澜沧江西藏段鱼类优先保护等级评价

Quantitative assessment of the priority conservation of fishes in the Tibet reach of the Lancang River,China

由于澜沧江西藏段鱼类生存现状不清且历史资料缺乏不利于其渔业资源的保护与管理,因此,尽快开展澜沧江西藏段土著鱼类的保护等级评价尤为重要。本研究以2017-2019年澜沧江西藏段现场调查所获取的鱼类资源、生态习性、栖息地现状等数据为基础,结合文献资料,系统评价了澜沧江西藏段7种主要土著鱼类的优先保护等级。通过对珍稀性、物种价值和人为干扰3个一级评价指标,以及种型情况、分布范围、资源现状、生态价值、栖息地质量5个二级评价指标进行评价打分,基于各一级指标的权重汇总得到了各评价对象的优先保护综合评价值。结果显示:德钦纹胸[鱼兆](Glyptothorax deqinensis)的分值最高,为0.77,其次为细尾[鱼兆](Pareuchiloglanis gracilicaudata)和无斑褶[鱼兆](Pseudecheneis immaculatus),得分均为0.74,随后依次是裸腹叶须鱼(Ptychobarbus kaznakovi)0.60、前腹裸裂尻鱼(Schizopygopsis anteroventris)0.48、澜沧裂腹鱼(Schizothorax lantsangensis)0.37、光唇裂腹鱼(Schizothorax lissolabiatus)0.35。基于综合评价值,将德钦纹胸[鱼兆]、细尾[鱼兆]和无斑褶[鱼兆]列为一级优先保护鱼类,裸腹叶须鱼列为二级优先保护鱼类,前腹裸裂尻鱼列为三级优先保护鱼类,澜沧江裂腹鱼和光唇裂腹鱼列为四级优先保护鱼类。

Due to limited historical and current data,it is difficult to effectively protect and manage the fishery resources in the Tibet reach of the Lancang River.Therefore,assess priority conversation levels of the indigenous fishes in the Tibet reach of the Lancang River as soon as possible is great significance.Based on the fishery resources,ecological habits and fish habitat survey was carried out during 2017-2019 in the Tibet reach of the Lancang River and combined with relevant literature,we evaluated the priority conversation levels of seven native fish species from the Tibet reach of the Lancang River.The evaluation was based on three primary indicators'comprehensive total scores(value of rareness,species value and human interference)and five secondary indicators(taxonomic singularity,distribution range,current resources,ecological value and habitat quality).The results showed that Glyptothorax deqinensis,Pareuchiloglanis gracilicaudata and Pseudecheneis immaculatus were the most priority conservation fish.Ptychobarbus kaznakovi was the second priority conservation fish.Schizopygopsis anteroventris was the third priority conservation fish.Schizothorax lantsangensis and Schizothorax lissolabiatus were the fourth priority conservation fish.The evaluation results of the priority conversation fit the actual situation well.