Roadkills as a Method to Monitor Raccoon Dog Populations

Balčiauskas, Linas; Stratford, Jos; Balčiauskienė, Laima; Kučas, Andrius

doi:10.3390/ani11113147

Cited by 5 publications

(1 citation statement)

References 51 publications

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“…Taxonomic names used in this study followed the current IUCN taxonomy database [30]. For this analysis, the exotic species (European hare and wild boar) were considered in the general medium-large mammals' road-kill assessment due to their relevance in safety issues on Brazilian highways and importance for monitoring invasive species [11,37]. The conservation status of the common tapeti (Sylvilagus brasiliensis) was considered here in accordance with the IUCN classification before 2019.…”

Section: Species Conservation Status and Taxonomic Namesmentioning

confidence: 99%

How Many Mammals Are Killed on Brazilian Roads? Assessing Impacts and Conservation Implications

et al. 2022

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Millions of animals are killed on roads annually due to collisions with vehicles, particularly medium–large mammals. Studies on mammal road-kill flourished in Brazil in the last decade and an assessment of research on road-kill impacts at a country level will help define science-based conservation strategies. In this study, we used the compiled scientific literature to provide the state of knowledge on medium and large-sized mammals killed by road traffic in Brazil, their conservation status, and an approximation of the road-kill magnitude. We reviewed a total of 62 scientific papers that reported road-kill data accounting for 11.817 individuals. Of the 102 species of medium–large mammals found in the IUCN list, more than half (n = 62; 61%) were recorded as road-kill on Brazilian roads. The Carnivora order comprises over a quarter (n = 23; 37%) of the total road-killed species. A total of 9 species (14.5%) were classified as threatened, with a further 10 (16%) as Near Threatened. Over half of the road-killed species (n = 33, 53%) showed declining population trends according to their IUCN conservation status. Our extrapolation of the results for the entire Brazilian paved road network showed that the number of medium–large road-killed mammals can reach almost 9 million yearly (maximum 8.7 million; mean 1.3 million), representing a biomass of more than 10000 tons. The highest roadkill rates were recorded for common generalists and least concern species, although there were also threatened and near threatened species within the top 15 highest road-kill rates. The declining population trends found for most species reflect serious conservation concerns, since there is a lack of information on the mortality effects at population levels. Our results suggest that medium–large mammals are severally affected by road mortality in Brazil. More investigations are needed at local and abundance population levels, in a way that allows the inclusion of road network as an important threat for target species impacted by road-kill in the national territory, in order to develop adequate plans to mitigate those impacts.

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Section: Species Conservation Status and Taxonomic Namesmentioning

confidence: 99%

How Many Mammals Are Killed on Brazilian Roads? Assessing Impacts and Conservation Implications

et al. 2022

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Successful invasion: camera trap distance sampling reveals higher density for invasive raccoon dog compared to native mesopredators

Selonen,

Brommer,

Klangwald

et al. 2024

Biol Invasions

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Monitoring population parameters of invasive species gains importance as these species continue to expand all over the world. Monitoring of invasive mammalian mesopredators is, however, complicated due to their nocturnal and secretive behaviour. In the European Union, the most common invasive mesopredator is the raccoon dog (Nyctereutes procyonoides), which causes concerns for native species, such as endangered waterfowl that may be subject to nest predation. We studied the density of mesopredators in southern Finland with wildlife cameras, using methodology of distance sampling. We deployed in total of 175 camera traps around 11 (spring 2020) and 16 (spring 2021) lakes or wetlands. We inferred densities for raccoon dogs, and for native mesopredators the red fox (Vulpes vulpes) and the European badger (Meles meles) for comparison. Raccoon dogs were found to have higher overall as well as site-specific densities (about 3.7 ind./km2) than badgers (1.2 ind./km2) and red foxes (0.6 ind./km2). The raccoon dogs also were present at every study wetland, while badgers were not found at all sites. The red fox showed more diurnal activity compared to raccoon dogs and badgers. Camera trap distance sampling enabled us to provide a density estimates on a rather small spatial and temporal scale for species of similar size and movement speed. It could therefore prove valuable as a long-term monitoring option, as climate trends are likely to further enable raccoon dog expansion. Currently this invasive species appears to be the most common mesopredator around wetlands in the southern boreal zone of southern Finland.

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Factors Affecting Roadkills of Semi-Aquatic Mammals

Balčiauskas

Stratford

Kučas

et al. 2022

Biology

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We previously showed that registration efforts and traffic intensity explain 90% of variation in mammal roadkill numbers, 70% of variation in the numbers of recorded species and 40% of diversity variation. Here we analyze semiaquatic mammal roadkill in Lithuania in 2002–2021, relating these to the monitoring effort. From 39,936 analyzed roadkill, the European beaver (Castor fiber) was registered 60 times, American mink (Neovison vison) 26 times, otter (Lutra lutra) 22 times and muskrat (Ondatra zibethica) 3 times. The average roadkill indexes were 0.000065, 0.00076, 0.00061 and 0.00010 ind./km/day, and the extrapolated annual roadkill for the country was 44–357, 36–456, 49–464 and 89–144 individuals, respectively. Beaver roadkill numbers correlated with the registration effort and traffic intensity, otter roadkill with registration effort only and mink with hunting bag (number of hunted individuals per year). Roadkill was not always related to proximity to water, with 38–54% of roadkill occurring over 200 m from the nearest water source. With American mink and muskrat being invasive species in the EU and otter protected in many countries, it is valuable to enhance the registrations of their roadkill (using targeted efforts by drivers, hunters or other citizen scientists) to obtain the extrapolated amount of roadkill and to use this knowledge in species management.

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Roadkills as a Method to Monitor Raccoon Dog Populations

Cited by 5 publications

References 51 publications

How Many Mammals Are Killed on Brazilian Roads? Assessing Impacts and Conservation Implications

How Many Mammals Are Killed on Brazilian Roads? Assessing Impacts and Conservation Implications

Successful invasion: camera trap distance sampling reveals higher density for invasive raccoon dog compared to native mesopredators

Factors Affecting Roadkills of Semi-Aquatic Mammals

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