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Introduced mangroves in the Society Islands, French Polynesia (South Pacific): invasive species or novel ecosystem?
Biological Invasions ( IF 2.9 ) Pub Date : 2021-04-16 , DOI: 10.1007/s10530-021-02520-9
Jean-Yves Meyer , Florent Taureau , Laetitia Bisarah , Rakamaly Madi Moussa , Elena Gorchakova , Anne Caillaud

Biotic mixing, where introduced and native species mix into a newly formed ecosystem, is an increasing phenomenon worldwide. It particularly affects islands, where the number of introduced plants often exceeds native ones, and where invasive alien species are one of the main threats to terrestrial biodiversity. The mangrove tree species Rhizophora stylosa, first introduced in French Polynesia (South Pacific) in the early 1930s, is now well established and found in nearly all the inhabited islands of the Society archipelago (Bora Bora, Huahine, Moorea, Raiatea, Tahaa, Tahiti). It forms dense thickets on coastal habitats and estuaries, and gradually colonizes native tidal grassland marshes and nearshore rocky habitats. In order to assess its current expansion, we mapped its distribution from satellite images interpretation and ground-truthing fieldwork. Results indicate that mangroves currently cover a total of 41 ha in the Society Islands. Expansion rate seems relatively slow, particularly in Moorea where only 2.8% of the coastline is colonized over 90 years after its introduction. A preliminary study of the socio-cultural perception of mangroves was undertaken through an online questionnaire sent to local stakeholders and NGOs. It revealed that although more than 70% of the respondents recognized R. stylosa as an introduced species, 40% considered that it had positive impacts and only 20% that it was a harmful species. A more detailed ecological and socio-economical cost–benefit analysis is still needed to provide clearer conclusions on the invasive status of mangroves in the Society Islands, and the most appropriate management strategies to be implemented by local authorities in collaboration with island communities.



中文翻译:

法属波利尼西亚(南太平洋)的社会群岛中引入的红树林:入侵物种还是新型生态系统?

在世界范围内,将引入的物种与本地物种混合成新形成的生态系统的生物融合现象正在日益增多。它尤其影响到岛屿,那里引进的植物数量经常超过原生植物,外来入侵物种是对陆地生物多样性的主要威胁之一。红树林树种Rhizophora stylosa于1930年代初在法属波利尼西亚(南太平洋)首次引入,现已完善,并在该学会群岛的几乎所有有人居住的岛屿(波拉波拉岛,华欣,莫雷阿岛,赖亚特阿,塔哈阿,塔希提岛)都有发现。它在沿海生境和河口上形成密集的灌木丛,并逐渐在本地潮汐草地沼泽和近岸岩石生境上定殖。为了评估其当前的扩展,我们从卫星图像解释和地面实地调查中绘制了其分布图。结果表明,红树林目前覆盖社会群岛共41公顷。扩张速度似乎相对较慢,特别是在莫雷阿岛(Moorea),在引入海岸线后的90年中,只有2.8%的海岸线被殖民。通过发送给当地利益相关者和非政府组织的在线调查问卷,对红树林的社会文化感知进行了初步研究。它表明,尽管超过70%的受访者认可R. stylosa是一种引进物种,有40%的人认为它具有正面影响,而只有20%的人认为它是有害物种。仍需要更详细的生态和社会经济成本效益分析,以得出关于社会群岛红树林的入侵状况以及地方当局与岛屿社区合作实施的最适当管理策略的更明确结论。

更新日期:2021-04-16
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