Dragonfly crisis in Japan: A likely consequence of recent agricultural habitat degradation
Dragonfly crisis in Japan: A likely consequence of recent agricultural habitat degradation
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DOI：
10.1016/j.biocon.2009.02.033
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发表时间：
2009-09-01
影响因子：
5.9
通讯作者：
Washitani, Izumi
中科院分区：
文献类型：
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作者：
Kadoya, Taku;Suda, Shin-ichi;Washitani, Izumi
许多日本的水稻品种依赖于在稻田系统中维持的生境复合体。我们推测，最近改变稻田系统中的栖息地复合体的种群，特别是那些“曾经常见的物种”，主要依赖于稻田系统的自然洪泛区栖息地的损失产生了不利影响。大部分的日本lentia物种依赖于稻田或农业池塘，已经广泛退化，而lotic物种往往可以使用稻田和自然河流系统。因此，我们还假设，lentic物种更容易受到农业栖息地的变化，并受到更高的灭绝风险比lotic物种。我们的目标是通过对所涉及的过程的机械见解来扩展先前关于估计物种灭绝风险的工作。通过分析（1）先前对物种灭绝风险的定量评估与（2）物种的生态特征（即，分布范围和生境类型[lentic或lotic]）。在那些灭绝风险较高的物种中，长寿物种所占比例不成比例。分布范围较大的物种也比分布范围较窄的物种面临更高的灭绝风险，反映了一种在全国范围内发挥作用的驱动力（即，稻田系统严重退化）。(C)2009爱思唯尔有限公司保留所有权利。
Many Japanese dragonfly species depend on habitat complexes maintained in rice paddy systems. We postulated that recent alterations to habitat complexes in paddy systems have had adverse effects on dragonfly populations, especially those 'once common species' that have come to depend primarily on paddy systems following losses of natural floodplain habitats. A high proportion of Japanese lentic dragonfly species depends on paddy fields or agricultural ponds that have been extensively degraded, while lotic species can often use both paddies and natural river systems. Thus we also postulated that lentic species are more susceptible to changes in agricultural habitats and are subject to higher extinction risks than lotic species. We aimed to extend previous work on estimating dragonfly extinction risk by developing mechanistic insights into the processes involved. Postulates were tested by analyzing relationships between (1) previous quantitative extinction risk assessments for dragonfly species and (2) species' ecological characteristics (i.e., distribution range and habitat type [lentic or lotic]). Lentic species were disproportionately represented among those with elevated extinction risk. Species with large distribution ranges were also subject to higher extinction risks than those with narrower ranges, reflecting a driving force acting at a national scale (i.e., intensive degradation of paddy systems). (C) 2009 Elsevier Ltd. All rights reserved.