Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Mitochondrial capture misleads about ecological speciation in the Daphnia pulex complex |
| Abstract | The North American ecological species Daphnia pulicaria and Daphnia pulex are thought to have diverged from a common ancestor by adaptation to sympatric but ecologically distinct lake and pond habitats respectively. Based on mtDNA relationships, European D. pulicaria is considered a different species only distantly related to its North American counterpart, but both species share a lactate dehydrogenase (Ldh) allele F supposedly involved in lake adaptation in North America, and the same allele is also carried by the related Holarctic Daphnia tenebrosa. The correct inference of the species' ancestral relationships is therefore critical for understanding the origin of their adaptive divergence. Our species tree inferred from unlinked nuclear loci for D. pulicaria and D. pulex resolved the European and North American D. pulicaria as sister clades, and we argue that the discordant mtDNA gene tree is best explained by capture of D. pulex mtDNA by D. pulicaria in North America. The Ldh gene tree shows that F-class alleles in D. pulicaria and D. tenebrosa are due to common descent (as opposed to introgression), with D. tenebrosa alleles paraphyletic with respect to D. pulicaria alleles. That D. tenebrosa still segregates the ancestral and derived amino acids at the two sites distinguishing the pond and lake alleles suggests that D. pulicaria inherited the derived states from the D. tenebrosa ancestry. Our results suggest that some adaptations restricting the gene flow between D. pulicaria and D. pulex might have evolved in response to selection in ancestral environments rather than in the species' current sympatric habitats. The Arctic (D. tenebrosa) populations are likely to provide important clues about these issues. |
| Source | PloS one 8 (7) |
| Keywords | DNA VariationPopulationsArctic Daphnia |
| Journal | PloS one |
| Editor | Public Library of Science, San Francisco, CA, Stati Uniti d'America |
| Year | 2013 |
| Type | Articolo in rivista |
| DOI | 10.1371/journal.pone.0069497 |
| Authors | Markova, Silvia; France Dufresne; Marina Manca; Petr Kotlik |
| Text | 308942 2013 10.1371/journal.pone.0069497 ISI Web of Science WOS 000323110600044 DNA Variation Populations Arctic Daphnia Mitochondrial capture misleads about ecological speciation in the Daphnia pulex complex Markova, Silvia; France Dufresne; Marina Manca; Petr Kotlik Markova, Silvia Acad Sci Czech Republic, Lab Mol Ecol, Inst Anim Physiol Genet, Libechov, Czech Republic; Dufresne, France Affiliazione altro Univ Quebec Rimouski, Dept Biol, Ctr Etud Nord, Quebec City, PQ, Canada; Manca, Marina CNR ISE, Pallanza Verbania; Kotlik, Petr Acad Sci Czech Republic, Lab Mol Ecol, Inst Anim Physiol Genet, Libechov, Czech Republic The North American ecological species Daphnia pulicaria and Daphnia pulex are thought to have diverged from a common ancestor by adaptation to sympatric but ecologically distinct lake and pond habitats respectively. Based on mtDNA relationships, European D. pulicaria is considered a different species only distantly related to its North American counterpart, but both species share a lactate dehydrogenase Ldh allele F supposedly involved in lake adaptation in North America, and the same allele is also carried by the related Holarctic Daphnia tenebrosa. The correct inference of the species ancestral relationships is therefore critical for understanding the origin of their adaptive divergence. Our species tree inferred from unlinked nuclear loci for D. pulicaria and D. pulex resolved the European and North American D. pulicaria as sister clades, and we argue that the discordant mtDNA gene tree is best explained by capture of D. pulex mtDNA by D. pulicaria in North America. The Ldh gene tree shows that F class alleles in D. pulicaria and D. tenebrosa are due to common descent as opposed to introgression , with D. tenebrosa alleles paraphyletic with respect to D. pulicaria alleles. That D. tenebrosa still segregates the ancestral and derived amino acids at the two sites distinguishing the pond and lake alleles suggests that D. pulicaria inherited the derived states from the D. tenebrosa ancestry. Our results suggest that some adaptations restricting the gene flow between D. pulicaria and D. pulex might have evolved in response to selection in ancestral environments rather than in the species current sympatric habitats. The Arctic D. tenebrosa populations are likely to provide important clues about these issues. 8 Published version Articolo 2013_Plos_one_8_12 0.pdf Articolo in rivista Public Library of Science 1932 6203 PloS one PloS one PLoS ONE PloS one Public Library of Science one PLoS 1 marinamarcella.manca MANCA MARINA MARCELLA TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici |