis of variance indicated unique patterns between specialization types and time spent recreating, elevation gained, speed traveled and stopping behavior. Additionally, GPS point data were analyzed with an analytical approach adopted from the field of wildlife movement ecology; a resource selection function (RSF). The RSF assisted in quantifying spatial distribution patterns specific to each specialization type across activity types at four park locations and demonstrated a landscape-based statistical analysis of probability of use in relation to change in elevation, distance to starting points and park amenities. Committed hikers and mountain bikers largely demonstrated longer trip durations, more elevation gain, less overall stopping, faster overall speeds and farther total distances, while e-bikers in this study demonstrated unintuitive specialization dynamics; casual specialization types travelling farther from starting points and dispersing more across trail systems. Further spatial results revealed spatial behavior to be inherently complex and influenced by numerous confounding factors (i.e. activity type/bike type, starting points, park topography and trail design). This novel spatial examination of recreation specialization according to activity type and park location, is useful in understanding recreation behavior and park use in a spatial context. This ability is helpful in a predictive managerial context when reviewed in correspondence with historical evidence identifying behaviors with increased potential for ecological impact.

Albatrosses employ orientation and routing strategies similar to yacht racers

The way goal-oriented birds adjust their travel direction and route in response to wind significantly affects their travel costs. This is expected to be particularly pronounced in pelagic seabirds, which utilize a wind-dependent flight style called dynamic soaring. Dynamic soaring seabirds in situations without a definite goal, e.g. searching for prey, are known to preferentially fly with crosswinds or quartering-tailwinds to increase the speed and search area, and reduce travel costs. However, little is known about their reaction to wind when heading to a definite goal, such as homing. Homing tracks of wandering albatrosses (Diomedea exulans) vary from beelines to zigzags, which are similar to those of sailboats. Here, given that both albatrosses and sailboats travel slower in headwinds and tailwinds, we tested whether the time-minimizing strategies used by yacht racers can be compared to the locomotion patterns of wandering albatrosses. We predicted that when the goal is located upwind or downwind, albatrosses should deviate their travel directions from the goal on the mesoscale and increase the number of turns on the macroscale. Both hypotheses were supported by track data from albatrosses and racing yachts in the Southern Ocean confirming that albatrosses qualitatively employ the same strategy as yacht racers. Nevertheless, albatrosses did not strictly minimize their travel time, likely making their flight robust against wind fluctuations to reduce flight costs. Our study provides empirical evidence of tacking in albatrosses and demonstrates that man-made movement strategies provide a new perspective on the laws underlying wildlife movement.

Social-ecological predictors of spotted hyena navigation through a shared landscape.

Human-wildlife interactions are increasing in severity due to climate change and proliferating urbanization. Regions where human infrastructure and activity are rapidly densifying or newly appearing constitute novel environments in which wildlife must learn to coexist with people, thereby serving as ideal case studies with which to infer future human-wildlife interactions in shared landscapes. As a widely reviled and behaviorally plastic apex predator, the spotted hyena (Crocuta crocuta) is a model species for understanding how large carnivores navigate these human-caused 'landscapes of fear' in a changing world. Using high-resolution GPS collar data, we applied resource selection functions and step selection functions to assess spotted hyena landscape navigation and fine-scale movement decisions in relation to social-ecological features in a rapidly developing region comprising two protected areas: Lake Nakuru National Park and Soysambu Conservancy, Kenya. We then used camera trap imagery and Barrier Behavior Analysis (BaBA) to further examine hyena interactions with barriers. Our results show that environmental factors, linear infrastructure, human-carnivore conflict hotspots, and human tolerance were all important predictors for landscape-scale resource selection by hyenas, while human experience elements were less important for fine-scale hyena movement decisions. Hyena selection for these characteristics also changed seasonally and across land management types. Camera traps documented an exceptionally high number of individual spotted hyenas (234) approaching the national park fence at 16 sites during the study period, and BaBA results suggested that hyenas perceive protected area boundaries' semi-permeable electric fences as risky but may cross them out of necessity. Our findings highlight that the ability of carnivores to flexibly respond within human-caused landscapes of fear may be expressed differently depending on context, scale, and climatic factors. These results also point to the need to incorporate societal factors into multiscale analyses of wildlife movement to effectively plan for human-wildlife coexistence.

Riparian habitat connectivity restoration in an anthropized landscape: A multi-species approach based on landscape graph and soil bioengineering structures.

In urbanized areas, rivers and riparian ecosystems are often the only ecological corridors available for wildlife movement. There, riverbanks are often stabilised by civil engineering structures (dykes, riprap). This can lead to habitat degradation and loss of landscape connectivity. Fascines (willow bundles tied together) could be an alternative to riprap, since they maintain the quality of the natural ecosystems by using native vegetal species instead of rocks, but their potential positive impact needs to be assessed. We proposed a landscape-scale decision-making method for river managers who want to restore banks by transforming riprap into fascines to improve landscape connectivity. We applied our methodology to a case study involving a 25 km-stretch of the Arve River, France. We selected four target vertebrate species based on biological traits to cover a wide range of dispersal capacities. For each species, we used landscape graphs to assess habitat connectivity under different contrasted riverbank scenarios. Scenarios included replacing all-natural banks with ripraps or replacing all ripraps with fascines. In addition, we systematically tested the effect of replacing individual 100 or 500 m sections of ripraps by fascines, to locate where riverbank restoration would maximize connectivity gain. The four species selected responded very differently to the scenarios (up to +14% and +46% change in Probability of Connectivity for common toads and Eurasian beavers, respectively, 0% for common sandpipers and barred grass snakes). The restoration of specific riverbank sections could result in important gains in PC (up to +33% for one single section for one species) but no section maximized connectivity gain for all the target species.

Home range in genus Capra: from polygons to Brownian bridges of scabietic and healthy Iberian ibexes (Capra pyrenaica).

Home range and home range overlap can be used to describe use of space and movement of wildlife. During the last years, advancements in technology have greatly improved our understanding of animal movement, especially among large herbivores. Wild ungulate abundance and distribution have increased in temperate areas. Moreover, their diseases-including sarcoptic mange in the Iberian Ibex (Capra pyrenaica)-have become a cause of concern for livestock, public health, and wildlife conservation. In this study, we first reviewed existing literature on the home range of species in the genus Capra. We then analyzed data from 52 GPS-GSM-collared Iberian ibexes, of which 33 were healthy and 19 were affected by sarcoptic mange from 3 different populations in the southeastern Iberian Peninsula to analyze: (1) differences in size and characteristics of home ranges obtained by the 3 most commonly used methodologies-minimum convex polygon, kernel density estimation, and Brownian bridges movement models (BBMMs); and (2) the impact of endemic sarcoptic mange on Iberian Ibex home range. The literature review revealed that available information on spatial behavior of Capra spp. was based only on 3 species, including the Iberian Ibex, estimated through a diversity of methods which made it difficult to compare results. We found positive correlations among the different home range estimation methods in the Iberian Ibex, with BBMMs proving to be the most accurate. This study is the first to use BBMMs for estimating home range in this species, and it revealed a marked seasonal behavior in spatial use, although sarcoptic mange smoothed such seasonal pattern. The seasonal overlaps obtained suggest that core areas of the Iberian Ibex change within wider home range areas, which are ecological parameters relevant to identifying key areas for species management and conservation.

Ecological factors influencing invasive predator survival and movement: insights from a continental-scale study of feral cats in Australia

Feral cats (Felis catus) pose a significant global threat to biodiversity, primarily through predation, disease and competition. A key gap in parameterizing models for improving management decisions for feral cat control relates to factors that drive feral cat survival and movement in the wild. Our study objective was to conduct the first continental-scale analysis of survival rates and displacement distances for feral cats. We collated data on 528 feral cats from telemetry studies in naturally-vegetated landscapes across Australia. Using Cox-proportional hazards models, we investigated the effects of sex, presence of larger predators (dingoes, Canis familiaris and introduced foxes, Vulpes vulpes), presence of introduced prey (rabbits, Oryctolagus cuniculus), body mass, landscape productivity and feral cat density on feral cat survival. We also analysed the effects of sex, body mass and landscape productivity on feral cat displacement using linear mixed model analysis. Feral cat survival was positively associated with presence of dingoes and increasing body mass, whereas there was no clear association between feral cat survival and sex, presence of rabbits, or cat density. Presence of foxes had a strong negative effect on feral cat survival, but the hazard ratio was associated with considerable uncertainty. Net displacement of male feral cats was nearly two times further than that of females, and the proportion of feral cats making long-distance movements was greater in landscapes with low productivity. Increasing body mass of feral cats was positively related to net displacement, with heavier cats moving further. Analysis of metadata from telemetry studies can provide valuable insights into wildlife survival rates and movement behaviour. Our findings will help inform the development of effective management strategies and improve feral cat management for biodiversity conservation.

Human activities influence mule deer use of overpasses across multiple scales

AbstractAnthropogenic linear infrastructures (ALIs), including roads, railways, and canals, provide important resources to humans, but they can affect wildlife through habitat fragmentation and reduced movement through landscapes. To mitigate these effects, overpass crossing structures (i.e., overpasses) can facilitate wildlife movement across ALIs and maintain landscape connectivity. Human activities can potentially influence spatial and temporal patterns in wildlife use of overpasses; however, little information is available about human–wildlife interactions across some types of ALIs. Using remote wildlife cameras, we evaluated human and mule deer (Odocoileus hemionus) use and interactions at 43 overpasses along the Central Arizona Project canal in Arizona, USA, during 2 seasons (warm and cool) from February 2021 to February 2022. Mule deer exhibited spatial avoidance of human activities at overpasses, although the effect varied across seasons and types of human activity. At a broad scale, the presence of recreationists at overpasses did not exclude mule deer from using overpasses to cross the canal; however, human presence reduced mule deer detection probability in the warm season. At a fine scale, mule deer decreased use of overpasses as activity associated with canal personnel (i.e., security and maintenance workers) increased in the cool season. For both seasons, mule deer exhibited greater overlap in daily activity patterns with recreationists compared to canal personnel. Further, mule deer shifted daily activity patterns to be more active earlier in the morning at sites with high amounts of recreational use compared to sites with lower recreational use. Because human activities can influence mule deer crossings at overpasses, managers might consider minimizing human activities at crossing locations to increase wildlife use and promote wildlife movement across canals and other types of ALIs.

Application of Geospatial Technology to Assess Pressures and Threats to Nature Related to Human Activities in Wilpattu National Park

Expanding agricultural land is one of the humanities largest and most considerable environmental impacts. It has transformed habitats and is one of the greatest pressures and threats to biodiversity. By 2020, with an estimated population of 22 million, the per capita arable land is about 0.158 hectares. This indicates heavy pressure on agricultural land use. This agricultural land use causes deforestation. Illegal deforestation results in the destruction of habitat and the restriction of wildlife movements. Apart from the direct destruction of habitats of flora and fauna that provide humans with valuable resources, removing forest cover puts many essential natural functions out of order, which may lead to a range of severe consequences. There have been many attempts at human encroachment at Wilpattu National Park, Sri Lanka, and its Forest Reserves; however, it has never been done at this scale with the awareness of the Government Authorities, who failed to act. The Easter end of the Wilpattu National Park lies between the divisional secretariat of Mahaviachchi, Karuwalagasweva, Nochchiyagama, and Rajanganaya. The buffer zone of 1.6km has been marked from the Wilpattu reserve boundary. This study uses the integrated land use assessment by applying a land use evaluation model that evaluates biophysical and human-related data in eight GN Divisions (Hunuvilagama, Kuda Vilachchiya, Track 13, Matha Kiramam, Palaikuli, Pahalapuliyankulam, Parana Eluwankulam, and Andiyapuliyankulam) in buffer zone in Wilpattu National Park. Environmental impact has been assessed based on image classification and area calculations. According to the analysis done in the human settlement, it indicates encroachment of the restricted zone for human settlement. The area of this buffer zone is approximately 33,147 ha. About 9,190 ha of this buffer zone area has been utilized by humans in various ways. Spatial- temporal data in 2003-2019 satellite image classification identified permanent building/housing units within the 1.6 km restricted zone, which has been increased in marginal villages. Mullikulam and Eluwankulam GN Divisions are the most critical and rapidly encroached areas in the forest village in the Wilpattu National Park. According to the GIS-based maps, cultivation, road construction, and residence are significant factors influencing the major ecosystems in the eastern part of the Wilpattu Park Boundary. Mahavilachchi and Nochchiyagama can be identified as the villages where elephants roam more and the areas where elephant-human conflict occurs regularly. Paddy and hay farming are primarily practiced in the areas close to the Wilpattu reserve zone. Additionally, coconut, banana, mango, and cashew crops are cultivated.&#x0D; &#x0D; Keywords: Wilpattu, Agriculture, Deforestation, Buffer zone, Human