Predictable adaptive trajectories of sexual coloration in the wild: Evidence from replicate experimental guppy populations*
Predictable adaptive trajectories of sexual coloration in the wild: Evidence from replicate experimental guppy populations*
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DOI：
10.1111/evo.13564
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发表时间：
2018-11-01
期刊：
影响因子：
3.3
通讯作者：
Reznick, David N.
中科院分区：
文献类型：
--
作者：
Kemp, Darrell J.;Batistic, Frana-Katica;Reznick, David N.
种群是否在相似的选择机制下可预测地、持续地进化，是理解野外适应过程的基础。我们用一个重复的进化实验来解决这个问题，实验集中在孔雀鱼（Poecilia reticulata）的雄性性着色上。鱼从瓜纳波河的一个单一的高捕食种群移植到四个重复的，没有孔雀鱼的低捕食源溪流。两条溪流的树冠变薄，以调整显示和感知男性颜色的环境。我们使用易位后4至6年取样的第二代实验室繁殖的鱼的后代来评估进化分歧。先前在邻近的排水系统中进行的相同设计的实验导致了更广泛的橙色，黑色和彩虹色标记的演变。然而，我们发现只有结构颜色（彩虹蓝色/绿色）扩张的证据，橙色没有变化，黑色减少。这种反应放大了早先对瓜纳波鱼的发现，揭示了不同流域的颜色加工轨迹不同。我们还发现，在冠层较薄的位置，颜色表型的进化更大。我们的研究结果支持了野生性特征进化的可预测性，并强调了信号条件和观赏起点在形成适应轨迹中的重要性。
The question of whether populations evolve predictably and consistently under similar selective regimes is fundamental to understanding how adaptation proceeds in the wild. We address this question with a replicated evolution experiment focused upon male sexual coloration in guppies (Poecilia reticulata). Fish were transplanted from a single high predation population in the Guanapo River to four replicate, guppy-free low predation headwater streams. Two streams had their canopies thinned to adjust the setting under which male coloration is displayed and perceived. We assessed evolutionary divergence using second-generation lab-bred offspring of fish sampled four to six years following translocation. A prior experiment of the same design, performed in an adjacent drainage, resulted in the evolution of more extensive orange, black, and iridescent markings. We however found evidence for expansion only in structural coloration (iridescent blue/green), no change in orange, and a reduction in black. This response amplifies earlier findings for Guanapo fish, revealing that trajectories of color elaboration differ among drainages. We also found that color phenotypes evolved more greatly at the thinned-canopy sites. Our findings support the predictability of sexual trait evolution in the wild, and underscore the importance of signaling conditions and ornamental starting points in shaping adaptive trajectories.