Nestedness-resultant community disassembly process of extinction debt in a highly fragmented semi-natural grassland
Nestedness-resultant community disassembly process of extinction debt in a highly fragmented semi-natural grassland
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高度破碎的半天然草地中巢状导致的灭绝债群落解体过程
DOI：
10.1007/s11258-018-0861-z
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发表时间：
2018
期刊：
影响因子：
1.7
通讯作者：
T. Osawa
中科院分区：
文献类型：
--
作者：
Tomoyo F. Koyanagi;Takuya Furukawa;T. Osawa
景观变化后的物种解体主要有两个过程：物种的非随机损失导致的嵌套组合和物种替换导致的空间物种周转。虽然物种对景观变化的时滞反应已被广泛认识，但很少有研究从经验上评估这两个过程中哪一个与灭绝债务关系更密切（即，栖息地丧失后物种灭绝推迟）。本研究旨在通过将β多样性分解为物种嵌套和物种周转两个组成部分来理解灭绝债务的潜在过程。我们测量了草地物种丰富度在三个空间范围内在一个高度分散的半天然草地景观在日本。基于差异性的β多样性被分成两个分量（即，嵌套-结果相异度[βsne]和周转-结果相异度[βsim]），使用主坐标分析（PCoA）对其进行进一步分析。PCoA轴1评分的变异性和当前和过去的栖息地比例之间的关系进行了评价。当前草原物种丰富度与过去（即，1910年代）草地所占比例最大。基于β sneshes的PCoA第一轴与过去栖息地比例显著相关，而基于β sim的PCoA轴与当前和过去栖息地比例均不显著相关。一个非随机的草原物种的损失所代表的嵌套灭绝债务在景观水平上发现。有一个预测的物种从嵌套的物种，这可能反映了物种的脆弱性梯度历史景观变化的损失的机会。
There are two major processes of species disassembly after landscape changes: non-random loss of species resulting in nested assemblages and species replacement resulting in spatial species turnover. Although time-lagged responses of species to landscape change have been widely recognized, few studies have empirically evaluated which of these two processes is more closely related to extinction debt (i.e., postponed species extinction following habitat loss). This study aimed to understand the underlying processes of extinction debt by partitioningβ-diversity into components of species nestedness and species turnover. We measured grassland species richness at three spatial extents in a highly fragmented semi-natural grassland landscape in Japan. Dissimilarity-basedβ-diversity was partitioned into two components (i.e., nestedness-resultant dissimilarity [βsne] and turnover-resultant dissimilarity [βsim]), which were further analyzed using principal coordinates analyses (PCoA). The relationships between the variability of PCoA axis 1 scores and the current and past habitat proportions were evaluated. A significant positive relationship between current grassland species richness and past (i.e., the 1910s) grassland proportion was found at the largest spatial extent. The first axis of PCoA based onβsneshowed significant correlation with past habitat proportions, whereas the PCoA axis based onβsimshowed no significant correlation with either the current or past habitat proportions. A non-random loss of grassland species represented by nestedness underlay the extinction debt found at the landscape level. There is a chance of predicting the loss of species from the nested ranks of species which likely reflects the gradient of species vulnerability to historical landscape changes.
草原植物功能群对历史景观变化的响应表现出明显的时滞
影响因子：
1.7
作者：
Koyanagi;T.;Kusumoto;Y.;Yamamoto;S.;Okubo;S.;Iwasaki;N.;Takeuchi;K.
通讯作者：
K.
对线性栖息地的历史影响：森林边缘植被中草地物种的当前分布
影响因子：
5.9
作者：
Koyanagi;T.;Kusumoto;Y.;Yamamoto;S.;Okubo;S.;Takeuchi;K.
通讯作者：
K.