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Laurence Volatier - One of the best experts on this subject based on the ideXlab platform.

  • influence of tubificid worms on sediment structure benthic biofilm and fauna in wetlands a field Enclosure Experiment
    Freshwater Biology, 2018
    Co-Authors: Florian Mermillodblondin, Morgane Bouvarot, Yann Déjollat, Jérôme Adrien, E. Maire, Damien Lemoine, Pierre Marmonier, Laurence Volatier
    Abstract:

    1. Bioturbation activities of tubificid worms play a major role in nutrient cycling and microbial processes occurring at water–sediment interfaces of freshwater environments. Nevertheless, evidence of significant contributions of worms to ecosystem functioning largely arises from Experiments performed at laboratory scales, because studies exploring the role of tubificid worms in the field are scarce. Therefore, this study aimed to test the influence of tubificid worms on benthic habitat structure and functioning in field Experiments. According to literature, we predicted that feeding activities of tubificid worms would increase the percentage of clay and silt particles, the bacterial growth and microbial activities in the top sediment layer. 2. The Experiment was performed at the water–sediment interface of a shallow wetland. Enclosures with and without addition of the tubificid worm Limnodrilus hoffmeisteri were used to quantify the influences of tubificid worms on the sedimentary habitat (sediment grain size distribution, water‐filled porosity using microtomography), the biofilm (algal biomass, bacterial abundance, total organic carbon and total nitrogen, microbial enzymatic activity, photosynthetic activity and efficiency of the photosystem II) and the benthic fauna. Measures were performed before worm addition and at the end of the Experiment. 3. After 6 weeks, the proportion of fine sediment particles (<63 μm) and the water‐filled porosity were significantly modified by the bioturbation activities of tubificid worms. The bacterial abundance was stimulated by twofold, the microbial hydrolytic activity by +35% and the algal biomass by +40%. The field Enclosures with and without L. hoffmeisteri showed differences in benthic invertebrate assemblages, especially for nematodes that were excluded from Enclosures with worms. 4. Our results indicate that bioturbation mechanisms and impacts reported from laboratory Experiments with tubificid worms are not only significant at a field scale, but also highlight unpredicted interactions with other benthic organisms (autotrophic compartment of the biofilm and invertebrates).

  • Influence of tubificid worms on sediment structure, benthic biofilm and fauna in wetlands: A field Enclosure Experiment
    Freshwater Biology, 2018
    Co-Authors: Florian Mermillod-blondin, Morgane Bouvarot, Yann Déjollat, Jérôme Adrien, E. Maire, Damien Lemoine, Pierre Marmonier, Laurence Volatier
    Abstract:

    1. Bioturbation activities of tubificid worms play a major role in nutrient cycling and microbial processes occurring at water–sediment interfaces of freshwater environments. Nevertheless, evidence of significant contributions of worms to ecosystem functioning largely arises from Experiments performed at laboratory scales, because studies exploring the role of tubificid worms in the field are scarce. Therefore, this study aimed to test the influence of tubificid worms on benthic habitat structure and functioning in field Experiments. According to literature, we predicted that feeding activities of tubificid worms would increase the percentage of clay and silt particles, the bacterial growth and microbial activities in the top sediment layer.2. The Experiment was performed at the water–sediment interface of a shallow wetland. Enclosures with and without addition of the tubificid worm Limnodrilus hoffmeisteri were used to quantify the influences of tubificid worms on the sedimentary habitat (sediment grain size distribution, water‐filled porosity using microtomography), the biofilm (algal biomass, bacterial abundance, total organic carbon and total nitrogen, microbial enzymatic activity, photosynthetic activity and efficiency of the photosystem II) and the benthic fauna. Measures were performed before worm addition and at the end of the Experiment.3. After 6 weeks, the proportion of fine sediment particles (

Wuchang Zhang - One of the best experts on this subject based on the ideXlab platform.

  • the effects of zhikong scallop chlamys farreri on the microbial food web in a phosphorus deficient mariculture system in sanggou bay china
    Aquaculture, 2015
    Co-Authors: Lingfeng Huang, Tian Xiao, Zengjie Jiang, Wuchang Zhang
    Abstract:

    Sanggou Bay is a phosphorus (P)-deficient and nitrogen-sufficient mariculture area, and the culture of the Zhikong scallop, Chlamys farreri, is important there. We established a 7-day Enclosure Experiment in situ to simulate the effects of the Zhikong scallop on the microbial food web in the bay. The results showed that scallop cultivation increased the concentration of PO43-(from 0.04 mu M at the initial to 0.26 mu M at the end of the Enclosure Experiment) and the abundance of picoplankton (heterotrophic bacteria, Synechococcus and picoeukaryotes), total nanoflagellates and ciliates. Following the Enclosure Experiment, the 6-day P-enrichment (similar to 0.3 mu M) and 3-hour feeding Experiments were conducted in field to study why scallop cultivation strengthened the microbial food web. The results showed that P-enrichment stimulated the growth of major microbial components when their predators were removed or suffered grazing pressure. The scallops did not efficiently retain picoplankton. The retention efficiency of the Zhikong scallop dropped with decreasing prey size, and the retention efficiencies for ciliates, 5-10 mu m nanoflagellates and <5 mu m nanoflagellates were 83.22%, 63.27% and 22.62%, respectively. It was suggested that P release by scallops may increase the abundance of main assemblages in the microbial food web, but the influence of the nutrient release into natural water may be partially diminished by trophic cascades within the microbial food web. However, the different retention efficiencies of the scallop on the different components of the microbial food web may weaken the strength of trophic cascades.

  • The effects of Zhikong scallop (Chlamys farreri) on the microbial food web in a phosphorus-deficient mariculture system in Sanggou Bay, China
    Aquaculture, 2015
    Co-Authors: Lingfeng Huang, Tian Xiao, Zengjie Jiang, Wuchang Zhang
    Abstract:

    Sanggou Bay is a phosphorus (P)-deficient and nitrogen-sufficient mariculture area, and the culture of the Zhikong scallop, Chlamys farreri, is important there. We established a 7-day Enclosure Experiment in situ to simulate the effects of the Zhikong scallop on the microbial food web in the bay. The results showed that scallop cultivation increased the concentration of PO43-(from 0.04 mu M at the initial to 0.26 mu M at the end of the Enclosure Experiment) and the abundance of picoplankton (heterotrophic bacteria, Synechococcus and picoeukaryotes), total nanoflagellates and ciliates. Following the Enclosure Experiment, the 6-day P-enrichment (similar to 0.3 mu M) and 3-hour feeding Experiments were conducted in field to study why scallop cultivation strengthened the microbial food web. The results showed that P-enrichment stimulated the growth of major microbial components when their predators were removed or suffered grazing pressure. The scallops did not efficiently retain picoplankton. The retention efficiency of the Zhikong scallop dropped with decreasing prey size, and the retention efficiencies for ciliates, 5-10 mu m nanoflagellates and

Lingfeng Huang - One of the best experts on this subject based on the ideXlab platform.

  • the effects of zhikong scallop chlamys farreri on the microbial food web in a phosphorus deficient mariculture system in sanggou bay china
    Aquaculture, 2015
    Co-Authors: Lingfeng Huang, Tian Xiao, Zengjie Jiang, Wuchang Zhang
    Abstract:

    Sanggou Bay is a phosphorus (P)-deficient and nitrogen-sufficient mariculture area, and the culture of the Zhikong scallop, Chlamys farreri, is important there. We established a 7-day Enclosure Experiment in situ to simulate the effects of the Zhikong scallop on the microbial food web in the bay. The results showed that scallop cultivation increased the concentration of PO43-(from 0.04 mu M at the initial to 0.26 mu M at the end of the Enclosure Experiment) and the abundance of picoplankton (heterotrophic bacteria, Synechococcus and picoeukaryotes), total nanoflagellates and ciliates. Following the Enclosure Experiment, the 6-day P-enrichment (similar to 0.3 mu M) and 3-hour feeding Experiments were conducted in field to study why scallop cultivation strengthened the microbial food web. The results showed that P-enrichment stimulated the growth of major microbial components when their predators were removed or suffered grazing pressure. The scallops did not efficiently retain picoplankton. The retention efficiency of the Zhikong scallop dropped with decreasing prey size, and the retention efficiencies for ciliates, 5-10 mu m nanoflagellates and <5 mu m nanoflagellates were 83.22%, 63.27% and 22.62%, respectively. It was suggested that P release by scallops may increase the abundance of main assemblages in the microbial food web, but the influence of the nutrient release into natural water may be partially diminished by trophic cascades within the microbial food web. However, the different retention efficiencies of the scallop on the different components of the microbial food web may weaken the strength of trophic cascades.

  • The effects of Zhikong scallop (Chlamys farreri) on the microbial food web in a phosphorus-deficient mariculture system in Sanggou Bay, China
    Aquaculture, 2015
    Co-Authors: Lingfeng Huang, Tian Xiao, Zengjie Jiang, Wuchang Zhang
    Abstract:

    Sanggou Bay is a phosphorus (P)-deficient and nitrogen-sufficient mariculture area, and the culture of the Zhikong scallop, Chlamys farreri, is important there. We established a 7-day Enclosure Experiment in situ to simulate the effects of the Zhikong scallop on the microbial food web in the bay. The results showed that scallop cultivation increased the concentration of PO43-(from 0.04 mu M at the initial to 0.26 mu M at the end of the Enclosure Experiment) and the abundance of picoplankton (heterotrophic bacteria, Synechococcus and picoeukaryotes), total nanoflagellates and ciliates. Following the Enclosure Experiment, the 6-day P-enrichment (similar to 0.3 mu M) and 3-hour feeding Experiments were conducted in field to study why scallop cultivation strengthened the microbial food web. The results showed that P-enrichment stimulated the growth of major microbial components when their predators were removed or suffered grazing pressure. The scallops did not efficiently retain picoplankton. The retention efficiency of the Zhikong scallop dropped with decreasing prey size, and the retention efficiencies for ciliates, 5-10 mu m nanoflagellates and

Morgane Bouvarot - One of the best experts on this subject based on the ideXlab platform.

  • influence of tubificid worms on sediment structure benthic biofilm and fauna in wetlands a field Enclosure Experiment
    Freshwater Biology, 2018
    Co-Authors: Florian Mermillodblondin, Morgane Bouvarot, Yann Déjollat, Jérôme Adrien, E. Maire, Damien Lemoine, Pierre Marmonier, Laurence Volatier
    Abstract:

    1. Bioturbation activities of tubificid worms play a major role in nutrient cycling and microbial processes occurring at water–sediment interfaces of freshwater environments. Nevertheless, evidence of significant contributions of worms to ecosystem functioning largely arises from Experiments performed at laboratory scales, because studies exploring the role of tubificid worms in the field are scarce. Therefore, this study aimed to test the influence of tubificid worms on benthic habitat structure and functioning in field Experiments. According to literature, we predicted that feeding activities of tubificid worms would increase the percentage of clay and silt particles, the bacterial growth and microbial activities in the top sediment layer. 2. The Experiment was performed at the water–sediment interface of a shallow wetland. Enclosures with and without addition of the tubificid worm Limnodrilus hoffmeisteri were used to quantify the influences of tubificid worms on the sedimentary habitat (sediment grain size distribution, water‐filled porosity using microtomography), the biofilm (algal biomass, bacterial abundance, total organic carbon and total nitrogen, microbial enzymatic activity, photosynthetic activity and efficiency of the photosystem II) and the benthic fauna. Measures were performed before worm addition and at the end of the Experiment. 3. After 6 weeks, the proportion of fine sediment particles (<63 μm) and the water‐filled porosity were significantly modified by the bioturbation activities of tubificid worms. The bacterial abundance was stimulated by twofold, the microbial hydrolytic activity by +35% and the algal biomass by +40%. The field Enclosures with and without L. hoffmeisteri showed differences in benthic invertebrate assemblages, especially for nematodes that were excluded from Enclosures with worms. 4. Our results indicate that bioturbation mechanisms and impacts reported from laboratory Experiments with tubificid worms are not only significant at a field scale, but also highlight unpredicted interactions with other benthic organisms (autotrophic compartment of the biofilm and invertebrates).

  • Influence of tubificid worms on sediment structure, benthic biofilm and fauna in wetlands: A field Enclosure Experiment
    Freshwater Biology, 2018
    Co-Authors: Florian Mermillod-blondin, Morgane Bouvarot, Yann Déjollat, Jérôme Adrien, E. Maire, Damien Lemoine, Pierre Marmonier, Laurence Volatier
    Abstract:

    1. Bioturbation activities of tubificid worms play a major role in nutrient cycling and microbial processes occurring at water–sediment interfaces of freshwater environments. Nevertheless, evidence of significant contributions of worms to ecosystem functioning largely arises from Experiments performed at laboratory scales, because studies exploring the role of tubificid worms in the field are scarce. Therefore, this study aimed to test the influence of tubificid worms on benthic habitat structure and functioning in field Experiments. According to literature, we predicted that feeding activities of tubificid worms would increase the percentage of clay and silt particles, the bacterial growth and microbial activities in the top sediment layer.2. The Experiment was performed at the water–sediment interface of a shallow wetland. Enclosures with and without addition of the tubificid worm Limnodrilus hoffmeisteri were used to quantify the influences of tubificid worms on the sedimentary habitat (sediment grain size distribution, water‐filled porosity using microtomography), the biofilm (algal biomass, bacterial abundance, total organic carbon and total nitrogen, microbial enzymatic activity, photosynthetic activity and efficiency of the photosystem II) and the benthic fauna. Measures were performed before worm addition and at the end of the Experiment.3. After 6 weeks, the proportion of fine sediment particles (

Pierre Marmonier - One of the best experts on this subject based on the ideXlab platform.

  • influence of tubificid worms on sediment structure benthic biofilm and fauna in wetlands a field Enclosure Experiment
    Freshwater Biology, 2018
    Co-Authors: Florian Mermillodblondin, Morgane Bouvarot, Yann Déjollat, Jérôme Adrien, E. Maire, Damien Lemoine, Pierre Marmonier, Laurence Volatier
    Abstract:

    1. Bioturbation activities of tubificid worms play a major role in nutrient cycling and microbial processes occurring at water–sediment interfaces of freshwater environments. Nevertheless, evidence of significant contributions of worms to ecosystem functioning largely arises from Experiments performed at laboratory scales, because studies exploring the role of tubificid worms in the field are scarce. Therefore, this study aimed to test the influence of tubificid worms on benthic habitat structure and functioning in field Experiments. According to literature, we predicted that feeding activities of tubificid worms would increase the percentage of clay and silt particles, the bacterial growth and microbial activities in the top sediment layer. 2. The Experiment was performed at the water–sediment interface of a shallow wetland. Enclosures with and without addition of the tubificid worm Limnodrilus hoffmeisteri were used to quantify the influences of tubificid worms on the sedimentary habitat (sediment grain size distribution, water‐filled porosity using microtomography), the biofilm (algal biomass, bacterial abundance, total organic carbon and total nitrogen, microbial enzymatic activity, photosynthetic activity and efficiency of the photosystem II) and the benthic fauna. Measures were performed before worm addition and at the end of the Experiment. 3. After 6 weeks, the proportion of fine sediment particles (<63 μm) and the water‐filled porosity were significantly modified by the bioturbation activities of tubificid worms. The bacterial abundance was stimulated by twofold, the microbial hydrolytic activity by +35% and the algal biomass by +40%. The field Enclosures with and without L. hoffmeisteri showed differences in benthic invertebrate assemblages, especially for nematodes that were excluded from Enclosures with worms. 4. Our results indicate that bioturbation mechanisms and impacts reported from laboratory Experiments with tubificid worms are not only significant at a field scale, but also highlight unpredicted interactions with other benthic organisms (autotrophic compartment of the biofilm and invertebrates).

  • Influence of tubificid worms on sediment structure, benthic biofilm and fauna in wetlands: A field Enclosure Experiment
    Freshwater Biology, 2018
    Co-Authors: Florian Mermillod-blondin, Morgane Bouvarot, Yann Déjollat, Jérôme Adrien, E. Maire, Damien Lemoine, Pierre Marmonier, Laurence Volatier
    Abstract:

    1. Bioturbation activities of tubificid worms play a major role in nutrient cycling and microbial processes occurring at water–sediment interfaces of freshwater environments. Nevertheless, evidence of significant contributions of worms to ecosystem functioning largely arises from Experiments performed at laboratory scales, because studies exploring the role of tubificid worms in the field are scarce. Therefore, this study aimed to test the influence of tubificid worms on benthic habitat structure and functioning in field Experiments. According to literature, we predicted that feeding activities of tubificid worms would increase the percentage of clay and silt particles, the bacterial growth and microbial activities in the top sediment layer.2. The Experiment was performed at the water–sediment interface of a shallow wetland. Enclosures with and without addition of the tubificid worm Limnodrilus hoffmeisteri were used to quantify the influences of tubificid worms on the sedimentary habitat (sediment grain size distribution, water‐filled porosity using microtomography), the biofilm (algal biomass, bacterial abundance, total organic carbon and total nitrogen, microbial enzymatic activity, photosynthetic activity and efficiency of the photosystem II) and the benthic fauna. Measures were performed before worm addition and at the end of the Experiment.3. After 6 weeks, the proportion of fine sediment particles (