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Intergametophytic selfing and microgeographic genetic structure shape populations of the intertidal red seaweed Chondrus crispus.
Mol Ecol. 2013 Jun; 22(12):3242-60.ME

Abstract

Understanding how abiotic factors influence the spatial distribution of genetic variation provides insight into microevolutionary processes. The intertidal seascape is characterized by highly heterogeneous habitats which probably influence the partitioning of genetic variation at very small scales. The effects of tidal height on genetic variation in both the haploid (gametophytes) and diploid (tetrasporophytes) stages of the red alga Chondrus crispus were studied. Fronds were sampled every 25 cm within a 5 m × 5 m grid and along a 90-m transect at two shore heights (high and low) in one intertidal site in France. The multilocus genotype of 799 fronds was determined (Nhaploid = 586; Ndiploid = 213) using eight microsatellite loci to test the following hypotheses: (i) high and low shore fronds belong to genetically differentiated populations, (ii) gene flow is restricted within the high shore habitat due to tidal-influenced isolation and (iii) significant FIS values are driven by life history characteristics. Pairwise FST estimates between high and low shore levels supported the hypothesis that high and low shore fronds were genetically differentiated. The high shore was characterized by the occurrence of within-shore genetic differentiation, reduced genetic diversity and increased levels of intergametophytic selfing, suggesting it is a marginal environment. These results suggest at fine scales within the intertidal seascape the same mechanisms as those over the species' distributional range are at work with core and marginal population dynamics.

Authors+Show Affiliations

UPMC Univ Paris 06, UMR7144, Adaptation et Diversité en Milieu Marin, Station Biologique de Roscoff, Place Georges Teissier, 29682, Roscoff, France; CNRS, UMR7144, Adaptation et Diversité en Milieu Marin, Station Biologique de Roscoff, Place Georges Teissier, 29682, Roscoff, France; Departamento de Ecología, Facultad de Ciencias Biológicas, Center for Advanced Studies in Ecology and Biodiversity, Pontificia Universidad Católica de Chile, 6513677, Santiago, Chile.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

23294351

Citation

Krueger-Hadfield, S A., et al. "Intergametophytic Selfing and Microgeographic Genetic Structure Shape Populations of the Intertidal Red Seaweed Chondrus Crispus." Molecular Ecology, vol. 22, no. 12, 2013, pp. 3242-60.
Krueger-Hadfield SA, Roze D, Mauger S, et al. Intergametophytic selfing and microgeographic genetic structure shape populations of the intertidal red seaweed Chondrus crispus. Mol Ecol. 2013;22(12):3242-60.
Krueger-Hadfield, S. A., Roze, D., Mauger, S., & Valero, M. (2013). Intergametophytic selfing and microgeographic genetic structure shape populations of the intertidal red seaweed Chondrus crispus. Molecular Ecology, 22(12), 3242-60. https://doi.org/10.1111/mec.12191
Krueger-Hadfield SA, et al. Intergametophytic Selfing and Microgeographic Genetic Structure Shape Populations of the Intertidal Red Seaweed Chondrus Crispus. Mol Ecol. 2013;22(12):3242-60. PubMed PMID: 23294351.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Intergametophytic selfing and microgeographic genetic structure shape populations of the intertidal red seaweed Chondrus crispus. AU - Krueger-Hadfield,S A, AU - Roze,D, AU - Mauger,S, AU - Valero,M, Y1 - 2013/01/07/ PY - 2012/03/13/received PY - 2012/11/27/revised PY - 2012/11/29/accepted PY - 2013/1/9/entrez PY - 2013/1/9/pubmed PY - 2014/3/14/medline KW - algae KW - haploid-diploid life cycles KW - intergametophytic selfing KW - intertidal zone KW - mating system KW - population genetics KW - seascape influence SP - 3242 EP - 60 JF - Molecular ecology JO - Mol Ecol VL - 22 IS - 12 N2 - Understanding how abiotic factors influence the spatial distribution of genetic variation provides insight into microevolutionary processes. The intertidal seascape is characterized by highly heterogeneous habitats which probably influence the partitioning of genetic variation at very small scales. The effects of tidal height on genetic variation in both the haploid (gametophytes) and diploid (tetrasporophytes) stages of the red alga Chondrus crispus were studied. Fronds were sampled every 25 cm within a 5 m × 5 m grid and along a 90-m transect at two shore heights (high and low) in one intertidal site in France. The multilocus genotype of 799 fronds was determined (Nhaploid = 586; Ndiploid = 213) using eight microsatellite loci to test the following hypotheses: (i) high and low shore fronds belong to genetically differentiated populations, (ii) gene flow is restricted within the high shore habitat due to tidal-influenced isolation and (iii) significant FIS values are driven by life history characteristics. Pairwise FST estimates between high and low shore levels supported the hypothesis that high and low shore fronds were genetically differentiated. The high shore was characterized by the occurrence of within-shore genetic differentiation, reduced genetic diversity and increased levels of intergametophytic selfing, suggesting it is a marginal environment. These results suggest at fine scales within the intertidal seascape the same mechanisms as those over the species' distributional range are at work with core and marginal population dynamics. SN - 1365-294X UR - https://www.unboundmedicine.com/medline/citation/23294351/Intergametophytic_selfing_and_microgeographic_genetic_structure_shape_populations_of_the_intertidal_red_seaweed_Chondrus_crispus_ L2 - https://doi.org/10.1111/mec.12191 DB - PRIME DP - Unbound Medicine ER -