PDF(Pubmed)
Abstract：
Sesuvium portulacastrum is a perennial halophyte of family Aizoaceae, non-native to Egypt, which was introduced from France ten years ago as an ornamental species. This study reports the detection of S. portulacastrum in the wild in Egypt. Voucher specimens were deposited in the Herbarium of Alexandria University (ALEX). A population of the species was recorded in the wild near Maruit Lake in the north-western coast of Egypt in 2018 during plant resources surveys of the region. The study aimed to assess the potential for S. portulacastrum to spread as an alien species through field observations and geospatial measurements under current conditions in its new habitat. The measured morphological parameters were higher than those recorded in its native habitats. The field observation for three years revealed that the species is proliferating and expanding in the investigated site forming large mats of mean size of up to 9 m2. The spatial extent of S. portulacastrum based on the EOO and AOO was quantified, and the expansion rate was estimated at 0.16 ha/year in the investigated site. The geospatial parameter used in the study will not only help in determining the spread rate of the alien species spatially and temporally, but also in its effective management through guiding managers in developing monitoring plans for the species under the changing climate uncertainty. Continuous monitoring and early detection of any potential threats of the introduced species are highly recommended, to avert any potential adverse impacts on native biodiversity and assess its behaviour in the wild habitat.
摘要：
SesuviumMassulacastrum是菊科的多年生盐生植物，非埃及本地人,它是十年前从法国引进的一种观赏物种。本研究报道了在埃及野外检测到的马齿轮轴。凭证标本存放在亚历山大大学植物标本室（ALEX）中。2018年，在对该地区的植物资源调查期间，在埃及西北海岸的Maruit湖附近的野外记录了该物种的种群。该研究旨在评估S.portulacastrum在其新栖息地的当前条件下通过实地观测和地理空间测量作为外来物种传播的潜力。测得的形态参数高于其天然栖息地记录的形态参数。三年的实地观察表明，该物种在被调查地点正在增殖和扩张，形成平均大小达9平方米的大垫子。对基于EOO和AOO的马齿轮轴的空间范围进行了量化，调查地点的扩展速率估计为0.16公顷/年。研究中使用的地理空间参数不仅有助于确定外来物种在空间和时间上的传播速率，而且还通过指导管理者在不断变化的气候不确定性下制定物种监测计划来进行有效管理。强烈建议持续监测和早期发现引进物种的任何潜在威胁，避免对本地生物多样性的任何潜在不利影响，并评估其在野生栖息地的行为。
