The Barbary partridge is one of the four species of Alectoris found in Mediterranean Basin. Its range is restricted to Sardinia, northwestern Africa, Gibraltar, and Canary Islands. It is classified as SPEC3 because its population is declining; nonetheless, its ecology is poorly known. Our aims were to define the habitat factors linked to the species presence, and which affects the breeding density in northeastern Sardinia. Data were collected in the breeding seasons 2012 and 2013 carrying out 376 listening points in 34 study sites representative of the typical landscapes of the island. The habitat selection was assessed by generalized linear model with binomial error distribution following an information theoretic approach. In particular, the environmental variables concerning the land use cover, the landscape configuration, and the topography of the points with the species presence were compared with an equal number of availability points. The densities were estimated by distance sampling, and then, we formulated two multiple linear regressions, one for each year, relating densities with the environmental variables. The analyses showed that the species inhabits shrublands, garrigue, and meadows on slopes faced to east, especially between the sea level and 200 m, avoiding forests and northwestern slopes. In 2012 and 2013, we estimated 22.9 and 5.1 pairs per km², respectively. It is likely that this change in densities is related to a lower singing activity of the males due to the bad weather conditions in the spring 2013.

中文翻译：

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地中海撒丁岛的巴巴里part栖息地选择和密度

巴贝里鹧鸪是四个品种之一石鸡在地中海盆地发现。其范围仅限于撒丁岛，西北非洲，直布罗陀和加那利群岛。它被归类为SPEC3，因为它的人口在减少。然而，其生态学知之甚少。我们的目的是确定与物种存在相关的栖息地因素，这些因素影响撒丁岛东北部的繁殖密度。收集了2012年和2013年繁殖季节的数据，在34个代表该岛典型景观的研究地点进行了376个听点。根据信息理论方法，通过具有二项式误差分布的广义线性模型评估生境选择。特别是有关土地用途覆盖，景观配置，并将具有物种存在的点的地形与相等数量的可用点进行比较。通过距离采样估算密度，然后，我们制定了两个多元线性回归，每年一次，将密度与环境变量相关联。分析表明，该物种居住在面向东的斜坡上的灌木丛，营地和草地上，尤其是在海平面至200 m之间，避免了森林和西北斜坡。在2012年和2013年，我们估计每公里22.9和5.1对 和朝向东部的斜坡上的草地，尤其是在海平面至200 m之间，避免了森林和西北斜坡。在2012年和2013年，我们估计每公里22.9和5.1对 和朝向东部的斜坡上的草地，尤其是在海平面至200 m之间，避免了森林和西北斜坡。在2012年和2013年，我们估计每公里22.9和5.1对^2个。由于2013年春季的恶劣天气，这种密度变化可能与男性唱歌活动降低有关。