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Dynamic reticulate evolution in a Daphnia multispecies complex.
J Exp Zool A Ecol Genet Physiol. 2009 Aug 01; 311(7):530-48.JE

Abstract

Recent genomic data suggest that the role of hybridization in evolution might be more important than previously assumed. Here, we examine species-specific differentiation and signatures of reticulation in a multi-species complex of the crustacean genus Daphnia. We did a combined examination of mtDNA, allozymes and ITS1 (a part of the nuclear ribosomal DNA) in the Daphnia longispina group. We focused on the sequence variation of ITS1 in two unambiguous species (D. galeata, D. cucullata) and two ecotypes hyalina and rosea within the recently revised taxon D. longispina (O.F. Müller). We found two ITS1-types (S, L) and intra-individual and intra-specific polymorphisms. Another ITS1-type (XL) was restricted to the outgroup D. umbra. S was present in all taxa but occurred as only two variants. Surprisingly, D. galeata and D. cucullata, which were well differentiated by mtDNA and allozymes, were virtually indistinguishable with respect to S-ITS1 (S(cg)). The two ecotypes of D. longispina shared the second S-ITS1-variant (S(rh)) and were therefore almost indistinguishable for all types of molecular markers surveyed. The L-type differed between D. galeata and D. longispina samples, but L was absent in D. cucullata. Between hyalina and rosea ecotypes, we found some L-differentiation. Combined data suggest that reticulate evolution enabled the spread of one S-ITS1-variant (S(cg)) beyond species boundaries and that S-introgression was species-specific, despite contemporary hybridization between all species. Our data have implications for phylogenetic as well as phylogeographic surveys. Because of the dynamic impact of gene flow in multi-species complexes, misinterpretations of presumed species-specific data should be considered.

Authors+Show Affiliations

Ludwig-Maximilians-Universität München, Department Biologie II, Evolutionary Ecology, Planegg-Martinsried, Germany.No affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19484710

Citation

Giessler, Sabine, and Claudia C. Englbrecht. "Dynamic Reticulate Evolution in a Daphnia Multispecies Complex." Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology, vol. 311, no. 7, 2009, pp. 530-48.
Giessler S, Englbrecht CC. Dynamic reticulate evolution in a Daphnia multispecies complex. J Exp Zool A Ecol Genet Physiol. 2009;311(7):530-48.
Giessler, S., & Englbrecht, C. C. (2009). Dynamic reticulate evolution in a Daphnia multispecies complex. Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology, 311(7), 530-48. https://doi.org/10.1002/jez.550
Giessler S, Englbrecht CC. Dynamic Reticulate Evolution in a Daphnia Multispecies Complex. J Exp Zool A Ecol Genet Physiol. 2009 Aug 1;311(7):530-48. PubMed PMID: 19484710.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Dynamic reticulate evolution in a Daphnia multispecies complex. AU - Giessler,Sabine, AU - Englbrecht,Claudia C, PY - 2009/6/2/entrez PY - 2009/6/2/pubmed PY - 2009/9/18/medline SP - 530 EP - 48 JF - Journal of experimental zoology. Part A, Ecological genetics and physiology JO - J Exp Zool A Ecol Genet Physiol VL - 311 IS - 7 N2 - Recent genomic data suggest that the role of hybridization in evolution might be more important than previously assumed. Here, we examine species-specific differentiation and signatures of reticulation in a multi-species complex of the crustacean genus Daphnia. We did a combined examination of mtDNA, allozymes and ITS1 (a part of the nuclear ribosomal DNA) in the Daphnia longispina group. We focused on the sequence variation of ITS1 in two unambiguous species (D. galeata, D. cucullata) and two ecotypes hyalina and rosea within the recently revised taxon D. longispina (O.F. Müller). We found two ITS1-types (S, L) and intra-individual and intra-specific polymorphisms. Another ITS1-type (XL) was restricted to the outgroup D. umbra. S was present in all taxa but occurred as only two variants. Surprisingly, D. galeata and D. cucullata, which were well differentiated by mtDNA and allozymes, were virtually indistinguishable with respect to S-ITS1 (S(cg)). The two ecotypes of D. longispina shared the second S-ITS1-variant (S(rh)) and were therefore almost indistinguishable for all types of molecular markers surveyed. The L-type differed between D. galeata and D. longispina samples, but L was absent in D. cucullata. Between hyalina and rosea ecotypes, we found some L-differentiation. Combined data suggest that reticulate evolution enabled the spread of one S-ITS1-variant (S(cg)) beyond species boundaries and that S-introgression was species-specific, despite contemporary hybridization between all species. Our data have implications for phylogenetic as well as phylogeographic surveys. Because of the dynamic impact of gene flow in multi-species complexes, misinterpretations of presumed species-specific data should be considered. SN - 1932-5223 UR - https://www.unboundmedicine.com/medline/citation/19484710/Dynamic_reticulate_evolution_in_a_Daphnia_multispecies_complex_ L2 - https://doi.org/10.1002/jez.550 DB - PRIME DP - Unbound Medicine ER -