Coastal habitats across sea-to-inland gradient sustain endangered coastal plants and Hymenoptera in coastal dune ecosystems of Japan
Coastal habitats across sea-to-inland gradient sustain endangered coastal plants and Hymenoptera in coastal dune ecosystems of Japan
复制标题
从海到内陆梯度的沿海生境维持着日本沿海沙丘生态系统中濒临灭绝的沿海植物和膜翅目
DOI：
10.1007/s10531-020-02065-8
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发表时间：
2020
影响因子：
3.4
通讯作者：
Ide Tatsuya
中科院分区：
文献类型：
--
作者：
Koyama Asuka;Ide Tatsuya
由于过去几十年的人类利用和灾害预防，沿海沙丘生态系统已经丧失，并日益破碎。一般而言，生境破碎化和连通性丧失导致物种生物多样性下降。在沿海沙丘生态系统中，沿海梯度生境的丧失可能是沿海物种多样性和生态系统功能下降的主要驱动因素。在这项研究中，我们评估了海岸植物和hyperteran昆虫的物种丰富度，在破碎的日本海岸沙丘使用6个网站，有和没有背沙丘栖息地。我们从2018年4月到9月每月记录植物物种及其开花状态，并检查景观因素对植物物种丰富度的影响。我们还评估了蜂类和黄蜂的物种丰富度，并将它们的决定因素与植物的决定因素进行了比较。我们总共鉴定了109种植物，包括33种本土沿海植物（其中10种濒临灭绝）和40种外来植物。本地植物物种的数量受到沙丘背面栖息地和沙丘大小的影响，而本地沿海植物物种的数量只受到沙丘背面栖息地的影响。与此相反，外来植物物种的数量只取决于沙丘的大小。共记录到蜂类昆虫58种，其中蜜蜂传粉昆虫28种，捕食性小蜂30种。蜂类种类的数量与蜜蜂和黄蜂的本地植物种类的数量呈正相关。总之，沿海梯度的栖息地丧失导致本地沿海植物物种的物种丰富度下降，导致传粉昆虫和捕食性昆虫群落的物种丰富度下降。由于最近的防灾活动，大多数跨越海洋到内陆梯度的沿海地区已经消失。我们的研究结果强调了迫切需要在残留的沿海沙丘生态系统的濒危物种的生物多样性保护。
Coastal sand dune ecosystems have been lost and increasingly fragmented due to human use and disaster prevention over the past few decades. Generally, habitat fragmentation and connectivity loss have led to the decline of species biodiversity. In coastal dune ecosystems, habitat loss across the coastal gradient may be a major driver of the decline in coastal species diversity and ecosystem functions. In this study, we assessed the species richness of coastal plants and hymenopteran insects in fragmented coastal dunes of Japan using six sites with and without back-dune habitats. We recorded plant species and their flowering status monthly from April to September 2018 and examined the effects of landscape factors on plant species richness. We also assessed the species richness of hymenopteran bees and wasps and compared their determinants with those of plants. In total, we identified 109 plant species, including 33 native coastal plants (10 of which are endangered) and 40 exotic plants. The number of native plant species was positively affected by the presence of back-dune habitat and sand dune size, while that of native coastal plant species was positively affected only by the presence of back-dune habitat. In contrast, the number of exotic plant species was dependent only on sand dune size. We recorded 58 hymenopteran species including 28 bee pollinators and 30 predatory wasp species. The number of hymenopteran species was positively related to the number of native plant species for both bees and wasps. In conclusion, habitat loss across the coastal gradients led to decreased species richness of native coastal plant species, resulting in reduced species richness of pollinator and predatory insect communities. Most of the coastal areas across sea-to-inland gradients have been lost due to recent disaster prevention activities. Our results highlight the urgent need for biodiversity conservation of endangered species in remnant coastal dune ecosystems.