EAPSI: Investigating the Presence of a Female Bateman Gradient in the Japanese surfperch Ditrema Temminckii

EAPSI：调查日本冲浪鲈 Ditrema Temminckii 中是否存在雌性贝特曼梯度

• 批准号: 1714049
• 负责人: Michael Izumiyama
• 金额: $ 0.54万
• 依托单位: Izumiyama Michael S
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-06-01 至 2018-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1714049&HistoricalAwards=false
• 关键词: EAPSI; Investigating; Presence; Female; Bateman

Sexual selection is a major force driving evolution. This project will examine how sexual selection and reproduction vary in the Japanese surfperch, Ditrema temminckii, and compare the variation in number of mates and offspring to other surfperches endemic to the eastern Pacific coast. This project will utilize genetic information to understand the number of mates and fathers in a unique fish that exhibits internal fertilization and gestation to the sub-adult state. The research will be conducted at Osaka City University and Niigata University in collaboration with Dr. Satoshi Awata. This collaboration will provide unique data and new insights into how sexual selection varies between different species which diverged roughly 7 million years ago and have maintained a unique reproductive strategy.This project will measure sexual selection in female Ditrema temminckii by utilizing microsatellites to assign parentage to broods of pregnant female D. temminckii. The correlation between the number of sires and number of offspring (Bateman Gradient) will be determined and compared to other species of surfperch in the family Embiotocidae. In addition, sperm storage has been observed in D.temminckii, which uniquely positions this project to address a common criticism of female Bateman gradient studies: namely, that the number of sires is an underestimate of the actual number of mates. By tracking the number of mates progressively during the reproductive season and comparing to the number of sires detected, this study will be the first of its kind with the power to validate (or reject) the use of sires as an estimate of the number of overall mates. Therefore, this project aims to provide insight into the evolution of female sexual selection within a family of fishes that exhibit a derived reproductive strategy; by doing so, we may also resolve the controversy surrounding the use of sires as a proxy for the number of mates and clear the way for future female Bateman gradient studies in surfperch.This award, under the East Asia and Pacific Summer Institutes program, supports summer research by a U.S. graduate student and is jointly funded by National Science Foundation and the Japan Society for the Promotion of Science.

性选择是推动进化的主要力量。该项目将研究日本冲浪鲈 Ditrema temminckii 的性选择和繁殖如何变化，并将交配和后代数量的变化与东太平洋沿岸特有的其他冲浪鲈进行比较。该项目将利用遗传信息来了解一种独特的鱼类的配偶和父亲的数量，这种鱼类表现出内部受精和妊娠到亚成年状态。该研究将在大阪市立大学和新泻大学与粟田聪博士合作进行。这项合作将提供独特的数据和新的见解，以了解不同物种之间的性选择如何变化，这些物种在大约 700 万年前分化并保持着独特的繁殖策略。该项目将通过利用微卫星为怀孕的雌性 D. temminckii 后代分配亲子关系来测量雌性 Ditrema temminckii 的性选择。将确定父系数量和后代数量之间的相关性（贝特曼梯度），并与 Embiotocidae 科的其他鲈鱼物种进行比较。此外，在 D.temminckii 中观察到精子储存，这使该项目独特地解决了对雌性贝特曼梯度研究的常见批评：即雄性数量低估了实际交配数量。通过在繁殖季节逐步跟踪交配数量并与检测到的公牛数量进行比较，这项研究将是同类研究中第一个能够验证（或拒绝）使用公牛作为总体交配数量估计值的研究。因此，该项目旨在深入了解表现出派生繁殖策略的鱼类家族中雌性性选择的演变；通过这样做，我们还可以解决围绕使用雄性作为配偶数量代理的争议，并为未来雌性贝特曼梯度研究在冲浪鲈中扫清道路。该奖项属于东亚和太平洋夏季研究所计划，支持一名美国研究生的夏季研究，并由美国国家科学基金会和日本科学促进会共同资助。