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The Relationship between Phytoplankton Evenness and Copepod Abundance in Lake Nansihu, China

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ABSTRACT

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.

No MeSH data available.


Location of Lake Nansihu and sampling sites in the lake. The figure was made by ArcGIS version 10.0 (ESRI, Redlands, CA, USA).
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ijerph-13-00855-f001: Location of Lake Nansihu and sampling sites in the lake. The figure was made by ArcGIS version 10.0 (ESRI, Redlands, CA, USA).

Mentions: Lake Nansihu (116°34′E–117°21′E, 34°27′N–35°20′N), located in the northern of the Huai River Basin, is the largest freshwater lake in North China (Figure 1). The lake actually comprises four connected lakes: Nanyang, Dushan, Zhaoyang and Weishan. The total water area is 1266 km2 and the total capacity is 6.37 × 109 m3. The average water depth of the lake is 1.5 m and it is categorized as a shallow, open and plain grassland lake. The lake experiences a warm temperate monsoon climate with an annual average temperature of 13.7 °C. Annual rainfall varies from 550 mm to 720 mm, with nearly 60% of precipitation occurring during the summer rainy season.


The Relationship between Phytoplankton Evenness and Copepod Abundance in Lake Nansihu, China
Location of Lake Nansihu and sampling sites in the lake. The figure was made by ArcGIS version 10.0 (ESRI, Redlands, CA, USA).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5036688&req=5

ijerph-13-00855-f001: Location of Lake Nansihu and sampling sites in the lake. The figure was made by ArcGIS version 10.0 (ESRI, Redlands, CA, USA).
Mentions: Lake Nansihu (116°34′E–117°21′E, 34°27′N–35°20′N), located in the northern of the Huai River Basin, is the largest freshwater lake in North China (Figure 1). The lake actually comprises four connected lakes: Nanyang, Dushan, Zhaoyang and Weishan. The total water area is 1266 km2 and the total capacity is 6.37 × 109 m3. The average water depth of the lake is 1.5 m and it is categorized as a shallow, open and plain grassland lake. The lake experiences a warm temperate monsoon climate with an annual average temperature of 13.7 °C. Annual rainfall varies from 550 mm to 720 mm, with nearly 60% of precipitation occurring during the summer rainy season.

View Article: PubMed Central - PubMed

ABSTRACT

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.

No MeSH data available.