生物多样性 ›› 2005, Vol. 13 ›› Issue (5): 407-415.doi: 10.1360/biodiv.050019

所属专题: 探索长江流域物种的濒危机制

• 论文 • 上一篇    下一篇

江湖阻隔对短吻间银鱼空间发生格局的影响

王忠锁1, 2, 吕偲1, 许崇任1*, 雷光春1*   

  1. 1(北京大学生命科学学院, 北京 100871)
    2(首都师范大学生命科学学院, 北京 100037)
  • 收稿日期:2005-01-17 修回日期:2005-08-28 出版日期:2005-09-20
  • 通讯作者: 许崇任 雷光春

Impact of river-lake isolation on the spatial distribution pattern of Hemisalanx brachyrostralis

Zhongsuo Wang 1, 2, Cai Lu 1, Chongren Xu 1*, Guangchun Lei 1*   

  1. 1College of Life Sciences, Peking University, Beijing 100871
    2College of Life Sciences, Capital Normal University, Beijing 100037
  • Received:2005-01-17 Revised:2005-08-28 Online:2005-09-20
  • Contact: Chongren Xu Guangchun Lei

基于2001-2003年长江流域86个水体短吻间银鱼资源的连续调查, 本文报道了短吻间银鱼(Hemisalanx brachyrostralis)在流域尺度上的分布格局和年度动态, 分析了其时空分布格局与湖泊面积和隔离因子间的关系, 探讨了流域江-湖水网系统破碎化对短吻间银鱼种群结构和动态的影响。结果显示短吻间银鱼仅分布于葛洲坝以下的长江中下游, 发生率低(年均21.3%), 空间发生格局年度变动频率高, 种群稳定性低。调查湖泊内目标种发生率、种群稳定性均与湖泊面积呈正相关关系, 而与湖泊隔离系数呈负相关关系; 三年的发生格局始终极显著地正相关于湖泊的面积因子, 同时负相关于湖泊的隔离因子。表明江湖阻隔所引发的湖泊水面缩减和湖间隔离度增大对短吻间银鱼资源产生了深刻的影响, 对其空间格局的形成贡献显著。

During 2001-2003, we conducted a survey on icefish resources in the Yangtze River basin, aiming to find out the impacts of habitat fragmentation on the population structure and dynamics of the species Hemisalanx brachyrostralis. By investigating the presence/absence of the target species in 86 water bodies, we analysed its temporal-spatial distribution patterns in relation to two important habitat parameters—water area and isolation. The results indicated that this species was mainly distributed in lakes affiliated with the mid-lower reaches of the Yangtze River, showing low incidence of occurrence (IO=21.3%, annual mean), frequent change in spatial pattern, and unstable population structure from year to year. Further analysis showed that both the IO and population stability of this species related positively to the water area index but negatively to the isolation index of the lakes studied. Binary logistic regression elucidated the presence/absence structure of H. brachyrostralis in the three years, showing presence of the species was positively related to water area index with high significance and negatively related to isolation index with significance. We conclude that the process of river-lake fragmentation, which results in the decrease of water area and increase of lake isolation, has major impacts on the spatial structure and dynamics of H. brachyrostralis along the Yangtze River basin.

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