
Claudia JollsEast Carolina University | ECU · Department of Biology
Claudia Jolls
B.S. in Botany, magna cum laude; Ph.D. in Biology
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29
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Introduction
Publications
Publications (29)
The role of individual plant species, including those that are rare or invasive, in the structure of plant-pollinator networks will depend on how connected the plants are to pollinator species and when they flower. Plant species visited by a high diversity of pollinators that visit few other species during a particular time period are thought to pr...
Network theory increasingly is used to quantify and evaluate mutualistic interactions, such as those among plants and their flower-visiting insects or pollinators. Some plant species have been shown to be important in community structure using network metrics; however, the roles of plant taxa, particularly rare species, are not well understood. Pit...
KAYRI HAVENS, CLAUDIA L. JOLLS, TIFFANY M. KNIGHT, AND PATI VITT The use of biocontrol agents has been promoted as a relatively safe, efficient, and environmentally friendly alternative to chemical or mechanical control of invasive plant species. However, these agents may not be effective or may have unacceptable nontarget effects on desirable plan...
Thalictrum cooleyi (Cooley's meadowrue, Ranunculaceae) is a federally endangered dioecious herb of wet pine savannas of the southeastern United States. We studied aspects of T. cooleyi biology crucial to conservation including its association with woody species, reproduction, and genetic structure in 11 populations in North Carolina and Georgia. Th...
Seed mass variation and heteromorphism may afford plant species differential germination behavior and ultimately seedling success, particularly in disturbed habitats. We asked whether such variation occurs in Packera tomentosa (Michx.) C. Jeffrey (Asteraceae), a clonal species of the southeastern USA. Seed mass was compared within and among genetic...
Larinus planus Frabicius (Curculionidae), is a seed-eating weevil that was inadvertently introduced into the US and was subsequently distributed in the US and Canada for the control of noxious thistle species of rangelands. It has been detected recently in the federally threatened Pitcher’s thistle (Cirsium pitcheri). We assayed weevil damage in a...
Pitcher's thistle (Cirsium pitcheri) is a federally listed monocarpic plant species endemic to the shoreline dunes of Lakes Huron, Michigan and Superior. Individual plants may require 4–8 y to mature, after which they flower and die. This life history and the lack of vegetative modes of reproduction make an understanding of seed and seedling ecolog...
Anthropogenic management of dynamic ecosystems has led to decline of species dependent on processes that maintain suitable habitat, particularly on barrier islands. By evaluating environmental variables over large geographic areas, remote-sensing data and geographic information systems (GIS) hold increasing promise for management of these unique ha...
Focusing on the oft-overlooked herbaceous layer of eastern forests, this volume combines perspectives from different levels of biological organization (ecophysiology to ecosystems) and forest types (from the eastern boreal forest to southeastern pine forests) into a synthesis of our knowledge of the ecology of this important forest layer. This is t...
This study is a comparison of certain facets of the alpine vegetation in Rocky Mountain National Park, U.S.A. with that of Mt. Kazbegi, central Caucasus, Republic of Georgia. There are many similarities in climate and geological history between the two sites. Also, their alpine floras contain 60 congeneric and 17 conspecific species, but great disp...
Significant differences in nectar content were observed between hermaphrodite and female plants of the gynomonoecious-gynodioecious taxon, Silene vulgaris, from populations in northern lower Michigan. These differences in nectar sugar content were observable with a carbohydrate digestion technique involving sulfuric acid, phenol, and measurement of...
Significant differences in nectar content were observed between hermaphrodite and female plants of the gynomonoecious-gynodioecious taxon, Silene vulgaris, from populations in northern lower Michigan. These differences in nectar sugar content were observable with a carbohydrate digestion technique involving sulfuric acid, phenol, and measurement of...
Documents the comparative success of seeds and seedlings of the perennial gynodioecious-gynomonoecious weed, Silene vulgaris. A higher proportion of seeds from outcrossed individuals germinated compared to that from self-fertilization. When data were analyzed to include and partition all sources of variation, differences among offspring appeared du...
This study documents the comparative success of seeds and seedlings of the perennial gynodioecious-gynomonoecious weed, Silene vulgaris, in the greenhouse. The importance of experimental design is stressed by comparing two different statistical analyses of the data. Seeds were obtained from artificial pollinations in the field: self-fertilization o...
Achenes of five goldenrod species (Solidago canadensis, S. graminifolia, S. juncea, S. nemoralis and S. speciosa) were collected from two old-field sites in southern Michigan to compare seed biomass and resource allocation within the fruit. The taxa differed from one another on the basis of total achene biomass as well as absolute biomass of embryo...
Early successional species (bigtooth aspen Populus grandidentata, trembling aspen P. tremuloides, paper birch Betula papyrifera) became established immediately after logging and fire approx 65yr ago because of rapid growth of root sprouts and stump sprouts, and are now in the canopy. Since 1974 these species have experienced mortality with no recru...
Biomass determinations and microbomb calorimetry were used to assess resource allocation in Sedum lanceolatum Torr. between 2,257 and 3,726 m above sea level in the Front Range of the Rocky Mountains, Colorado, USA. In general, energy values did not differ within a tissue among sites, but did differ among tissue types. Flowers and leaves had the gr...
Seedling densities, recruitment, and survival of Sedum lanceolatum during the growing season at seven populations between 2257 and 3726 m were studied to assess one aspect of successful sexual reproduction above and below timberline. Seedling densities declined drastically at timberline and above, even when corrections were made for differences in...
Significant differences in biomass allocation to asexual and sexual tissues were found among populations of Sedum lanceolatum Torr. at four elevational sites in the Rocky Mountains, Colorado. Plants harvested at similar stages in their phenological development from the lower (2,196 m) and upper (2,591 m) montane, subalpine (3,048 m) and alpine (3,7...