Plant and herbivorous insect diversity loss are grater than null model expectations due to land-use changes in agro-ecosystems
Plant and herbivorous insect diversity loss are grater than null model expectations due to land-use changes in agro-ecosystems
复制标题
由于农业生态系统土地利用变化，植物和草食昆虫多样性丧失大于零模型预期
DOI：
10.1016/j.biocon.2016.07.017
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发表时间：
2016
影响因子：
5.9
通讯作者：
Hiraiwa MK and Ushimaru A
中科院分区：
文献类型：
--
作者：
Uchida K;Hiraiwa MK and Ushimaru A
土地利用变化对植物多样性的影响是一个重要的问题，因为植物多样性对维持农业生态系统中受威胁昆虫的多样性至关重要。虽然许多研究已经检查了一些受威胁物种的模式，但很少有研究在比较不同营养水平的生物体时检查了大量的受威胁物种。利用物种丰富度和红色名录指标（RLI），沿土地利用梯度对农业生态系统中常见和受威胁物种的群落分布格局进行评价。本研究考察了半自然草原撂撂撂撂地、传统撂撂地和集约化撂撂地3种撂撂地类型中植物和草食性昆虫的局部和区域多样性，并通过零模型分析比较了观测值和预测值。研究表明，传统土地利用方式保持了植物和草食性昆虫的丰富度和RLI。然而，在土地撂荒和集约化利用的地点，受威胁植物和食草昆虫的数量显著低于零模型预期。虽然植物丰富度而非RLI是维持草食性昆虫丰富度和RLI的主要原因，但植物丰富度与植物RLI不呈线性相关。濒危植物并不依赖于植物的丰富度，因此识别和保护植物和食草动物多样性的独特环境至关重要。总之，我们应该在集约利用和废弃草原中重新引入传统的土地利用方式。国家和地方政府对半自然草原适当管理的支持有利于地方（如本研究区）和国家（日本）层面的生物多样性保护。
The effect of land-use changes on plant diversity is an important issue, as plant diversity is vital to maintaining of threatened insect diversity in agro-ecosystems. Although many studies have examined patterns of a few threatened species, few studies have examined a large number of threatened species while comparing organisms of different trophic levels. Observed and expected community assembly patterns of common and threatened species should be evaluated along land-use gradients in agro-ecosystems, using species richness and red list indicator (RLI). This study examined local and regional diversity of plants and herbivorous insects among abandoned, traditional, and intensified land-use types in semi-natural grasslands and compared observed and expected values via null model analysis. This study showed that the richness and RLI of plants and herbivorous insects were maintained in the traditional land-use. However threatened plants and herbivorous insects at sites of land abandonment and intensified use were significant lower than null model expectations. Although, plant richness, rather than RLI, was responsible for maintaining richness and the RLIs of herbivorous insects, plant richness did not linearly correlate with plant RLIs. Threatened plants did not depend on plant richness, it will be vital to identify and conserve unique environments for diversity of plants and herbivores. In conclusion, we should reintroduce traditional land-use practices in intensified use and abandoned grasslands. National and local governmental support for the appropriate management of semi-natural grasslands is beneficial for biodiversity conservation at both the local (e.g., present study area) and national (Japanese) levels.