Data from: Characterising a hybrid zone between a cryptic species pair of freshwater snails
Data files
Dec 23, 2014 version files 2.54 MB
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act1a_aln.fas
104.53 KB
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climate_data.txt
16.45 KB
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co1_outgroups_aln.meg
468.65 KB
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hasp2_aln.fas
138.06 KB
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POPS_geo_dist_circle
761.09 KB
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POPS_input.txt
42.04 KB
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POPS_predictionfile.txt
14.94 KB
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psmd2_aln.fas
85.17 KB
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README_for_act1a_aln.txt
499 B
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README_for_climate_data.txt
854 B
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README_for_co1_outgroups_aln.txt
633 B
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README_for_hasp2_aln.txt
612 B
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README_for_POPS_geo_dist_circle.txt
493 B
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README_for_POPS_input.txt
2.41 KB
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README_for_POPS_predictionfile.txt
1.58 KB
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README_for_psmd2_aln.txt
622 B
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README_for_structure_input.txt
2.70 KB
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structure_input.txt
39.37 KB
Abstract
Characterising hybrid zones and their dynamics is a central goal in evolutionary biology, but this is particularly challenging for morphologically cryptic species. The lack of conspicuous divergence between parental types means intermediate hybrid forms often go undetected. We aimed to detect and characterise a suspected hybrid zone between a pair of morphologically cryptic lineages of the freshwater snail, Radix. We sampled Radix from across a contact zone between two mitochondrial lineages (Radix balthica and an undescribed lineage termed MOTU3) and detected admixture between two nuclear genotype clusters, which were significantly but not categorically associated with the mitochondrial lineages. In a model selection approach, we show that the admixture cline is best explained by an interaction between precipitation and temperature gradients over the area, rather than geographic distance. We thus hypothesise that the correlation with climatic gradients suggests environmental selection has played a role in maintaining the hybrid zone. In a 2050 climate change scenario, we furthermore predict an expansion of one of the nuclear clusters and a widening of the hybrid zone as the climate warms and dries.