The effect of habitat fragmentation on communities of mutualists: Amazonian ants and their host plants
The effect of habitat fragmentation on communities of mutualists: Amazonian ants and their host plants
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DOI：
10.1016/j.biocon.2005.01.026
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发表时间：
2005-07-01
影响因子：
5.9
通讯作者：
Heredia, S
中科院分区：
文献类型：
--
作者：
Bruna, EM;Vasconcelos, HL;Heredia, S
分裂对互惠伙伴群落的影响在很大程度上是未知的；此外，大多数针对这一问题的研究都是在植物授粉群落上进行的。我们评估了亚马逊低地热带雨林试验性的碎片化对蚂蚁-植物互惠共生群落的影响。我们在四个片断和四个连续的森林地点共记录了1057种真菌，所记录的12种植物被33个形态种占据，其中11个是专性植物居住种。森林片断的植物物种丰富度、蚂蚁物种丰富度和蚂蚁植物总密度都没有显著降低。然而，8种植物，包括四种最常见的植物中的三种，在连续森林中的平均密度高于片断。在这四种植物中，只有一种(Cordia Nodosa)在不同生境类型之间的定殖率有显著差异，植物碎片定殖率较高。这可能是因为阿兹特卡物种与森林隔离物种数量的增加有关。尽管我们的结果表明，在碎片分离25年后，蚂蚁-植物互助者的群落可能会在支离破碎的热带景观中持续存在，但大多数物种都很罕见，碎片中的种群规模极低。因此，环境和人口的随机性可能会限制人口的长期生存能力。我们建议未来的研究重点是评估碎片如何改变食草动物的压力以及蚂蚁和植物向碎片的扩散，因为这些因素可能相互作用。对人口持续存在的长期模式产生最大影响。(C)2005爱思唯尔有限公司。保留所有权利。
The consequences of fragmentation for communities of mutualist partners are for the most part unknown; moreover, most studies addressing this issue have been conducted on plant-pollinator communities. We evaluated how the experimental fragmentation of lowland Amazonian rain forest influenced a community of ant-plant mutualists. We inventoried a total of 1057 myrmecophytes in four fragments and four continuous forest sites; the twelve plant species recorded were occupied by 33 ant morphospecies, of which 11 were obligate plant inhabitants. Neither plant species richness, ant species richness, nor total ant-plant density were significantly lower in forest fragments. However, eight of the plant species, including three of the four most common, had higher mean densities in continuous forest than fragments. Of these four species, only one (Cordia nodosa) had significantly different colonization rates between habitat types, with higher colonization rates of plants in fragments. This may be because the Azteca species it is associated with increases in abundance in forest isolates. Although our results suggest that communities of ant-plant mutualists are likely to persist in fragmented tropical landscapes 25 years after fragment isolation, most species are rare and populations sizes in fragments are extremely low. Environmental and demographic stochasticity could therefore limit long-term population viability. We suggest future studies focus on evaluating how fragmentation has altered herbivore pressure and the dispersal of ants and plants to fragments, since the interaction of these factors is likely. to have the greatest impact on long-term patterns of population persistence. (c) 2005 Elsevier Ltd. All rights reserved.