Study on photoperiodic regulation of reproductive seasonality of Guangdong greylag geese.
研究了光照对广东灰鹅季节性繁殖活动和内分泌的调控。
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Indeed, the study by Dr Nettle and Dr Pollet which found that reproductive success correlates with men's income, also points out that with women the correlation is inverted.
The researchers used four different experiments to separate out the influence of male and female factors on reproductive success -- something that is difficult to study in wild animals.