摘要
2013年6月,对七星河湿地自然保护区中苍鹭（Ardea cinerea）、大白鹭（Egretta alba）及其所食鱼类进行了调查与取样,并对鱼、鹭对汞的暴露状况进行了分析,探讨了鹭类食性的差异对其汞暴露程度的影响,其结果如下：（1）七星河湿地自然保护区苍鹭雏鸟胸羽的总Hg平均含量（47.14±26.43）μg/kg（18.28~89.65）μg/kg;大白鹭雏鸟胸羽的总Hg平均含量（35.19±14.23）μg/kg（10.38~67.28）μg/kg。（2）苍鹭的食物既包括鱼类也有昆虫,其中包括葛氏鲈塘鳢（Perccottus glenii）（3只,25%）、鲫（Carassius auratus）（2只,16.67%）、泥鳅（Misgurnus anguillicaudatus）（3只,25%）、洛氏（鱼岁）（Phoxinus lagowskii）（2只,16.67%）以及龙虱（2只,16.67%）;大白鹭的食物则主要以鱼类为主,其中包括葛氏鲈塘鳢（2只,18.18%）、鲫（6只,54.55%）、泥鳅（1只,9.09%）和洛氏（鱼岁）（2只,18.18%）;两鹭食性相似率为61%。（3）对2种鹭类所食4种鱼类的总Hg含量进行了测量,其中葛氏鲈塘鳢的总Hg含量最高平均Hg含量为（118.86±64.11）μg/kg,其次为洛氏（鱼岁）和鲫（101.73±29.67）μg/kg,（36.56±36.53）μg/kg,泥鳅的总Hg含量最低（14.65±5.34）μg/kg;而2种鹭类所食4种鱼类的体长大小顺序为：鲫（15.26±5.22）cm〉泥鳅（11.83±3.66）cm〉葛氏鲈塘鳢（11.12±3.02）cm〉洛氏（鱼岁）（8.30±2.04）cm。
Nestlings of grey heron（ Ardea cinerea）, great egret（ Egretta alba）and samples of their food items were collected at Qixinghe National Nature Reserve in June 2013. Mercury content of samples was analyzed and we studied the effect of diet differences of herons on the extent of their exposure to mercury. The range of total mercury content of grey heron chick feathers was 18 -90 iJg/kg, and the average was（47 ±26）μg/kg. The range of total mercury content of great egret chick feathers was 10 -67μg/kg and the average was（35±14） μg/kg. The food of grey heron consisted of fishes and insects, including Perccottus glenii（ 3, 25% ）, Carassius auratus （ 2, 17% ）, Misgumus anguillicaudatus（ 3, 25% ）, Phoxinus lagowski（2, 17% ） and Dytiscidae sp. （a leach, 2, 17%） ; great egret food was mainly fishes, including P. glenii（2, 18%）, C. au- ratus（6, 55%）, M. anguillicaudatus（1, 9%）and P. lagowski（2, 18%）. Similarity of the diet of the two species was 61%. Total mercury content of four species of fish eaten by the two herons was tested. The total mercury content of P. glenii was highest （ 119 ± 64） μg/kg, followed by P. lagowski（102 ±30）μg/kg and C. auratus（37 ±37）μg/kg. M. anguillicaudatus was lowest at（ 15 ±5）μg/kg. The rank order of body length of the four species of fish was： C. auratus（15 ±5）cm 〉 M. anguillicaudatus（ 12 ± 4 ） cm 〉 P. glenii（ 11 ± 3 ） cm 〉 P. lagowski（ 8 ±2 ） cm.
出处
《野生动物学报》
北大核心
2015年第2期191-196,共6页
CHINESE JOURNAL OF WILDLIFE
基金
国家自然科学基金青年科学基金项目(31400471)
中央高校基本科研业务费专项资金资助(2572014EA07-02)
关键词
湿地
鹭类
食性差异
汞含量
Wetland
Herons
Diet differernces
Mercury content
