3.9 C
Oxford
Friday, April 10, 2020
Home Journals Annals of Botany Effect of climatic fluctuations of the Quaternary on xeric flora

Effect of climatic fluctuations of the Quaternary on xeric flora

Quaternary glaciations strongly affected the distribution of species from arid and semi-arid environments, as temperature drops were accompanied by strong fluctuations in rainfall. In this study, Ossa and colleagues examined the response of xerophytic species to glacial cycles, determining the genetic patterns and climatic niche of Echinopsis chiloensis var. chiloensis, an endemic columnar cactus of arid and semi-arid regions of Chile.

Xeric flora

The authors found a decline in genetic diversity towards high latitudes and a significant IBD pattern that together with ENM predictions suggest that E. chiloensis var. chiloensis experienced range contraction northwards during wet–cold conditions of the LGM, followed by expansion during aridification of the mid-Holocene. In addition to IBD, they detected the presence of a strong barrier to gene flow at 32°30′S, which according to coalescence analysis occurred 44 kyr BP. The resulting genetic clusters differed in realized climatic niche, particularly in the variables related to precipitation.

Their results suggest that the cactus E. chiloensis var. chiloensis experienced range contraction and fragmentation during the wet–cold conditions of the LGM, which may have facilitated ecological differentiation between northern and southern populations, promoting incipient speciation.

Alex Assiryhttps://academic.oup.com/aob
Alex Assiry is an editorial assistant in the Annals of Botany Office. When not working, Alex listens for the opportunity to help.

Latest Articles

Most Popular

10 Plants Used to Spice up Sex

It's well-known that plants can affect how the brain works. Take the right plant in the right dose and you can have an altered...

Amazing moss and how to identify it

If I told you that during a 200m walk down a suburban London street I saw 13 different species from one group of organisms,...

Adapted to kill: How the pitcher plant traps its prey

When it comes to carnivorous plants it's Venus Flytraps that get the most attention, with their snapping jaws. Bladderworts have stunningly fast traps. Sundews...

Why small seeds require light to germinate

The influence of light on germination was much stronger in smaller than in larger seeds.

Recent Comments

>