Do the numbers and locations of road-killed anuran carcasses accurately reflect impacts of vehicular traffic?

Beckmann, Christa; Shine, Richard

doi:10.1002/jwmg.806

Cited by 28 publications

(10 citation statements)

References 53 publications

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“…This is similar to findings for other species of opportunistic feeding habits, such as black kite, red kite, booted eagle, and common buzzard, which, in some cases, feed on dead animals (Planillo et al, 2015). These predatory opportunistic species can prey 73 % of the animals run over in a few hours (Beckmann and Shine, 2015). Black kite, red kite and common buzzard can become accustomed to travelling and exploiting roads as a source of food (Blanco and Viñuela, 2004;Planillo et al, 2015).…”

Section: Involved Speciessupporting

confidence: 79%

“…Conducting a sampling of wildlife collisions in large areas such as Aragon is a difficult task due to multiple factors, such as detectability (detection of roadkills and injured birds) and carcass persistence times (removal of carcasses by scavenger species or disappearance by multiple vehicle run over) (Bishop and Brogan, 2013;Beckmann and Shine, 2015;Santos et al, 2015;Vidal-Vallés and Pérez-Collazos, 2016). La Alfranca WRC database has relevant data missing due to: (i) lack of game species records, (ii) bias related to areas with a lower/greater presence of Nature Protection Agents, (iii) data deletion of non-informative records (i.e.…”

Section: Methodological Aspectsmentioning

confidence: 99%

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Bird roadkill occurences in Aragon, Spain

Vidal-Vallés¹,

Rodríguez²,

Pérez‐Collazos³

et al. 2018

Anim. Biodiv. Conserv.

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Bird roadkill occurences in Aragon, Spain. The increase in road networks and vehicular traffic has posed a major threat to vertebrates over the last century. Although it is difficult to determine the annual number of avian-vehicle collisions, 2 to 9 million roadkills have been estimated for Europe, with numbers varying from country to country. Few studies have been conducted at a national or regional level in Spain. In this study we used data from La Alfranca Wildlife Rehabilitation Centre database to determine location, season and incidence of avian-vehicle collisions in the autonomous county of Aragon (Spain). A total of 643 wild birds representing 71 species were killed on roads between 2012 and 2014. Nine of these species have a high incidence of avian-vehicle collisions, four a moderate incidence, and 57 a low incidence. The species with the highest incidence was the griffon vulture (120 individuals). Spatial distribution of avian-vehicle collisions was heterogeneous, and the incidence was highest in July, August and September. We identified 41 reas of high roadkill occurrence, using a number of roadkills per km index (RI): 28 in the province of Zaragoza, nine in Huesca and four in Teruel. Management strategies are proposed to reduce this threat on wild birds.

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Section: Involved Speciessupporting

confidence: 79%

Section: Methodological Aspectsmentioning

confidence: 99%

Bird roadkill occurences in Aragon, Spain

Vidal-Vallés¹,

Rodríguez²,

Pérez‐Collazos³

et al. 2018

Anim. Biodiv. Conserv.

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show abstract

“…Another study determined that variations in carcass persistence could also bias survey results, as persistence was much lower in small animals and easily influenced weather conditions [129]. Other studies flagged up survey interval [130], scavenger removal [131] and species detectability [132,133] as factors that would influence survey results. Such biased surveys are particularly concerning if mortality estimates are used to determine the impact of roads and road networks on a species, and particularly when species of concern are involved.…”

Section: Survey Design and Mitigationmentioning

confidence: 99%

Effects of Road Density and Pattern on the Conservation of Species and Biodiversity

Bennett

2017

Curr Landscape Ecol Rep

137

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The development and presence of roads can reduce landscape permeability, lead to habitat loss, and increase habitat fragmentation. It is these fundamental changes in landscape structure that can have both direct and indirect impacts on the conservation of species and biodiversity. In this review, I examine 215 research studies conducted between 2011 and 2015 that explore the impacts of roads and road networks on a wide range of species. I divided these studies into four main categories: 1) the direct effects of roads on wildlife, 2) the indirect effects of roads on wildlife, 3) the consequences of road networks on wildlife populations, and 4) survey design and mitigation including both innovations and evaluations. I found that the majority of studies (38%) explored the indirect effects of roads on wildlife, including displacement, fitness consequences, and road crossing ability of wildlife. Nevertheless, despite there being a pressing need to understand how existing road networks impact wildlife and how increasing road density may influence local and regional population persistence, only 10% of the studies considered the implications of road networks on wildlife. However, there is an increasing trend towards the development of predictive models that can be used for a better understanding of road network impacts, assess landscape connectivity, and devise mitigation. This review also highlighted the continued need to devise and evaluate mitigation measures so transportation authorities and conservation practitioners may be better equipped to address the ecological implications of roads and proposed road development.

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“…obs.). Species that linger on the road surface are more likely to be seen and counted in the survey grids (Beckmann and Shine 2015).…”

Section: Temporal Changes In Native Frog Numbersmentioning

confidence: 99%

Frogs in the spotlight: a 16‐year survey of native frogs and invasive toads on a floodplain in tropical Australia

Brown

Shine

2016

Ecology and Evolution

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Although widespread declines in anuran populations have attracted considerable concern, the stochastic demographics of these animals make it difficult to detect consistent trends against a background of spatial and temporal variation. To identify long‐term trends, we need datasets gathered over long time periods, especially from tropical areas where anuran biodiversity is highest. We conducted road surveys of four anurans in the Australian wet–dry tropics on 4637 nights over a 16‐year period. Our surveys spanned the arrival of invasive cane toads (Rhinella marina), allowing us to assess the invader's impact on native anuran populations. Our counts demonstrate abrupt and asynchronous shifts in abundance and species composition from one year to the next, not clearly linked to rainfall patterns. Typically, periods of decline in numbers of a species were limited to 1–2 years and were followed by 1‐ to 2‐year periods of increase. No taxa showed consistent declines over time, although trajectories for some species showed significant perturbations coincident with the arrival of toads. None of the four focal frog species was less common at the end of the study than at the beginning, and three of the species reached peak abundances after toad arrival. Survey counts of cane toads increased rapidly during the initial stage of invasion but have subsequently declined and fluctuated. Distinguishing consistent declines versus stochastic fluctuations in anuran populations requires extensive time‐series analysis, coupled with an understanding of the shifts expected under local climatic conditions. This is especially pertinent when assessing impacts of specific perturbations such as invasive species.

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Do the numbers and locations of road-killed anuran carcasses accurately reflect impacts of vehicular traffic?

Cited by 28 publications

References 53 publications

Bird roadkill occurences in Aragon, Spain

Bird roadkill occurences in Aragon, Spain

Effects of Road Density and Pattern on the Conservation of Species and Biodiversity

Frogs in the spotlight: a 16‐year survey of native frogs and invasive toads on a floodplain in tropical Australia

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