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Effects of temperature variability on egg mass and clutch size in Great Tits

机译:温度变化对大胸蛋质量和离合器大小的影响

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Models of climate change generally predict rising mean global temperatures combined with greater variability in some regions. While relationships between mean temperature and several reproductive parameters are well documented, the effect of day-today variation in ambient temperature has received little attention. In our study, temperature variation had no significant effects on clutch size in a wild population of Great Tits (Parus major). In contrast, egg mass tended to be smaller when ambient temperatures during the week prior to laying were more variable. We suggest that variable temperatures may be disadvantageous to an egg-laying bird. Thermal variability should therefore be considered as a discrete factor, distinct from mean temperature, when assessing the consequences of climate changes for breeding birds.
机译:气候变化模型通常会预测全球平均气温升高,加上某些地区的变率更大。虽然平均温度和几个生殖参数之间的关系已得到很好的证明,但环境温度的日常变化影响却鲜有关注。在我们的研究中,温度变化对野生大山雀(Parus major)的离合大小没有显着影响。相反,当产蛋前一周的环境温度变化较大时,鸡蛋的质量往往较小。我们建议温度变化可能对产卵的鸟类不利。因此,在评估气候变化对繁殖鸟类的影响时,应将热变异性视为与平均温度不同的离散因素。

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