Dataset
Data from: Genome-wide SNP data reveal cryptic phylogeographic structure and microallopatric divergence in a rapids-adapted clade of cichlids from the Congo River
22 Dec 2016
Abstract
The lower Congo River (LCR) is a freshwater biodiversity hotspot in Africa
characterized by some of the world's largest rapids. However, little
is known about the evolutionary forces shaping this diversity, which
include numerous endemic fishes. We investigated phylogeographic
relationships in Teleogramma, a small clade of rheophilic cichlids, in the
context of regional geography and hydrology. Previous studies have been
unable to resolve phylogenetic relationships within Teleogramma due to
lack of variation in nuclear genes and discrete morphological characters
among putative species. To sample more broadly across the genome we
analyzed double-digest restriction-associated sequencing (ddRAD) data from
53 individuals across all described species in the genus. We also assessed
body shape and mitochondrial variation within and between taxa.
Phylogenetic analyses reveal previously unrecognized lineages and
instances of microallopatric divergence across as little as ~1.5 km.
Species ranges appear to correspond to geographic regions broadly
separated by major hydrological and topographic barriers, indicating these
features are likely important drivers of diversification. Mitonuclear
discordance indicates one or more introgressive hybridization events, but
no clear evidence of admixture is present in nuclear genomes, suggesting
these events were likely ancient. A survey of female fin patterns hints
that previously undetected lineage-specific patterning may be acting to
reinforce species cohesion. These analyses highlight the importance of
hydrological complexity in generating diversity in certain freshwater
systems, as well as the utility of ddRAD-Seq data in understanding
diversification processes operating both below and above the species
level.
Metrics
10 Record Views
Details
- Title
- Data from: Genome-wide SNP data reveal cryptic phylogeographic structure and microallopatric divergence in a rapids-adapted clade of cichlids from the Congo River
- Creators
- S. Elizabeth Alter - Queens College, CUNYJason Munshi-South - Fordham UniversityM.L.J. Stiassny - American Museum of Natural History
- Publisher
- Dryad
- Resource Type
- Dataset
- Language
- English
- Academic Unit
- Biodiversity, Earth, and Environmental Science (BEES)
- Other Identifier
- 991021904448404721