在食草鱼鱼类中,表型趋同更强,更频繁
M A Kolmann1, E Poulin2, J Rosen1
1Department of Biology, University of Louisville, Louisville, KY 40208, USA.
Integrative and comparative biology
|May 9, 2024
概括
进化上的限制推动了草食鱼类的融合进化,特别是果食鱼类和叶食鱼类. 这些食植物的鱼类表现出较慢的表型演变,但显示出显著的融合,特别是在牙和形态方面.
科学领域:
- 进化生物学 进化生物学
- 比较解剖学的比较解剖学
- 生态生态学 生态生态学
背景情况:
- 现型进化受到功能,发育和选择性压力的约束,导致趋同进化.
- 远鱼为研究进化趋同提供了多样化的模型,因为它们的生态角色各不相同.
- 之前关于鱼类养系统的研究主要由海洋物种和淡水类动物主导,在了解新热带淡水草食动物方面存在差距.
研究的目的:
- 研究来自新热带淡水环境的海豚和帕库斯 (Serrasalmidae) 的养生态和相关形态的演变.
- 为了确定是否由于强烈的进化约束,在食草鱼中表型趋同更为普遍.
- 评估与其他饮食协会相比,食草的进化速率和可变性.
主要方法:
- 利用骨科微型计算机断层成像 (μCT) 来分析海豚和鱼的形态变异.
- 检查了饮食和养行为,以分类生态角色.
- 通过使用牙,下巴和腹部形态测量数据集评估进化速率和趋同.
主要成果:
- 草食动物在生态上是可行的,过渡率与食肉动物和食肉动物相似.
- 在草食鱼类中记录了广泛的表型趋同,与食肉动物相比,进化速度较慢.
- 通过多个数据集的积极指标表明的完全趋同的实例,仅在食草动物中发现,特别是果食动物和叶食动物.
结论:
- 草食鱼类在显著的约束下进化,导致明显的表型趋同.
- 尽管存在限制,但食草并没有限制这些鱼类的生态适应能力.
- 这项研究强调了Serrasalmidae作为一个关键群体,以了解草食动物的进化和淡水鱼类的融合.
相关概念视频
01:54Convergent Evolution
27.7K
Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
27.7K
02:39Predator-Prey Interactions
16.2K
Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
16.2K
01:07Speciation Rates
21.2K
Overview
21.2K
01:21Frequency-dependent Selection
22.0K
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
22.0K
02:29Hybrid Zones
17.0K
Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.
17.0K
02:32Osmoregulation in Fishes
49.6K
When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
49.6K