進行適應性雜交的雌性蟾蜍更喜歡高質量的異種交配
作者:
小柯機器人發布時間:2020/3/23 14:12:23
美國北卡羅萊納大學Karin S. Pfennig和Catherine Chen研究組合作報告,進行適應性雜交的雌性蟾蜍更喜歡高質量的異種交配。這一成果於2020年3月20日發表在《科學》。
通常認為雜交(種間雜交)是隨機發生在兩個物種的成員之間。與預期相反,雌性平原蟾蜍(Spea bombifrons)可以通過優先與另一物種雄性墨西哥蟾蜍(Spea multiplicata)的優質雄性交配,以此來提高其進化適應性。
墨西哥雄性蟾蜍的交配方面可以預測他們的雜交後代的健康狀況,由於這些特性,平原雌性蟾蜍更偏向墨西哥雄性蟾蜍,但僅在雜交適應性強的種群和生態條件下發生。
通過選擇另一物種適應性增強的伴侶,雌性會增加雜交的益處,並在整個物種之間進行性選擇。物種之間的非隨機交配因此可以增加物種間適應性基因流動的可能性,因此適應性基因滲入不是簡單的偶然事件。
附:英文原文
Title: Female toads engaging in adaptive hybridization prefer high-quality heterospecifics as mates
Author: Catherine Chen, Karin S. Pfennig
Issue&Volume: 2020/03/20
Abstract: Abstract
Hybridization—interbreeding between species—is generally thought to occur randomly between members of two species. Contrary to expectation, female plains spadefoot toads (Spea bombifrons) can increase their evolutionary fitness by preferentially mating with high-quality males of another species, the Mexican spadefoot toad (Spea multiplicata). Aspects of Mexican spadefoot males』 mating calls predict their hybrid offspring’s fitness, and plains spadefoot females prefer Mexican spadefoot males on the basis of these attributes, but only in populations and ecological conditions where hybridization is adaptive. By selecting fitness-enhancing mates of another species, females increase hybridization’s benefits and exert sexual selection across species. Nonrandom mating between species can thereby increase the potential for adaptive gene flow between species so that adaptive introgression is not simply happenstance.
DOI: 10.1126/science.aaz5109
Source: https://science.sciencemag.org/content/367/6484/1377
Science:《科學》,創刊於1880年。隸屬於美國科學促進會,最新IF:41.037