A sensory bias has triggered the evolution of egg-spots in cichlid fishes.
A sensory bias has triggered the evolution of egg-spots in cichlid fishes.
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DOI：
10.1371/journal.pone.0025601
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发表时间：
2011
期刊：
影响因子：
3.7
通讯作者：
Salzburger W
中科院分区：
文献类型：
--
作者：
Egger B;Klaefiger Y;Theis A;Salzburger W
虽然，一般来说，性别限制性状的起源仍然难以捉摸，感官开发假说提供了一个解释男性性信号的进化。臀鳍卵斑是雄性的性信号，也是种类最丰富的慈鲷科鱼类--单色鱼的一个关键特征。大约1500种口孵物种的雄性在求偶时利用这些显眼的假卵--显然是为了吸引雌性并最大限度地提高受精成功率。在这里，我们测试的假设，即单染卵斑的演变是由预先存在的偏见鸡蛋或鸡蛋样着色。为此，我们进行了择偶实验的基础haplochromine伪肾隆头鱼，这体现了近形特征状态的蛋点，无臀鳍。使用计算机动画的男性照片进行的实验确实表明，女性更喜欢带有虚拟（“硅”）卵点的男性图像，而不是显示未改变男性的图像。此外，我们测试的颜色偏好（外的交配上下文）在一个具有代表性的东非慈鲷。我们发现，在所有测试的单倍染色体中，以及重要的是，在代表更多基线的大多数其他物种中，都强烈偏好黄色、橙子或红色斑点。这种预先存在的女性感官偏见指向高质量（富含类胡萝卜素）的食物，这表明它是适应性的。
Although, generally, the origin of sex-limited traits remains elusive, the sensory exploitation hypothesis provides an explanation for the evolution of male sexual signals. Anal fin egg-spots are such a male sexual signal and a key characteristic of the most species-rich group of cichlid fishes, the haplochromines. Males of about 1500 mouth-brooding species utilize these conspicuous egg-dummies during courtship – apparently to attract females and to maximize fertilization success. Here we test the hypothesis that the evolution of haplochromine egg-spots was triggered by a pre-existing bias for eggs or egg-like coloration. To this end, we performed mate-choice experiments in the basal haplochromine Pseudocrenilabrus multicolor, which manifests the plesiomorphic character-state of an egg-spot-less anal fin. Experiments using computer-animated photographs of males indeed revealed that females prefer images of males with virtual (‘in-silico’) egg-spots over images showing unaltered males. In addition, we tested for color preferences (outside a mating context) in a phylogenetically representative set of East African cichlids. We uncovered a strong preference for yellow, orange or reddish spots in all haplochromines tested and, importantly, also in most other species representing more basal lines. This pre-existing female sensory bias points towards high-quality (carotenoids-enriched) food suggesting that it is adaptive.
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影响因子：
5.4
作者：
Salzburger W;Braasch I;Meyer A
通讯作者：
Meyer A
影响因子：
3.4
作者：
Salzburger W;Mack T;Verheyen E;Meyer A
通讯作者：
Meyer A
影响因子：
2.4
作者：
Baldauf, Sebastian A.;Bakker, Theo C. M.;Thuenken, Timo
通讯作者：
Thuenken, Timo
影响因子：
64.8
作者：
MILINSKI, M;BAKKER, TCM
通讯作者：
BAKKER, TCM
影响因子：
2
作者：
Baldauf, S. A.;Kullmann, H.;Bakker, T. C. M.
通讯作者：
Bakker, T. C. M.