Rock Outcrop Plant Communities (Glades) in the Ozarks: A Synthesis

Ware, Stewart

doi:10.2307/3672662

Cited by 49 publications

(43 citation statements)

References 21 publications

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“…We sampled plants and pollinators in Ozark glades in Missouri, USA, which are insular rock outcrop patches of herbaceous vegetation within a forested matrix and contain many endemic plants and pollinators (Ware 2002). These communities historically stretched over large expanses of limestone bedrock in this region (Nelson and Ladd 1980), but have been considerably reduced in area due to fire suppression over the last century.…”

Section: Introductionmentioning

confidence: 99%

Shifts in pollinator composition and behavior cause slow interaction accumulation with area in plant–pollinator networks

Burkle

Knight

2012

Ecology

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Abstract. Although ecologists have a solid understanding of the positive species-area relationship, little is known about how and why variation in habitat area influences the richness, structure, and function of species interaction networks. To address this, we investigated plant-pollinator interaction networks of the herbaceous rocky outcrop communities in Ozark glades (Missouri, USA) of different areas. We quantified the degree to which the increase in the number of species interactions with area differed from a null model based on sampling, where numbers of individuals increase with area. Although plantpollinator interactions were expected to increase more steeply with area than species richness as a result of sampling, the observed rate of increase was considerably lower than expected. Two mechanisms could lead to this pattern: a higher proportion of specialist species in larger glades or generalist pollinators becoming more selective in their diets in larger glades. We found support for the former hypothesis, and those changes in species composition were strong enough to outweigh behavioral changes in the opposite direction; generalist pollinators were more selective in smaller glades. If these results are general, larger habitats may be needed to conserve interactions than would be thought based on species accumulation curves.

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Section: Introductionmentioning

confidence: 99%

Shifts in pollinator composition and behavior cause slow interaction accumulation with area in plant–pollinator networks

Burkle

Knight

2012

Ecology

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“…It is reasonable to expect that on sites where soils are shallow and underlain by bedrock or indurated limestone, that patterns of above-ground plant distribution and production could be strongly influenced by belowground patterns of fissures and crevices (Quarterman et al, 1993;Ware, 2002); and that some species may be better adapted than others at exploiting fissures providing access to deeper soil resources (Werner and Lu¨pnitz, 1999). We tested these expectations in microcosm experiments with two contrasting grass growth forms, but found few differences.…”

Section: Discussionmentioning

confidence: 98%

Response of two perennial grasses to root barriers and fissures

Jurena¹,

Archer²

2005

Journal of Arid Environments

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“…Interestingly, although L. uniflora and S. aurea are confined to sunlit, exposed, largely treeless barrens in the Ozark Mountains, the species do not occur in sympatry. Ware (2002), who studied the flora of Ozark barrens, reported that L. uniflora grows exclusively in calcareous glades (limestone or dolomite), while S. aurea grows in noncalcareous glades (sandstone or shale).…”

Section: Phylogenetic Relationships and Character Evolutionmentioning

confidence: 98%

Phylogeny of <I>Leavenworthia</I> and <I>Selenia</I> (Brassicaceae)

Urban¹,

Bailey²

2013

Systematic Botany

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The present study aimed to develop a robust, extensively sampled phylogenetic hypothesis across all species in Leavenworthia and Selenia using chloroplast (psbj-petA) and nuclear encoded (nrDNA ITS and LUMINIDEPENDENS) DNA sequence data. Parsimony and maximum likelihood methodologies were employed. Strong maximum likelihood bootstrap and parsimony jackknife support were recovered for the monophyly of the sister pair Leavenworthia plus Selenia and for the respective monophyly of each genus. Leavenworthia and Selenia are hypothesized to have diverged in the Ozark Mountains and results from an analysis of branch lengths leading to Leavemvorthia and Selenia clades are consistent with Leavenworthia having diversified more recently than Selenia. Polyploidy and extensive aneuploidy complicate the interpretation of chromosomal evolution within and between these genera. Comparative results from phylogenetic analyses indicate that L. aurea and L. texana are hybrids with a shared set of putative parents. Lastly, patterns of diversification within Leavenworthia appear to have included a minimum of three transformations from self-incompatible to self-compatible systems.

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Rock Outcrop Plant Communities (Glades) in the Ozarks: A Synthesis

Cited by 49 publications

References 21 publications

Shifts in pollinator composition and behavior cause slow interaction accumulation with area in plant–pollinator networks

Shifts in pollinator composition and behavior cause slow interaction accumulation with area in plant–pollinator networks

Response of two perennial grasses to root barriers and fissures

Phylogeny of <I>Leavenworthia</I> and <I>Selenia</I> (Brassicaceae)

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