Mesocarnivore Community Research Articles

Spatiotemporal partitioning between the endangered San Joaquin kit fox and a novel mesocarnivore community in the urban environment as revealed by camera traps

Urbanization has led to the rapid formation of novel biotic communities, which via interspecific interactions, may affect niche partitioning dynamics of native, sensitive species. The endangered San Joaquin kit fox (Vulpes macrotis mutica; hereafter ‘kit fox’) is a small mesocarnivore inhabiting urban areas of the southern Central Valley of California alongside other urban mesocarnivores. These other species may pose challenges for kit foxes due to a potential lack of evolved mechanisms of defense or avoidance. To address this notion, we evaluated evidence of temporal and spatial partitioning between the kit fox and its potential predators and competitors in an urban environment. We predicted that spatial and temporal overlap would be lower between kit foxes and their predators than with their competitors. We used camera traps with scent lures at high school and college campuses across the southern San Joaquin Valley to monitor the visitation patterns of urban mesocarnivores from 2020 to 2022. We used generalized linear mixed models and AIC model selection to evaluate spatial relationships between kit foxes and other mesocarnivores and we used temporal overlap coefficients and peak activity analysis to evaluate temporal overlap. Kit foxes exhibited low spatial overlap (negative association) with Virginia opossums (Didelphis virginiana) and high spatial overlap (positive association) with domestic cats (Felis catus), domestic dogs (Canis lupus familiaris), northern raccoons (Procyon lotor), and striped skunks (Mephitis mephitis). Kit foxes exhibited low to moderate levels of temporal overlap with other species, the least of which occurring with potential predators (i.e., coyotes (C. latrans), domestic dogs). Our findings support the temporal partitioning and partially support the spatial partitioning hypothesis as potential mechanisms to promote coexistence among mesocarnivores in an urban environment.

Do Mesocarnivores Respond to the Seasonality in Management Practices in an Agroforestry Landscape?

In the Mediterranean, we find a mosaic of natural and cultural landscapes, where a variety of forest management practices created intermediate disturbance regimes that potentially increased biodiversity values. Nonetheless, it is essential to understand the species’ long-term response to the dynamic management in agroecosystems, since the species tolerance to disturbance can change throughout the life cycle. Mammalian carnivores can be sensitive to human disturbance and are an essential part of ecosystems due to their regulatory and community structuring effects. We investigated the spatial response of five mesocarnivores species to spatially- and temporally- varying management practices in an agroforestry landscape. More specifically, we assessed the mesocarnivores’ temporal changes in space use by implementing multi-season occupancy models in a Bayesian framework, using seasonal camera-trapping surveys for a 2-year period. All species had a weak response of local extinction to forestry management and livestock grazing pressure. For forest-dwelling species, occupancy was higher where productivity of perennial vegetation was high, while colonization between seasons was positively associated with vegetation cover. For habitat generalist species, we found that occupancy in the wet season increased with the distance to cattle exclusion plots. Most of these plots are pine stands which are subject to forestry interventions during winter. During the 2-year period we found seasonal fluctuations in occupancy for all species, with an overall slight decrease for three mesocarnivore species, while for the two forest-dwelling species there was an increase in occupancy between years. The weak species response to management practices supports the importance of traditional management for upholding a diverse mesocarnivore community in agroforestry systems but could also reflect these species’ ecological plasticity and resilience to disturbance.

Spatial patterns of anticoagulant rodenticides in three species of medium-sized carnivorans in Pennsylvania

Human influences on natural environments are now ubiquitous but manifest in multiple and unique ways depending on local environments and communities. Attempts to control, or mediate, local pests to residences or to agriculture can impart important negative consequences on systems. Secondary exposure to anticoagulant rodenticides (ARs) can cause numerous adverse effects on wild carnivores including death. Few studies have quantified AR prevalence, investigated their pathway of exposure, or associations with specific location types in the northeastern U.S. We hypothesized that ARs would be found in the mesocarnivore community throughout Pennsylvania and have the greatest detection rate in highly urbanized or agricultural landscapes. From 2019 through early 2022, we collected carcasses to obtain liver samples ( n = 265) from three species of carnivores: bobcats ( Lynx rufus (Schreber, 1777)), fishers ( Pekania pennanti (Erxleben, 1777)), and river otters ( Lontra canadensis (Schreber, 1777)). We used generalized linear models to test for differences in AR detection rates among species and spatial scales including the six Pennsylvania Game Commission regions and 23 wildlife management units. We detected ARs in all species (44.2% collectively), but detection rates differed among species. Our study is the first to document ARs within North American river otters.

Habitat modification destabilizes spatial associations and persistence of Neotropical carnivores

Spatial relationships between sympatric species underpin biotic interactions, structure ecological communities, and maintain ecosystem health. However, the resilience of interspecific spatial associations to human habitat modification remains largely unknown, particularly in tropical regions where anthropogenic impacts are often greatest. We applied multi-state multi-species occurrence models to camera trap data across nine tropical landscapes in Colombia to understand how prominent threats to forest ecosystems influence Neotropical carnivore occurrence and interspecific spatial associations, with implications for biotic interactions. We show that carnivore occurrence represents a delicate balance between local environmental conditions and interspecific interactions that can be compromised in areas of extensive habitat modification. The stability of carnivore spatial associations depends on forest cover to mediate antagonistic encounters with apex predators and structurally intact forests to facilitate coexistence between competing mesocarnivores. Notably, we demonstrate that jaguars play an irreplaceable role in spatially structuring mesocarnivore communities, providing novel evidence on their role as keystone species. With increasing global change, conserving both the extent and quality of tropical forests is imperative to support carnivores and preserve the spatial associations that underpin ecosystem stability and resilience.

Increasing homogeneity of Mediterranean landscapes limits the co-occurrence of mesocarnivores in space and time

ContextThe Mediterranean basin is characterized by a heterogeneous landscape historically shaped by human activities. Land abandonment and extensive monocultures, however, have led to increasing homogeneity of Mediterranean habitats. Albeit the effects of habitat heterogeneity on wildlife have been widely studied, the available information on how habitat homogenization impacts the organization of mesocarnivore communities is still scant.ObjectivesWe investigated the relationship of environmental characteristics with occupancy, activity, community organization, and co-occurrence of mesocarnivore species in space and time. We focused on five key species (Vulpes vulpes, Genetta genetta, Meles meles, Herpestes ichneumon, and Martes foina) widely distributed throughout Mediterranean ecosystems.MethodsThe study was conducted in north-central Portugal between June 2019 and June 2020. We used 300 camera trap sampling points coupled with occupancy, activity, and co-occurrence analysis to assess how different environmental characteristics influence mesocarnivores community.ResultsWe found that the occupancy of mesocarnivores is influenced by topography, landscape composition and structure, and human activity. We observed that landscape homogeneity limits the co-occurrence of mesocarnivores. In heterogeneous landscapes we recorded a greater overlap in activity (seven of ten species pairs) and spatial co-occurrence (six of the seven species pairs analyzed) of mesocarnivores species.ConclusionsWe demonstrated the importance of landscape characteristics in the composition of the mesocarnivores community. Our findings support the adoption of management measures able to mitigate the impacts of landscape homogenization. Maximizing the heterogeneity is an important step to benefit the mesocarnivore community in altered Iberian landscapes.

Assessing spatiotemporal patterns of mesocarnivores along an urban‐to‐rural gradient

AbstractRapid increases in human development and activity are affecting the spatial and temporal dynamics of mammalian mesocarnivore communities. We used 40 motion‐sensitive cameras along an urban‐to‐rural gradient, and single‐season occupancy models, to evaluate the habitat use of a local mesocarnivore guild (coyote [Canis latrans], bobcat [Lynx rufus], red fox [Vulpes vulpes], gray fox [Urocyon cinereoargenteus], and raccoon [Procyon lotor]) near Newburgh, New York, USA, during May–September 2021. Additionally, we fit circular kernel density estimations to assess how mesocarnivores may alter their diel and nocturnal activity patterns in response to human development. Red foxes were positively associated with urban areas and were also significantly more active at night in semiurban areas versus rural and urban locations. Coyotes demonstrated some adaptability to urban areas, being generally more nocturnal as urbanization increased but were also more likely to use higher elevation sites and areas with more natural habitat cover. We did not find support for a spatial shield hypothesis, as red foxes and raccoons were often detected in the same semiurban and urban sites as coyotes. Bobcats generally avoided human‐dominated areas, whereas raccoons were ubiquitous throughout the gradient and exhibited similar daily and nocturnal activity levels in all land cover types. Overall, our results document how anthropogenic disturbance may alter mesocarnivore community structure and landscape use, providing information for managing urban carnivore populations and mitigating human–wildlife conflict, particularly at the local scale.

Response of a mesocarnivore community to a new food resource: recognition, exploitation, and interspecific competition

Mammalian carnivores with generalist feeding behaviour should trace and exploit new and predictable food resources quicker and more easily than more specialised species. On the other hand, if the new food resource is spatially and temporally predictable, interference or exploitation competition should arise among members of the carnivore guild, with the expectation that smaller species will not use the food resource or will change their foraging behaviour to avoid conflict with larger species. Here, we studied the response to a new food resource of a mammalian mesocarnivore community in south-western Iberian Peninsula. We installed artificial feeding points supplied with a novel food source and tracked them by camera trapping to investigate whether (1) the new artificial food resource was visited, recognised and exploited by the mesocarnivore guild species; (2) how frequently they used the food; and (3) in case of co-occurrence, if dominant species excluded or reduced the feeding options of subordinates. All target species except the badger recognised and exploited the novel food. More generalist species trended to visit feeding points more frequently and spent more time feeding than less generalist species, even though significant differences were not achieved in all cases. When co-occurring at the same feeding point, the arrival of larger species reduced either the visitation rates, feeding probability or time spent feeding of smaller species. Moreover, some smaller species showed a shift in their normal activity pattern at the feeding points when a larger competitor started to use the food source. Overall, we conclude that active avoidance combined with temporal segregation may help reduce agonistic interactions among competitors for shared resources.

Spatiotemporal interactions of a novel mesocarnivore community in an urban environment before and during SARS-CoV-2 lockdown.

Studying species interactions and niche segregation under human pressure provides important insights into species adaptation, community functioning and ecosystem stability. Due to their high plasticity in behaviour and diet, urban mesocarnivores are ideal species for studying community assembly in novel communities.We analysed the spatial and temporal species interactions of an urban mesocarnivore community composed of the red fox Vulpes vulpes and the marten Martes sp. as native species, the raccoon Procyon lotor as invasive species, and the cat Felis catus as a domestic species in combination with human disturbance modulated by the SARS‐CoV‐2 lockdown effect that happened while the study was conducted.We analysed camera trap data and applied a joint species distribution model to understand not only the environmental variables influencing the detection of mesocarnivores and their use intensity of environmental features but also the species’ co‐occurrences while accounting for environmental variables. We then assessed whether they displayed temporal niche partitioning based on activity analyses, and finally analysed at a smaller temporal scale the time of delay after the detection of another focal species.We found that species were more often detected and displayed a higher use intensity in gardens during the SARS‐CoV‐2 lockdown period, while showing a shorter temporal delay during the same period, meaning a high human‐induced spatiotemporal overlap. All three wild species spatially co‐occurred within the urban area, with a positive response of raccoons to cats in detection and use intensity, whereas foxes showed a negative trend towards cats. When assessing the temporal partitioning, we found that all wild species showed overlapping nocturnal activities. All species displayed temporal segregation based on temporal delay. According to the temporal delay analyses, cats were the species avoided the most by all wild species. To conclude, we found that although the wild species were positively associated in space, the avoidance occurred at a smaller temporal scale, and human pressure in addition led to high spatiotemporal overlap.Our study sheds light to the complex patterns underlying the interactions in a mesocarnivore community both spatially and temporally, and the exacerbated effect of human pressure on community dynamics.

Fine-scale coexistence between Mediterranean mesocarnivores is mediated by spatial, temporal, and trophic resource partitioning.

The partition of the ecological niche can enhance the coexistence of predators due to differences in how they exploit three main resources: food, space, and time, the latter being an axis that often remains unexplored.We studied niche segregation in a Mediterranean mesocarnivore community composed by Vulpes vulpes, Genetta genetta, Meles meles, and Herpestes ichneumon, addressing simultaneously different niche axes: the temporal, trophic, and spatial axes.We assessed temporal segregation between mesopredators and prey and between potential competitors, using camera trap data between 2018 and 2020 in a Mediterranean landscape in Southern Spain. We deployed camera traps in 35 stations in three sites with varying vegetation cover within Doñana National Park. We further examined the spatial overlap in activity centers and trophic preferences between potential competitors using diet information from studies performed in the study area.We found an overall temporal segregation between trophic generalist species, with species showing higher temporal overlap differing in their trophic preferences and/or showing limited spatial overlap. Furthermore, we observed an overall high overlap between the activity patterns of predators and their major prey in the area (the common genet vs. small mammals and the red fox vs. European rabbit).Our study suggests that coexistence of the different species that compose the mesocarnivore assemblage in Mediterranean landscapes can be facilitated by subtle differences along the three main niche axes, with temporal segregation being a most pronounced mechanism. Our findings reinforce the idea that the coexistence mechanisms underlying community structure are multidimensional.

Land use intensification coupled with free‐roaming dogs as potential defaunation drivers of mesocarnivores in agricultural landscapes

Abstract Land use intensification, by which habitat loss, habitat fragmentation and increased land ownership subdivision occurs, represents one of the largest threats to biodiversity. The extent to which land use intensification affects the presence of native mesocarnivores is largely unexplored, with great implications for all working landscapes where agriculture and native wildlife co‐occur. We obtained mesocarnivore detection/non‐detection data from 180 4‐km2 sampling units in agricultural landscapes of southern Chile from January to April 2019. We used these data to (a) investigate the associations of private land ownership subdivision, forest fragmentation and forest loss with the occurrence of mesocarnivores using single‐species occupancy models, (b) assess patterns of mesocarnivore co‐occurrence with free‐roaming domestic mesocarnivores (e.g. cats and dogs) using two‐species occupancy models and (c) determine whether co‐occurrence of native and domestic mesocarnivores led to alterations in species’ temporal activity. Land ownership subdivision, rather than habitat loss or fragmentation, had the greatest impact on native mesocarnivore occurrence, with some influence of domestic dogs. Mesocarnivore community occurrence varied from a native to domestic species composition as private land ownership subdivision increased. Native mesocarnivores altered their behaviour temporally when co‐occurring with domestics. Lastly, the presence of domestic dogs was associated with an absence of native mesocarnivores, which merits further investigation into the contribution of domestic dogs to a defaunation process in agricultural areas. Policy implications. Our evidence supports focusing efforts in three key dimensions to advance biodiversity conservation in agricultural landscapes. First, private land subdivision represents a robust proxy for measuring anthropogenic impacts on mesocarnivores, and we advocate its use to inform agricultural policy to mitigate a potential defaunation process. Second, there is a need to further engage with landowners and evaluate values, motivation, willingness and action to protect remnant native vegetation and slow land use change. And, lastly, improvements to legislation and conservation marketing strategies on responsible pet ownership are critical to ameliorating the negative impacts of dogs on native wildlife species.

Do Roads Alter the Trophic Behavior of the Mesocarnivore Community Living Close to Them?

Roads have impacts on the fauna arising from habitat fragmentation, roadkill and the barrier effect. Furthermore, roads lead species to change their activity with repercussions on predator–prey interactions and trigger indirect effects that are currently unknown. This study analyzes the effect of a motorway on the trophic behavior of the terrestrial carnivore community of its surroundings. Monthly scat sampling was conducted over a year at three distances from a motorway (0–50 m, 500–550 m and 1000–1050 m). We collected 498 scats, these originating from red fox (39.16%), cat (24.50%), stone marten (24.09%) and badger (12.25%). The relative abundance of the trophic resources in them was estimated together with the trophic diversity and niche overlap of the carnivore species. The results showed a distinct effect of distance from the road on trophic behavior of carnivores, as well as differences between species and seasons. The scats nearest the road had 10–20% more biomass of small mammals, equivalent in relative terms to a 21–48% increase in small mammals’ biomass when compared with scats collected further from the road. This finding indicates changes in predator–prey interactions near the road and shows that the human-generated structural and functional changes to ecosystems spread throughout trophic networks.

Mesocarnivore community structuring in the presence of Africa's apex predator.

Apex predator reintroductions have proliferated across southern Africa, yet their ecological effects and proposed umbrella benefits of associated management lack empirical evaluations. Despite a rich theory on top-down ecosystem regulation via mesopredator suppression, a knowledge gap exists relating to the influence of lions (Panthera leo) over Africa's diverse mesocarnivore (less than 20 kg) communities. We investigate how geographical variation in mesocarnivore community richness and occupancy across South African reserves is associated with the presence of lions. An interesting duality emerged: lion reserves held more mesocarnivore-rich communities, yet mesocarnivore occupancy rates and evenness-weighted diversity were lower in the presence of lions. Human population density in the reserve surroundings had a similarly ubiquitous negative effect on mesocarnivore occupancy. The positive association between species richness and lion presence corroborated the umbrella species concept but translated into small differences in community size. Distributional contractions of mesocarnivore species within lion reserves, and potentially corresponding numerical reductions, suggest within-community mesopredator suppression by lions, probably as a result of lethal encounters and responses to a landscape of fear. Our findings offer empirical support for the theoretical understanding of processes underpinning carnivore community assembly and are of conservation relevance under current large-predator orientated management and conservation paradigms.

Spatial segregation between Iberian lynx and other carnivores

Rabbits represent the bulk of its diet as for many other Iberian predators. This study addresses how the presence of the Iberian lynx affects the spatial distribution of the mesocarnivore community at landscape scale in the Sierra de Andújar. We studied mesocarnivore presence by sampling at 230 camera trapping stations, located in areas with and without lynx. We used a x2–test to compare the proportion of stations in which each species of carnivore were recorded in the zones with and without lynx. The proportion of camera trapping stations in which red fox (Vulpes vulpes), Egyptian mongoose (Herpestes ichneumon), beech marten (Martes foina), wildcat (Felis sylvestris) and common genet (Genetta genetta) were detected was significantly lower in the area where lynx were present than in the area where it was absent. No significant differences between the two types of areas were found for badgers (Meles meles). Our results highlight the role of the lynx as apex predators and the benefits that the recovery of Iberian lynx populations would entail in terms of trophic interactions and restored disrupted ecosystems processes.Key words: Intraguild competition, Carnivores, Phototrapping, Apex preda

Mesocarnivore community structure under predator control: Unintended patterns in a conservation context.

Across the Mediterranean, conservation programmes often operate concomitantly with hunting interests within game-lands. Carnivore guilds lie at the interface between contrasting management goals, being simultaneously fundamental components of ecosystems and targets of predator control to reduce predation on game species. Here, we evaluate the composition and spatial structure of a mesocarnivore community in a protected area of Southeast Portugal, with high economic investment in conservation and significant hunting activity. Between June and August 2015, we deployed 77 camera-traps across a ~80 km2 area. We report on interspecific disparities in mesocarnivore occupancy and associated environmental determinants. Contrasting occupancy states suggest an unbalanced community, biased towards the widespread occurrence of the red fox Vulpes vulpes () compared to other species (stone marten Martes foina, European badger Meles meles, Egyptian mongoose Herpestes ichneumon, common genet Genetta genetta, and Eurasian otter Lutra lutra) exhibiting spatially-restricted occupancy patterns (). The feral cat Felis silvestris catus was the exception () and, together with the stone marten, exhibited a positive association with human settlements. These findings are consistent with theoretical predictions on how mesocarnivore communities are shaped by the effects of non-selective predator control, paradoxically favouring species with higher population growth rates and dispersal abilities, such as the red fox. Our results reinforce the need to understand the role of predator control as a community structuring agent with potential unintended effects, while exposing issues hindering such attempts, namely non-selective illegal killing or biased/concealed information on legal control measures.

Improving mesocarnivore detectability with lures in camera-trapping studies

Context Camera trapping is commonly employed for studying carnivores because it provides better data than do other methods, and with lower costs. Increasing the probability of detecting the target species can reduce parameter uncertainty and survey effort required to estimate density and occurrence. Different methods, including attractants and baits, can be used to increase detectability. However, their efficacy has rarely been quantitatively assessed. Aims To quantify the efficacy of scent and bait attractants to increase the detection probability of mesocarnivores by camera trapping. Methods We tested two scent lures, valerian extract (Val) and lynx urine (LU), their combination (Val–LU), and a non-reward bait (i.e. not accessible to the animal), raw chicken, as carnivore attractants in two protected areas of central Spain. We used camera-trapping records under an occupancy-modelling framework to estimate attractant-specific detection probabilities for six mesocarnivore species, and quantified their effects by comparing these estimates with the baseline (i.e. no attractant) detectability. Key results The weekly detection probability of four mesocarnivore species (red fox, Vulpes vulpes, stone marten, Martes foina, common genet, Genetta genetta, and Eurasian badger, Meles meles) significantly increased when Val–LU (between 0.11 ± 0.07 and 0.67 ± 0.05) or chicken (between 0.31 ± 0.02 and 0.77 ± 0.22) were used as attractant, when compared with baseline detectability (between 0.01 ± 0.02 and 0.29 ± 0.05). Although rarely, wildcats (Felis silvestris) were mostly detected with Val–LU. The probability of detecting a species after k sampling occasions (7 days each) where it was present was highly improved with both Val–LU and chicken for all species (e.g. from 0.20 to 0.98 after four sampling occasions with chicken for the stone marten). Both attractants reduced the sampling time required to ascertain that a species was absent to between 42% and 15% of baseline values. Conclusions The tested attractants greatly improved the detectability of most Iberian mesocarnivores. Although chicken was preferable for some species such as stone marten, Val–LU is most efficient for detecting the whole mesocarnivore community, including rare species such as wildcats. Implications Attractant selection in studies using non-invasive detection methods must be supported by quantitative assessment of the detection probability associated to each attractant. Researchers must choose those attractants best fitting target species and study aims.

Effect of competition and landscape characteristics on mesocarnivore cohabitation in badger setts

AbstractMesocarnivores are becoming increasingly influential in ecosystems due to the ongoing loss of large carnivores. However, interactions within mesocarnivore communities remain poorly understood. We studied how competitive coexistence influences cohabitation of badgers (Meles meles) with other European mesocarnivores, and badger habitat selection at sett site and sett environ scales (within a 700 m radius buffer). We used data on the location and use of 234 badger setts in a 39 000 km2 area of mainland Estonia (Northern Europe) to assess the importance of sett occupancy by badgers, the regional abundance of other mesocarnivores (fox/raccoon dog), bedrock complex and landscape in explaining the presence of other mesocarnivores at badger setts. We also compared data from observed setts and random locations to study sett site selection. Setts where foxes or raccoon dogs were present had a lower proportion of active badger entrances and were more likely to be found in forests of agricultural areas, compared with setts where these species were absent. Sett locations tended to occur more frequently in older meso‐ and eutrophic forests on sandy soils. Badgers tended to avoid human infrastructure at sett locations and in the sett environ when selecting sett locations. Our results reveal the influence of habitat fragmentation and competitive relationships on cohabitation between terrestrial carnivores.

Apex predators and the facilitation of resource partitioning among mesopredators

Apex predators may influence carnivore communities through the suppression of competitively dominant mesopredators, however they also provide carrion subsidies that could influence foraging and competition among sympatric mesopredators when small prey is scarce. We assessed coyoteCanis latransand red foxVulpes vulpeswinter diet overlap and composition from scats collected in two study areas with 3‐fold difference in grey wolfCanis lupusdensity due to a wolf control program. We hypothesized that differences in diet composition would be driven by the use of carrion, and tested whether 1) apex predators facilitate resource overlap, or 2) apex predators facilitate resource partitioning. We estimated the available biomass of snowshoe hares and voles based on pellet density and vole capture rates in each study area. We used molecular analysis to confirm species identification of predator scats, and used microscopic evaluation of prey remains to analyze diet composition of 471 coyote and fox scats. Ungulate carrion, voles and snowshoe hares comprised 73% of coyote and fox diet, and differences in use of carrion and microtines accounted for nearly 60% of the dissimilarity in diet among these canids. Carrion was the top‐ranked item in the coyote diet in both study areas, whereas carrion use by red foxes declined 3‐fold in the study area with higher wolf and small prey abundance. Diet overlap tended to be lower and diet diversity tended to be higher where wolves were more abundant, though these trends were not statistically significant. Taken together, our findings indicate that carrion provisions could facilitate resource partitioning in mesocarnivore communities by alleviating exploitation competition for small mammals.

Time partitioning in mesocarnivore communities from different habitats of NW Italy: insights into martens’ competitive abilities

Most studies focused on species coexistence have been directed at the differential use of habitat and food resources; nonetheless, the differential use of the diel cycle may enhance the coexistence of same-sized species. We investigated the activity patterns of mesocarnivores (red fox (Vulpes vulpes), European badger (Meles meles), pine marten (Martes martes), stone marten (M. foina)) in NW Italy via camera-trapping. We hypothesized that the smallest species would tend to avoid competition by selecting time periods when larger species were less active. Foxes, badgers, and stone martens were mainly nocturnal. In lowland areas overlap between coexisting species was generally low, while in Mediterranean habitats all activity patterns tended to be unimodal and overlap was generally high. The pine marten showed a cathemeral pattern. We suggest that the lower ability of the stone marten to avoid interference competition at community-level may play a major role in determining its widespread exclusion from forested areas by the pine marten.

Mediterranean mesocarnivores in spatially structured managed landscapes: community organisation in time and space

In the multi-functional and biodiverse cork oak landscapes of Iberia (Montado), agro-silvo-pastoral practices promote landscape heterogeneity and create intricate habitat and resource availability patterns. We used camera-traps to investigate the temporal and spatial organisation of a mesocarnivore community in a Montado landscape in central Portugal. The target carnivore assemblage was largely dominated by three generalist species – the red fox Vulpes vulpes, the European badger Meles meles and the Egyptian mongoose Herpestes ichneumon – while remaining community members – the common genet Genetta genetta and the feral cat Felis silvestris spp. – exhibited restricted distributions. Interspecific differences in activity rhythms and habitat use were particularly marked among widespread species. Low temporal overlap was reported between the diurnal mongoose and predominantly nocturnal red fox and badger. For the latter two species, contrasting differences in habitat use were associated with anthropogenic-induced environmental heterogeneity. Whereas the red fox used more intensively Montado areas preserving dense shrubby understory and avoided semi-disturbed mosaics of sparse shrubs, the badgers displayed the opposite pattern. Our findings add to previous evidence suggesting that the spatial structure created in highly managed landscapes, particularly the diversity of resulting understory structures, promotes the abundance and spread of generalist mesocarnivore species. These may benefit from the surplus of resource amount (e.g. prey) and the creation of different human-made habitats conditions that provide particular combinations of ecological resources favourable to each species requirements. We concur the common view that maintaining understory heterogeneity in Montado landscapes, menaced by current intensification and extensification trends, is important where carnivore persistence is a relevant conservation goal, but alert for potential effects on carnivore assemblages structuring and impacts for specialist species less tolerant to disturbance.

Optimizing camera‐trapping protocols for characterizing mesocarnivore communities in south‐western Europe

AbstractCarnivores are elusive, nocturnal and scarce, hence, their detection is difficult. Camera trapping has become a powerful non‐invasive technique for collecting information on such elusive species. Some of its major applications are species inventories and community monitoring. Some efforts have been recently devoted to standardize protocols for monitoring mammal communities in tropical areas. Nevertheless, there is a lack of standardization across studies for monitoring carnivore communities in temperate areas. We aimed to optimize camera‐trapping protocols for monitoring mesocarnivore communities in Mediterranean areas, minimizing sampling effort to accurately estimate species richness. For this purpose, we assessed the effect of number of cameras, time they remain active, area covered and spatial arrangement on species richness estimates. We used between 50 and 60 camera‐traps combined with generalist scent attractants in two national parks located in central Spain. We generated random sets of 5–40 cameras and evaluated the accumulated richness between 1 and 30 days since deployment. Generalized linear model analysis indicates that active days, number of cameras, covered area and study area best explained species richness. A minimum of 30 active cameras during 20 days were required for attaining the asymptotical species richness. A larger effort was required to detect all species in the study area with higher species richness (six vs. five species). These results agree with the effort required for obtaining at least one camera image of those species with the lowest detection rates. Scattered deployments required less effort (number of cameras) to reach an asymptote of species richness than clumped layouts, although differences were not significant. These findings can be used as guidelines for monitoring mesocarnivore communities with camera‐traps in temperate areas, although particular monitoring requirements will depend on the community composition and density of mesocarnivore species present in a given study area.