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

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.


Relationships between phytoplankton evenness and copepod abundance in different seasons.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC5036688&req=5

ijerph-13-00855-f005: Relationships between phytoplankton evenness and copepod abundance in different seasons.

Mentions: Phytoplankton evenness was negatively correlated with copepod abundance in all four seasons (spring, R = −0.532, p < 0.001; summer, R = −0.355, p < 0.05; autumn, R = −0.372, p < 0.05; winter, R = −0.616, p < 0.001). A Linear Mixed Effects Model showed that phytoplankton evenness was significantly correlated with the abundance of copepods throughout the year (Table 2; Figure 5), with regression slopes of −76.57 (t = −3.78, p < 0.001), −46.83 (t = −2.53, p = 0.021), −83.03 (t = −2.97, p = 0.005), and −44.16 (t = −2.39, p = 0.023), respectively.


The Relationship between Phytoplankton Evenness and Copepod Abundance in Lake Nansihu, China
Relationships between phytoplankton evenness and copepod abundance in different seasons.
© Copyright Policy
Related In: Results  -  Collection

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

ijerph-13-00855-f005: Relationships between phytoplankton evenness and copepod abundance in different seasons.
Mentions: Phytoplankton evenness was negatively correlated with copepod abundance in all four seasons (spring, R = −0.532, p < 0.001; summer, R = −0.355, p < 0.05; autumn, R = −0.372, p < 0.05; winter, R = −0.616, p < 0.001). A Linear Mixed Effects Model showed that phytoplankton evenness was significantly correlated with the abundance of copepods throughout the year (Table 2; Figure 5), with regression slopes of −76.57 (t = −3.78, p < 0.001), −46.83 (t = −2.53, p = 0.021), −83.03 (t = −2.97, p = 0.005), and −44.16 (t = −2.39, p = 0.023), respectively.

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.