Polychaetes are one of the most important groups ofmacrobenthic organisms in coastal and marine environments,in terms of diversity and abundance,and play an important role in the functioning of ecosystem.This study ai...Polychaetes are one of the most important groups ofmacrobenthic organisms in coastal and marine environments,in terms of diversity and abundance,and play an important role in the functioning of ecosystem.This study aims to describe the structure and spatial distribution ofpolychaete communities along Essaouira's rocky shoreline(Atlantic coast of Morocco)in relation to the major environmental variables such as granulometry,salinity,temperature,pH,and intertidal range.Twelve sites from these intertidal rocky shores were sampled using a quadrat method during the summer 2016.A total of 4435 individuals belonging to 34 taxa were recorded.Among the families,Sabellaridae(24%)and Nereididae(23%)were ranked first in terms of abundance of individuals.Sabellaria alveolata(24%)and Perinereis cultrifera(13%)were the dominant species.Diversity(H')values varied from 2.28 to 3.95.Pielou's index(J')varied between 0.62 and 0.89.This was essentially due to the low dominance of few species.Cluster analysis was used to characterise Essaouira's rocky shores on the basis of benthic polychaete communities.SIMPER analysis confirmed the presence of three distinct communities.According to canonical correspondence analysis,the structure and distribution of faunal assemblages of benthic polychaetes was mainly related to topographical complexity,water temperature,hydrodynamic conditions and upwelling.We conclude that these rocky shores show typically high benthic polychaete diversity compared to the taxonomic list of other rocky coasts.In addition,these results constitute a baseline data for the development of a sustainable network for long-term monitoring of benthic polychaete community changes due to ecological factor influences and anthropogenic activity impacts.展开更多
This report provides a result obtained by the First Chinese Antarctic and Southern Ocean Expedition. Specimens were collected by investigators of the Second Institute of Oceanography, SOA, with plankton nets in Februa...This report provides a result obtained by the First Chinese Antarctic and Southern Ocean Expedition. Specimens were collected by investigators of the Second Institute of Oceanography, SOA, with plankton nets in February and March of 1985 from the South Shetland Islands, the Biscoe Islands and their vicinities, between 61°15’20S-65°30’16S, 56°18’72W-67°59’45W. Eight species belonging to 5 genera in 4 families have been identified, of which 4 species, namely Maupasia coeca Viguier, Rhynchonerella petersii (Langerhans), Rhynchonerella bongraini (Gravier), and Tomopteris planktonis Apstein are recorded for the first time from the South Shetland Islands and 2 species, namely Rhynchonerella bongraini (Gravier), and Tomopteris carpenteri Quatrefages are endemic species of Antarctica.展开更多
During late February to mid-March, 1991, when mature N. japonica swarmed in the sea surface off Jimo County, Qingdao, seawater containing numerous early embryos was pumped into a nearby 2.7 ha. muddy-sand shrimp pond,...During late February to mid-March, 1991, when mature N. japonica swarmed in the sea surface off Jimo County, Qingdao, seawater containing numerous early embryos was pumped into a nearby 2.7 ha. muddy-sand shrimp pond, where the embryos continued to develop. 800000 Penaeus chinensis seedlings were introduced into the pond on May 30, 1991. Monthly benthic samplings were carried out to determine the population dynamics and production of N. japonica in this atypical environ -ment.The density of N. japonica varied from 0 to 20400 ind./m2. The predation of P. chinensis was considered to be responsible for the mass mortality of N. japonica in June through July, when the worms were 2.2-3.3cm in length and lived in the top 2-4cm sediment. From August to September of 1991, the hottest period in the site, there was no substantial mortality of N. japonica as reported in earlier literature. This was explained by the deeper burrowing of the’ worms that protected them from predation by shrimps.Monthly biomass ranged展开更多
The present study investigated the applicability of integrated polychaete-fish culture for fish waste removal to offset negative impact induced by organic benthic enrichment.A field study demonstrated that deposition ...The present study investigated the applicability of integrated polychaete-fish culture for fish waste removal to offset negative impact induced by organic benthic enrichment.A field study demonstrated that deposition rate was significantly higher underneath the fish farm than that in control area.The material settling under the farm was characterized by a high amount of fish feces(45%) and uneaten feed(27%).Both feeding rate(FR) and apparent digestibility rate(ADR) increased with decreasing body weight,as was indicated by significantly a higher rate observed for the groups containing smaller individuals in a lab study.The nutrient in fresh deposited material(De) was higher than that in sediments collected under the farm(Se),resulting in lower feces production but higher apparent digestibility rate for the De group as feeding rate was similar.Consequently,higher nutrient removal efficiency was observed in the De group.A mass balance approach indicated that approximately 400–500 individuals m^(-2) is required for removing all waste materials deposited underneath the fish farm,whereas abundance can be lower(about 300–350 individuals m^(-2)) when only the fish waste needs to be removed.The results showed that a significant amount of waste had been accumulated in the fish cages in Sanggou Bay.The integration of fish with P.aibuhitensis seems promising for preventing organic pollution in the sediment and therefore is an effective strategy for mitigating negative effect of fish farms.Thus such integration can become a new IMTA(integrated multi-trophic aquaculture) model in Sanggou Bay.展开更多
文摘Polychaetes are one of the most important groups ofmacrobenthic organisms in coastal and marine environments,in terms of diversity and abundance,and play an important role in the functioning of ecosystem.This study aims to describe the structure and spatial distribution ofpolychaete communities along Essaouira's rocky shoreline(Atlantic coast of Morocco)in relation to the major environmental variables such as granulometry,salinity,temperature,pH,and intertidal range.Twelve sites from these intertidal rocky shores were sampled using a quadrat method during the summer 2016.A total of 4435 individuals belonging to 34 taxa were recorded.Among the families,Sabellaridae(24%)and Nereididae(23%)were ranked first in terms of abundance of individuals.Sabellaria alveolata(24%)and Perinereis cultrifera(13%)were the dominant species.Diversity(H')values varied from 2.28 to 3.95.Pielou's index(J')varied between 0.62 and 0.89.This was essentially due to the low dominance of few species.Cluster analysis was used to characterise Essaouira's rocky shores on the basis of benthic polychaete communities.SIMPER analysis confirmed the presence of three distinct communities.According to canonical correspondence analysis,the structure and distribution of faunal assemblages of benthic polychaetes was mainly related to topographical complexity,water temperature,hydrodynamic conditions and upwelling.We conclude that these rocky shores show typically high benthic polychaete diversity compared to the taxonomic list of other rocky coasts.In addition,these results constitute a baseline data for the development of a sustainable network for long-term monitoring of benthic polychaete community changes due to ecological factor influences and anthropogenic activity impacts.
文摘This report provides a result obtained by the First Chinese Antarctic and Southern Ocean Expedition. Specimens were collected by investigators of the Second Institute of Oceanography, SOA, with plankton nets in February and March of 1985 from the South Shetland Islands, the Biscoe Islands and their vicinities, between 61°15’20S-65°30’16S, 56°18’72W-67°59’45W. Eight species belonging to 5 genera in 4 families have been identified, of which 4 species, namely Maupasia coeca Viguier, Rhynchonerella petersii (Langerhans), Rhynchonerella bongraini (Gravier), and Tomopteris planktonis Apstein are recorded for the first time from the South Shetland Islands and 2 species, namely Rhynchonerella bongraini (Gravier), and Tomopteris carpenteri Quatrefages are endemic species of Antarctica.
文摘During late February to mid-March, 1991, when mature N. japonica swarmed in the sea surface off Jimo County, Qingdao, seawater containing numerous early embryos was pumped into a nearby 2.7 ha. muddy-sand shrimp pond, where the embryos continued to develop. 800000 Penaeus chinensis seedlings were introduced into the pond on May 30, 1991. Monthly benthic samplings were carried out to determine the population dynamics and production of N. japonica in this atypical environ -ment.The density of N. japonica varied from 0 to 20400 ind./m2. The predation of P. chinensis was considered to be responsible for the mass mortality of N. japonica in June through July, when the worms were 2.2-3.3cm in length and lived in the top 2-4cm sediment. From August to September of 1991, the hottest period in the site, there was no substantial mortality of N. japonica as reported in earlier literature. This was explained by the deeper burrowing of the’ worms that protected them from predation by shrimps.Monthly biomass ranged
基金supported by Primary Research&Development Plan of Shandong Province(2016GGF01068)the National Natural Science Foundation of China(Nos.31302193,41676147)+3 种基金Environment and Aquaculture Governance(CHN-2152,13/0033)Public Funds of Key Laboratory of East China Sea&Oceanic Fishery Resources Exploitation and Utilization,Ministry of Agriculture,P.R.China(2013K06)the Special Scientific Research Funds for Central Non-profit Institutes,Yellow Sea Fisheries Research Institutes(20603022015017)National Natural Science Foundation of China 41306117)
文摘The present study investigated the applicability of integrated polychaete-fish culture for fish waste removal to offset negative impact induced by organic benthic enrichment.A field study demonstrated that deposition rate was significantly higher underneath the fish farm than that in control area.The material settling under the farm was characterized by a high amount of fish feces(45%) and uneaten feed(27%).Both feeding rate(FR) and apparent digestibility rate(ADR) increased with decreasing body weight,as was indicated by significantly a higher rate observed for the groups containing smaller individuals in a lab study.The nutrient in fresh deposited material(De) was higher than that in sediments collected under the farm(Se),resulting in lower feces production but higher apparent digestibility rate for the De group as feeding rate was similar.Consequently,higher nutrient removal efficiency was observed in the De group.A mass balance approach indicated that approximately 400–500 individuals m^(-2) is required for removing all waste materials deposited underneath the fish farm,whereas abundance can be lower(about 300–350 individuals m^(-2)) when only the fish waste needs to be removed.The results showed that a significant amount of waste had been accumulated in the fish cages in Sanggou Bay.The integration of fish with P.aibuhitensis seems promising for preventing organic pollution in the sediment and therefore is an effective strategy for mitigating negative effect of fish farms.Thus such integration can become a new IMTA(integrated multi-trophic aquaculture) model in Sanggou Bay.
