Meteorological stressors (e.g., temperature and rain shortage) constrain brood provisioning in some bird species, but the consequences on reproductive success have been rarely quantified. Here we show, in a cooperatively breeding population of carrion crow Corvus corone in Spain, that individual feeding rates decreased significantly with rising air temperatures both in breeders and helpers, while lack of rain was associated with a significant reduction in the effort of the male helpers as compared to the other social categories. Group coordination, measured as the degree of alternation of nest visits by carers, was also negatively affected by rising temperature. Furthermore, we found that the body condition of the nestlings worsened when temperatures were high during the rearing period. Interestingly, the analysis of a long-term data set on crow reproduction showed that nestling body condition steadily deteriorated over the last 26-years. Although many factors may concur in causing population changes, our data suggest a possible causal link between global warming, brood caring behaviour and the decline of carrion crow population in the Mediterranean climatic region of Spain.

中文翻译：

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气象条件对合作繁殖腐肉乌鸦育雏的影响及其对繁殖成功率的影响


气象压力因素（例如温度和降雨不足）限制了某些鸟类的育雏供应，但其对繁殖成功率的影响很少被量化。在这里，我们发现，在西班牙合作繁殖的食腐乌鸦 Corvus corone 种群中，随着饲养者和助手的气温升高，个体摄食率显着下降，而缺乏雨水则与雄性助手的努力显着减少有关与其他社会类别相比。群体协调性（以护理人员轮流访问巢穴的程度来衡量）也受到气温上升的负面影响。此外，我们还发现，在饲养期间，气温较高时，雏鸟的身体状况会恶化。有趣的是，对乌鸦繁殖的长期数据集的分析表明，在过去 26 年里，雏鸟的身体状况不断恶化。尽管许多因素可能共同导致种群变化，但我们的数据表明，全球变暖、育雏行为和西班牙地中海气候区食腐乌鸦种群数量下降之间可能存在因果关系。