Reproductive rates, operational sex ratios and mate choice in St Peter's fish
Reproductive rates, operational sex ratios and mate choice in St Peter's fish
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DOI：
10.1007/s002650050272
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发表时间：
1996-08-01
影响因子：
2.3
通讯作者：
BalshineEarn, S
中科院分区：
文献类型：
--
作者：
BalshineEarn, S
操作性性别比(OSR)理论预测，潜在生育率(PRR)的性别差异会在OSR中产生偏见，从而决定性别选择(竞争和选择)的相对强度。尽管这一理论被广泛接受，但量化它的实证研究仍然缺乏。本文就是对这一问题的研究。我在霍尔德(Kinneret湖)测量了加利利圣彼得鱼(Sartherodon Galilaeus)的天然OSR，并在实验室中检验了择偶的方向。Kinneret湖的OSR是男性偏见的。偏向男性的性别比例和较高的男性繁殖率(速度是女性的两倍)都导致了OSR的倾斜，但PRR的性别差异被证明是导致OSR差异的主要因素。雌性，PRR越低的性别，对配偶的选择越多。更快的雄性繁殖率可能解释了为什么雌性在质量上变化较小但对配偶更有选择性。
Operational sex ratio (OSR) theory predicts that sexual differences in potential reproductive rates (PRRs) create biases in the OSR and thus determine the relative strength of sexual selection (competition and choice) operating on each sex. Although this theory is well accepted, empirical studies that quantify it are still lacking. This paper presents such a study. I measured the natural OSR of Galilee St. Peter's fish (Sarotherodon galilaeus) in the held (Lake Kinneret) and examined the direction of mate choice in the laboratory. The OSR in Lake Kinneret was male biased. Both a male-biased sex ratio and higher male reproductive rates (twice as fast as females) contributed to the skew in the OSR, but the sexual differences in PRR were shown to be the main factor causing variation in the OSR. Females, the sex with the lower PRR, were more selective for mates. The faster male reproductive rate may explain why females are more selective for mates despite varying less in quality.