Genetic Population Structure and Mating System in Chondrus Crispus (Rhodophyta)1

Krueger‐Hadfield, Stacy A.; Collén, Jonas; Daguin‐Thiébaut, Claire; Valéro, Myriam

doi:10.1111/j.1529-8817.2011.00995.x

Cited by 56 publications

(50 citation statements)

References 61 publications

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“…Oliveira, 1986 (Guillemin et al 2008). In other species, the occurrence of sex, even occasionally, explained the lack of significant differences between haploid and diploid subpopulations: Gelidium canariensis (Grunow) Seoane Camba (Sosa & Garcia-Reina 1993); Gracilaria gracilis (Stackhouse) M. Steentoft, L. M. Irvine and W. F. Farnham 1995 (Engel et al 2004); Cladophoropsis membranacea (Hofman Bang ex C.Agardh) Børgesen, 1905(van der Strate et al 2002, and Chondrus crispus Stackhouse, 1797 (Krueger-Hadfield et al 2011). Genotyping both haploid and diploid individuals in these species is necessary to detect clonality and its effect on population structure.…”

Section: Taxonomic Knowledgementioning

confidence: 99%

Species are hypotheses: avoid connectivity assessments based on pillars of sand

et al. 2015

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Connectivity among populations determines the dynamics and evolution of populations, and its assessment is essential in ecology in general and in conservation biology in particular. The robust basis of any ecological study is the accurate delimitation of evolutionary units, such as populations, metapopulations and species. Yet a disconnect still persists between the work of taxonomists describing species as working hypotheses and the use of species delimitation by molecular ecologists interested in describing patterns of gene flow. This problem is particularly acute in the marine environment where the inventory of biodiversity is relatively delayed, while for the past two decades, molecular studies have shown a high prevalence of cryptic species. In this study, we illustrate, based on marine case studies, how the failure to recognize boundaries of evolutionary-relevant unit leads to heavily biased estimates of connectivity. We review the conceptual framework within which species delimitation can be formalized as falsifiable hypotheses and show how connectivity studies can feed integrative taxonomic work and vice versa. Finally, we suggest strategies for spatial, temporal and phylogenetic sampling to reduce the probability of inadequately delimiting evolutionary units when engaging in connectivity studies.

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Section: Taxonomic Knowledgementioning

confidence: 99%

Species are hypotheses: avoid connectivity assessments based on pillars of sand

et al. 2015

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“… Using the resorcinol test, Krueger‐Hadfield et al. () was able to assign ploidy to more individuals than were genotyped with the microsatellite loci. The sample size genotyped is provided in parantheses. …”

Section: Macroalgal Studies In Which Microsatellites Have Been Used Tmentioning

confidence: 99%

The importance of effective sampling for exploring the population dynamics of haploid–diploid seaweeds

Krueger‐Hadfield

Hoban

2016

Journal of Phycology

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The mating system partitions genetic diversity within and among populations and the links between life history traits and mating systems have been extensively studied in diploid organisms. As such most evolutionary theory is focused on species for which sexual reproduction occurs between diploid male and diploid female individuals. However, there are many multicellular organisms with biphasic life cycles in which the haploid stage is prolonged and undergoes substantial somatic development. In particular, biphasic life cycles are found across green, brown and red macroalgae. Yet, few studies have addressed the population structure and genetic diversity in both the haploid and diploid stages in these life cycles. We have developed some broad guidelines with which to develop population genetic studies of haploid-diploid macroalgae and to quantify the relationship between power and sampling strategy. We address three common goals for studying macroalgal population dynamics, including haploid-diploid ratios, genetic structure and paternity analyses.

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“…From a biological perspective, macroalgae have often been viewed as poor-dispersing species owing to short-lived spores and gametes [1], complex coastal topography [2], habitat discontinuities [3] and reproductive strategies and intrinsic life-history characteristics [4,5]. Studies investigating genetic structuring of macroalgae have generally demonstrated that gene flow is very limited [3,[5][6][7] and is heavily influenced by their complex life histories [4,5,7]. Gene flow in macroalgae is further influenced by landscape quality between populations in addition to geographical distance and dispersal capabilities [3].…”

Section: Introductionmentioning

confidence: 99%

Understanding macroalgal dispersal in a complex hydrodynamic environment: a combined population genetic and physical modelling approach

Brennan

Kregting

Beatty

et al. 2014

J. R. Soc. Interface.

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Gene flow in macroalgal populations can be strongly influenced by spore or gamete dispersal. This, in turn, is influenced by a convolution of the effects of current flow and specific plant reproductive strategies. Although several studies have demonstrated genetic variability in macroalgal populations over a wide range of spatial scales, the associated current data have generally been poorly resolved spatially and temporally. In this study, we used a combination of population genetic analyses and high-resolution hydrodynamic modelling to investigate potential connectivity between populations of the kelp Laminaria digitata in the Strangford Narrows, a narrow channel characterized by strong currents linking the large semi-enclosed sea lough, Strangford Lough, to the Irish Sea. Levels of genetic structuring based on six microsatellite markers were very low, indicating high levels of gene flow and a pattern of isolation-by-distance, where populations are more likely to exchange migrants with geographically proximal populations, but with occasional long-distance dispersal. This was confirmed by the particle tracking model, which showed that, while the majority of spores settle near the release site, there is potential for dispersal over several kilometres. This combined population genetic and modelling approach suggests that the complex hydrodynamic environment at the entrance to Strangford Lough can facilitate dispersal on a scale exceeding that proposed for L. digitata in particular, and the majority of macroalgae in general. The study demonstrates the potential of integrated physicalbiological approaches for the prediction of ecological changes resulting from factors such as anthropogenically induced coastal zone changes.

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Genetic Population Structure and Mating System in Chondrus Crispus (Rhodophyta)1

Cited by 56 publications

References 61 publications

Species are hypotheses: avoid connectivity assessments based on pillars of sand

Species are hypotheses: avoid connectivity assessments based on pillars of sand

The importance of effective sampling for exploring the population dynamics of haploid–diploid seaweeds

Understanding macroalgal dispersal in a complex hydrodynamic environment: a combined population genetic and physical modelling approach

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