China lies at the heart of the global center of freshwater crab diversity in tropical Asia,where the 2 most diverse families occur:Potamidae(505 species,95 genera)and Gecarcinucidae(344 species,59 genera).China stands...China lies at the heart of the global center of freshwater crab diversity in tropical Asia,where the 2 most diverse families occur:Potamidae(505 species,95 genera)and Gecarcinucidae(344 species,59 genera).China stands out as the country with the highest species richness of freshwater crabs globally.Its fauna comprises 243 species in 37 genera and in 2 families,and species discovery is still progressing at a rapid pace.The vast majority of the species are distributed in southwest,south central and eastern China in the Oriental zoogeographical region.China also stands out as having a highly endemic freshwater crab fauna at the species level(96%)and at the genus level(78%).Although the recent International Union for the Conservation of Nature(IUCN)red list conservation assessment found only 6 out of 228 species(2%)to be threatened(5 potamids and 1 gecarcinucid),the majority(more than 75%)of Chinese species are regarded as data deficient,so the number of threatened species is likely to be a serious underestimate.Threats from increasing habitat destruction and pollution are a major concern due to the rapidly growing economy and massive developments taking place in China.There is therefore an urgent need for increased species exploration and for the development of a conservation strategy for China’s threatened(and potentially threatened)endemic freshwater crab species.展开更多
Phylogenetic relationships among Bornean sucker fishes(Teleostei:Balitoridae:Gastromyzontinae)were investigated by comparing cytochrome b gene sequences from eight species.The results were in general agreement with pr...Phylogenetic relationships among Bornean sucker fishes(Teleostei:Balitoridae:Gastromyzontinae)were investigated by comparing cytochrome b gene sequences from eight species.The results were in general agreement with previous morphology-based studies.It was found that the genera Gastromyzon and Neogastromyzon are both monophyletic and that the Chinese homalopterid Crossostoma lacustre(Homalopterinae)is not related to the Bornean species.This molecular-level study of cytochrome b gene variation in Bornean gastromyzontins will undoubtedly help to shed light on the molecular systematics of this unique freshwater fish.展开更多
基金Ellie Dyer,Emma Brooks,Monica Bohm,Nadia Dewhurst and Ben Collen from the Sampled Red List Index,Zoological Society of London,UK are thanked for their help with the conservation assessments and with earlier versions of the maps of Chinese freshwater crab distributions.Hsi-Te Shih,Department of Life Science,National Chung Hsing University is thanked for providing an updated list of the freshwater crabs of China.
文摘China lies at the heart of the global center of freshwater crab diversity in tropical Asia,where the 2 most diverse families occur:Potamidae(505 species,95 genera)and Gecarcinucidae(344 species,59 genera).China stands out as the country with the highest species richness of freshwater crabs globally.Its fauna comprises 243 species in 37 genera and in 2 families,and species discovery is still progressing at a rapid pace.The vast majority of the species are distributed in southwest,south central and eastern China in the Oriental zoogeographical region.China also stands out as having a highly endemic freshwater crab fauna at the species level(96%)and at the genus level(78%).Although the recent International Union for the Conservation of Nature(IUCN)red list conservation assessment found only 6 out of 228 species(2%)to be threatened(5 potamids and 1 gecarcinucid),the majority(more than 75%)of Chinese species are regarded as data deficient,so the number of threatened species is likely to be a serious underestimate.Threats from increasing habitat destruction and pollution are a major concern due to the rapidly growing economy and massive developments taking place in China.There is therefore an urgent need for increased species exploration and for the development of a conservation strategy for China’s threatened(and potentially threatened)endemic freshwater crab species.
文摘Phylogenetic relationships among Bornean sucker fishes(Teleostei:Balitoridae:Gastromyzontinae)were investigated by comparing cytochrome b gene sequences from eight species.The results were in general agreement with previous morphology-based studies.It was found that the genera Gastromyzon and Neogastromyzon are both monophyletic and that the Chinese homalopterid Crossostoma lacustre(Homalopterinae)is not related to the Bornean species.This molecular-level study of cytochrome b gene variation in Bornean gastromyzontins will undoubtedly help to shed light on the molecular systematics of this unique freshwater fish.
