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Articles by YU Hong-zhong
Total Records ( 2 ) for YU Hong-zhong
  LIU Qiang , YANG Xiao-jun , ZHU Jian-guo , ZHAO Jian-lin and YU Hong-zhong
  From October 2004 to May 2005, flock size and composition of wintering black-necked cranes (Grus nigricollis) were studied using spot scanning technique at Napahai Nature Reserve in Yunnan province. At night, the mean wintering population size was 67.9 (16-157, n=17). Composed by common crane (Grus grus) or not, roost cranes were divided into sing-species flock and mixed-species flock. The numbers of crane in sing-species flock were 65.3% of total black-necked cranes. In the day, feeding flocks were classified into three types: family group comprised of breeding pair and their offspring ranging between two to four; sub-adult flock composed mainly by sub-adults ranging between three to 65 with an average size of 16.1(n=1017); special flock composed by single cranes. Black-necked crane flocks were affected by season, temperature, breeding status, food abundance and availability, and their sizes changed significantly in daytime or between different months (P=0.000<0.05). After family breakup happened in late March, Juveniles were drove away by their parents and then they got together to join the sub-adult flocks.
  WANG Kai , YANG Xiao-jun , ZHAO Jian-lin , YU Hong-zhong and MIN Long
  From October 2006 to May 2007, daily activity patterns and the relationship between time budget and age, wintering stage, flocking behavior of Black-necked Cranes were studied at Napa Lake Nature Reserve, Shangri-La of Yunnan Province. We compartmentalized the winter season into three stages based on the amount of change the Black-necked Crane habited on Napa Lake Nature Reserve. The statistics from test results show significant differences among different stages in foraging, vigilance, preening, resting, locomotion, aggression, and flying (F2,36= 4.63–26.54, χ2222= 5.29–13.68, P= 0.0016–0.000). During the study period, Black-necked cranes devoted most of their daily activity time to foraging , which is about 76.81±9.1%. The percent time spent foraging showed two peaks; one peaking in the middle morning and another higher peak during late afternoon. The postponing of higher foraging peaks is a behavioral adjustment in response to the frigid weather of morning. Adult Black-necked Cranes showed significant differences in foraging, vigilance and aggression between flocks and families(F1,76= 0.27, 0.77, U= 279, P= 0.001–0.000), but there were no significant differences in juveniles(U=735–558, P=0.924–0.062). Adults foraging in flocks showed an advantage for having more foraging time and less vigilance than family-based units. Juveniles spent more time in foraging and resting compared to adults, with less time in vigilance and aggression contrary. There are differences with wintering behavior between various wintering areas. We explain these activity changes as a consequence of a behavioral adaptation to the local environment changes, while climate and food resources are important factors that affect wintering behavior.
 
 
 
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