We determined the effect of Chinese mitten crab（CMC） pen culture on the quantified spatial distribution of the macrozoobenthic community and sediment nutrients in Lake Yangcheng.Redundancy analysis indicated that wa...We determined the effect of Chinese mitten crab（CMC） pen culture on the quantified spatial distribution of the macrozoobenthic community and sediment nutrients in Lake Yangcheng.Redundancy analysis indicated that water temperature, macrophyte occurrence, sediment type, and crab culture were the main environmental factors that influence the spatiotemporal macrozoobenthic distribution. Macrozoobenthic assemblages in the lake were characterized by eutrophic indicator species. In the most polluted estuaries, the abundance and diversity indices of the whole community and abundance of chironomids and oligochaetes were significantly depressed, and sediment carbon（C） and phosphorus（P） were significantly enhanced compared with those in the western, middle（MB）, and eastern basin（EB）. Crab culture in this lake had significant effects on the species composition of the macrozoobenthic community in one of three CMC culture pens（CP）, and generally depressed the abundance of most chironomid and oligochaete species. Significantly increased diversity, evenness, sediment carbon and nitrogen content, and sediment C：P ratio in the CP were found compared with those in the three basins.However, no conspicuous difference in sediment P content between the CP and the two basins of MB and EB was detected. Our results showed that the enhanced diversity and evenness of macrozoobenthos might be associated with the joint effect of macrophyte planting and crab predation, and macrophyte planting may modify the effects of CMC culture by leading to disproportional accumulation of C and N in the sediment relative to P in the CP of the lake.展开更多
Core sediments from the Muthupettai mangroves on the southeast coast of India were analyzed for soil texture,total nitrogen,organic carbon,phosphorus and heavy metals(Fe,Mn,Cr,Cu,Ni,Pb,Zn and Cd).The distinct seasonal...Core sediments from the Muthupettai mangroves on the southeast coast of India were analyzed for soil texture,total nitrogen,organic carbon,phosphorus and heavy metals(Fe,Mn,Cr,Cu,Ni,Pb,Zn and Cd).The distinct seasonal variation in the distribution of metals in the sediments was observed.The minimum concentration was recorded in river mouth and the maximum was in lagoon.High metal concentration in sediment was observed during monsoon and low concentration in summer.The total nu-trient in lagoon and river mouth was recorded in the range of 4.528 to 8.526 mg g-1 for organic carbon,2.213 to 10.5 mg g-1 for nitro-gen and 0.824 to 7.22 mg g-1.展开更多
Mangroves show a biogenic response to adjust sea-level rise by accumulating sediment and carbon(vertical soil accretion),reshaping their structure and composition to minimize the effects.Additionally,the often-overloo...Mangroves show a biogenic response to adjust sea-level rise by accumulating sediment and carbon(vertical soil accretion),reshaping their structure and composition to minimize the effects.Additionally,the often-overlooked factors of soil nutrient availability,functional traits,and stand structure can alter the mangrove diversity-salinity-productivity link.However,how these multiple drivers interplay to maintain growth against salinity still needs to be better understood.Considering all these,we answered two questions:(QI)How do species diversity and structural heterogeneity modulate growth vs.salinity relationships?(QII)To what extent can structural heterogeneity and species diversity create optimal conditions by minimizing the adverse effects of salinity while concurrently maximizing forest growth?To comprehensively understand the interplay between structural and species diversity,nutrient availability,functional traits,and rising salinity,we examined a dataset from 60 permanent plots established in the Sundarbans mangrove forest in Bangladesh.Our results indicated that species diversity less directly contributed to forest growth than structural heterogeneity,nutrient availability(N,P,and K),and leaf area index.While forest structural and species diversity alone is unlikely to optimize growth,incorporating nutrients into the models showed a slight improvement in buffering against salinity.However,when nutrients were combined with the leaf area index,the models indicated a much stronger enhancement in the forest’s resilience to salinity through interactions with these factors,allowing continued growth.In conclusion,our study highlights the relative contributions of species and structural diversity to mangrove growth under stress and the potential roles of nutrients and functional traits.These findings are valuable for forest growth modelling,informing conservation and management strategies for mangroves,particularly in coastal plantations facing environmental changes.展开更多
基金supported by the Scientific Special Fund of Commonweal Industry (Agriculture) of Finance Ministry (No. nyhyzx07-045)Shanghai University Knowledge Service Platform, Shanghai Ocean University Aquatic Animal Breeding Center (ZF1206)
文摘We determined the effect of Chinese mitten crab（CMC） pen culture on the quantified spatial distribution of the macrozoobenthic community and sediment nutrients in Lake Yangcheng.Redundancy analysis indicated that water temperature, macrophyte occurrence, sediment type, and crab culture were the main environmental factors that influence the spatiotemporal macrozoobenthic distribution. Macrozoobenthic assemblages in the lake were characterized by eutrophic indicator species. In the most polluted estuaries, the abundance and diversity indices of the whole community and abundance of chironomids and oligochaetes were significantly depressed, and sediment carbon（C） and phosphorus（P） were significantly enhanced compared with those in the western, middle（MB）, and eastern basin（EB）. Crab culture in this lake had significant effects on the species composition of the macrozoobenthic community in one of three CMC culture pens（CP）, and generally depressed the abundance of most chironomid and oligochaete species. Significantly increased diversity, evenness, sediment carbon and nitrogen content, and sediment C：P ratio in the CP were found compared with those in the three basins.However, no conspicuous difference in sediment P content between the CP and the two basins of MB and EB was detected. Our results showed that the enhanced diversity and evenness of macrozoobenthos might be associated with the joint effect of macrophyte planting and crab predation, and macrophyte planting may modify the effects of CMC culture by leading to disproportional accumulation of C and N in the sediment relative to P in the CP of the lake.
文摘Core sediments from the Muthupettai mangroves on the southeast coast of India were analyzed for soil texture,total nitrogen,organic carbon,phosphorus and heavy metals(Fe,Mn,Cr,Cu,Ni,Pb,Zn and Cd).The distinct seasonal variation in the distribution of metals in the sediments was observed.The minimum concentration was recorded in river mouth and the maximum was in lagoon.High metal concentration in sediment was observed during monsoon and low concentration in summer.The total nu-trient in lagoon and river mouth was recorded in the range of 4.528 to 8.526 mg g-1 for organic carbon,2.213 to 10.5 mg g-1 for nitro-gen and 0.824 to 7.22 mg g-1.
基金funded by BANBEIS,Ministry of Education,Government of the People’s Republic of Bangladesh(Reference:LS2023-2382)the Grant-in-Aid for Scientific Research from Research and Innovation Centre,Khulna University,Khulna-9208,Bangladesh and SUST Research Centre(Project Id:FES/2021/1/02)Open Access funding enabled and organized by Projekt DEAL.
文摘Mangroves show a biogenic response to adjust sea-level rise by accumulating sediment and carbon(vertical soil accretion),reshaping their structure and composition to minimize the effects.Additionally,the often-overlooked factors of soil nutrient availability,functional traits,and stand structure can alter the mangrove diversity-salinity-productivity link.However,how these multiple drivers interplay to maintain growth against salinity still needs to be better understood.Considering all these,we answered two questions:(QI)How do species diversity and structural heterogeneity modulate growth vs.salinity relationships?(QII)To what extent can structural heterogeneity and species diversity create optimal conditions by minimizing the adverse effects of salinity while concurrently maximizing forest growth?To comprehensively understand the interplay between structural and species diversity,nutrient availability,functional traits,and rising salinity,we examined a dataset from 60 permanent plots established in the Sundarbans mangrove forest in Bangladesh.Our results indicated that species diversity less directly contributed to forest growth than structural heterogeneity,nutrient availability(N,P,and K),and leaf area index.While forest structural and species diversity alone is unlikely to optimize growth,incorporating nutrients into the models showed a slight improvement in buffering against salinity.However,when nutrients were combined with the leaf area index,the models indicated a much stronger enhancement in the forest’s resilience to salinity through interactions with these factors,allowing continued growth.In conclusion,our study highlights the relative contributions of species and structural diversity to mangrove growth under stress and the potential roles of nutrients and functional traits.These findings are valuable for forest growth modelling,informing conservation and management strategies for mangroves,particularly in coastal plantations facing environmental changes.
