Tian Wang, Zhang Huayong, Zhao Lei, Xu Xiang, Huang Hai
Research Center for Engineering Ecology and Nonlinear Science, North China Electric Power University, Beijing 102206, China.
Int J Environ Res Public Health. 2016 Aug 31;13(9):855. doi: 10.3390/ijerph13090855.
The relationship between biodiversity and ecosystem functioning is a central issue in ecology. Previous studies have shown that producer diversity can impact the consumer community via predator-prey interactions. However, direct observations of this relationship remain rare, in particular for aquatic ecosystems. In this research, the relationship between phytoplankton diversity (species richness and evenness) and the abundance of copepods was analyzed in Lake Nansihu, a meso-eutrophic lake in China. The results showed that copepods abundance was significantly decreased with increasing phytoplankton evenness throughout the year. However, both species richness and phytoplankton biomass showed no significant relationship with the abundance of copepods. Canonical correspondence analysis revealed that phytoplankton evenness was negatively correlated with Thermocyclops kawamurai, Cyclops vicinus, Eucyclops serrulatus, Mesocyclops leuckarti, Sinocalanus tenellus, Sinocalanus dorrii, Copepods nauplius, but positively correlated with many Cyanophyta species (Chroococcus minutus, Dactylococcopsis acicularis, Microcystis incerta, Merismopedia tenuissima, Merismopedia sinica and Lyngbya limnetica). Based on our results, phytoplankton evenness was a better predictor of copepods abundance in meso-eutrophic lakes. These results provide new insights into the relationship between diversity and ecosystem functioning in aquatic ecosystems.
生物多样性与生态系统功能之间的关系是生态学中的核心问题。以往研究表明，生产者多样性可通过捕食者 - 猎物相互作用影响消费者群落。然而，对这种关系的直接观测仍然很少，尤其是对于水生生态系统而言。在本研究中，分析了中国中富营养化湖泊南四湖浮游植物多样性（物种丰富度和均匀度）与桡足类丰度之间的关系。结果表明，全年桡足类丰度随浮游植物均匀度增加而显著降低。然而，物种丰富度和浮游植物生物量与桡足类丰度均无显著关系。典范对应分析表明，浮游植物均匀度与 Kawamurai 温剑水蚤、近邻剑水蚤、锯缘真剑水蚤、罗氏中剑水蚤、细巧华哲水蚤、火腿许水蚤、桡足类无节幼体呈负相关，但与许多蓝藻物种（微小色球藻、针状指杆藻、不定微囊藻、细薄平裂藻、中华平裂藻和湖沼颤藻）呈正相关。基于我们的研究结果，浮游植物均匀度是中富营养化湖泊中桡足类丰度的更好预测指标。这些结果为水生生态系统中多样性与生态系统功能之间的关系提供了新的见解。
