相关实验视频
Updated: Jun 19, 2025

08:20
A Method for Quantifying Foliage-Dwelling Arthropods
Published on: October 20, 2019
5.8K
干旱耐受性和物种丰富性介导干旱季节在热带森林中负密度依赖
Xiaoyang Song1, Masatoshi Katabuchi1, Jonathan M Chase2,3
1CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan, China.
Ecology
|July 26, 2024
概括
同特定负密度依赖 (CNDD) 在植物物种和季节之间存在显著差异. 了解物种特征和环境因素对于解释这种变异及其对植物多样性的影响至关重要.
科学领域:
- 生态生态学 生态生态学
- 植物生物学 植物生物学
- 生物多样性科学 生物多样性科学
背景情况:
- 同特定负密度依赖 (CNDD) 是维持植物多样性的关键因素.
- CNDD的强度表现出显著的空间,时间和物种间的变化.
- 对CNDD变异的相关值在很大程度上未得到量化,这阻碍了全面的理解.
研究的目的:
- 量化CNDD强度的跨种类和时间变化.
- 检查CNDD变异和物种功能特征 (耐旱,防御,资源获取) 和丰度之间的关系.
- 调查环境季节性如何影响CNDD动态.
主要方法:
- 利用来自季节性热带森林的10年苗木监测数据.
- 采用贝叶斯层次模型来分析幼苗的存活率和密度.
- 每年收集干旱和雨季的数据.
主要成果:
- 在干旱季节,更高的同物种种苗密度会对种苗的存活产生负面影响.
- 在雨季,更高的同类成体密度对幼苗的存活产生了负面影响.
- 跨物种CNDD变异与干旱季干旱耐受性特征有关.
- 不耐干旱的物种在潮湿的干旱季节经历了较少的CNDD;耐干旱的物种在干旱的干旱季节经历了较少的CNDD.
- 稀有物种在干旱季节表现出更强的CNDD.
结论:
- CNDD的强度在物种之间和随时间而异.
- 环境和功能背景,包括季节性和物种特征,显著影响CNDD.
- 对CNDD的细微理解需要考虑这些相互作用的因素.
相关概念视频
Ecological Disturbance
17.0K
An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.
17.0K
Distribution and Dispersion
21.7K
To understand intra-specific interactions in populations, scientists measure the spatial arrangement of species individuals. This geographic arrangement is known as the species distribution or dispersion. Highly territorial species exhibit a uniform distribution pattern, in which individuals are spaced at relatively equal distances from one another. Species that are highly tied to particular resources, such as food or shelter, tend to concentrate around those resources, and thus exhibit a...
21.7K
Frequency-dependent Selection
21.9K
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.
21.9K
Responses to Drought and Flooding
10.6K
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
10.6K
Ecological Succession
17.2K
Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...
17.2K
Habitat Fragmentation
17.5K
Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
17.5K

