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Historical distribution of Arctic lamprey Lethenteron camtschaticum in Japanese rivers and its change estimated from fishery statistics and fishers’ local ecological knowledge
Fisheries Science ( IF 1.9 ) Pub Date : 2021-04-29 , DOI: 10.1007/s12562-021-01518-5
Hiroaki Arakawa , Daisuke Kishi , Seiji Yanai

This study identified the location and geographical characteristics of rivers where Arctic lamprey Lethenteron camtschaticum were captured in the past and present in Japan and evaluated the effectiveness of the local ecological knowledge (LEK) held by inland fishers for estimating species distribution. We collected information about fishery harvests for Arctic lamprey from fishery statistics published in the 1930s and directly from inland fishery cooperatives (FCs). The presence of a historical harvest and its southern limit were largely consistent between the two resources. The fishery harvest was historically distributed in relatively large rivers, with a low downstream gradient, along the Sea of Japan, and the southern limit was estimated to be in the range of 36.45–37.33° N. The number of active FCs decreased from a historical value of 59 to only 14 at present. The southern limit shifted further north to 43.13° N. The LEK from FCs provided sufficient information to estimate the spatial distribution within the local rivers and revealed that a decline in fishery activity had occurred in the upper reaches of rivers. Our data can be used as a baseline for the restoration of Arctic lamprey and to develop a monitoring tool to improve the conservation of inland biodiversity.



中文翻译:

北极of鱼在日本河流中的历史分布及其根据渔业统计数据和渔民当地生态知识估计的变化

这项研究确定了北极七lamp鳗Lethenteron camtschaticum的河流的位置和地理特征在日本过去和现在都被捕捞,并评估了内陆渔民掌握的当地生态知识(LEK)对估计物种分布的有效性。我们从1930年代发布的渔业统计数据中直接收集了北极七lamp鳗的渔业收成信息,也直接从内陆渔业合作社(FC)收集了有关信息。两种资源之间的历史收成及其南部界限在很大程度上是一致的。历史上,渔业产量分布在沿日本海的相对较大的河流中,下游坡度较低,估计南限在北纬36.45-37.33°之间。值从59降至目前的14。南部界限进一步向北移至北纬43.13°。FC的LEK提供了足够的信息来估计当地河流的空间分布,并揭示了上游河流的渔业活动有所减少。我们的数据可以用作恢复北极七lamp鳗的基线,并可以开发一种监测工具来改善内陆生物多样性的保护。

更新日期:2021-04-29
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