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http://china.sciencemag.org/
[Science]繁殖力更强的雄性动物生更多的雄性后代
研究显示，在野外有蹄动物后代的性别比通常取决于雌性的条件，条件好的雌性生的雄性比雌性多。确定雄性是否也影响性别比要困难得多。Montserrat Gomendio和同事检验了雄性繁殖力对性别比的影响。他们把从自然种群中采集的精子人工受精给家养的雌性。这些雌性都很健康，也都有充足的饲料，以尽量减小雌性对性别比变化的影响。研究人员发现，从精子质量的估计，繁殖力更高的雄性生殖更多的雄性后代，而繁殖力相对低的雄性生殖更多的雌性后代。这些发现为我们对了解野生种群中的性别比的进化提供了一个新视角。
报告：Male Fertility and Sex Ratio at Birth in Red Deer, Montserrat Gomendio, et al.
Science 1 December 2006:
Vol. 314. no. 5804, p. 1417
DOI: 10.1126/science.1130168
Male Fertility and Sex Ratio at Birth in Red Deer
Montserrat Gomendio,1* Aurelio F. Malo,1 Ana J. Soler,2 Maria R. Fernández-Santos,2 Milagros C. Esteso,2 Andrés J. García,2 Eduardo R. S. Roldan,1* Julian Garde2
Efforts to test sex ratio theory have focused mostly on females. However, when males possess traits that could enhance the reproductive success of sons, males would also benefit from the manipulation of the offspring sex ratio. We tested the prediction that more-fertile red deer males produce more sons. Our findings reveal that male fertility is positively related to the proportion of male offspring. We also show that there is a positive correlation between the percentage of morphologically normal spermatozoa (a main determinant of male fertility) and the proportion of male offspring. Thus, males may contribute significantly to biases in sex ratio at birth among mammals, creating the potential for conflicts of interest between males and females.
1 Reproductive Ecology and Biology Group, Department of Evolutionary Ecology, Museo Nacional de Ciencias Naturales [Consejo Superior de Investigaciones Científicas (CSIC)], 28006-Madrid, Spain.
2 Instituto de Investigación en Recursos Cinegéticos [CSIC-Universidad de Castilla-La Mancha–Junta de Communidades de Castilla-La Mancha (JCCM)], 02071-Albacete, Spain.
These authors contributed equally to this work.
* To whom correspondence should be addressed. E-mail: montseg@mncn.csic.es (M.G.); roldane@mncn.csic.es (E.R.S.R.)
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