Demographic processes in the montane Atlantic rainforest: Molecular and cytogenetic evidence from the endemic frog Proceratophrys boiei
Demographic processes in the montane Atlantic rainforest: Molecular and cytogenetic evidence from the endemic frog Proceratophrys boiei
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DOI：
10.1016/j.ympev.2011.11.004
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发表时间：
2012-03-01
影响因子：
4.1
通讯作者：
Carnaval, Ana Carolina
中科院分区：
文献类型：
--
作者：
Amaro, Renata Cecilia;Rodrigues, Miguel Trefaut;Carnaval, Ana Carolina
历史气候保护区预测了巴西大西洋雨林低地特有物种的遗传多样性。然而，现有数据揭示了不同海拔范围的物种对末次盛冰期（LGM）条件的不同生物反应。我们表明，与低地专家相比，占据巴西山地森林的物种受末次盛行条件的影响明显较小，但更新世前的构造极大地影响了它们的地理变化。我们的结论基于古气候分布模型、细胞色素 b、16S 和 RAG-1 基因的分子序列以及特有青蛙 Proceratophrys boiei 的核型数据。 DNA 和染色体数据在 P. boiei 中鉴定出至少两个广泛不同的系统群，但尚未在形态学上进行区分。细胞遗传学结果还表明圣保罗南部有一个杂交区域。系统发育断层的位置与西北-东南断层的位置大致相符，该断层在新近纪重新激活，导致巴西东南部的地貌发生显着变化。我们的结果指出了低地与山地热带类群多样性模式的不同机制，并帮助我们了解目前在南大西洋森林热点山地地区观察到的大量狭义特有种的过程。 (C) 2011 Elsevier Inc. 保留所有权利。
Historical climatic refugia predict genetic diversity in lowland endemics of the Brazilian Atlantic rainforest. Yet, available data reveal distinct biological responses to the Last Glacial Maximum (LGM) conditions across species of different altitudinal ranges. We show that species occupying Brazil's montane forests were significantly less affected by LGM conditions relative to lowland specialists, but that pre-Pleistocene tectonics greatly influenced their geographic variation. Our conclusions are based on palaeoclimatic distribution models, molecular sequences of the cytochrome b, 16S, and RAG-1 genes, and karyotype data for the endemic frog Proceratophrys boiei. DNA and chromosomal data identify in P. boiei at least two broadly divergent phylogroups, which have not been distinguished morphologically. Cytogenetic results also indicate an area of hybridization in southern Sao Paulo. The location of the phylogeographic break broadly matches the location of a NW-SE fault, which underwent reactivation in the Neogene and led to remarkable landscape changes in southeastern Brazil. Our results point to different mechanisms underpinning diversity patterns in lowland versus montane tropical taxa, and help us to understand the processes responsible for the large number of narrow endemics currently observed in montane areas of the southern Atlantic forest hotspot. (C) 2011 Elsevier Inc. All rights reserved.