Relative importance of within-habitat environment, land use and spatial autocorrelations for determining odonate assemblages in rural reservoir ponds in Japan
Relative importance of within-habitat environment, land use and spatial autocorrelations for determining odonate assemblages in rural reservoir ponds in Japan
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DOI：
10.1007/s11284-008-0531-z
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发表时间：
2009-05
影响因子：
2
通讯作者：
Kenji Hamasaki;Takehiko Yamanaka;Koichi Tanaka;Y. Nakatani;N. Iwasaki;D. Sprague
中科院分区：
文献类型：
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作者：
Kenji Hamasaki;Takehiko Yamanaka;Koichi Tanaka;Y. Nakatani;N. Iwasaki;D. Sprague
为了阐明影响农村水库池塘中齿形动物组合的主要因素，在生境内环境，池塘周围的土地利用和空间自相关性，我们调查了齿形动物成年人（Zygoptera和Anisoptera）在茨木县，日本，在2005年的三个采样期在70个研究池塘。对这三个因子组进行了RDA分析，以确定它们在解释齿科物种组成方面的强度。用变异划分法评价了它们的相对贡献。在研究池塘中共记录了41种牙形石，其中24种，不包括稀有物种，用于我们的分析。包括所有三个因素组的总和效应解释了约39%的齿科物种组成的变化。我们发现，空间自相关是最重要的，虽然在栖息地内的环境和土地利用具有可比的效果。我们的结论是，空间自相关应考虑在这种类型的分析，虽然我们不能清楚地解释是什么造成了这样的空间结构。池塘面积和堆积在池塘底部的碎屑被选为内生境环境，池塘周围的森林和稻田被选为土地利用后，逐步向前选择的程序。这些结果表明，最近减少森林周围的池塘有一个负面影响的牙形石组合。
To clarify the major factors affecting odonate assemblages in rural reservoir ponds among within-habitat environments, land use around ponds and spatial autocorrelation, we surveyed odonate adults (Zygoptera and Anisoptera) in 70 study ponds in Ibaraki Prefecture, Japan, during three sampling periods in 2005. Redundancy analyses (RDA) for these three factor groups were executed to determine their strength in explaining the odonate species composition. Their relative contributions were also evaluated by the method of variation partitioning. A total of 41 odonate species were recorded in the study ponds, and 24 of them, excluding rare species, were used for our analysis. Summed effects including all three factor groups explained approximately 39% of the variation in odonate species composition. We found that spatial autocorrelation was the most important, though the within-habitat environment and land use had comparable effects. We conclude that spatial autocorrelation should be considered in this type of analysis, though we could not clearly explain what caused such a spatial structure. Pond area and debris that had accumulated at the bottom of ponds were selected as the within-habitat environment, and the forests and paddy fields around ponds were selected for land use after the procedure of forward stepwise selection. These results suggest that the recent decrease of forests around the ponds has had a negative effect on the odonate assemblages.