Testing the causes of richness patterns in the paleotropics: time and diversification in cycads (Cycadaceae)

Testing the causes of richness patterns in the paleotropics: time and diversification in cycads (Cycadaceae)
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测试古热带地区丰富度模式的原因:苏铁植物(苏铁科)的时间和多样化

DOI:
10.1111/ecog.05910
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发表时间:
2021-09
期刊:
影响因子:
5.9
通讯作者:
Gong Xun
Gong Xun
中科院分区:
环境科学与生态学1区
文献类型:
--
作者:
Liu Jian;Lindstrom Anders J.;Nagalingum Nathalie S.;Wiens John J.;Gong Xun

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古热带地区拥有许多生物多样性热点,并显示出许多不同的物种丰富度模式。然而,目前还不清楚哪些因素是最重要的直接塑造丰富的古热带地区之间的模式(即多样化率,殖民化时间和传播频率)。在这里,我们使用苏铁科作为一个模式系统,以测试在古热带地区的区域丰富度模式的原因。具体来说,我们测试的分散频率,殖民时间,多样化率的作用,以及它们的综合作用,在解释丰富的地区之间的模式。我们产生了一个良好的采样,时间校准的种群发生,然后用它来估计扩散事件,殖民化时间和多样化率。丰富的模式显着相关的每个区域的第一次殖民化的时间,最好的解释殖民化时间和多样化率的综合影响。进入各区域的扩散事件次数和各区域物种的多样性变化率与丰富度没有显著相关。沿海地区的重建表明,频繁的迁移横跨华莱士线,具有较高的多样化率的华莱士线以东比以西it.Overall,我们的研究表明,殖民时间可以解释区域丰富的古热带模式的一个重要因素。
The paleotropics harbor many biodiversity hotspots and show many different species richness patterns. However, it remains unclear which factors are the most important in directly shaping richness patterns among regions in the paleotropics (i.e. diversification rates, colonization times, and dispersal frequency). Here we used Cycadaceae as a model system to test the causes of regional richness patterns in the paleotropics. Specifically, we tested the roles of dispersal frequency, colonization time, diversification rates, and their combined role in explaining richness patterns among regions. We generated a well-sampled, time-calibrated phylogeny and then used this to estimate dispersal events, colonization times, and diversification rates. Richness patterns were significantly associated with the timing of the first colonization of each region and were best explained by the combined effects of colonization time and diversification rates. The number of dispersal events into each region and the diversification rates of species in each region were not significantly related to richness. Ancestral-area reconstructions showed frequent migrations across Wallace’s line, with a higher diversification rate east of Wallace’s line than west of it. Overall, our study shows that colonization time can be an important factor for explaining regional richness patterns in the paleotropics.
DOI: 10.1086/345091
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影响因子: --
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