Genomic Signatures of Local Adaptation in Clam Shrimp (Eulimnadia texana) from Natural Vernal Pools
| Autor: | James G. Baldwin-Brown, Anthony D. Long |
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| Rok vydání: | 2020 |
| Předmět: |
AcademicSubjects/SCI01140
Gene Flow Male animal structures ecological genetics natural selection and contemporary evolution population genetics: empirical New Mexico Population Adaptation Biological Zoology Metapopulation adaptation genomics/proteomics Crustacea Genetics Animals Hermaphroditic Organisms Selection Genetic education Ecosystem Ecology Evolution Behavior and Systematics Local adaptation Recombination Genetic education.field_of_study Genome biology AcademicSubjects/SCI01130 landscape genetics Sex Determination Processes biology.organism_classification Biological Evolution Eulimnadia texana Shrimp Clam shrimp Vernal pool Heterogametic sex Research Article |
| Zdroj: | Genome Biology and Evolution |
| ISSN: | 1759-6653 |
| Popis: | Vernal pools are unique in their isolation and the strong selection acting on their resident species. Vernal pool clam shrimp (Eulimnadia texana) are a promising model due to ease of culturing, short generation time, small genomes, and obligate desiccated diapaused eggs. Clam shrimp are also androdioecious (sexes include males and hermaphrodites), and here we use population-scaled recombination rates to support the hypothesis that the heterogametic sex is recombination free in these shrimp. We collected short-read sequence data from pooled samples from different vernal pools to gain insights into local adaptation. We identify genomic regions in which some populations have allele frequencies that differ significantly from the metapopulation. BayPass (Gautier M. 2015. Genome-wide scan for adaptive divergence and association with population-specific covariates. Genetics 201(4):1555–1579.) detected 19 such genomic regions showing an excess of population subdivision. These regions on average are 550 bp in size and had 2.5 genes within 5 kb of them. Genes located near these regions are involved in Malpighian tubule function and osmoregulation, an essential function in vernal pools. It is likely that salinity profiles vary between pools and over time, and variants at these genes are adapted to local salinity conditions. |
| Databáze: | OpenAIRE |
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