Wuliangsuhai wetland is one of the representative wetlands in arid-semiarid region. It is also a key breeding site as well as a stepping site for both East Asia-Australasia Flyway and Central Asia Flyway. From 2009 to...Wuliangsuhai wetland is one of the representative wetlands in arid-semiarid region. It is also a key breeding site as well as a stepping site for both East Asia-Australasia Flyway and Central Asia Flyway. From 2009 to 2012, surveys on migratory water birds and their habitat were carried out by using transects census and spot count methods. The surveys recorded more than 100 000 water birds, and 98 species were identified, which belong to 6 orders and 14 families. Among the 98 species, 55 are summer residents （breeding here） and 39 are travelers （only stay here shortly）, which account for 56.12% and 39.80% of the total recorded bird species respectively. Further analysis on their migration pattern shows that spring migration is mainly from early March to mid May, which is shorter than autumn migration season （from early August to mid November）. Most of the summer residents breed from early April to late May. High concentration of key protected species were observed from early April to early May and from early September to early November. The bird community structure is relatively stable in summer, but much more dynamic during the migration seasons （spring and autumn）. Based on the study, recommendation to nominate Wuliangsuhai wetlands as Ramsar site, and flyway network site were put forward. Habitat management that address to the environmental determinants on bird distribution was also discussed.展开更多
Background:The aim of the study was to explore the ecological diversity of wild birds in Siberia, which are the natural reservoir of avian influenza virus(AIV).Methods:Cloacal swabs and intestinal fragments were colle...Background:The aim of the study was to explore the ecological diversity of wild birds in Siberia, which are the natural reservoir of avian influenza virus(AIV).Methods:Cloacal swabs and intestinal fragments were collected from wild migratory birds from 2007-2014. Isolated viruses were grown in the allantoic cavity of embryonated chicken eggs. The presence of virus was determined using hemagglutination assays. Primary identification and subtyping of influenza viruses was confirmed by RT-PCR.Results:A total of 2300 samples obtained from wild migratory birds of 8 orders were collected and tested. Influenza was detected in 185 birds of 3 orders. Species of family Anatidae(order Anseriformes) such as European Teal(Anas crecca), Garganey Teal(A. querquedula), and Shoveler(A. clypeata) play the main role in AIV circulation in the south of Western Siberia. The proportion of viral carriers among waterfowl ranged from 5.6 to 20% in 2007-2014. The order Charadriiformes had lower virus isolation rates of not more than 1.4%.Conclusions:Wild migratory waterfowl of orders Anseriformes and Charadriiformes are the main reservoir of AIV in the south of Western Siberia. This area plays a key role in persistence, evolution, and geographical distribution of avian influenza.展开更多
基金National Science and Technology Support Program (2008BADB0B02)
文摘Wuliangsuhai wetland is one of the representative wetlands in arid-semiarid region. It is also a key breeding site as well as a stepping site for both East Asia-Australasia Flyway and Central Asia Flyway. From 2009 to 2012, surveys on migratory water birds and their habitat were carried out by using transects census and spot count methods. The surveys recorded more than 100 000 water birds, and 98 species were identified, which belong to 6 orders and 14 families. Among the 98 species, 55 are summer residents （breeding here） and 39 are travelers （only stay here shortly）, which account for 56.12% and 39.80% of the total recorded bird species respectively. Further analysis on their migration pattern shows that spring migration is mainly from early March to mid May, which is shorter than autumn migration season （from early August to mid November）. Most of the summer residents breed from early April to late May. High concentration of key protected species were observed from early April to early May and from early September to early November. The bird community structure is relatively stable in summer, but much more dynamic during the migration seasons （spring and autumn）. Based on the study, recommendation to nominate Wuliangsuhai wetlands as Ramsar site, and flyway network site were put forward. Habitat management that address to the environmental determinants on bird distribution was also discussed.
文摘Background:The aim of the study was to explore the ecological diversity of wild birds in Siberia, which are the natural reservoir of avian influenza virus(AIV).Methods:Cloacal swabs and intestinal fragments were collected from wild migratory birds from 2007-2014. Isolated viruses were grown in the allantoic cavity of embryonated chicken eggs. The presence of virus was determined using hemagglutination assays. Primary identification and subtyping of influenza viruses was confirmed by RT-PCR.Results:A total of 2300 samples obtained from wild migratory birds of 8 orders were collected and tested. Influenza was detected in 185 birds of 3 orders. Species of family Anatidae(order Anseriformes) such as European Teal(Anas crecca), Garganey Teal(A. querquedula), and Shoveler(A. clypeata) play the main role in AIV circulation in the south of Western Siberia. The proportion of viral carriers among waterfowl ranged from 5.6 to 20% in 2007-2014. The order Charadriiformes had lower virus isolation rates of not more than 1.4%.Conclusions:Wild migratory waterfowl of orders Anseriformes and Charadriiformes are the main reservoir of AIV in the south of Western Siberia. This area plays a key role in persistence, evolution, and geographical distribution of avian influenza.
