Parental investment in relation to offspring quality in the biparental cichlid fish Pelvicachromis taeniatus
Parental investment in relation to offspring quality in the biparental cichlid fish Pelvicachromis taeniatus
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双亲丽鱼科鱼 Pelvicachromis taeniatus 亲本投资与后代质量的关系
DOI：
10.1016/j.anbehav.2010.04.001
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发表时间：
2010
期刊：
影响因子：
2.5
通讯作者：
H. Kullmann
中科院分区：
文献类型：
--
作者：
T. Thünken;D. Meuthen;T. Bakker;H. Kullmann
理论预测，父母应该根据幼崽的生育价值调整他们的父母投资。以前的研究主要调查了雏鸟大小、孵化年限和照顾强度之间的关系。然而，后代的平均体型等孵化质量特征对父母投资的影响相对较少受到关注。我们研究了双亲育儿的柔鱼Pelvicachromis taeniatus的亲代对孵化质量的反应。我们通过控制自由游泳鱼苗的食物可获得性来控制后代的质量，并在4周内测量了父母的反应。总体而言，在这4周内，照顾减少了，这表明父母调整照顾以减少后代的脆弱性。然而，相对低质量幼仔的父母，即个体平均体型相对较小的幼仔的父母，在照顾方面比高质量幼仔的父母减少得更多，导致在第四周提供的照顾显著不同。结果表明，父母根据育儿质量调整照顾方式，支持父母投资理论的预测。此外，高质量鱼苗的母亲明显比低质量鱼苗的母亲对伴侣更具攻击性。这一结果是在父母对育种值的反应的背景下讨论的。一般来说，雌性比雄性在育儿上投入更多。
Theory predicts that parents should adjust their parental investment to the reproductive value of the brood. Previous studies have mainly investigated the relationship between brood size, brood age and the intensity of care. However, the impact of brood quality traits such as the offspring’s average body size on parental investment has received relatively little attention. We examined the parental response to brood quality in the biparentally brood-caring cichlid fish Pelvicachromis taeniatus. We manipulated offspring quality by manipulating the food availability for the free-swimming fry and measured the parental response over 4 weeks. Generally, care decreased over the 4 weeks suggesting that parents adjust care to decreasing offspring vulnerability. However, parents of relatively low-quality broods, that is, of broods with relatively small average individual body size, showed a greater reduction in care than parents of high-quality broods resulting in a significant difference in care provided in the fourth week. The result suggests that parents adjust their care to brood quality and supports the predictions of the parental investment theory. Furthermore, mothers of high-quality fry were significantly more aggressive towards their partner than mothers of low-quality fry. This result is discussed in the context of parental response to brood value. Generally, females invested more in brood care than males.