Phenotypic differentiation in fitness related traits between populations of an extremely rare sunflower: Conservation management of isolated populations

Ellis, Jennifer R.; McCauley, David E.

doi:10.1016/j.biocon.2009.03.029

Cited by 12 publications

(17 citation statements)

References 56 publications

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“…Previous work indicated high levels of genetic diversity in all populations of this species Ellis 2008), yet a recent study of fitness related traits demonstrated that the Madison Co., Tennessee exhibited lower levels of fitness than the Alabama population and that this Tennessee population is perhaps mate limited (Ellis and McCauley 2009). The Georgia population also exhibited extremely poor fitness, with low germination rates and no individuals surviving to flowering.…”

Section: Conservation Implicationsmentioning

confidence: 90%

“…Despite this, one population exhibited significantly lower fitness values for achene viability and germination (Ellis and McCauley 2009;Ellis 2008). Here, I use EST-SSRs to investigate genetic population size and clonal diversity and structure in populations of H. verticillatus and ask (1) how many genetic individuals are in each population, (2) how are genetic individuals distributed within populations, (3) is this distribution similar in all populations, and (4) how does clonality relate to previous findings of high genetic diversity and fitness differentiation in this species?…”

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Clonal diversity, spatial dynamics, and small genetic population size in the rare sunflower, Helianthus verticillatus

Mandel

2010

Conserv Genet

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Knowledge of population size is an important step for identifying populations of immediate conservation concern. However, this task is difficult in plant species that exhibit clonal growth, since a simple ''head count'' may not be appropriate. Here, I determine the genetic population size and the extent of clonality in the four known populations of a rare sunflower, Helianthus verticillatus. Previous work in this species revealed high genetic diversity in all populations but significant fitness differences among them. In this study, populations exhibited high clonal diversity but consisted of far fewer genetic individuals than previously reported. Moreover, the clonal structure of populations was clumped, such that genotypes were highly clustered, which may promote selfing among genets. The results of this study are related to previously examined levels of genetic diversity and fitness, and findings are discussed in the context of the ecological and biological dynamics in clonal plant populations. Finally, the results of this study led to an upgrade in the priority status of this species for the Endangered Species List.

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Section: Conservation Implicationsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 97%

Clonal diversity, spatial dynamics, and small genetic population size in the rare sunflower, Helianthus verticillatus

Mandel

2010

Conserv Genet

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“…As documented in previous studies, uncontrolled crosses both within and among populations caused extinction of the original species and loss of genetic variation (Leary et al, 1995;Huxel, 1999;Ellis and McCauley 2009). The results obviously indicated that phenotypic variability and natural hybridization were determined in S. rizeensis, S. t. fario and S. coruhensis when spotting patterns were compared in fish.…”

Section: Discussionmentioning

confidence: 74%

Phenotypic differentiation analysis: A case study in hybridizing Çoruh trout (Salmo coruhensis), Rize trout (Salmo rizeensis) and brown trout (Salmo trutta fario)

2017

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The aim of this study was to determine and compare the phenotypic variation in Çoruh trout (Salmo coruhensis), Rize trout (Salmo rizeensis), brown trout (Salmo trutta fario) and their native hybrids (S. rizeensis × S. t. fario; S. t. fario × S. coruhensis; S. rizeensis × S. coruhensis). The numbers and diameters of red and black spots were determined on operculum, fins and above and below the lateral line. The results from this study indicate that there were differences in spotting pattern, colour pattern or fin pigmentation traits between S. rizeensis, S. t. fario, S. coruhensis and their hybrids. Consequently, native S. rizeensis, S. t. fario and S. coruhensis were affected by interaction and phenotypic plastic aspects of traits in S. rizeensis were dominant in their hybrids (S. rizeensis × S. t. fario; S. rizeensis × S. coruhensis).

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“…Moreover, there were far fewer distinct genetic individuals than previously thought (Ellis et al, 2006;Mandel, 2010). Additional studies on H. verticillatus have indicated very apparent differences in fitness among populations (Mandel, 2010;Ellis et al, 2006Ellis et al, , 2008Ellis and McCauley, 2009). These studies also posit that H. verticillatus may be more prone to self-pollination and may have experienced a major decline in distinct genetic individuals in recent history (Mandel, 2010).…”

Section: Introductionmentioning

confidence: 93%

“…Due to similar morphology and overlapping habitats among H. verticillatus and other Helianthus spp., Heiser et al (1969) speculated that H. verticillatus was a hybrid between H. angustifolius and H. grosseserratus. Both species belong in the Atrorubens section of the genus, have similar chromosome number (n = 17), overlapping habitats, and H. grosseserratus displayed verticillate leaf patterns in "exceptions" (Beatley, 1963;Heiser et al, 1969;Matthews et al, 2002;Seiler and Gulya, 2004;Ellis and McCauley, 2009).…”

Section: Introductionmentioning

confidence: 99%

Genetic Diversity and Conservation Status of Helianthus verticillatus, an Endangered Sunflower of the Southern United States

et al. 2020

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Evaluating species diversity and patterns of population genetic variation is an essential aspect of conservation biology to determine appropriate management strategies and preserve the biodiversity of native plants. Habitat fragmentation and potential habitat loss are often an outcome of a reduction in naturally occurring wildfires and controlled prescribed burning, as seen in Helianthus verticillatus (whorled sunflower). This endangered, wild relative of the common sunflower, Helianthus annuus, is endemic to four locations in Alabama, Georgia, and Tennessee, United States. Despite its endangered status, there is no recovery plan for H. verticillatus, and knowledge related to its basic plant biology and importance in ecosystem services is mostly unknown. In this study, we utilized 14 microsatellite loci to investigate fine-scale population structure and genetic diversity of H. verticillatus individuals found on two sampling sites within the Georgia population. Our results indicated moderate genetic diversity and the presence of two distinct genetic clusters. Analyses of molecular variance indicated that the majority of variance was individually based, thus confirming high genetic differentiation and limited gene flow between H. verticillatus collection sites. The evidence of a population bottleneck in these sites suggests a recent reduction in population size that could be explained by habitat loss and population fragmentation. Also, high levels of linkage disequilibrium were detected, putatively suggesting clonal reproduction among these individuals. Our study provides a better understanding of fine-scale genetic diversity and spatial distribution of H. verticillatus populations in Georgia. Our results can underpin an original recovery plan for H. verticillatus that could be utilized for the conservation of this endangered species and to promote its persistence in the wild.

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Phenotypic differentiation in fitness related traits between populations of an extremely rare sunflower: Conservation management of isolated populations

Cited by 12 publications

References 56 publications

Clonal diversity, spatial dynamics, and small genetic population size in the rare sunflower, Helianthus verticillatus

Clonal diversity, spatial dynamics, and small genetic population size in the rare sunflower, Helianthus verticillatus

Phenotypic differentiation analysis: A case study in hybridizing Çoruh trout (Salmo coruhensis), Rize trout (Salmo rizeensis) and brown trout (Salmo trutta fario)

Genetic Diversity and Conservation Status of Helianthus verticillatus, an Endangered Sunflower of the Southern United States

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