Extremely low genetic diversity across mangrove taxa reflects past sea level changes and hints at poor future responses

Global Change Biology
Zixiao GuoSuhua Shi

Abstract

The projected increases in sea levels are expected to affect coastal ecosystems. Tropical communities, anchored by mangrove trees and having experienced frequent past sea level changes, appear to be vibrant at present. However, any optimism about the resilience of these ecosystems is premature because the impact of past climate events may not be reflected in the current abundance. To assess the impact of historical sea level changes, we conducted an extensive genetic diversity survey on the Indo-Malayan coast, a hotspot with a large global mangrove distribution. A survey of 26 populations in six species reveals extremely low genome-wide nucleotide diversity and hence very small effective population sizes (Ne ) in all populations. Whole-genome sequencing of three mangrove species further shows the decline in Ne to be strongly associated with the speed of past changes in sea level. We also used a recent series of flooding events in Yalong Bay, southern China, to test the robustness of mangroves to sea level changes in relation to their genetic diversity. The events resulted in the death of half of the mangrove trees in this area. Significantly, less genetically diverse mangrove species suffered much greater destruction. The dieba...Continue Reading

References

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Citations

Nov 7, 2018·Genome Génome / Conseil National De Recherches Canada·Lu LiuSuhua Shi
Feb 10, 2021·G3 : Genes - Genomes - Genetics·Guillermo FriisJohn A Burt
Jul 13, 2021·Frontiers in Plant Science·Wuxia GuoYelin Huang

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