评论"生产力是植物物种丰富性的一个糟糕的预测指标"
Jason D Fridley1, J Philip Grime, Michael A Huston
1Department of Biology, Syracuse University, Syracuse, NY 13244, USA. fridley@syr.edu
Science (New York, N.Y.)
|March 24, 2012
概括
重新分析植物多样性数据显示,当包括高生产率,垃圾和人为遗址时,背模型 (HBM) 得到了强烈支持. 之前关于弱关系的结论是由于分析上的局限性.
科学领域:
- 生态生态学 生态生态学
- 植物生物多样性 植物生物多样性
- 生态建模 生态建模
背景情况:
- 背模型 (HBM) 提出了植物生产率的最佳中间水平,以实现最大的物种丰富.
- 阿德勒等人. 阿德勒等人. 报告了生产率和物种丰富度之间的弱和可变关系,挑战了HBM.
- 之前的分析可能受到数据选择和地点纳入标准的限制.
研究的目的:
- 重新评估植物生产率和物种丰富之间的关系.
- 通过使用更正的数据集来评估背模型 (HBM) 的有效性.
- 为了确定以前的分析中的局限性,这些分析对HBM提出了质疑.
主要方法:
- 将高生产率地区纳入数据集.
- 考虑垃圾作为植物多样性的因素.
- 在分析中包括人为遗址.
- 再次分析阿德勒等人. 数据集与更正的参数.
主要成果:
- 经过校正的数据集分析显示,巴支持模型 (HBM) 得到了强烈支持.
- 包含以前被排除的地点类型显著改变了观察到的关系.
- 当考虑所有相关地点时,生产率和物种丰富性呈现出明显的非线性关系.
结论:
- 植物多样性的背模型 (HBM) 在分析全面时是强大的.
- 以前的HBM争议可能源于不完整或有偏见的数据集.
- 进一步的研究应该确保纳入各种场地类型,以便准确地进行生态建模.
相关概念视频
02:22Introduction to Plant Diversity
From Water to Land
01:46The Calvin Benson Cycle
Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
02:07Conservation of Declining Populations
Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
01:06Primary Production
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.
01:01Production Efficiency
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).
02:30Naturalistic Observations
If you want to understand how behavior occurs, one of the best ways to gain information is to simply observe the behavior in its natural context. However, people might change their behavior in unexpected ways if they know they are being observed. How do researchers obtain accurate information when people tend to hide their natural behavior? As an example, imagine that your professor asks everyone in your class to raise their hand if they always wash their hands after using the restroom. Chances...