The release of farm-reared game birds for hunting is an increasingly common game management practice. However, releasing could have negative effects on sympatric wild species, for example, through parasite transmission. Here, we document the spatial-temporal patterns and intensity of red-legged partridge releases in the province of Ciudad Real, Spain, over a 15-year period (2002–2016), relating them to local changes in the abundance of little bustards estimated from two surveys carried out in 2005 and 2016. Within the province, > 600,000 red-legged partridges were released annually over at least 20% of the area. Releasing intensity varied between estates and fluctuated over the 15-year study period, probably because of an economic crisis during 2008–2014. Overall, numbers of little bustards dropped by 46% between surveys, the decrease being more marked in the west of the province. Contrary to expectation, the only hunting estates where little bustards did not decrease were those with higher release intensity. This may be a consequence of management measures or other factors that benefit little bustards and are more prevalent on those estates than elsewhere, such as game crop provision, predator control or habitat quality.

中文翻译：

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濒临灭绝的小bus的种群变化是否与释放红脚part进行狩猎有关？西班牙中部的一项大规模研究

释放农场饲养的猎鸟是一种越来越普遍的游戏管理习惯。但是，释放可能会对同胞野生物种产生负面影响，例如，通过寄生虫传播。在这里，我们记录了15年内（2002-2016年）西班牙雷阿尔城省红脚part释放的时空格局和强度，并将其与当地估计的小bus鸟数量变化联系起来来自2005年和2016年进行的两次调查。在该省内，每年至少有20万以上的地区释放了600,000多只红脚part。房地产的发行强度各不相同，在15年的研究期内波动较大，这可能是由于2008-2014年的经济危机造成的。总体而言，两次调查之间的小bus鸟数量下降了46％，下降在该省西部尤为明显。与预期相反的是，只有少数release鸟没有减少的狩猎场是那些具有较高释放强度的场。这可能是由于管理措施或其他使bus鸟受益不多，且在这些庄园中比其他地方普遍流行的其他因素的结果，例如野味作物的提供，捕食者的控制或栖息地质量。