Long-term diatom biodiversity responses to productivity in lakes of Fuxian and Dianchi

doi:10.17520/biods.2014213

Abstract

Abstract:

To date, productivity-diversity relationships (PDR) in terrestrial ecosystems have predominantly been examined across large spatial scales, while freshwater ecosystem studies typically focus on short-term field surveys. Here sediment records are used to examine the long-term patterns of PDR from two large lakes, Fuxian and Dianchi, which are currently oligo-mesotrophic and hyper-eutrophic, respectively. Changes in lake productivity and community structure were reconstructed based on sedimentary pigment concentrations (i.e. Chl-a) and diatom assemblages. Principal Component Analysis (PCA) of diatom community data showed that primary productivity was the most significant environmental gradient driving diatom community changes in both lakes. Lake productivity was positively correlated to diatom alpha- and beta-diversity indices in Lake Fuxian but negative in Lake Dianchi. The relationship between the magnitude of productivity change and diatom beta-diversity was significantly negative in Lake Dianchi while no trend was found in Lake Fuxian. There was a significantly negative relationship between diatom species richness and community productivity in Lake Dianchi, suggesting the influence of increased species richness in enhancing community productivity was overridden by human disturbances. Disturbance associated changes in limnological properties not only caused the loss of biodiversity, but also directly promoted diatom production through intensive nutrient enrichment.

Key words: Yunnan lakes, diatoms, temporal scale, sediment pigment, eutrophication, biodiversity

Xiaolin Chen, Guangjie Chen, Huibin Lu, Xiaodong Liu, Hucai Zhang. Long-term diatom biodiversity responses to productivity in lakes of Fuxian and Dianchi[J]. Biodiv Sci, 2015, 23(1): 89-100.

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URL: https://www.biodiversity-science.net/EN/10.17520/biods.2014213

https://www.biodiversity-science.net/EN/Y2015/V23/I1/89

Figures/Tables 7

Table 1 Summary of key limnological features for Fuxian and Dianchi lakes

湖泊 Lake	水域面积 Surface area (km²)*	最大水深 Maximal depth (m)^#	平均水深 Mean depth (m)^#	pH	总氮 TN (μg/L)	总磷 TP (μg/L)	叶绿素a Chl-a (μg/L)
抚仙湖 Fuxian Lake	216.6	155	89.7	9.0	136.7	10.0	1.4
滇池 Dianchi Lake	298.0	6.5	2.9	9.1	3,548.0	192.0	62.0

Fig. 1 Site maps showing the coring locations at Fuxian Lake and Dianchi Lake. Coring sites are labeled as black circles.

Fig. 2 Stratigraphic plots showing sedimentary pigment and diatom community (relative abundance) changes at Fuxian Lake (a) and Dianchi Lake (b). Only diatom taxa with relative abundance not less than 5% were shown.

Fig. 3 PCA biplots of diatom assemblages for Fuxian (a) and Dianchi (b) lakes. Arrows and circles represent dominant diatom taxa and samples, respectively. Full names for the abbreviated diatom taxa are listed above.

Fig. 4 Scatter plots showing the relationships among the three indices of diatom α diversity and sedimentary Chl-a concentrations at Fuxian Lake (a, b, c) and Dianchi Lake (d, e, f), respectively

Fig. 5 Scatter plots showing the relationships between diatom β diversity and mean Chl-a levels and magnitude of sedimentary Chl-a changes at Fuxian Lake (a, b) and Dianchi Lake (c, d), respectively

Fig. 6 Scatter plots showing the long-term relationships between diatom species richness and diatoxanthin concentrations at Fuxian Lake (a) and Dianchi Lake (b), respectively

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