Guerra, I. D. C. L. (2016). Ecologia urbana do gato doméstico Felis silvestris catus na cidade de Barcelona (Doctoral dissertation, Universidade Lusófona de Humanidades e Tecnologias).
Free life cats (Felis silvestris catus) are now common in urban areas and organize themselves in colonies associated with human presence and food availability. In Barcelona, there is a project of trap-neuter-return (TNR) of these cats.
From the 2013 data, a retrospective study, of the transverse observational type, was done of the free life cats and the ones with an owner. There is a direct relationship between the number of cats and the number of colonies (p = 0,004). The number of colonies is associated with the number of people (p = 0,004). Green areas, which can offer environmental resources, are directly related to the number of cats (p = 0,022) and to large colonies (p = 0,006). On the other hand, the area of the road network, which leads to habitat fragmentation, is directly associated with the number of colonies (p = 0,043) and also with small colonies (p = 0,023). Medium-sized colonies have a direct association with green areas (p = 0,035) and number of people (p = 0,026). The district area has a direct association with average-sized (p = 0,008) and large colonies (p = 0,043) as well as the number of cats (p = 0,005).