Species-Area Relationships Induced by Forest Habitat Fragmentation Apply Even to Rarely Detected Organisms

IF 1.7 4区 环境科学与生态学 Q2 BIODIVERSITY CONSERVATION Tropical Conservation Science Pub Date : 2021-01-01 DOI:10.1177/19400829211017366
A. Palmeirim, R. Fraga, M. Vieira, C. Peres
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Abstract

Neotropical snakes have extremely low detection rates, hampering our understanding of their responses to habitat loss and fragmentation. We addressed this gap using a limited sample (50 individuals, 16 species) across 25 variable-size insular forest fragments within a hydroelectric lake and four adjacent mainland continuous forest sites, in Central Brazilian Amazonia. The number of species recorded on forest islands (1.55 ± 0.78) was much lower than that at continuous forest sites (5.0 ± 3.1), with no snakes being recorded at twelve islands smaller than 30 ha. As such, snake assemblages were positively affected by forest area, explaining 48% of the number of species, and negatively affected by island isolation. The markedly higher number of species recorded across continuous forest sites likely results from the availability of riparian habitats, which have virtually disappeared from the archipelagic landscape given the widespread inundation of lowland areas. To prevent further severe biodiversity loss, including those of poorly known rare taxa, conservation policies should avert the additional construction of mega-dams that create myriad of small islands, in addition to extensive reservoir lakes from which all riparian habitats are eliminated.
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森林生境破碎化诱导的物种-面积关系甚至适用于很少被发现的生物
新热带蛇的检测率极低,阻碍了我们对它们对栖息地丧失和破碎化的反应的理解。我们使用有限的样本(50个个体,16个物种)来解决这一差距,样本分布在巴西中部亚马逊地区的一个水电湖中的25个可变大小的岛屿森林碎片和四个相邻的大陆连续森林遗址中。森林岛屿上记录的物种数量(1.55±0.78)远低于连续森林遗址上记录的数量(5.0±3.1),在12个小于30公顷的岛屿上没有记录到蛇。因此,蛇的群落受到森林面积的积极影响,解释了48%的物种数量,而受到岛屿隔离的负面影响。连续森林地区记录的物种数量明显增加,可能是由于河岸栖息地的可用性,鉴于低地地区的广泛淹没,河岸栖息地几乎已经从群岛景观中消失。为了防止生物多样性进一步严重丧失,包括那些鲜为人知的稀有类群的生物多样性丧失,保护政策应该避免额外建造巨型水坝,这些水坝会造成无数小岛,此外,还应该避免建造大量的水库湖,所有河岸栖息地都会从中消失。
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来源期刊
Tropical Conservation Science
Tropical Conservation Science BIODIVERSITY CONSERVATION-
CiteScore
3.60
自引率
5.90%
发文量
16
审稿时长
>12 weeks
期刊介绍: Tropical Conservation Science is a peer-reviewed, open access journal that publishes original research papers and state-of-the-art reviews of broad interest to the field of conservation of tropical forests and of other tropical ecosystems.
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