生产力梯度和扩散如何在植物-草食动物放牧系统中形成模式?
Sounov Marick1, Fugo Takasu2, Nandadulal Bairagi1
1Centre for Mathematical Biology and Ecology, Department of Mathematics, Jadavpur University, Kolkata 700032, India.
Journal of theoretical biology
|May 22, 2024
概括
这项研究使用反应扩散系统模拟了植物-草食动物相互作用,揭示了草食动物分散模式影响植被异质性. 草食动物的高度分散可能导致自上而下的控制,改变生态系统动态和物种生存.
科学领域:
- 生态生态学 生态生态学
- 数学生物学 数学生物学
- 人口动态 人口动态
背景情况:
- 自然生态系统表现出不齐全的植被分布.
- 反应-扩散模型可以模拟物种异质性.
- 植物 - 草食动物相互作用对生态系统结构至关重要.
研究的目的:
- 分析植物-草食动物相互作用的二维反应-扩散模型.
- 研究相对草食动物分散在产生空间异质性的作用.
- 检查生产率和初始条件如何影响人口分布和控制机制.
主要方法:
- 开发了一种空间时空反应-扩散模型,用于植物-食草动物动态.
- 分析了扩散驱动 (图灵) 不稳定的条件.
- 包含相对的草食动物分散 (从高植被到低植被区域的移动) 与自我扩散一起.
主要成果:
- 随着大量的相对草食动物分散,异质性出现;低分散性保持同质性.
- 在非空间模型中的二元性导致空间时空模型中的初始值依赖模式形成.
- 较高的相对草食动物分散可以诱导自上而下的控制,草食动物调节植被,与非空间的自下而上的控制形成鲜明对比.
结论:
- 草食动物的相对分散是推动植物-草食动物系统空间异质性的关键因素.
- 生态系统的控制可以从下方向上转向上方,这取决于草食动物的分散率和生产力.
- 该模型根据分散和环境条件预测复杂的植被模式和物种共存或灭绝.
相关概念视频
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
01:32What is Natural Selection?
115.1K
Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
115.1K
02:40Epiphytes, Parasites, and Carnivores
13.0K
Plants often form mutualistic relationships with soil-dwelling fungi or bacteria to enhance their roots’ nutrient uptake ability. Root-colonizing fungi (e.g., mycorrhizae) increase a plant’s root surface area, which promotes nutrient absorption. While root-colonizing, nitrogen-fixing bacteria (e.g., rhizobia) convert atmospheric nitrogen (N2) into ammonia (NH3), making nitrogen available to plants for various biological functions. For example, nitrogen is essential for the...
13.0K
02:26Defenses Against Pathogens and Herbivores
23.6K
Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a proper immune system, have developed an array of constitutive and inducible defenses to fend off these attacks.
23.6K
02:12Short-distance Transport of Resources
16.0K
Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
16.0K
01:46Types of Selection
40.4K
Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
40.4K