Unregulated commercial-scale exploitation of trees is an indication of the extent of threat to various tree species. The study examined the threat status of commercially exploited trees in the forest estates of South ...Unregulated commercial-scale exploitation of trees is an indication of the extent of threat to various tree species. The study examined the threat status of commercially exploited trees in the forest estates of South eastern Nigeria. Specifically, it identified tree species under threat, and categorized them into threat classes, as well as determined the rate at which exploited trees were slipping into extinction. The study utilized the IUCN’s threat categorization criteria, in determining the threat status of commercially exploited trees. This study combined both secondary and primary data sources generated through Forest Inventory records, Tree Felled Analysis records and Participatory Survey. Data such as population size and density of species, level of exploitation and threat sensitive social and ecological parameters were obtained and applied against the IUCN criteria. Twenty-eight (28) trees species representing Thirty-two percent (32%) of eighty-six (86) commercially exploited trees were identified as threatened, ranging from the Vulnerable to the Critically Endangered categories. The theory of small and declining population paradigms were found to be of relevance in explaining the processes. Nine tree species such as Triplochiton spp., Baillonella toxisperma, Pogaoleosa, Anopyxis spp. among others were considered to require urgent conservation attention. Recommendations are proposed to halt the process of decline in the biodiversity of exploited trees.展开更多
Global biodiversity loss and mass extinction of species have raised serious global concerns,especially in fragile ecosystems.Karst forest,a well-known fragile ecosystem,is served as a natural laboratory for biogeograp...Global biodiversity loss and mass extinction of species have raised serious global concerns,especially in fragile ecosystems.Karst forest,a well-known fragile ecosystem,is served as a natural laboratory for biogeographical,ecological,evolutionary,and taxonomic research.However,species richness and distribution patterns in karst forests largely remain unclear.Orchidaceae has been regarded as the“flagship”group of plant diversity.In this study,we use Wanfengshan Nature Reserve in southeast Yunnan,China,as a model to determine the conservation status of orchids in the karst forest by conducting systematic field surveys in the past three years from 2019 to 2022.In total,we identified 78 orchid species in 35 genera in Wanfengshan Nature Reserve.The dominant species were Bulbophyllum andersonii,Eria coronaria,Nervilia mackinnonii and Paphiopedilum micranthum.Multiple life forms were also observed,including epiphyte(14.29%),facultative epiphyte(18.18%),lithophyte(23.38%),and terrestrial(44.15%).Orchid species richness showed a bimodal pattern varied with altitude,the higher richness was recorded at 1,500-1,600 and 1,200-1,300 m,while the minimum was below 1,100 m.Each independent hill is rich in orchid species including‘endemic’species.A total of 25(33.8%)orchid species were considered threatened by the Redlist of Chinese Vascular Plants(Qin et al.,2017),including 3 CR species,5 EN species and 17 VU species.We call for more research addressing the mechanisms of ecological adaption,mycorrhizal interactions,and pollination of orchids in karst forests,and effective ways for recovery and conservation of orchids.展开更多
The first comprehensive evaluation of more than 10000 species in China based on the IUCN Red List Criteria and Regional Guidelines is complete.More than 100 experts have been involved in this evaluation,which covers a...The first comprehensive evaluation of more than 10000 species in China based on the IUCN Red List Criteria and Regional Guidelines is complete.More than 100 experts have been involved in this evaluation,which covers a wide range of species,including invertebrates,vertebrates,gymnosperms and angiosperms.The present paper summa-rizes the major conclusions of the project.The number of threatened species in China was found to be much high than previously expected.In the past,the estimated percentages of species in each phylum that were endangered was 2-30%.In this comprehensive evaluation,the percentages of threatened species were found to be 7.4-100%.Compared with the status of threatened species worldwide(IUCN Red List 2006),groups such as fish,mammals and gymno-sperms face much higher levels of threat in China then they do globally,and other groups,such as crustaceans,reptiles and birds,face lower levels of threat.Given the dire conclusions of this study,we recommend that more research be done on the threats faced by those groups of organisms that are most threatened.展开更多
目的:分析早期先兆流产患者安胎结局与甲状腺功能的相关性,初步探讨甲状腺功能状况对早期先兆流产患者安胎结局的影响,为早期干预甲状腺功能及用药提供数据支撑。方法:回顾性研究532例早期先兆流产患者,分为安胎成功组(402例)及安胎失败...目的:分析早期先兆流产患者安胎结局与甲状腺功能的相关性,初步探讨甲状腺功能状况对早期先兆流产患者安胎结局的影响,为早期干预甲状腺功能及用药提供数据支撑。方法:回顾性研究532例早期先兆流产患者,分为安胎成功组(402例)及安胎失败组(130例),通过测定甲状腺功能(TSH),和随访患者安胎结局,评估甲状腺功能状况与安胎结局的相关性。结果:安胎成功组共402例,105例正服用优甲乐,182例促甲状腺激素(TSH)<2.5 m IU/L,42例TSH 2.5~5 m IU/L,3例TSH≥10 m IU/L;安胎失败组共130例,28例正服用优甲乐,48例TSH<2.5 m IU/L,20例TSH2.5~5 m IU/L,4例TSH≥10 m IU/L。结论:随着促甲状腺激素(TSH)值升高,安胎成功率逐渐降低,安胎失败率逐渐上升;是否使用优甲乐对安胎结局无明显影响。展开更多
文摘Unregulated commercial-scale exploitation of trees is an indication of the extent of threat to various tree species. The study examined the threat status of commercially exploited trees in the forest estates of South eastern Nigeria. Specifically, it identified tree species under threat, and categorized them into threat classes, as well as determined the rate at which exploited trees were slipping into extinction. The study utilized the IUCN’s threat categorization criteria, in determining the threat status of commercially exploited trees. This study combined both secondary and primary data sources generated through Forest Inventory records, Tree Felled Analysis records and Participatory Survey. Data such as population size and density of species, level of exploitation and threat sensitive social and ecological parameters were obtained and applied against the IUCN criteria. Twenty-eight (28) trees species representing Thirty-two percent (32%) of eighty-six (86) commercially exploited trees were identified as threatened, ranging from the Vulnerable to the Critically Endangered categories. The theory of small and declining population paradigms were found to be of relevance in explaining the processes. Nine tree species such as Triplochiton spp., Baillonella toxisperma, Pogaoleosa, Anopyxis spp. among others were considered to require urgent conservation attention. Recommendations are proposed to halt the process of decline in the biodiversity of exploited trees.
基金supported by Doctoral Program of Yunnan Forestry Technological College(KY(ZD)201905)the Candidates of the Young and Middle Aged Academic Leaders of Yunnan Province[202305AC160024]Shenzhen Key Laboratory for Orchid Conservation and Utilization(OU202201)to Q.Liu.
文摘Global biodiversity loss and mass extinction of species have raised serious global concerns,especially in fragile ecosystems.Karst forest,a well-known fragile ecosystem,is served as a natural laboratory for biogeographical,ecological,evolutionary,and taxonomic research.However,species richness and distribution patterns in karst forests largely remain unclear.Orchidaceae has been regarded as the“flagship”group of plant diversity.In this study,we use Wanfengshan Nature Reserve in southeast Yunnan,China,as a model to determine the conservation status of orchids in the karst forest by conducting systematic field surveys in the past three years from 2019 to 2022.In total,we identified 78 orchid species in 35 genera in Wanfengshan Nature Reserve.The dominant species were Bulbophyllum andersonii,Eria coronaria,Nervilia mackinnonii and Paphiopedilum micranthum.Multiple life forms were also observed,including epiphyte(14.29%),facultative epiphyte(18.18%),lithophyte(23.38%),and terrestrial(44.15%).Orchid species richness showed a bimodal pattern varied with altitude,the higher richness was recorded at 1,500-1,600 and 1,200-1,300 m,while the minimum was below 1,100 m.Each independent hill is rich in orchid species including‘endemic’species.A total of 25(33.8%)orchid species were considered threatened by the Redlist of Chinese Vascular Plants(Qin et al.,2017),including 3 CR species,5 EN species and 17 VU species.We call for more research addressing the mechanisms of ecological adaption,mycorrhizal interactions,and pollination of orchids in karst forests,and effective ways for recovery and conservation of orchids.
文摘The first comprehensive evaluation of more than 10000 species in China based on the IUCN Red List Criteria and Regional Guidelines is complete.More than 100 experts have been involved in this evaluation,which covers a wide range of species,including invertebrates,vertebrates,gymnosperms and angiosperms.The present paper summa-rizes the major conclusions of the project.The number of threatened species in China was found to be much high than previously expected.In the past,the estimated percentages of species in each phylum that were endangered was 2-30%.In this comprehensive evaluation,the percentages of threatened species were found to be 7.4-100%.Compared with the status of threatened species worldwide(IUCN Red List 2006),groups such as fish,mammals and gymno-sperms face much higher levels of threat in China then they do globally,and other groups,such as crustaceans,reptiles and birds,face lower levels of threat.Given the dire conclusions of this study,we recommend that more research be done on the threats faced by those groups of organisms that are most threatened.
文摘目的:分析早期先兆流产患者安胎结局与甲状腺功能的相关性,初步探讨甲状腺功能状况对早期先兆流产患者安胎结局的影响,为早期干预甲状腺功能及用药提供数据支撑。方法:回顾性研究532例早期先兆流产患者,分为安胎成功组(402例)及安胎失败组(130例),通过测定甲状腺功能(TSH),和随访患者安胎结局,评估甲状腺功能状况与安胎结局的相关性。结果:安胎成功组共402例,105例正服用优甲乐,182例促甲状腺激素(TSH)<2.5 m IU/L,42例TSH 2.5~5 m IU/L,3例TSH≥10 m IU/L;安胎失败组共130例,28例正服用优甲乐,48例TSH<2.5 m IU/L,20例TSH2.5~5 m IU/L,4例TSH≥10 m IU/L。结论:随着促甲状腺激素(TSH)值升高,安胎成功率逐渐降低,安胎失败率逐渐上升;是否使用优甲乐对安胎结局无明显影响。
