The genus Cycas (Cycadaceae) in Indonesia

Lindström, Anders J.; Hill, Kathryn; Stanberg, Leonie

doi:10.7751/telopea20095826

Cited by 19 publications

(17 citation statements)

References 30 publications

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“…For the remaining two sections, Wadeae is a relictual section endemic to Philippines (Lindstrom et al, 2008). The full range of the section Cycas is from India and southern Indochina south to Australia and from East Africa east to Tonga (Lindstrom & Hill, 2007;Lindstrom et al, 2009…”

Section: The Distribution Of Cycasmentioning

confidence: 99%

“…Six classification sections are now recognized in the genus Cycas (Table ): four in Hill (), an additional one in Lindstrom, Hill, and Stanberg () and another one in Lindstrom, Hill, and Stanberg (). According to Hill (), 17 species from section Stangerioides distributed in China and C. multifrondis D. Yue Wang was treated as hybrid swarm of C. dolichophylla K.D.…”

Section: Current Status Of Cycasmentioning

confidence: 99%

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The distribution, diversity, and conservation status of Cycas in China

Liu

Feng

Gong

2017

Ecology and Evolution

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As ancient gymnosperm and woody plants, cycads have survived through dramatic tectonic activities, climate fluctuation, and environmental variations making them of great significance in studying the origin and evolution of flora biodiversity. However, they are among the most threatened plant groups in the world. The principal aim of this review is to outline the distribution, diversity, and conservation status of Cycas in China and provide suggestions for conservation practices. In this review, we describe the taxonomy, distribution, and conservation status of Cycas in China. By comparing Chinese Cycas species with its relatives worldwide, we then discuss the current genetic diversity, genetic differentiation of Cycas, and try to disentangle the potential effects of Quaternary climate changes and topographical events on Cycas. We review conservation practices from both researchers and practitioners for these rare and endangered species. High genetic diversity at the species level and strong genetic differentiation within Cycas have been observed. Most Cycas species in southwest China have experienced population retreats in contrast to the coastal Cycas's expansion during the Quaternary glaciation. Additionally, human activities and habitat fragmentation have pushed these endangered taxa to the brink of extinction. Although numerous efforts have been made to mitigate threats to Cycas survival, implementation and compliance monitoring in protection zones are currently inadequate. We outline six proposals to strengthen conservation measures for Cycas in China and anticipate that these measures will provide guidelines for further research on population genetics as well as conservation biology of not only cycads but also other endangered species worldwide.

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Section: The Distribution Of Cycasmentioning

confidence: 99%

Section: Current Status Of Cycasmentioning

confidence: 99%

The distribution, diversity, and conservation status of Cycas in China

Liu

Feng

Gong

2017

Ecology and Evolution

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“…In addition, multiple extant Asian cycad species, including C. taitungensis , are allopatric and restrictedly distributed with small population sizes [36–40] and is considered as relicts from glacial refugia [8]. The small population size and geographic isolation from other populations increase the effect of genetic drift resulting in species divergence.…”

Section: Discussionmentioning

confidence: 99%

Asymmetric Introgression in the Horticultural Living Fossil Cycas Sect. Asiorientales Using a Genome-Wide Scanning Approach

Chiang

Huang

Chang

et al. 2013

IJMS

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The Asian cycads are mostly allopatric, distributed in small population sizes. Hybridization between allopatric species provides clues in determining the mechanism of species divergence. Horticultural introduction provides the chance of interspecific gene flow between allopatric species. Two allopatrically eastern Asian Cycas sect. Asiorientales species, C. revoluta and C. taitungensis, which are widely distributed in Ryukyus and Fujian Province and endemic to Taiwan, respectively, were planted in eastern Taiwan for horticultural reason. Higher degrees of genetic admixture in cultivated samples than wild populations in both cycad species were detected based on multilocus scans by neutral AFLP markers. Furthermore, bidirectional but asymmetric introgression by horticultural introduction of C. revoluta is evidenced by the reanalyses of species associated loci, which are assumed to be diverged after species divergence. Partial loci introgressed from native cycad to the invaders were also detected at the loci of strong species association. Consistent results tested by all neutral loci, and the species-associated loci, specify the recent introgression from the paradox of sharing of ancestral polymorphisms. Phenomenon of introgression of cultivated cycads implies niche conservation among two geographic-isolated cycads, even though the habitats of the extant wild populations of two species are distinct.

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“…For example, studies have suggested that Borneo has high biodiversity and endemism because it is a 'cradle' for diversification (Klaus et al 2013, Grismer et al 2016, Williams et al 2017). However, Borneo has only a single Cycas species, the coastally distributed C. edentata (Lindstrom et al 2009). This species arose from dispersal in the last one million years (Fig.…”

Section: The Impact Of Time and Diversification Rates On Richness Patternsmentioning

confidence: 99%

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

et al. 2021

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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.

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The genus Cycas (Cycadaceae) in Indonesia

Cited by 19 publications

References 30 publications

The distribution, diversity, and conservation status of Cycas in China

The distribution, diversity, and conservation status of Cycas in China

Asymmetric Introgression in the Horticultural Living Fossil Cycas Sect. Asiorientales Using a Genome-Wide Scanning Approach

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

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