Long-Term Effects of the Harvesting of Trapa natans on Local Water Quality and Aquatic Macrophyte Community in Lake Erhai, China

Trapanatans is one of the main species causing the swamping in the littoral zones of Erhai Lake. It commonly forms a dense canopy on the water surface in the growing season (June–September), which hampers the local water quality and habitat of submerged macrophytes, and releases nutrients to the water after death in autumn and winter, resulting in the deterioration of local water quality. At present, there are many and positive research studies on the short-term effects of harvesting water chestnut on water quality and aquatic plants, but long-term observation results are lacking. In response to the above problems, we studied responses of water quality and aquatic plant community to the removal of Trapa in littoral zone of a northern bay in Erhai from August 2014 to January 2017. This could be the first attempt to discover the long-term effects of floating-leaved vegetation management in the freshwater ecosystem. The results showed that the artificial removal of Trapa significantly improved the local water quality in the growing season, for example, the concentrations of total nitrogen (TN), dissolved nitrogen (DN), total phosphorus (TP), and dissolved phosphorus (DP) in the non-Trapa zone (NTZ) were much lower than the concentrations of those in the adjacent Trapa zone (TZ). And the biomass of aquatic macrophyte community (BAMC) was significantly increased in the NTZ, up to the maximum value of about 21 kg/m2 in fresh weight. However, the diversity indexes of the community in the NTZ declined. Therefore, we suggested that although the removal of Trapa improved the water quality and increased the productivity of the submerged aquatic plant community, it reduced the species diversity of the aquatic plant community in the long run. This is another issue that we need to pay attention to in the later management in Erhai Lake.

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Effects of harvest management of Trapa bispinosa on an aquatic macrophyte community and water quality in a eutrophic lake

Ecological Engineering ◽

10.1016/j.ecoleng.2013.12.028 ◽

2014 ◽

Vol 64 ◽

pp. 120-129 ◽

Cited By ~ 12

Author(s):

Weiwei Xu ◽

Weiping Hu ◽

Jiancai Deng ◽

Jinge Zhu ◽

Qinqin Li

Keyword(s):

Water Quality ◽

Aquatic Macrophyte ◽

Eutrophic Lake ◽

Harvest Management ◽

Macrophyte Community ◽

Aquatic Macrophyte Community

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Operational Control of Eurasian Watermilfoil (Myriophyllum spicatum) and Impacts to the Native Submersed Aquatic Macrophyte Community in Lake Pend Oreille, Idaho

Invasive Plant Science and Management ◽

10.1614/ipsm-d-14-00008.1 ◽

2015 ◽

Vol 8 (2) ◽

pp. 219-232 ◽

Cited By ~ 1

Author(s):

John D. Madsen ◽

Ryan M. Wersal ◽

Thomas E. Woolf

Keyword(s):

Plant Community ◽

Native Species ◽

Littoral Zone ◽

Aquatic Macrophyte ◽

Myriophyllum Spicatum ◽

Native Plant ◽

Eurasian Watermilfoil ◽

Macrophyte Community ◽

Native Plant Community ◽

Aquatic Macrophyte Community

Lake Pend Oreille is the largest (36,000 ha or 91,000 ac) freshwater lake in Idaho. Approximately 27% or 10,000 ha of the lake is littoral zone habitat supporting aquatic macrophyte growth. Eurasian watermilfoil has invaded large areas of this littoral zone habitat, with early estimates suggesting approximately 2,000 ha by the mid 2000s. Idaho State Department of Agriculture developed a state-wide eradication program in response to the threats posed by Eurasian watermilfoil, which attempts to quantify Eurasian watermilfoil infestations and its effects on the native plant community. Littoral zone point intercept surveys were conducted in 2007 and 2008 to monitor the trends in aquatic macrophyte community structure and assess management strategies against Eurasian watermilfoil. Lake Pend Oreille has a species-rich aquatic macrophyte community of more than 50 species. Lake-wide, the presence of Eurasian watermilfoil significantly decreased from 2007 (12.5%) to 2008 (7.9%). The native plant community has remained stable from 2007 to 2008 despite lake-wide management activities. In managed areas, the frequency of Eurasian watermilfoil during the 2008 assessment was 23.6% after herbicide applications. This represents a 63% reduction in Eurasian watermilfoil presence from the 2007 (64.5%) survey. When 2,4-D was combined with endothall, the presence of Eurasian watermilfoil declined from 63% (2007) to 36.5% in 2008. Eurasian watermilfoil treated with triclopyr also declined significantly, 64% to 18.2%. When all treatment methods were pooled and compared with areas that were not treated, the presence of Eurasian watermilfoil was significantly greater (52.5%) in untreated areas as opposed to treated areas (23%). The removal of Eurasian watermilfoil resulted in an increase in native species in most areas. Currently, there is as little as 200 ha of Eurasian watermilfoil remaining, which represents an overall reduction of 90% in approximately 7 yr of management.

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Aquatic macrophyte community varies in urban reservoirs with different degrees of eutrophication

Acta Limnologica Brasiliensia ◽

10.1590/s2179-975x2014000200004 ◽

2014 ◽

Vol 26 (2) ◽

pp. 129-142 ◽

Cited By ~ 3

Author(s):

Suelen Cristina Alves da Silva ◽

Armando Carlos Cervi ◽

Cleusa Bona ◽

André Andrian Padial

Keyword(s):

Species Richness ◽

Temporal Variation ◽

Indicator Species ◽

Beta Diversity ◽

Aquatic Macrophytes ◽

Aquatic Macrophyte ◽

Wiener Index ◽

Spatial And Temporal Variation ◽

Macrophyte Community ◽

Aquatic Macrophyte Community

AIM: Investigate spatial and temporal variation in the aquatic macrophyte community in four urban reservoirs located in Curitiba metropolitan region, Brazil. We tested the hypothesis that aquatic macrophyte community differ among reservoirs with different degrees of eutrophication. METHODS: The reservoirs selected ranged from oligotrophic/mesotrophic to eutrophic. Sampling occurred in October 2011, January 2012 and June 2012. Twelve aquatic macrophytes stands were sampled at each reservoir. Species were identified and the relative abundance of aquatic macrophytes was estimated. Differences among reservoirs and over sampling periods were analyzed: i) through two‑way ANOVAs considering the stand extent (m) and the stand biodiversity - species richness, evenness, Shannon-Wiener index and beta diversity (species variation along the aquatic macrophyte stand); and ii) through PERMANOVA considering species composition. Indicator species that were characteristic for each reservoir were also identified. RESULTS: The aquatic macrophyte stand extent varied among reservoirs and over sampling periods. Species richness showed only temporal variation. On the other hand, evenness and Shannon-Wiener index varied only among reservoirs. The beta diversity of macrophyte stands did not vary among reservoirs or over time, meaning that species variability among aquatic macrophyte stands was independent of the stand extent and reservoir eutrophication. Community composition depended on the reservoir and sampling period. CONCLUSIONS: Our results support our initial expectation that reservoirs of different degrees of eutrophication have different aquatic macrophyte communities. As a consequence, each reservoir had particular indicator species. Therefore, monitoring and management efforts must be offered for each reservoir individually.

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The Biodiversity–Biomass Relationship of Aquatic Macrophytes Is Regulated by Water Depth: A Case Study of a Shallow Mesotrophic Lake in China

Frontiers in Ecology and Evolution ◽

10.3389/fevo.2021.650001 ◽

2021 ◽

Vol 9 ◽

Author(s):

Fei Ma ◽

Lei Yang ◽

Tian Lv ◽

Zhenjun Zuo ◽

Haocun Zhao ◽

...

Keyword(s):

Water Depth ◽

Aquatic Macrophyte ◽

Interspecific Interactions ◽

Species Identity ◽

Community Biomass ◽

Macrophyte Communities ◽

Macrophyte Community ◽

Evenness Indices ◽

Aquatic Macrophyte Community ◽

The Relationship

The relationship between biodiversity and productivity (or biomass production) (BPR) has been a popular topic in macroecology and debated for decades. However, this relationship is poorly understood in macrophyte communities, and the mechanism of the BPR pattern of the aquatic macrophyte community is not clear. We investigated 78 aquatic macrophyte communities in a shallow mesotrophic freshwater lake in the middle and lower reaches of the Yangtze River in China. We analyzed the relationship between biodiversity (species richness, diversity, and evenness indices) and community biomass, and the effects of water environments and interspecific interactions on biodiversity–biomass patterns. Unimodal patterns between community biomass and diversity indices instead of evenness indices are shown, and these indicate the importance of both the number and abundance of species when studying biodiversity–biomass patterns under mesotrophic conditions. These patterns were moderated by species identity biologically and water depth environmentally. However, water depth determined the distribution and growth of species with different life-forms as well as species identities through environmental filtering. These results demonstrate that water depth regulates the biodiversity–biomass pattern of the aquatic macrophyte community as a result of its effect on species identity and species distribution. Our study may provide useful information for conservation and restoration of macrophyte vegetation in shallow lakes through matching water depth and species or life-form combinations properly to reach high ecosystem functions and services.

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Grassland reclamation of a copper mine tailings facility: Long term effects of biosolids on plant community responses

Applied Vegetation Science ◽

10.1111/avsc.12612 ◽

2021 ◽

Author(s):

Alyson Gagnon ◽

Laura W. Ploughe ◽

Michelle P. Harris ◽

Wendy C. Gardner ◽

Thomas Pypker ◽

...

Keyword(s):

Plant Community ◽

Mine Tailings ◽

Long Term Effects ◽

Community Responses ◽

Copper Mine ◽

Copper Mine Tailings

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Long‐ term effects of water quality on the freshwater bivalve Diplodon chilensis (Unionida: Hyriidae) caged at different sites in a North Patagonian river (Argentina)

Ecohydrology ◽

10.1002/eco.2181 ◽

2020 ◽

Vol 13 (2) ◽

Author(s):

María S. Yusseppone ◽

Viginia A. Bianchi ◽

Juan M. Castro ◽

Carlos M. Luquet ◽

Sebastián E. Sabatini ◽

...

Keyword(s):

Water Quality ◽

Long Term Effects ◽

Freshwater Bivalve

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Long-term experimental study of the aquatic plant system for polluted river water

Water Science & Technology ◽

10.2166/wst.2002.0741 ◽

2002 ◽

Vol 46 (11-12) ◽

pp. 217-224 ◽

Cited By ~ 6

Author(s):

K. Sato ◽

H. Sakui ◽

Y. Sakai ◽

S. Tanaka

Keyword(s):

Surface Area ◽

Aquatic Plant ◽

Aquatic Macrophyte ◽

Unit Surface Area ◽

Artificial Wetlands ◽

Polluted River ◽

Plant System ◽

Unit Surface ◽

Experimental Facilities

Water purification using artificial wetlands and aquatic macrophyte is attracting attention as a purification technology that can create rich ecosystems while imposing a minimal load on the environment. Because an aquatic plant system requires a large surface area, design specifications and maintenance methods that can obtain the optimum purification effect per unit surface area must be established. Large experimental facilities have been constructed beside a polluted river flowing into Lake Kasumigaura and have been used for a three-year experiment using several kinds of aquatic plants. This report summarizes the characteristics and the design load of the aquatic plant system based on this study and results from other aquatic plant facilities.

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