Effects of a highway and mitigation projects on bobcats in Southern Texas

Cain, Alexis; Tuovila, V.R; Hewitt, David G.; Tewes, Michael E.

doi:10.1016/s0006-3207(03)00023-5

Cited by 129 publications

(89 citation statements)

References 11 publications

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“…Track detection in varying substrates, such as marble dust or sand, is a common method because of its low cost and effort, and odorless condition (Yanes et al 1995), besides its ability to distinguish between most species (e.g., Cain et al 2003;Grilo et al 2008;Mata et al 2005;Ng et al 2004;Rodriguez et al 1996). However, it is difficult to differentiate between age classes (adults vs. juveniles) and counts may be underestimated when footprints do not leave species distinguishable tracks (e.g., wolf vs. dog, cat vs. wildcat).…”

Section: Introductionmentioning

confidence: 99%

Surveying drainage culvert use by carnivores: sampling design and cost–benefit analyzes of track-pads vs. video-surveillance methods

Mateus

Grilo

Santos‐Reis

2010

Environ Monit Assess

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Environmental assessment studies often evaluate the effectiveness of drainage culverts as habitat linkages for species, however, the efficiency of the sampling designs and the survey methods are not known. Our main goal was to estimate the most cost-effective monitoring method for sampling carnivore culvert using track-pads and video-surveillance. We estimated the most efficient (lower costs and high detection success) interval between visits (days) when using trackpads and also determined the advantages of using each method. In 2006, we selected two highways in southern Portugal and sampled 15 culverts over two 10-day sampling periods (spring and summer). Using the track-pad method, 90% of the animal tracks were detected using a 2-day interval between visits. We recorded a higher number of crossings for most species using video-surveillance (n = 129) when compared with the track-pad technique (n = 102); however, the detection ability using the video-surveillance method varied with type of structure and species. More crossings were detected in circular culverts (1 m and 1.5 m diameter) than in box culverts (2 m to 4 m width), likely because video cameras had a reduced vision coverage area. On the other hand, carnivore species with small feet such as the common genet Genetta genetta were detected less often using the trackpad surveying method. The cost-benefit analyzes shows that the track-pad technique is the most appropriate technique, but video-surveillance allows year-round surveys as well as the behavior response analyzes of species using crossing structures.

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Section: Introductionmentioning

confidence: 99%

Surveying drainage culvert use by carnivores: sampling design and cost–benefit analyzes of track-pads vs. video-surveillance methods

Mateus

Grilo

Santos‐Reis

2010

Environ Monit Assess

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“…The direct mortality of larger animals due to vehicle collisions is relatively apparent and wellquantified (Clarke et al 1998;Cain et al 2003;Clevenger et al 2003;Saeki and MacDonald 2004). Roadkill may affect the conservation status of speciesabout 65% of the mortality of the endangered Florida Panther (Puma concolor coryi) is caused by vehicular collisions (Harris and Gallagher 1989).…”

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confidence: 99%

“…Within this context, the great majority of research into road-kill has dealt with larger mammals. This focus is due to several socio-economic factors, including the danger to people associated with collisions with large mammals, their economic importance in hunting, and their high public profile (Cain et al 2003;Clevenger et al 2003). A few studies have also examined factors influencing road-kills of smaller mammals (Garland and Bradley 1984;Clevenger et al 2003;Saeki and Macdonald 2004).…”

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confidence: 99%

Road-kill of Mammals in Nova Scotia

Fudge

Freedman

Crowell³

et al. 2007

Can Field Nat

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We examined road mortality of wild mammals in Nova Scotia using data from (a) five years of province-wide data on wildlife collisions involving larger mammals, and (b) 20 months of observations of smaller mammals along a 160-km route near Halifax. An average of 2079 White-tailed Deer was reported killed annually on highways during 1999 through 2003, along with 14 Moose and 33 Black Bear. Female White-tailed Deer were more likely to be road-killed than males (by a factor of 1.8), yearlings more so than older animals, and there were peaks of mortality in the late spring and late autumn. The road-kill of smaller mammals was highest in the summer and least in the winter, and the most frequent mortalities were of Raccoon (28% of observations), Porcupine (27%), Skunk (17%), Snowshoe Hare (6%), Coyote (4%), and Groundhog (3%). The standardized kill-rate (number/100 km) was highest on a 100-series highway compared to trunk highways or urban streets, but the rate standardized to vehicle density was highest on trunk highways.

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“…2.2), the primary highway in the area. Roads act as (Trombulak and Frissell 2000, Clark et al 2001, Tigas et al 2002, Cain et al 2003.…”

Section: Roadsmentioning

confidence: 99%