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黄山九龙峰尖头鱥的年龄鉴定

程方圆,程庆庆,程乐华,陈梦云,成慧洁,严云志**   

  1. (安徽师范大学生命科学学院, 安徽省高校生物环境与生态安全省级重点实验室, 安徽芜湖 241000)
  • 出版日期:2014-08-10 发布日期:2014-08-10

Age determination of Phoxinus oxycephalus from the JiulongPeak of the Huangshan Mountain.

CHENG Fang-yuan, CHENG Qing-qing, CHENG Le-hua, CHEN Meng-yun, CHENG Hui-jie, YAN Yun-zhi**    

  1. (Provincial Key Laboratory of Biotic Environment and Ecological Safety in Anhui, College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, China)
  • Online:2014-08-10 Published:2014-08-10

摘要:

鱼类的年龄鉴定及其最佳骨质材料的选择,是鱼类年龄研究的必要前提,也是鱼类基础生物学和生态学研究的基础。利用2012年4月于黄山九龙峰采集的132尾尖头鱥标本,研究了其鳞片、鳃盖骨、脊椎骨和耳石等骨质材料的年轮特征,并以根据全长分布频率确定的“真实年龄”为参照,比较了鳃盖骨、脊椎骨和微耳石在年龄判读中的精确度和准确度。尖头鱥体侧部和尾柄部的鳞片均无任何年轮标志,星耳石磨片上暗带和明带排列无明显规律,但鳃盖骨、脊椎骨和微耳石上存在明显年轮。鳃盖骨、脊椎骨和微耳石3种骨质材料的年龄判读精确度或准确度差异视不同年龄组有所不同。总体上,脊椎骨年龄判读的精确度最高,鳃盖骨次之,微耳石最低;但年龄判读的准确度正好相反,即微耳石最高、脊椎骨最低。因此,微耳石是尖头鱥年龄鉴定的最佳骨质材料,而其较低的年龄鉴定精确度及其对准确度的潜在影响可通过提高磨片质量和优化判读方法来改善。
 

关键词: 城市绿化树, 叶绿素荧光, 透水硬化地表, 不透水硬化地表, 净光合速率

Abstract: Identifying the optimal bone structure for age determination is a basis for examining fish age composition and surveying fish biological and ecological traits. Based on the 132 specimens of Chinese minnow, Phoxinus oxycephalus, collected from the JiulongPeak of the Huangshan Mountain during April 2012, the annulus characteristics on the scale, operculum, vertebra and otolith were identified and, according to the “true age” determined from length frequency distributions, the precision and accuracy of the observed ages determined by operculum, vertebra and lapillus otolith were compared in this study. No distinct annulus marker was observed on the scales taken from both lateral body and caudal peduncle and on the asteriscus otolith, but annuli could be observed on operculum, vertebra and lapillus otolith. According to the average error percent of aging, both precision and accuracy in the age determined by operculum, vertebra and lapillus otolith varied across agegroups. Overall, the highest precision was observed for vertebra and the lowest for lapillus otolith; however, the accuracy showed an opposite pattern. These results suggest that lapillus otolith is the optimal structure for aging P. oxycephalus, of which the relatively low precision in age determination and its potential effect on the accuracy may be mitigated by improving the quantity of observed structures and by optimizing the aging method.

Key words: net photosynthetic rate, impervious pavement, chlorophyll fluorescence, urban tree, pervious pavement