Abstract
Road mortality is an increasing problem for terrestrial vertebrate conservation due to the increase of both road numbers and vehicle flow. We hypothesize that the probability of a predator being killed on the road is related to the presence of its prey adjacent to the road, which is likely to be related to the use that these predators make of road verges. We aim to identify the features of specific stretches of road where road-kills of a predator (European polecat) occur in Mediterranean landscapes, including the presence of its main prey (European rabbit) and landscape and road features. We compared 85 100 m long stretches of road where at least one road-kill was recorded with 104 stretches without any road-kill in a dry agricultural landscape in central Spain. We used regression analysis to investigate the relationship between road-kill occurrence and the features in the 67% of the cases. Road-kill stretches were characterised by greater numbers of rabbit burrows in the road verges and by higher traffic flow and speed (i.e. higher speed limit, lower proportion of heavy vehicles, wider road and lower proportion of unbroken central lines). Road-kill stretches also had more metres built over bridges and lower densities of people. We validated our best model with a dataset (the 33% of the cases) not included in its development, which correctly classified 82% of road-kill stretches and 89% of non-road kill stretches. Our results highlight the need for taking into account food resource distribution when studying causes of animal road-kills.
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Abbreviations
- AIC:
-
Akaike information criterion
- AICc:
-
Corrected Akaike information criterion
- IGN:
-
The Spanish national geographic institute
- PC:
-
Principal component
- PCA:
-
Principal component analysis
- UTM:
-
Universal transverse mercator coordinate system
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Acknowledgements
We are very grateful to I. Cardiel, R. Jiménez, P.M. García, D. Martínez, O. Frías, J.A. Calvo, J.A. Lemus for their help in the field. We thank F. Valera, R. Václav, E. Virgós, J. Moya-Laraño, G. Hernández-Milián, J. Birks, D.P. Sleeman and an anonymous referee for their helpful suggestions. J. Moya-Laraño, Mark T. Bulling and B. Nicholls checked the English. Traffic data were provided by M. Vidal (Junta de Comunidades de Castilla-La Mancha), A. J. Cervantes and J. Cobas (Diputación de Toledo) and A. Oliver (TELVENT). The Dirección General del Medio Natural of Toledo Province (Junta de Comunidades de Castilla-La Mancha) partially supported our research by means of TO-01-03 and TO-01-04.
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Appendix 1
Appendix 1
The results of the principal component analysis run prior to the development of the models in order to investigate the multicollinearity among independent variables
Variable | PC1 | PC2 | PC3 | PC4 | PC5 | PC6 |
---|---|---|---|---|---|---|
DRY | 0.421258 | −0.132407 | 0.230408 | −0.839526 | −0.030065 | −0.007502 |
NON_CULT | 0.219066 | 0.230037 | −0.097520 | 0.809347 | 0.067512 | 0.218732 |
OTHER | −0.820769 | −0.107831 | −0.182926 | 0.110852 | −0.043183 | −0.257860 |
WOODY | 0.077028 | 0.633344 | 0.101267 | 0.369508 | 0.224009 | −0.143506 |
M_BURROW | −0.242736 | 0.066876 | 0.115347 | −0.127656 | −0.071437 | −0.805967 |
N_BURROWS | 0.147825 | 0.027444 | −0.132319 | 0.182981 | 0.218188 | 0.786171 |
TOWN | 0.263878 | −0.006824 | 0.377190 | 0.529965 | −0.054079 | 0.212921 |
HOUSE | 0.230201 | −0.354476 | 0.494688 | 0.072375 | 0.239758 | 0.215083 |
RIVER | 0.126340 | −0.286418 | 0.083116 | 0.025225 | 0.384410 | −0.539122 |
SPEED | 0.854368 | 0.029600 | −0.110758 | 0.169153 | 0.018011 | 0.078418 |
TRAFFIC | −0.161921 | 0.115909 | −0.762606 | 0.150385 | 0.265780 | 0.115479 |
HEAVY | −0.085134 | 0.117805 | 0.647747 | 0.082747 | −0.053125 | −0.223346 |
WIDTH | 0.431084 | −0.088140 | −0.617466 | 0.248435 | −0.061471 | 0.129852 |
PASS | 0.008378 | −0.750472 | 0.007064 | −0.033088 | 0.118274 | −0.143836 |
EMBANKMENT | 0.126225 | 0.086953 | −0.269614 | −0.031974 | 0.783474 | 0.109793 |
BRIDGE | 0.043028 | 0.775742 | −0.042387 | 0.075463 | 0.153974 | 0.017040 |
UNBROK_LINE | −0.443517 | 0.143221 | 0.132539 | 0.129783 | 0.563282 | 0.069696 |
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Barrientos, R., Bolonio, L. The presence of rabbits adjacent to roads increases polecat road mortality. Biodivers Conserv 18, 405–418 (2009). https://doi.org/10.1007/s10531-008-9499-9
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DOI: https://doi.org/10.1007/s10531-008-9499-9