Study of reproductive ecology and sociality of Lake Tanganyika cichlids : a model system of social evolution of vertebrates

坦噶尼喀湖慈鲷的生殖生态学和社会性研究：脊椎动物社会进化的模型系统

基本信息

批准号：
14405008
负责人：
KOHDA Masanori
金额：
$ 8.19万
依托单位：
Osaka City University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

In this year, Kohda and Takeyarna as a cooperator studied in Lake Tanganyika. Kohda researched breeding ecology of cooperatively polyandrous cichlid Chalinochramis brichardi, especially on the spawning sites in wedge-shaped nests. He found further examples where egg clutches were deposited at the point in the nest to which large alpha males can reach. These were similar to depositing sites observed in previous years. These results may indicate female selectively spawn eggs at the site to which large alpha males can reach, and may lead the hypothesis that through selection of spawning sites by females of this fish, they may control paternity distribution in this fish.In laboratory experiments at the Mpulungu City, female choice of nest shape, wedge-shaped nests and wide nests was examined. AS predidted from field observation in previous years, female tended to choose wedge-shaped nests in which female can control paternity distribution. From field observation of C.brichardi, we obtained … More further examples of egg clutches. Of 11 egg olutches 10 were deposited at the site in nest to which a large alpha male can enter. We made a hypothesis that females can control paternity distribution by selecting such sita as spawning site. Female control of paternity distribution in cooperative breeding vertebrates has been suggested, The test of this hypothesis will be the first example of female control of paternity distribution in extra-fertilizing animals.N.savoryi is known as a haremic cichlid. We found that this fish has helpers, probably related. Cooperative breeding with related helpers has been reported in birds as well as cichlids, but both in birds and cichlids breeding members are of pairs. Thus ; the cooperative breeding of N.savoryi will the first example in haremio mating system. We will examine the relatedness between adults and helpers using samples. We brought ca. 40 individuals of N.savoryi to the laboratory of Osaka City University. Using these live fish, we will conduct aquarium experiment on the cooperative breeding of this fish, Less

今年，Kohda 和 Takeyarna 作为合作伙伴在坦噶尼喀湖研究了合作性多雄丽鱼 Chalinochramis brichardi 的繁殖生态，特别是在楔形巢穴的产卵地点，他发现了更多的卵窝沉积的例子。这些结果与前几年观察到的沉积地点相似，表明雌性会选择性地在大型雄性雄性的栖息地产卵。可以达到并可能导致这样的假设：通过这种鱼的雌性对产卵地点的选择，它们可以控制这种鱼的亲子分布。在姆普隆古市的实验室实验中，雌性对巢形状、楔形巢和宽巢的选择根据多年来的实地观察，雌性倾向于选择楔形巢，其中雌性可以控制亲子分布。通过对 C.brichardi 的实地观察，我们获得了 11 个卵的更多例子。 olutches 10 沉积在大型雄性阿尔法可以进入的位置，我们假设雌性可以通过选择这样的位置作为产卵地点来控制亲子分布。这一假设的检验将是雌性控制额外受精动物中亲子分布的第一个例子。N.savoryi 被称为 haremic cichlid 我们发现这种鱼有助手，与相关辅助者的合作繁殖在鸟类和慈鲷中都有报道，但鸟类和慈鲷的繁殖成员都是成对的，因此，N.savoryi 的合作繁殖将是 Haremio 交配系统中的第一个例子。我们将大约 40 条 N.savoryi 带到大阪市立大学的实验室，利用这些活鱼进行水族箱实验。这种鱼合作养殖，少