有机体的权衡和浮游生物生命的节奏
1Centre for Ocean Life, DTU Aqua, Technical University of Denmark, 2800 Kgs, Kemitorvet, Kgs. Lyngby, Denmark.
概括
生物的权衡决定了生态系统的形状,迫使生命历史战略,比如平衡食与避免捕食者. 这为浮游生物的生命节奏创造了基本的缓慢-快速梯度.
科学领域:
- 生态生态学 生态生态学
- 进化生物学 进化生物学
- 海洋生物学 海洋生物学
背景情况:
- 生物体面临着固有的权衡,在一个领域的卓越会损害另一个领域的表现.
- 了解这些权衡对生态学和基于特征的生态系统建模至关重要.
- 浮游生物体表现出由这些基本约束影响的多样化策略.
研究的目的:
- 综合了浮游生物在不同热带层次 (从细菌到动物浮游生物) 的权衡证据.
- 为了证明由这些权衡驱动的缓慢快速的人生历史梯度的出现.
- 探索资源获取,生存和繁殖中的权衡如何塑造浮游生物.
主要方法:
- 关于浮游生物的权衡现有研究的文献综合.
- 专注于与达尔文健身组件相关的权衡:资源获取,生存和传播.
- 分析行为,如日间垂直迁移和防御机制,作为权衡的例子.
主要成果:
- 动物浮游生物的日间垂直迁徙是食和避免捕食者之间的权衡的例子.
- 防御机制 (例如,毒素,逃避行为) 代表了难以量化的成本.
- 为生长,繁殖和维持资源的分配,以及寻找伴侣,进一步说明了权衡.
结论:
- 众多权衡的综合效应导致了生命历史步伐的基本缓慢快速梯度.
- 这种梯度是有机体生命史的关键组织原则.
- 通过理解这种权衡结晶,可以简化海洋生态系统的基于特征的模型.
相关概念视频
00:51Energy Budgets
9.2K
Organisms must balance energy intake with the energy required for growth, maintenance and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species, like annual plants, have only one reproductive episode in their lifetimes and consequently have short lifespans. Iteroparous species, by contrast, have many reproductive events during their lifetimes but have relatively few offspring. These two...
9.2K
01:29Life Histories
17.9K
Overview
17.9K
01:06Primary Production
23.6K
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
23.6K
01:01Production Efficiency
16.8K
Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).
16.8K
01:07Speciation Rates
21.2K
Overview
21.2K
01:38Limits to Natural Selection
31.2K
Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
31.2K