Functional traits of submerged macrophytes in eutrophic shallow lakes affect their ecological functions

2020 ◽  
pp. 143332
Author(s):  
Han Liu ◽  
Guihua Liu ◽  
Wei Xing
Keyword(s):  
Functional Traits ◽  
Shallow Lakes ◽  
Submerged Macrophytes ◽  
Ecological Functions ◽  
Eutrophic Shallow Lakes

scholarly journals Omnivorous shrimp Neocaridina denticulata sinensis enhances the growth of submerged macrophyte Vallisneria denseserrulata

2019 ◽  
pp. 32 ◽  
Author(s):  
Jialiang Ye ◽  
Yali Tang ◽  
Xiufeng Zhang ◽  
Ping Zhong ◽  
Zhengwen Liu
Keyword(s):  
Growth Rate ◽  
Shallow Lakes ◽  
Phytoplankton Biomass ◽  
Leaf Surface ◽  
Submerged Macrophytes ◽  
Submerged Macrophyte ◽  
Lake Eutrophication ◽  
Shading Effects ◽  
Neocaridina Denticulata ◽  
Eutrophic Shallow Lakes

Lake eutrophication often causes declines and even losses of submerged macrophytes through the shading effects of increased periphyton and phytoplankton. The Chinese swamp shrimp Neocaridina denticulata sinensis Kemp (Decapoda, Atyidae) is a common omnivore in Chinese lakes, where its presence may impact both periphyton and phytoplankton, with previously unstudied consequences for submerged macrophytes. Here, using a mesocosm experiment, we studied the effect of N. d. sinensis on periphyton, phytoplankton and the submerged macrophyte Vallisneria denseserrulata. Results showed that in the presence of N. d. sinensis, the biomass of periphyton on the leaves of V. denseserrulata was significantly reduced, and that growth rate of V. denseserrulata increased. The presence of N. d. sinensis also significantly increased the total phosphorus concentrations in the water column and phytoplankton biomass (chlorophyll-a). The enhanced growth of V. denseserrulata is likely to be linked to improved light harvesting due to the reduced periphyton attached to their leaf surface. The results suggest that stocking with Chinese swamp shrimps may enhance the development of macrophytes in eutrophic shallow lakes.

scholarly journals Relationship between Bacterial Community Composition and Bottom-Up versus Top-Down Variables in Four Eutrophic Shallow Lakes

2002 ◽  
Vol 68 (10) ◽  
pp. 4740-4750 ◽  
Author(s):  
Koenraad Muylaert ◽  
Katleen Van der Gucht ◽  
Nele Vloemans ◽  
Luc De Meester ◽  
Moniek Gillis ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Community Composition ◽  
Shallow Lakes ◽  
Bacterial Community Composition ◽  
Top Down ◽  
Bottom Up ◽  
Rdna Genes ◽  
Explanatory Variables ◽  
High Nutrient ◽  
Eutrophic Shallow Lakes

ABSTRACT Bacterial community composition was monitored in four shallow eutrophic lakes during one year using denaturing gradient gel electrophoresis (DGGE) of PCR-amplified prokaryotic rDNA genes. Of the four lakes investigated, two were of the clearwater type and had dense stands of submerged macrophytes while two others were of the turbid type characterized by the occurrence of phytoplankton blooms. One turbid and one clearwater lake had high nutrient levels (total phosphorus, >100 μg liter−1) while the other lakes had relatively low nutrient levels (total phosphorus, <100 μg liter−1). For each lake, seasonal changes in the bacterial community were related to bottom-up (resources) and top-down (grazers) variables by using canonical correspondence analysis (CCA). Using an artificial model dataset to which potential sources of error associated with the use of relative band intensities in DGGE analysis were added, we found that preferential amplification of certain rDNA genes over others does not obscure the relationship between bacterial community composition and explanatory variables. Besides, using this artificial dataset as well as our own data, we found a better correlation between bacterial community composition and explanatory variables by using relative band intensities compared to using presence/absence data. While bacterial community composition was related to phytoplankton biomass in the high-nutrient lakes no such relation was found in the low-nutrient lakes, where the bacterial community is probably dependent on other organic matter sources. We used variation partitioning to evaluate top-down regulation of bacterial community composition after bottom-up regulation has been accounted for. Using this approach, we found no evidence for top-down regulation of bacterial community composition in the turbid lakes, while grazing by ciliates and daphnids (Daphnia and Ceriodaphnia) was significantly related to changes in the bacterial community in the clearwater lakes. Our results suggest that in eutrophic shallow lakes, seasonality of bacterial community structure is dependent on the dominant substrate source as well as on the food web structure.

Immobilization and Release Behavior of Phosphorus on Phoslock-Inactivated Sediment under Conditions Simulating the Photic Zone in Eutrophic Shallow Lakes

2019 ◽  
Vol 53 (21) ◽  
pp. 12449-12457 ◽  
Author(s):  
Xiaodi Li ◽  
Zhiyong Zhang ◽  
Qiang Xie ◽  
Renjie Yang ◽  
Tong Guan ◽  
...  
Keyword(s):  
Shallow Lakes ◽  
Photic Zone ◽  
Release Behavior ◽  
Eutrophic Shallow Lakes

scholarly journals The Response of Regeneration Ability of Myriophyllum spicatum Apical Fragments to Decaying Cladophora oligoclona

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 1014 ◽  
Author(s):  
Lu Zhang ◽  
Suzhen Huang ◽  
Xue Peng ◽  
Biyun Liu ◽  
Yi Zhang ◽  
...  
Keyword(s):  
Submerged Macrophytes ◽  
Sugar Content ◽  
Myriophyllum Spicatum ◽  
Life History Strategy ◽  
Regeneration Ability ◽  
Filamentous Green Algae ◽  
Related Enzyme ◽  
Early Regeneration ◽  
Physiological And Biochemical ◽  
Eutrophic Shallow Lakes

During the restoration of eutrophic shallow lakes, submerged macrophyte recovery is often accompanied by an excessive proliferation of filamentous green algae (FGA). This can lead to the recession or even disappearance of the submerged macrophytes in these lakes. However, the use of plant fragments in reproduction and dispersion is an important life history strategy for submerged macrophytes. In this work, it studied apical fragment propagation in Myriophyllum spicatum and its physiological and biochemical responses to the decomposing liquid of Cladophora oligoclona. Myriophyllum spicatum apical fragments showed no new roots or buds when treated with 0.4 times the original decomposing liquid, and their PSII functional parameters were lower than those of the control. In contrast, the relevant sugar content accumulated to 115.26%, and the activities of an energy enzyme (Ca2+/Mg2+-ATPase) and a secondary metabolic-related enzyme (PAL) increased by 490.63% and 28.13%, showing an elevated defense response. These results indicated that the early regeneration of M. spicatum could be hindered by environmental stress, and that this may further affect the reproduction and colonization of these submerged macrophytes.

Benthic carbon is inefficiently transferred in the food webs of two eutrophic shallow lakes

2017 ◽  
Vol 62 (10) ◽  
pp. 1693-1706 ◽  
Author(s):  
Betty Lischke ◽  
Thomas Mehner ◽  
Sabine Hilt ◽  
Katrin Attermeyer ◽  
Mario Brauns ◽  
...  
Keyword(s):  
Food Webs ◽  
Shallow Lakes ◽  
Eutrophic Shallow Lakes

scholarly journals Quantitative Assessment of Ammonia-Oxidizing Bacterial Communities in the Epiphyton of Submerged Macrophytes in Shallow Lakes

2010 ◽  
Vol 76 (6) ◽  
pp. 1813-1821 ◽  
Author(s):  
M. Coci ◽  
G. W. Nicol ◽  
G. N. Pilloni ◽  
M. Schmid ◽  
M. P. Kamst-van Agterveld ◽  
...  
Keyword(s):  
16S Rrna ◽  
Shallow Lakes ◽  
Submerged Macrophytes ◽  
16S Rrna Genes ◽  
Rrna Genes ◽  
Gene Copy ◽  
Potamogeton Pectinatus ◽  
Rrna Gene ◽  
Ammonia Oxidizing Bacteria ◽  
Potential Nitrification

ABSTRACT In addition to the benthic and pelagic habitats, the epiphytic compartment of submerged macrophytes in shallow freshwater lakes offers a niche to bacterial ammonia-oxidizing communities. However, the diversity, numbers, and activity of epiphytic ammonia-oxidizing bacteria have long been overlooked. In the present study, we analyzed quantitatively the epiphytic communities of three shallow lakes by a potential nitrification assay and by quantitative PCR of 16S rRNA genes. On the basis of the m2 of the lake surface, the gene copy numbers of epiphytic ammonia oxidizers were not significantly different from those in the benthic and pelagic compartments. The potential ammonia-oxidizing activities measured in the epiphytic compartment were also not significantly different from the activities determined in the benthic compartment. No potential ammonia-oxidizing activities were observed in the pelagic compartment. No activity was detected in the epiphyton of Chara aspera, the dominant submerged macrophyte in Lake Nuldernauw in The Netherlands. The presence of ammonia-oxidizing bacterial cells in the epiphyton of Potamogeton pectinatus was also demonstrated by fluorescent in situ hybridization microscopy images. By comparing the community composition as assessed by the 16S rRNA gene PCR-denaturing gradient gel electrophoresis approach, it was concluded that the epiphytic ammonia-oxidizing communities consisted of cells that were also present in the benthic and pelagic compartments. Of the environmental parameters examined, only the water retention time, the Kjeldahl nitrogen content, and the total phosphorus content correlated with potential ammonia-oxidizing activities. None of these parameters correlated with the numbers of gene copies related to ammonia-oxidizing betaproteobacteria.

scholarly journals Seasonality and Species Specificity of Submerged Macrophyte Biomass in Shallow Lakes Under the Influence of Climate Warming and Eutrophication

2021 ◽  
Vol 12 ◽  
Author(s):  
Haoping Wu ◽  
Beibei Hao ◽  
Hyunbin Jo ◽  
Yanpeng Cai
Keyword(s):  
Climate Warming ◽  
Shallow Lakes ◽  
Nutrient Enrichment ◽  
Plant Biomass ◽  
Submerged Macrophytes ◽  
Anthropogenic Activities ◽  
Species Specificity ◽  
Growth Responses ◽  
Potamogeton Crispus ◽  
Explanatory Factors

Climate warming and eutrophication caused by anthropogenic activities strongly affect aquatic ecosystems. Submerged macrophytes usually play a key role in shallow lakes and can maintain a stable clear state. It is extremely important to study the effects of climate warming and eutrophication on the growth of submerged macrophytes in shallow lakes. However, the responses of submerged macrophytes to climate warming and eutrophication are still controversial. Additionally, the understanding of the main pathways impacting submerged macrophytes remains to be clarified. In addition, the influence of seasonality on the growth responses of submerged macrophytes to climate warming and eutrophication requires further elucidation. In this study, we conducted a series of mesocosm experiments with four replicates across four seasons to study the effects of rising temperature and nutrient enrichment on the biomass of two submerged macrophytes, Potamogeton crispus and Elodea canadensis. Our results demonstrated the seasonality and species specificity of plant biomass under the influence of climate warming and eutrophication, as well as the main explanatory factors in each season. Consistent with the seasonal results, the overall results showed that E. canadensis biomass was directly increased by rising temperature rather than by nutrient enrichment. Conversely, the overall results showed that P. crispus biomass was indirectly reduced by phosphorus enrichment via the strengthening of competition among primary producers. Distinct physiological and morphological traits may induce species-specific responses of submerged macrophytes to climate warming and eutrophication, indicating that further research should take interspecies differences into account.

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