Roads to isolation: Similar genomic history patterns in two species of freshwater crabs with contrasting environmental tolerances and range sizes

Ecology and Evolution
Ywee Chieh TayRudolf Meier

Abstract

Freshwater species often show high levels of endemism and risk of extinction owing to their limited dispersal abilities. This is exemplified by the stenotopic freshwater crab, Johora singaporensis which is one of the world's 100 most threatened species, and currently inhabits less than 0.01 km2 of five low order hill streams within the highly urbanized island city-state of Singapore. We compared populations of J. singaporensis with that of the non-threatened, widespread, abundant, and eurytopic freshwater crab, Parathelphusa maculata, and found surprisingly high congruence between their population genomic histories. Based on 2,617 and 2,470 genome-wide SNPs mined via the double-digest restriction-associated DNA sequencing method for ~90 individuals of J. singaporensis and P. maculata, respectively, the populations are strongly isolated (FST = 0.146-0.371), have low genetic diversity for both species (also for COI), and show signatures of recent genetic bottlenecks. The most genetically isolated populations for both species are separated from other populations by one of the oldest roads in Singapore. These results suggest that anthropogenic developments may have impacted stream-dependent species in a uniform manner, regardless o...Continue Reading

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Datasets Mentioned

BETA
MG010138

Methods Mentioned

BETA
Illumina sequencing
genotyping
PCR

Software Mentioned

sstacks
POPART
BEAST
NeEstimator
Adegenet
DnaSP
jModelTest
STRUCTURE HARVESTER
R package diveRsity
STACKS

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