The influence of proximity with riparian forests and the distance from urban areas on roadkills of vertebrates in a fragmented Brazilian savanna area

Abstract

The increasing development of highways severely threatens several vertebrates due to habitat fragmentation, edge effects and roadkills. Understanding how the landscape influences the occurrence of roadkills on highways can provide insights into the preferred routes of fauna dispersion and define the priority stretches to implement mitigation actions. This study evaluated the association between landscape characteristics and fauna roadkills on the BR‐158 highway (State of Mato Grosso do Sul, Brazil), where the adjacent vegetation encompasses phytophysiognomies of the Cerrado, a severely threatened biome. The spatial distribution of recorded road‐killed vertebrates (secondary data) was analysed using the statistical tool 2D Hotspot Identification, which defined the stretches with the highest mortality (hotspots). The surrounding landscape within a 1 km buffer zone around the highway was characterized based on area and distance information considering the land use and cover. Generalized linear models were applied to test the influence of locations on roadkill, considering the landscape characteristics as independent variables and the presence/absence of roadkill as the dependent variable. Our results indicated two hotspot stretches along the BR‐158 highway and a higher probability of roadkill in stretches associated with riparian forests and more distant from urban areas. The identification of landscape characteristics associated with the occurrence of vertebrate roadkills can help guide the planning and monitoring of highways. Furthermore, in dry ecosystems such as the Cerrado, we must provide information to implement priority actions in stretches of riparian forest, aiming to mitigate the adverse effects of highways on local biodiversity conservation.

Ecology in South America: Present state and future prospects

“…This work serves as a compelling illustration of the valuable insights that can be gained through trait-based approaches on vegetation responses to changing climatic conditions, ultimately providing a mechanistic guidance for managing and conserving plant species in the face of climate change. Martins et al (2024aMartins et al ( , 2024b examined the association between vertebrates' roadkill and land cover and land use in a fragmented Brazilian savanna area. The researchers analysed roadkill data obtained from weekly surveys conducted over a two-year period on a road located in the centre-western region of Brazil.…”

“…Martins et al. (2024a, 2024b) examined the association between vertebrates' roadkill and land cover and land use in a fragmented Brazilian savanna area. The researchers analysed roadkill data obtained from weekly surveys conducted over a two‐year period on a road located in the centre‐western region of Brazil.…”