12/22/2023 0 Comments Bi fact table timeslice![]() At least three different biogeographical patterns have been revealed. The origins and dispersal patterns of NH temperate plants have been investigated extensively and attracted the attention of numerous botanists for many years ( Donoghue and Li, 2001 Donoghue and Smith, 2004). More case studies need to be implemented to better understand the causes of diversification in the QTP region. Most biogeographical studies on taxa having their centre of diversity in the QTP region so far have focused on endemic clades or have suffered from biased sampling towards Tibetan taxa, as reviewed by Favre et al. ![]() Research investigating the two theories for species-rich plant groups in the QTP region may thus enrich our understanding of the evolutionary origins of biodiversity ( Myers et al., 2000). Lineage persistence (the museum theory) as well as explosive radiation theory have also been reported for many plant groups such as Gentiana ( Favre et al., 2016), Rhodiola ( Zhang et al., 2014) and Saxifraga ( Ebersbach et al., 2016). Local vicariance, secondary contact and ecological speciation events triggered by extensive uplifts of the QTP accompanying climatic fluctuations were proposed as important mechanisms ( Liu et al., 2006, 2014 Wen et al., 2014 Mosbrugger et al., 2018). Elucidating the mechanisms driving plant speciation in this region is of great interest and several spectacular radiations have been reported, involving multiple mechanisms of adaptive radiation ( Wen et al., 2014). ![]() Therefore, the QTP region, including the Himalaya–Hengduan Mountains (HHM) region in the south and south-east, has been considered the most important hotspot of biodiversity in the North Hemisphere (NH) ( Myers et al., 2000 Marchese, 2015). Gentiana and Rhodiola), exceptional species richness and a high level of endemism harboured in the QTP and adjacent areas ( Li and Li, 1993 Wu, 1998 Sun et al., 2012 Zhang et al., 2014 Favre et al., 2015, 2016). This orogeny reportedly promoted the diversification of numerous Tibetan organisms (i.e. Since the Cretaceous, one of the most remarkable geological changes in Eurasia has been uplift of the Qinghai–Tibet Plateau (QTP), starting in the early Cenozoic, before the collision of India with Asia ( Rowley & Currie, 2006 Royden et al., 2008 Lippert et al., 2014 Renner, 2016 Deng et al., 2017). Organismic and environmental processes play a major role in organismal evolution ( Richardson et al., 2001 Mao et al., 2012).
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