Department of Biology, Section of Ecology, University of Turku, Turku, Finland.
J Evol Biol. 2011 Jan;24(1):196-205. doi: 10.1111/j.1420-9101.2010.02157.x. Epub 2010 Nov 2.
The impact of nutritional deficiencies early in life in determining life-history variation in organisms is well recognized. The negative effects of inbreeding on fitness are also well known. Contrary to studies on vertebrates, studies on invertebrates are not consistent with the observation that inbreeding compromises resistance to parasites and pathogens. In this study, we investigated the effect of early nutrition on the magnitude of inbreeding depression in development time, adult body size and adult resistance to the bacterium Serratia marcescens in Drosophila melanogaster. We found that early nutritional environment had no effect on the magnitude of inbreeding depression in development time or adult body size but may have played a small role in adult resistance to the bacterial infection. Estimates of heritabilities for development time under the poor nutritional environment were larger than those measured under the standard nutritional conditions.
生命早期的营养缺乏对生物生活史变异的影响是众所周知的。近亲繁殖对适应性的负面影响也是众所周知的。与脊椎动物的研究相反，无脊椎动物的研究与这样的观察结果不一致，即近亲繁殖会损害对寄生虫和病原体的抵抗力。在这项研究中，我们研究了早期营养对黑腹果蝇发育时间、成虫体型和成虫对细菌粘质沙雷氏菌抗性的近交衰退程度的影响。我们发现，早期营养环境对发育时间或成虫体型的近交衰退程度没有影响，但可能在成虫对细菌感染的抗性方面发挥了很小的作用。在较差的营养环境下，发育时间的遗传力估计值大于在标准营养条件下测量的值。
