Environmental change disrupts communication and sexual selection in a stickleback population
Environmental change disrupts communication and sexual selection in a stickleback population
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DOI：
10.1890/15-1090.1
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发表时间：
2016-04-01
期刊：
影响因子：
4.8
通讯作者：
Bertell, Elina
中科院分区：
文献类型：
--
作者：
Candolin, Ulrika;Tukiainen, Iina;Bertell, Elina
环境的变化会破坏择偶过程中的交流，改变性选择，从而影响种群动态。然而，人们对这种长期影响知之甚少。我们的实验研究的后果，破坏视觉交流在择偶的数量和生存能力的后代产生的threespine刺鱼人口（Gasterosteus aculeatus）。我们进一步将结果与田间种群动态的长期监测联系起来，以确定在自然条件下是否发生了明显的变化。结果表明，受损的视觉沟通，因为藻类水华降低了可靠性的男性视觉信号作为后代生存的指标，在他们的第一个星期的生活。这放松了性选择，但对后代孵化的数量没有影响，因为大多数雄性在浑浊的水中孵化成功率很高。尽管富营养化和高浊度水平干扰了配偶选择期间的交流，但近几十年来人口一直在增长。大量的后代孵化，结合高变异的少年健身，可能已经转移到以后的生活史阶段的选择，并保持一个可行的人口。再加上性选择成本的降低和人类活动造成的持续生态系统变化，这可能促进了人口增长。这些结果表明生态系统的复杂性，以及在试图了解人类活动对人口的影响时考虑所有影响因素的必要性。
Environmental change that disrupts communication during mate choice and alters sexual selection could influence population dynamics. Yet little is known about such long-term effects. We investigated experimentally the consequences that disrupted visual communication during mate choice has for the quantity and viability of offspring produced in a threespine stickleback population (Gasterosteus aculeatus). We further related the results to long term monitoring of population dynamics in the field to determine if changes are apparent under natural conditions. The results show that impaired visual communication because of algal blooms reduces reliability of male visual signals as indicators of offspring survival during their first weeks of life. This relaxes sexual selection but has no effect on the number of offspring hatching, as most males have a high hatching success in turbid water. Despite eutrophication and high turbidity levels that interfere with communication during mate choice, the population has grown during recent decades. Large numbers of offspring hatching, combined with high variation in juvenile fitness, has probably shifted selection to later life history stages and maintained a viable population. Together with reduced cost of sexual selection and ongoing ecosystem changes caused by human activities, this could have promoted population growth. These results point to the complexity of ecosystems and the necessity to consider all influencing factors when attempting to understand impacts of human activities on populations.