Food supplements increase adult tarsus length, but not growth rate, in an island population of house sparrows (Passer domesticus).
Food supplements increase adult tarsus length, but not growth rate, in an island population of house sparrows (Passer domesticus).
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DOI：
10.1186/1756-0500-4-431
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发表时间：
2011-10-21
影响因子：
1.8
通讯作者：
Nakagawa S
中科院分区：
文献类型：
--
作者：
Cleasby IR;Burke T;Schroeder J;Nakagawa S
在发育早期，食物供应的变化会影响许多物种的生长速度和体型。然而，虽然食物限制的有害影响经常在自然人口中进行研究，但很少有人研究年轻个体如何应对人为增加的食物供应。在这里，我们调查了在生长和发育的关键时期给家雀雏鸟提供食物补充剂的短期和长期影响，并评估了提供食物补充剂是否对成年麻雀的大小有任何持续的影响(在这里测量的是眼睑长度)。雄性雏鸟往往比雌性雏鸟达到更高的质量渐近线。此外，雏鸟大小与雏鸟的渐近质量呈负相关。然而，提供食物补充剂对雏鸡的生长速度或渐近质量没有影响。在幼鸟时期接受食物补充剂的成鸟，在脚踝长度方面，比没有在雏鸟时期接受额外食物的成虫更大。此外，在成年雄鸟中，以雏鸟的身份服用食物补充剂的成年雄鸟的眼睑长度的变化明显小于没有服用食物补充剂的雄鸟的差异。我们的结果表明，雏鸡在关键发育期所经历的食物供应可能会对它们的成体表型产生永久性的影响。此外，给雏鸟提供额外的食物会导致成年大小相关性状的性别偏向差异，这表明在生长过程中所经历的环境可能会影响性别大小二型的程度。
Variation in food supply during early development can influence growth rate and body size in many species. However, whilst the detrimental effects of food restriction have often been studied in natural populations, how young individuals respond to an artificial increase in food supply is rarely investigated. Here, we investigated both the short-term and long-term effects of providing house sparrow chicks with food supplements during a key period of growth and development and assessed whether providing food supplements had any persistent effect upon adult size (measured here as tarsus length). Male nestlings tended to reach higher mass asymptotes than females. Furthermore, brood size was negatively associated with a chick's asymptotic mass. However, providing food supplements had no influence upon the growth rate or the asymptotic mass of chicks. Adults that received food supplements as chicks were larger, in terms of their tarsus length, than adults that did not receive extra food as chicks. In addition, the variation in tarsus length amongst adult males that were given food supplements as chicks was significantly less than the variance observed amongst males that did not receive food supplements. Our results demonstrate that the food supply chicks experience during a critical developmental period can have a permanent effect upon their adult phenotype. Furthermore, providing extra food to chicks resulted in sex-biased variance in a size-related trait amongst adults, which shows that the degree of sexual size dimorphism can be affected by the environment experienced during growth.