Multiple factors determine the use and effectiveness of wildlife passagesand crossings installed in new roads as mitigation measures against the barrier effect. It is unknown whether factors such as seasonality determinethe use of these structures. This analyses the seasonality of structure used by vertebrates. Forty-eight transverse structures crossing the A-52 motorway in north-western Spain are studied during the summer and winter of 2002û03. The use of structures by terrestrial vertebrates was monitored bytracks left in marble dust and photographic systems, and comparisons carried out by means of generalized lineal methods for count data. Structural factors mostly determined the differential use of passage types by speciesbut seasonal changes were detected both in the intensity of use and in passage selection by some species. (A) Reprinted with permission from Elsevier.
Abstract