Algal-diet Enhances Sexual Ornament, Growth And Reproduction in the Guppy
Algal-diet Enhances Sexual Ornament, Growth And Reproduction in the Guppy
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藻类饮食可增强孔雀鱼的性装饰、生长和繁殖
DOI：
10.1163/1568539041166672
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发表时间：
2004
期刊：
影响因子：
1.3
通讯作者：
Y. Haijima
中科院分区：
文献类型：
--
作者：
K. Karino;Y. Haijima
类胡萝卜素通常会影响雄性的颜色，在一些动物中，基于类胡萝卜素的颜色用于雌性择偶。类胡萝卜素对动物多种生理系统的积极影响也是已知的。因为动物必须从食物中获取类胡萝卜素，所以类胡萝卜素颜色的显著性可能表明雄性对富含类胡萝卜素食物的觅食能力。这是可能的，因此，女性可以获得高觅食能力的好处，因此，健康或活力的后代，通过他们的配偶偏好的男性颜色。为了验证这一预测，我们研究了藻类摄入量（类胡萝卜素的自然资源）对孔雀鱼的影响。与对照组相比，在从食物中获得相同能量的情况下，藻的添加不仅促进了雄性橙子着色，而且促进了两性生长和雌性繁殖。然而，类胡萝卜素的补充没有表现出积极的影响，生长和繁殖，但男性橙子着色变得明显。可以用两种方式来解释藻类和类胡萝卜素补充组之间对生长和繁殖的影响的差异。首先，除了用于类胡萝卜素补充的类胡萝卜素外，藻类中的某些类胡萝卜素对促进生长和繁殖起着重要作用。第二，藻类体内的其他物质（如不易消化的碳水化合物）通过对消化系统的积极作用影响藻类的生长和繁殖。由于藻类摄入量不仅增强男性橙子着色，但也生长和繁殖，女性孔雀鱼可能会获得好处，通过配偶偏好男性具有更明亮的着色，因此，更大的觅食能力的藻类。
Carotenoids often influence male coloration, and the carotenoid-based coloration is used for female mate choice in some animals. The positive influence of carotenoids on a variety of physiological systems in animals is also known. Because animals have to obtain carotenoids from their food, the conspicuousness of carotenoid-based coloration may indicate the male's foraging ability for carotenoid-rich food. It is possible, therefore, that females can obtain benefits of the high-foraging ability and, thus, health or vigor of their offspring through their mate preference for the male coloration. In order to test this prediction, we examined the influence of algae-intake (carotenoid-resource in nature) on guppies. By algae-supplement, not only male orange coloration but also growth of both sexes and female reproduction were enhanced compared with fish in control groups, although they got the same amount of energy from their food. However, carotenoid-supplementation did not show the positive influence on growth and reproduction, though male orange coloration became conspicuous. It is possible to explain the difference of the influence on growth and reproduction between algae- and carotenoid-supplement groups in two ways. First, some kinds of carotenoids within algae other than carotenoids used for carotenoid-supplementation play an important role for enhancement of growth and reproduction. Second, other substances (e.g. non-digestible carbohydrates) within algae influenced growth and reproduction through the positive effect on digestive system. Since algae-intake enhanced not only male orange coloration but also growth and reproduction, female guppies may obtain benefits through mate preference for males having brighter coloration and, hence, greater foraging ability for algae.