Crystalline rock outcrops in the Atlantic Forest of northeastern Brazil: vascular flora, biological spectrum, and invasive species
Crystalline rock outcrops in the Atlantic Forest of northeastern Brazil: vascular flora, biological spectrum, and invasive species
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DOI：
10.1007/s40415-013-0020-7
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发表时间：
2013-06-01
影响因子：
1.6
通讯作者：
Sobral-Leite, Marcelo
中科院分区：
文献类型：
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作者：
Gomes, Polyhanna;Sobral-Leite, Marcelo
我们研究了巴西东北部大西洋森林中两个结晶岩露头的植被。我们记录了典型的岩生物种，这是罕见的或被列为极度濒危，如Aechmea guainumbiorum，只发现在一个研究地点。在这两个地区有一年生植物占主导地位的其他生命形式，在南大西洋森林的岩石露头的观察。一年生植物也在与我们研究地点纬度相似的其他岩石露头中脱颖而出，无论周围的植被如何。其他生活型植物的丰富度明显较低，表现出对干旱的适应性，如肉质茎、假鳞茎、密毛和地下贮藏器官。我们的研究结果表明，入侵物种可能会改变结晶岩露头的植被，因为它们改变了所有生命形式的物种数量，在网站之间的比较。因此，我们的研究结果提出了这些岩栖栖息地，这是边缘的森林的生物特性，并指出需要保护它们，以保护大西洋森林的生物多样性。
We studied the vegetation of two crystalline rock outcrops in the Atlantic Forest of northeastern Brazil. We recorded typically rupicolous species, which are rare or classified as extremely endangered, such as Aechmea guainumbiorum, found exclusively in one of the study sites. In both areas there was a predominance of therophytes over other life-forms, in contrast to observations made in rock outcrops of the southern Atlantic Forest. Therophytes also stood out in other rock outcrops at similar latitudes as our study site, regardless of the surrounding vegetation. Plants of other life-forms had significantly lower richness and showed adaptations to drought, such as succulent stem, pseudobulbs, dense pilosity, and underground storage organs. Our results suggest that invasive species may modify the vegetation of crystalline rock outcrops, as they change the number of species of all lifeforms in comparison between sites. Hence, our results present the biological identity of these rupicolous habitats, which are marginal to forests, and point to the need for conserving them, in order to protect the Atlantic Forest's biodiversity.