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Dryad

Detection histories of mesocarnivores in agricultural areas of Southern Chile

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Sep 14, 2021 version files 435.45 KB

Abstract

We obtained mesocarnivore detection/non-detection data from 180 sampling units (4 km2 each) located in the agricultural landscapes of southern Chile from January-April of 2019. We used single-species occupancy models to investigate the associations of forest fragmentation, forest loss, and private land ownership subdivision (as a measure of human use intensification) with the occurrence of four mesocarnivores (güiña, grey fox, culpeo fox, and Molina’s hog-nosed skunk), and extended this framework to two-species occupancy models to assess patterns of mesocarnivore co-occurrence with domestic carnivores. We also assessed whether co-occurrence of native and domestic carnivores led to shifts in species’ temporal activity.

We hypothesized that the occurrence of native mesocarnivores was largely mediated by human use intensification variables only, the occurrence of domestic mesocarnivores only, or a combination of both. Our results largely supported the human use intensification hypothesis, with some influence of domestic mesocarnivores. Mesocarnivore occurrence shifted from a native to a domestic species composition as private land ownership subdivision increased, and native mesocarnivores shifted their behaviour temporally when co-occurring with domestics. In addition, the presence of domestic dogs was associated with an absence of native mesocarnivores, possibly driving a defaunation process in agricultural areas.