Giudice Gabriela E, Ramos Giacosa Juan Pablo, Luján Luna María, Yañez Agustina, de la Sota Elías R
Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s/no, 1900 La Plata, Argentina.
Rev Biol Trop. 2011 Sep;59(3):1037-46.
Punta Lara Natural Reserve shelters the relict of the Southernmost riparian forest in the world, where the flora is threatened by the anthropic expansion and by the introduction of exotic species. In this area the ferns and lycophytes grow in particular environments as marshland, grassland and marginal forest. The aim of this work was to evaluate the diversity of ferns and lycophytes that inhabit in Punta Lara Natural Reserve. Field trips were conducted from 2006 to 2009 and local herbaria and specific bibliography were also revised. As a result of our study twenty four taxa of ferns and lycophytes were recognized. Their habit was mainly terrestrial (70%), fewer aquatic (17%) and epiphytic (13%). Five native taxa were scarcely recorded whereas two native species previously documented were not found. We assume that the main threats on ferns and lycophytes populations in Punta Lara Reserve are: removal for comercialization, invasion by exotic species and climatic fluctuations (drought periods). Keys for taxa identification are given and strategies for the conservation of threatened taxa are proposed.
蓬塔拉拉自然保护区庇护着世界最南端河岸森林的遗迹，这里的植物群受到人类扩张和外来物种引入的威胁。在该地区，蕨类植物和石松类植物生长在诸如沼泽地、草原和边缘森林等特殊环境中。这项工作的目的是评估蓬塔拉拉自然保护区内蕨类植物和石松类植物的多样性。2006年至2009年进行了实地考察，还查阅了当地的植物标本馆和相关专业文献。我们的研究结果识别出了24种蕨类植物和石松类植物分类群。它们的生长习性主要为陆生（70%），水生（17%）和附生（13%）的较少。几乎没有记录到5种本地分类群，而之前记录的两种本地物种未被发现。我们认为，蓬塔拉拉保护区内蕨类植物和石松类植物种群面临的主要威胁是：因商业化而被采挖、外来物种入侵和气候波动（干旱期）。文中给出了分类群鉴定的检索表，并提出了保护受威胁分类群的策略。
