Les hommes ont oublié cette vérité. Mais tu ne dois pas l'oublier, dit le renard. Tu deviens responsable pour toujours de ce que tu as apprivoisé.
Le Petit Prince, chap. 21

Saturday 8 October 2016

nteractions between domestic and wild carnivores around the greater Serengeti ecosystem

Craft, M. E., Vial, F., Miguel, E., Cleaveland, S., Ferdinands, A., & Packer, C. (2016). Interactions between domestic and wild carnivores around the greater Serengeti ecosystem. Animal Conservation.

The domestic and wild carnivore interface is complex, yet understudied. Interactions between carnivore species have important implications for direct interference competition, cross-species transmission of shared pathogens and conservation threats to wild carnivores. However, carnivore intraguild interactions are hard to quantify. In this study, we asked 512 villagers residing around a conservation area in the Serengeti Ecosystem, Tanzania, to report on the presence of wild carnivores in their village, the number of domestic dogs Canis familiaris and cats Felis catus in their household and interactions between domestic and wild carnivores. Wild carnivores are abundant near households surrounding the Serengeti National Park, villagers have many free-ranging domestic dogs (and would like to have more) and direct and indirect contacts between wild and domestic carnivores are common. Large carnivores, such as spotted hyenas and leopards, often killed or wounded domestic dogs. Small carnivores, such as mongoose, bat-eared fox, serval and wildcat, are locally abundant and frequently interact with domestic dogs. We demonstrate that interspecific carnivore behavior, human culture and local and regional geography play a complex role in domestic and wild carnivore interaction risk around conservation areas. Through the use of household surveys, we were able to efficiently obtain data on a wide scope of carnivore interactions over a large area, which may provide a direction for future targeted and in-depth research to reduce interspecific conflict. Improving the health and husbandry of domestic animals and reducing the unintentional feeding of wild carnivores could reduce dog–wildlife interactions and the potential for pathogen transmission at the domestic–wild animal interface.

Saturday 1 October 2016

Confinement remains the simplest measure to reduce roaming by pet cats

Hall, C. M., Bryant, K. A., Haskard, K., Major, T., Bruce, S., & Calver, M. C. (2016). Factors determining the home ranges of pet cats: A meta-analysis. Biological Conservation, 203, 313-320.

• We assessed pet cats' roaming behaviour using meta-analyses and mixed linear models.
• Desexing, regular feeding and interaction with owners did not affect home range.
• Males had larger home ranges than females.
• Both sexes had larger home ranges at low housing densities.
• Confinement remains the simplest measure to reduce roaming by pet cats.

Roaming pet cats Felis catus are a significant conservation issue because they may hunt, harass and compete with wildlife; spread disease, interbreed with cats in feral populations, and hybridise with wild native felids. Studies of the roaming behaviour of pet cats are often hampered by modest sample sizes and variability between cats, limiting statistical significance of the findings and their usefulness in recommending measures to discourage roaming. We resolved these difficulties through meta-analyses of 25 studies from 10 countries involving 469 pet cats to assess the influence of sex, whether a cat was desexed and housing density on roaming. A complementary linear mixed models approach used data on 311 individual animals from 22 studies and was also able to assess the influence of age and husbandry practices on roaming. This restricted sample gave greater statistical power than the meta-analyses.

Meta-analyses found that: male pet cats had larger home ranges than females, desexing did not influence home range, and cats had larger home ranges when housing densities were low. The linear mixed models supported those results. They also indicated that animals ≥ 8 years old had smaller home ranges than younger cats. Cats fed regularly, provided with veterinary care and socialised with humans had similar home ranges to cats living in association with households but not provided for in some of these ways. Short of confinement, there is no simple measure owners can adopt to reduce roaming by their cats and prevent the associated environmental problems.
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