Brain differences in ecologically differentiated sticklebacks.
Brain differences in ecologically differentiated sticklebacks.
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DOI：
10.1093/cz/zox074
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发表时间：
2018-04
期刊：
影响因子：
2.2
通讯作者：
Handling editor: Rudiger Riesch
中科院分区：
文献类型：
--
作者：
Keagy J;Braithwaite VA;Boughman JW;Handling editor: Rudiger Riesch
最近发生分化的种群为研究进化提供了一个强有力的模型。生态差异预计将产生多个性状的不同选择，包括神经生物学的。动物必须检测、处理和处理来自周围环境的信息，这些信息的形式可能高度依赖于环境。我们可能会认为，不同的环境不仅会对感觉器官产生不同的选择，还会对负责处理感觉信息的大脑区域产生不同的选择。在这里，我们测试这一假设，使用最近进化的繁殖隔离物种对threespine棘鱼Gasterosteus aculeatus，有很好的描述与生态差异相关的许多形态和行为特征的差异。我们使用最先进的方法，磁共振成像，以获得准确的体积数据的2个感觉处理区，嗅球和视顶盖。我们发现，生态和这些大脑区域的大小相对于总的大脑大小在2个湖泊与完整的物种对之间的紧密相关性。湖沼鱼类，这在很大程度上依赖于视觉，有相对较大的视顶盖和较小的嗅球相比，底栖鱼类，利用嗅觉在更大程度上。与湖沼鱼类相比，底栖鱼类的脑总体积相对于其体型也更大。这些差异在伊诺斯湖的一对崩溃的物种中被抹去了，在那里，人为干扰导致了强烈的杂交。这些数据共同表明，感觉处理区域的进化可以迅速而独立地发生。
Populations that have recently diverged offer a powerful model for studying evolution. Ecological differences are expected to generate divergent selection on multiple traits, including neurobiological ones. Animals must detect, process, and act on information from their surroundings and the form of this information can be highly dependent on the environment. We might expect different environments to generate divergent selection not only on the sensory organs, but also on the brain regions responsible for processing sensory information. Here, we test this hypothesis using recently evolved reproductively isolated species pairs of threespine stickleback fish Gasterosteus aculeatus that have well-described differences in many morphological and behavioral traits correlating with ecological differences. We use a state-of-the-art method, magnetic resonance imaging, to get accurate volumetric data for 2 sensory processing regions, the olfactory bulbs and optic tecta. We found a tight correlation between ecology and the size of these brain regions relative to total brain size in 2 lakes with intact species pairs. Limnetic fish, which rely heavily on vision, had relatively larger optic tecta and smaller olfactory bulbs compared with benthic fish, which utilize olfaction to a greater extent. Benthic fish also had larger total brain volumes relative to their body size compared with limnetic fish. These differences were erased in a collapsed species pair in Enos Lake where anthropogenic disturbance has led to intense hybridization. Together these data indicate that evolution of sensory processing regions can occur rapidly and independently.
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影响因子：
2.1
作者：
Gonda, A.;Herczeg, G.;Merila, J.
通讯作者：
Merila, J.
影响因子：
3.3
作者：
Isler, Karin;van Schaik, Carel P.
通讯作者：
van Schaik, Carel P.
影响因子：
1.4
作者：
BENTZEN, P;RIDGWAY, MS;MCPHAIL, JD
通讯作者：
MCPHAIL, JD
影响因子：
2.7
作者：
HEALY, SD;CLAYTON, NS;KREBS, JR
通讯作者：
KREBS, JR
影响因子：
3.4
作者：
Gonzalez-Voyer A;Winberg S;Kolm N
通讯作者：
Kolm N