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Irene Gregory-eaves - One of the best experts on this subject based on the ideXlab platform.
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THE INFLUENCE OF SUBMERGED MacrophyteS ON SEDIMENTARY DIATOM ASSEMBLAGES1
Journal of phycology, 2011Co-Authors: Jesse C. Vermaire, Yves T. Prairie, Irene Gregory-eavesAbstract:Submerged Macrophytes are a central component of lake ecosystems; however, little is known regarding their long-term response to environmental change. We have examined the potential of diatoms as indicators of past Macrophyte biomass. We first sampled periphyton to determine whether habitat was a predictor of diatom assemblage. We then sampled 41 lakes in Quebec, Canada, to evaluate whether whole-lake submerged Macrophyte biomass (BiomEpiV) influenced surface sediment diatom assemblages. A multivariate regression tree (MRT) was used to construct a semiquantitative model to reconstruct past Macrophyte biomass. We determined that periphytic diatom assemblages on Macrophytes were significantly different from those on wood and rocks (ANOSIM R = 0.63, P
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Reconstructing changes in Macrophyte cover in lakes across the northeastern United States based on sedimentary diatom assemblages
Journal of Paleolimnology, 2008Co-Authors: Jesse C. Vermaire, Irene Gregory-eavesAbstract:Macrophytes are a critical component of lake ecosystems affecting nutrient and contaminant cycling, food web structure, and lake biodiversity. The long-term (decades to centuries) dynamics of Macrophyte cover are, however, poorly understood and no quantitative estimates exist for pre-industrial (pre-1850) Macrophyte cover in northeastern North America. Using a 215 lake dataset, we tested if surface sediment diatom assemblages significantly differed among lakes that have sparse (40% cover; group 3) Macrophyte cover. Analysis of similarity indicated that the diatom assemblages of these a priori groups of Macrophyte cover were significantly different from one another (i.e., difference between: groups 1 and 3, R statistic = 0.31, P
Zhengwen Liu - One of the best experts on this subject based on the ideXlab platform.
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a small omnivore fish acheilognathus macropterus reduces both growth and biomass of submerged Macrophytes implications for shallow lake restoration
Knowledge and Management of Aquatic Ecosystems, 2020Co-Authors: Baohua Guan, Zhengwen Liu, Manli Xia, Wei Zhen, Ruijie ShenAbstract:Transplantation of submerged Macrophytes has been widely used to improve water quality in restoring shallow lakes in China. However, in some lakes, small omnivorous fish predominated the fish assemblages and fed mainly on submerged Macrophytes. Despite significant research examining grazing selectivity in herbivorous fishes, Macrophyte feeding preferences of small omnivorous fishes are poorly understood. We conducted a mesocosm experiment to examine the effects of a prolific small omnivorous bitterling fish Acheilognathus macropterus on the relative growth rate (RGR) and biomass of submerged Macrophytes (Ceratophyllum demersum, Myriophyllum spicatum, Vallisneria denseserrulata, and Hydrilla verticillata ). Our results showed that the presence of A. macropterus significantly increased nutrient concentrations (e.g. total nitrogen and total phosphorus). The RGR of C. demersum in the bitterling-present treatment was significantly lower than the controls, in the presence of other Macrophyte species. Further, total biomass of the four species of Macrophytes in the fish-present mesocosms was markedly lower than in the fish-absent treatment, suggesting considerable consumption of Macrophytes by bitterling. Moreover, the percent biomass of V. denserrulata and H. verticillata were significantly enhanced by the presence of bitterling. Our findings suggest that A. macropterus may increase nutrient concentrations through excretion and reduce the biomass and RGR of certain submerged Macrophytes which may shift Macrophyte community structure via selective grazing.
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size dependent feeding of omnivorous nile tilapia in a Macrophyte dominated lake implications for lake management
Hydrobiologia, 2015Co-Authors: Weimin Rao, Erik Jeppesen, Jiajia Ning, Ping Zhong, Zhengwen LiuAbstract:Some species or size classes of omnivorous/herbivorous fish in (sub) tropical lakes feed on periphyton and phytoplankton, potentially promoting growth of Macrophytes via reduced shading. Others feed on Macrophytes, thereby enhancing the risk of having a turbid phytoplankton-dominated system in shallow lakes. Nile tilapia (Oreochromis niloticus), an abundant species in many warm lakes, feed on periphyton, phytoplankton, and Macrophytes depending on their size and may therefore have a size-dependent effect on lake ecosystems. We conducted a C–N stable isotope analysis on different size-classes of tilapia and their potential prey to determine their food sources in a tropical eutrophic shallow lake dominated by submerged Macrophytes. The shares of the dominant Macrophyte, Vallisneria natans, periphyton, and seston in the diet of fish averaged approx. 54, 26, and 20%, respectively. Large-bodied specimens fed mainly on Macrophytes, while small-bodied specimens were more dependent on periphyton, seston, or detritus. The results were confirmed by subsequent stomach analysis. We conclude that small-sized tilapia promote Macrophyte growth by removing periphyton and seston, whereas large-bodied individuals may restrict Macrophyte development. Selective removal of large-bodied tilapia might, therefore, stimulate the development of submerged Macrophytes and promote or maintain a clear water state in eutrophic shallow lakes with abundant tilapia.
Jesse C. Vermaire - One of the best experts on this subject based on the ideXlab platform.
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THE INFLUENCE OF SUBMERGED MacrophyteS ON SEDIMENTARY DIATOM ASSEMBLAGES1
Journal of phycology, 2011Co-Authors: Jesse C. Vermaire, Yves T. Prairie, Irene Gregory-eavesAbstract:Submerged Macrophytes are a central component of lake ecosystems; however, little is known regarding their long-term response to environmental change. We have examined the potential of diatoms as indicators of past Macrophyte biomass. We first sampled periphyton to determine whether habitat was a predictor of diatom assemblage. We then sampled 41 lakes in Quebec, Canada, to evaluate whether whole-lake submerged Macrophyte biomass (BiomEpiV) influenced surface sediment diatom assemblages. A multivariate regression tree (MRT) was used to construct a semiquantitative model to reconstruct past Macrophyte biomass. We determined that periphytic diatom assemblages on Macrophytes were significantly different from those on wood and rocks (ANOSIM R = 0.63, P
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Reconstructing changes in Macrophyte cover in lakes across the northeastern United States based on sedimentary diatom assemblages
Journal of Paleolimnology, 2008Co-Authors: Jesse C. Vermaire, Irene Gregory-eavesAbstract:Macrophytes are a critical component of lake ecosystems affecting nutrient and contaminant cycling, food web structure, and lake biodiversity. The long-term (decades to centuries) dynamics of Macrophyte cover are, however, poorly understood and no quantitative estimates exist for pre-industrial (pre-1850) Macrophyte cover in northeastern North America. Using a 215 lake dataset, we tested if surface sediment diatom assemblages significantly differed among lakes that have sparse (40% cover; group 3) Macrophyte cover. Analysis of similarity indicated that the diatom assemblages of these a priori groups of Macrophyte cover were significantly different from one another (i.e., difference between: groups 1 and 3, R statistic = 0.31, P
Steven Arthur Loiselle - One of the best experts on this subject based on the ideXlab platform.
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secondary impacts of eutrophication control activities in shallow lakes lessons from aquatic Macrophyte dynamics in lake taihu from 2000 to 2015
Freshwater Science, 2019Co-Authors: Yuchao Zhang, Qichun Liang, Baohua Guan, Steven Arthur LoiselleAbstract:AbstractAquatic Macrophytes in lakes and rivers are highly sensitive to changes in water quality and ecological conditions. Satellite remote sensing of aquatic Macrophyte distributions can map changes in freshwater ecosystem dynamics. However, Macrophyte mapping by remote sensing is challenging in lakes dominated by algal blooms or with high turbidity. In this study, we mapped the composition and distribution of emergent/floating and submerged Macrophytes in the large turbid and eutrophic Lake Taihu, China. We used a novel classification method and 16 y of MODIS images to map these data. The inter-annual trends in Macrophyte distribution and cover show complex dynamics in this heavily-managed lake. The area occupied by emergent/floating Macrophytes increased from 39.3 km2 in 2000 to 90.3 km2 in 2015 (a 230% increase), whereas the area dominated by submerged Macrophytes decreased from 404.6 km2 in 2001 to 167.5 km2 in 2015 (a 59% decrease). We also used the annual date of initial Macrophyte occurrence and ...
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secondary impacts of eutrophication control activities in shallow lakes lessons from aquatic Macrophyte dynamics in lake taihu from 2000 to 2015
Freshwater Science, 2019Co-Authors: Yuchao Zhang, Qichun Liang, Baohua Guan, Steven Arthur LoiselleAbstract:AbstractAquatic Macrophytes in lakes and rivers are highly sensitive to changes in water quality and ecological conditions. Satellite remote sensing of aquatic Macrophyte distributions can map chan...
Yuchao Zhang - One of the best experts on this subject based on the ideXlab platform.
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secondary impacts of eutrophication control activities in shallow lakes lessons from aquatic Macrophyte dynamics in lake taihu from 2000 to 2015
Freshwater Science, 2019Co-Authors: Yuchao Zhang, Qichun Liang, Baohua Guan, Steven Arthur LoiselleAbstract:AbstractAquatic Macrophytes in lakes and rivers are highly sensitive to changes in water quality and ecological conditions. Satellite remote sensing of aquatic Macrophyte distributions can map changes in freshwater ecosystem dynamics. However, Macrophyte mapping by remote sensing is challenging in lakes dominated by algal blooms or with high turbidity. In this study, we mapped the composition and distribution of emergent/floating and submerged Macrophytes in the large turbid and eutrophic Lake Taihu, China. We used a novel classification method and 16 y of MODIS images to map these data. The inter-annual trends in Macrophyte distribution and cover show complex dynamics in this heavily-managed lake. The area occupied by emergent/floating Macrophytes increased from 39.3 km2 in 2000 to 90.3 km2 in 2015 (a 230% increase), whereas the area dominated by submerged Macrophytes decreased from 404.6 km2 in 2001 to 167.5 km2 in 2015 (a 59% decrease). We also used the annual date of initial Macrophyte occurrence and ...
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secondary impacts of eutrophication control activities in shallow lakes lessons from aquatic Macrophyte dynamics in lake taihu from 2000 to 2015
Freshwater Science, 2019Co-Authors: Yuchao Zhang, Qichun Liang, Baohua Guan, Steven Arthur LoiselleAbstract:AbstractAquatic Macrophytes in lakes and rivers are highly sensitive to changes in water quality and ecological conditions. Satellite remote sensing of aquatic Macrophyte distributions can map chan...
