Effects of modern drainage systems on the spatial distribution of loach in rice ecosystems
Effects of modern drainage systems on the spatial distribution of loach in rice ecosystems
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DOI：
10.1002/aqc.1169
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发表时间：
2011-03
影响因子：
2.4
通讯作者：
Naoki Katayama;Daigo Saitoh;Tatsuya Amano;T. Miyashita
中科院分区：
文献类型：
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作者：
Naoki Katayama;Daigo Saitoh;Tatsuya Amano;T. Miyashita
1.虽然稻田养育了许多水生物种，但亚洲最近的农业集约化导致了淡水鱼等生物多样性的丧失，以换取农业生产力的提高。日本近几十年来引进了现代化的排水系统。2.本研究探讨了现代排水系统的几个方面的影响的空间分布的道场泥鳅泥鳅anguillicaudatus，在日本稻田的优势鱼类。3.多模型推理方法和层次划分，估计的方向和程度，每个系统对道场泥鳅的空间分布的影响。4.与现代排水系统相关的三个变量（田地和沟渠之间的间隙，排水沟的类型，以及地下排水管道的存在），洪水日期和空间自协变量对泥鳅的丰度有显着影响。特别是，在调查的后期（六月），在所有变量中，差距对泥鳅的影响最大。5.根据研究结果，讨论了日本对稻田鱼类实施的几种保护方法的有效性。这些知识将指导亚洲和其他国家适当保护淡水鱼。
1. Although rice fields support many aquatic species, recent agricultural intensification in Asia has led to loss of biodiversity, such as freshwater fish, in exchange for increased agricultural productivity. In Japan, modern drainage systems have been introduced in recent decades. 2. This study investigated the effects of several aspects of modern drainage systems on the spatial distribution of dojo loach Misgurnus anguillicaudatus, a dominant fish species in Japanese rice fields. 3. Multimodel inference approaches and hierarchical partitioning were used to estimate the direction and degree of the effect of each system on the spatial distribution of dojo loach. 4. Three variables related to modern drainage systems (gaps between fields and ditches, the type of drainage ditch, and the presence of underground drainage pipes), flooding dates, and spatial autocovariates showed significant influence on the abundance of loach. In particular, gaps had the largest impact among all the variables on loach in the later part of the survey (June). 5. Based on the results, the effectiveness of several conservation methods implemented for paddy-dwelling fish in Japan was discussed. The knowledge will be a guide to the appropriate conservation of freshwater fish in Asia and other countries.