Volume 21 Issue 1
Jan.  2000
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ZHU Xi, YANG Shi-de, ZOU Xiao-ping, CHEN Wei-zhen, REN Jin-bo. The Breeding Habits and Growth of The Nestling Blackcrowned Night Heron,Nycticorax nycticorax. Zoological Research, 2000, 21(1): 58-64.
Citation: ZHU Xi, YANG Shi-de, ZOU Xiao-ping, CHEN Wei-zhen, REN Jin-bo. The Breeding Habits and Growth of The Nestling Blackcrowned Night Heron,Nycticorax nycticorax. Zoological Research, 2000, 21(1): 58-64.

The Breeding Habits and Growth of The Nestling Blackcrowned Night Heron,Nycticorax nycticorax

  • Received Date: 1900-01-01
  • Rev Recd Date: 1900-01-01
  • Publish Date: 2000-02-22
  • From 1994 to 1998,observations on the breeding habits and growth of the nestling of black-crowned heron were made in the Changshan and Yuhang Bird Reserve,Zhejiang Province.The results were as following:1)The adults migrated to this reserve in the middle and late April and lefted in the late September.2)Average height of nests from grownd was 8.51 m and the nests were simple,dash-shapped with following measurements:external diameter 30-50 cm,internal diameter 20-30 cm,depth 3.5-8.0 cm.3.)The average number of egg of 35 clutches was 3.49,the incubation period 22-26 days,the survival rate in incubation period 95.45%,the length of nursing period about 30-35 days.4)The body weight of the nesting was 26.8 g at the 1st day of hatching,and increases to a maximun of 556 g at the 51 th day.The growth of weight in 51 days after birth was fitted by the following model:W[t]=560/1+e[-0.231(t-12)] with R[2]=0.99.The length-weight relationship could be expres sed in the following formula:W=0.000246 L[2.5029].5)The process of establishment of homeothermal ability involved 3 periods:(I)the confused growth period (1-16 day);(ii)the growth period (17-28 day);(iii)the homeothermal period (after 28 day).6)The main food of nestlings is Cambaroides (45%),Cyprinidae (40%),Cobitaidae (15%).
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The Breeding Habits and Growth of The Nestling Blackcrowned Night Heron,Nycticorax nycticorax

Abstract: From 1994 to 1998,observations on the breeding habits and growth of the nestling of black-crowned heron were made in the Changshan and Yuhang Bird Reserve,Zhejiang Province.The results were as following:1)The adults migrated to this reserve in the middle and late April and lefted in the late September.2)Average height of nests from grownd was 8.51 m and the nests were simple,dash-shapped with following measurements:external diameter 30-50 cm,internal diameter 20-30 cm,depth 3.5-8.0 cm.3.)The average number of egg of 35 clutches was 3.49,the incubation period 22-26 days,the survival rate in incubation period 95.45%,the length of nursing period about 30-35 days.4)The body weight of the nesting was 26.8 g at the 1st day of hatching,and increases to a maximun of 556 g at the 51 th day.The growth of weight in 51 days after birth was fitted by the following model:W[t]=560/1+e[-0.231(t-12)] with R[2]=0.99.The length-weight relationship could be expres sed in the following formula:W=0.000246 L[2.5029].5)The process of establishment of homeothermal ability involved 3 periods:(I)the confused growth period (1-16 day);(ii)the growth period (17-28 day);(iii)the homeothermal period (after 28 day).6)The main food of nestlings is Cambaroides (45%),Cyprinidae (40%),Cobitaidae (15%).

ZHU Xi, YANG Shi-de, ZOU Xiao-ping, CHEN Wei-zhen, REN Jin-bo. The Breeding Habits and Growth of The Nestling Blackcrowned Night Heron,Nycticorax nycticorax. Zoological Research, 2000, 21(1): 58-64.
Citation: ZHU Xi, YANG Shi-de, ZOU Xiao-ping, CHEN Wei-zhen, REN Jin-bo. The Breeding Habits and Growth of The Nestling Blackcrowned Night Heron,Nycticorax nycticorax. Zoological Research, 2000, 21(1): 58-64.

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