The blue swimming crab,Portunus pelagicus(Linnaeus,1758),is one of the most economically important crustaceans in Thailand.In order to gather more in-country data on its biological aspects,a comprehensive observation ...The blue swimming crab,Portunus pelagicus(Linnaeus,1758),is one of the most economically important crustaceans in Thailand.In order to gather more in-country data on its biological aspects,a comprehensive observation of the annual reproductive cycle of female P.pelagicus,which were gathered each month from Kung Krabaen Bay,Thailand,from October 2017 to September 2018 was undertaken.The ovarian structure,gonadosomatic index(GSI)and histological description of P.pelagicus were observed during this time.It was revealed that six distinct stages—I(immature stage),II(early maturing stage),III(late maturing stage),IV(early matured stage),V(middle matured stage)and VI(late matured stage)—occur during the annual reproductive cycle of the females.Moreover,the percentage of the oogenic proportion of P.pelagicus appeared continuously throughout the year.The ovarian development was exclusively found in stage VI,during October 2017 to December 2017,with the highest peak in November 2017(39.96%)in relation to the high GSI.From October 2017 to February 2018,stage I was also observed,especially during October 2017(49.5%),implying its important involvement in supporting oogenic production.It would be suggested that the successive spawning season of the P.pelagicus population clearly occurred during October-December each year.Therefore,this would be the best time to support hatchery seed production,during which P.pelagicus collection should be avoided.展开更多
Background:A green roof is a man-made ecosystem created when a rooftop is covered with substrate and vegetation.Although green roof ecosystems(GREs)are able to provide ecosystem services,there is currently no assessme...Background:A green roof is a man-made ecosystem created when a rooftop is covered with substrate and vegetation.Although green roof ecosystems(GREs)are able to provide ecosystem services,there is currently no assessment tool available to specifically evaluate this.Therefore,the aim of this study was to develop a rapid assessment checklist(RAC)to assess GRE services(GRES),which was developed and tested on 10 green roofs in Bangkok,Thailand.Results:The RAC consisted of 46 proxy indicators(33 qualitative and 13 quantitative indicators)encompassing various aspects of GRESs.The GRES values or scores varied according to structural differences in the green roofs.The average score(from a maximum of 100)of total ecosystem services was 61±7,which could be inferred as a good performance in ecosystem service provision.The highest scores were obtained from the regulating services at 68±7.The lowest average score was 53±11 from the provisioning services.Conclusions:The RAC was able to evaluate the levels of GRES provided by the selected green roofs,enabling the meaningful comparison of their potential capability to provide GRES.Therefore,this RAC could be an innovative tool for evaluation of four categories of GRES.展开更多
文摘The blue swimming crab,Portunus pelagicus(Linnaeus,1758),is one of the most economically important crustaceans in Thailand.In order to gather more in-country data on its biological aspects,a comprehensive observation of the annual reproductive cycle of female P.pelagicus,which were gathered each month from Kung Krabaen Bay,Thailand,from October 2017 to September 2018 was undertaken.The ovarian structure,gonadosomatic index(GSI)and histological description of P.pelagicus were observed during this time.It was revealed that six distinct stages—I(immature stage),II(early maturing stage),III(late maturing stage),IV(early matured stage),V(middle matured stage)and VI(late matured stage)—occur during the annual reproductive cycle of the females.Moreover,the percentage of the oogenic proportion of P.pelagicus appeared continuously throughout the year.The ovarian development was exclusively found in stage VI,during October 2017 to December 2017,with the highest peak in November 2017(39.96%)in relation to the high GSI.From October 2017 to February 2018,stage I was also observed,especially during October 2017(49.5%),implying its important involvement in supporting oogenic production.It would be suggested that the successive spawning season of the P.pelagicus population clearly occurred during October-December each year.Therefore,this would be the best time to support hatchery seed production,during which P.pelagicus collection should be avoided.
基金This research was supported by the 90th Anniversary of Chulalongkorn University,Rachadapisek Sompote Fund(GCUGR1125603028D No.25)RP was financially supported by the Development and Promotion of Science and Technology Talents Scholarship.
文摘Background:A green roof is a man-made ecosystem created when a rooftop is covered with substrate and vegetation.Although green roof ecosystems(GREs)are able to provide ecosystem services,there is currently no assessment tool available to specifically evaluate this.Therefore,the aim of this study was to develop a rapid assessment checklist(RAC)to assess GRE services(GRES),which was developed and tested on 10 green roofs in Bangkok,Thailand.Results:The RAC consisted of 46 proxy indicators(33 qualitative and 13 quantitative indicators)encompassing various aspects of GRESs.The GRES values or scores varied according to structural differences in the green roofs.The average score(from a maximum of 100)of total ecosystem services was 61±7,which could be inferred as a good performance in ecosystem service provision.The highest scores were obtained from the regulating services at 68±7.The lowest average score was 53±11 from the provisioning services.Conclusions:The RAC was able to evaluate the levels of GRES provided by the selected green roofs,enabling the meaningful comparison of their potential capability to provide GRES.Therefore,this RAC could be an innovative tool for evaluation of four categories of GRES.
