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Invasion of novel habitats uncouples haplo-diplontic life cycles.
Mol Ecol. 2016 Aug; 25(16):3801-16.ME

Abstract

Baker's Law predicts uniparental reproduction will facilitate colonization success in novel habitats. While evidence supports this prediction among colonizing plants and animals, few studies have investigated shifts in reproductive mode in haplo-diplontic species in which both prolonged haploid and diploid stages separate meiosis and fertilization in time and space. Due to this separation, asexual reproduction can yield the dominance of one of the ploidy stages in colonizing populations. We tested for shifts in ploidy and reproductive mode across native and introduced populations of the red seaweed Gracilaria vermiculophylla. Native populations in the northwest Pacific Ocean were nearly always attached by holdfasts to hard substrata and, as is characteristic of the genus, haploid-diploid ratios were slightly diploid-biased. In contrast, along North American and European coastlines, introduced populations nearly always floated atop soft-sediment mudflats and were overwhelmingly dominated by diploid thalli without holdfasts. Introduced populations exhibited population genetic signals consistent with extensive vegetative fragmentation, while native populations did not. Thus, the ecological shift from attached to unattached thalli, ostensibly necessitated by the invasion of soft-sediment habitats, correlated with shifts from sexual to asexual reproduction and slight to strong diploid bias. We extend Baker's Law by predicting other colonizing haplo-diplontic species will show similar increases in asexuality that correlate with the dominance of one ploidy stage. Labile mating systems likely facilitate colonization success and subsequent range expansion, but for haplo-diplontic species, the long-term eco-evolutionary impacts will depend on which ploidy stage is lost and the degree to which asexual reproduction is canalized.

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Authors+Show Affiliations

Krueger-Hadfield SA
Grice Marine Laboratory, College of Charleston, 205 Fort Johnson Rd, Charleston, SC, 29412, USA. Department of Biology, College of Charleston, 66 George St., Charleston, SC, 29424, USA.
Kollars NM
Grice Marine Laboratory, College of Charleston, 205 Fort Johnson Rd, Charleston, SC, 29412, USA. Department of Biology, College of Charleston, 66 George St., Charleston, SC, 29424, USA.
Byers JE
Odum School of Ecology, University of Georgia, 130 E. Green St., Athens, GA, 30602, USA.
Greig TW
NOAA/National Ocean Service, Center for Coastal Environmental Health and Biomolecular Research, 219 Fort Johnson Rd, Charleston, SC, 29312, USA.
Hammann M
GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Düsternbrooker Weg 20, D-23105, Kiel, Germany.
Murray DC
Grice Marine Laboratory, College of Charleston, 205 Fort Johnson Rd, Charleston, SC, 29412, USA.
Murren CJ
Department of Biology, College of Charleston, 66 George St., Charleston, SC, 29424, USA.
Strand AE
Grice Marine Laboratory, College of Charleston, 205 Fort Johnson Rd, Charleston, SC, 29412, USA. Department of Biology, College of Charleston, 66 George St., Charleston, SC, 29424, USA.
Terada R
Department of Fisheries, Kagoshima University, Shimoarata 3-50-20, Kagoshima City, 890-0056, Japan.
Weinberger F
GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel, Düsternbrooker Weg 20, D-23105, Kiel, Germany.
Sotka EE
Grice Marine Laboratory, College of Charleston, 205 Fort Johnson Rd, Charleston, SC, 29412, USA. Department of Biology, College of Charleston, 66 George St., Charleston, SC, 29424, USA.

MeSH

Biological EvolutionDiploidyEcosystemGenetics, PopulationGracilariaHaploidyPacific Ocean

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27286564

Citation

Krueger-Hadfield, Stacy A., et al. "Invasion of Novel Habitats Uncouples Haplo-diplontic Life Cycles." Molecular Ecology, vol. 25, no. 16, 2016, pp. 3801-16.
Krueger-Hadfield SA, Kollars NM, Byers JE, et al. Invasion of novel habitats uncouples haplo-diplontic life cycles. Mol Ecol. 2016;25(16):3801-16.
Krueger-Hadfield, S. A., Kollars, N. M., Byers, J. E., Greig, T. W., Hammann, M., Murray, D. C., Murren, C. J., Strand, A. E., Terada, R., Weinberger, F., & Sotka, E. E. (2016). Invasion of novel habitats uncouples haplo-diplontic life cycles. Molecular Ecology, 25(16), 3801-16. https://doi.org/10.1111/mec.13718
Krueger-Hadfield SA, et al. Invasion of Novel Habitats Uncouples Haplo-diplontic Life Cycles. Mol Ecol. 2016;25(16):3801-16. PubMed PMID: 27286564.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Invasion of novel habitats uncouples haplo-diplontic life cycles. AU - Krueger-Hadfield,Stacy A, AU - Kollars,Nicole M, AU - Byers,James E, AU - Greig,Thomas W, AU - Hammann,Mareike, AU - Murray,David C, AU - Murren,Courtney J, AU - Strand,Allan E, AU - Terada,Ryuta, AU - Weinberger,Florian, AU - Sotka,Erik E, Y1 - 2016/07/09/ PY - 2015/12/15/received PY - 2016/03/23/revised PY - 2016/05/20/accepted PY - 2016/6/11/entrez PY - 2016/6/11/pubmed PY - 2017/11/10/medline KW - Baker's Law KW - Gracilaria KW - biological invasion KW - biphasic life cycle KW - fragmentation KW - haploid-diploid KW - population genetics KW - seaweed KW - uniparental reproduction SP - 3801 EP - 16 JF - Molecular ecology JO - Mol Ecol VL - 25 IS - 16 N2 - Baker's Law predicts uniparental reproduction will facilitate colonization success in novel habitats. While evidence supports this prediction among colonizing plants and animals, few studies have investigated shifts in reproductive mode in haplo-diplontic species in which both prolonged haploid and diploid stages separate meiosis and fertilization in time and space. Due to this separation, asexual reproduction can yield the dominance of one of the ploidy stages in colonizing populations. We tested for shifts in ploidy and reproductive mode across native and introduced populations of the red seaweed Gracilaria vermiculophylla. Native populations in the northwest Pacific Ocean were nearly always attached by holdfasts to hard substrata and, as is characteristic of the genus, haploid-diploid ratios were slightly diploid-biased. In contrast, along North American and European coastlines, introduced populations nearly always floated atop soft-sediment mudflats and were overwhelmingly dominated by diploid thalli without holdfasts. Introduced populations exhibited population genetic signals consistent with extensive vegetative fragmentation, while native populations did not. Thus, the ecological shift from attached to unattached thalli, ostensibly necessitated by the invasion of soft-sediment habitats, correlated with shifts from sexual to asexual reproduction and slight to strong diploid bias. We extend Baker's Law by predicting other colonizing haplo-diplontic species will show similar increases in asexuality that correlate with the dominance of one ploidy stage. Labile mating systems likely facilitate colonization success and subsequent range expansion, but for haplo-diplontic species, the long-term eco-evolutionary impacts will depend on which ploidy stage is lost and the degree to which asexual reproduction is canalized. SN - 1365-294X UR - https://www.unboundmedicine.com/medline/citation/27286564/Invasion_of_novel_habitats_uncouples_haplo_diplontic_life_cycles_ DB - PRIME DP - Unbound Medicine ER -