Demographic history and range modelling of the East Mediterranean Abies cilicica
The Mediterranean Basin is one of the 36 global hotspots of biodiversity and it is rich in endemic tree species. The complex geological history of the region throughout the Neogene and Quaternary periods that were marked with several palaeoclimatic transformations was a major factor triggering the g...
| 出版年: | Plant and Fungal Systematics |
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| 主要な著者: | , , , , , , , |
| フォーマット: | 論文 |
| 言語: | 英語 |
| 出版事項: |
W. Szafer Institute of Botany, Polish Academy of Sciences
2021-12-01
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| 主題: | |
| オンライン･アクセス: | https://pfsyst.botany.pl/Demographic-history-and-range-modelling-of-the-East-Mediterranean-Abies-cilicica,140229,0,2.html |
| 要約: | The Mediterranean Basin is one of the 36 global hotspots of biodiversity and
it is rich in endemic tree species. The complex geological history of the region throughout
the Neogene and Quaternary periods that were marked with several palaeoclimatic transformations
was a major factor triggering the genetic divergence of lineages in tree species in
the region. The ongoing global climate change is the main factor threatening Mediterranean
biodiversity. The risk of population decline related to aridization is the highest in the case of
endemics, especially for cold-adapted conifers, such as Abies cilicica . The Cilician fir grows
in the East Mediterranean mountains that constitute a local centre of endemism within the
region. The species range is fragmented and small-size populations prevail. Previous studies
have suggested that the last glacial cycle led to a significant reduction in the species range
and might have initiated genetic divergence. As a result, two lineages are currently recognized
at the subspecies level, A. cilicica subsp. isaurica (Turkey) and A. cilicica subsp. cilicica
(Turkey, Syria, and Lebanon). The predictions about the impact of future climate changes in
the East Mediterranean suggest a profound reduction of precipitation and overall warming
that may put the remnant populations of A. cilicica at a risk of decline. Here, we used the
Bayesian approach to investigate the demographic history of endemic A. cilicica . Specifically,
we estimated the probable time of the intraspecies divergence to verify previous assumptions
about the species’ evolutionary history. Additionally, niche modelling was used to outline
the potential range of changes in the past and to indicate glacial refugia in where the species
persisted climate crisis. This approach was also used to explore the possible influence of the
future climate changes on the distribution of A. cilicica in the region. Our results demonstrate
that the divergence between the Lebanese and the Turkish populations that occurred
~220 ka years BP coincided with the Riss glaciation. According to palaeoecological data, in
the East Mediterranean, that glacial period caused a severe reduction in the populations of
woody species due to the aridity of the climate. At that time, the Lebanese-Syrian part of the
range was likely disconnected from the main range. The second split was induced by the last
glacial cycle ~60 ka years BP and led to the separation of the Central Taurus and East Taurus
population and, consequently, to the formation of the two subspecies. Niche modelling for
the last glacial maximum has allowed us to locate the probable refugia for A. cilicica in the
western Anatolia and Syria-Lebanon area. A projection of the future possible distribution of
the species indicates a serious reduction of the range during this century. |
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| ISSN: | 2544-7459 2657-5000 |