ABSTRACT

The Juan Fernández islands (Chile) are a volcanic archipelago, 670 km away from the continent. Arachnids still remain understudied in those islands. We report the first two records of Parabalta reedii (Butler, 1874 Butler AG. 1874. Descriptions of five new species of Gonyleptes. Zool J Linn Soc. 12(58):151–155.[Crossref] , [Google Scholar])) (Opiliones, Gonyleptidae) from the Robinson Crusoe Island. One specimen was collected near San Juan Bautista town (in 2011), while a population was documented in 2020, in secondary forests also around town. Since other arachnological expeditions did not report the presence of this species, it is suggested that these findings might correspond to an incipient introduction, possibly associated with imported goods from the continent. Otherwise, it would be hard to explain why such a conspicuous harvestman has not been noticed before. An accurate assessment of the native or introduced nature of these populations will require further mainland and island surveys, as well as molecular studies. We aim to call the attention to a possible new invasive species in the Juan Fernández archipelago. Oceanic islands have a strong conservation value because of their high levels of endemicity and vulnerability to biological invasions. This finding could be considered as a warning call for other potential arthropod introductions.

摘要

胡安费尔南德斯群岛（智利）是一个火山群岛，距大陆 670 公里。这些岛屿上的蛛形纲动物仍未得到充分研究。我们报告了Parabalta reedii的前两个记录（巴特勒，1874 巴特勒股份公司。1874 年。五种新弓形虫的描述。Zool J Linn Soc. 12（58）：151 - 155。[交叉引用]  ，[谷歌学术])) （Opiliones，Gonyleptidae）来自鲁滨逊漂流记岛。一个标本是在圣胡安包蒂斯塔镇附近（2011 年）采集的，而 2020 年在城镇周围的次生林中记录了一个种群。由于其他蜘蛛学探险没有报告该物种的存在，因此建议这些发现可能与早期引入相对应，可能与从该大陆进口的商品有关。否则，很难解释为什么以前没有注意到这样一个显眼的收割者。对这些种群的原生或外来性质的准确评估将需要进一步的大陆和岛屿调查以及分子研究。我们的目标是引起人们对胡安·费尔南德斯群岛可能出现的新入侵物种的关注。海洋岛屿具有很强的保护价值，因为它们具有高度的地方性和易受生物入侵的影响。这一发现可以被视为对其他潜在节肢动物引入的警告。