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- Rare plants (7)
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- Ludwigia leptocarpa (2)
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- Streptanthus morrisonii (2)
- Acer saccharinum (1)
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Articles 1 - 28 of 28
Full-Text Articles in Botany
Floristic Response To Urbanization: Filtering Of The Bioregional Flora In Indianapolis, Indiana, Usa, Rebecca W. Dolan, Myla F.J. Aronson, Andrew L. Hipp
Floristic Response To Urbanization: Filtering Of The Bioregional Flora In Indianapolis, Indiana, Usa, Rebecca W. Dolan, Myla F.J. Aronson, Andrew L. Hipp
Rebecca W. Dolan
PREMISE OF THE STUDY: Globally, urban plant populations are becoming increasingly important, as these plants play a vital role in ameliorating effects of ecosystem disturbance and climate change. Urban environments act as filters to bioregional flora, presenting survival challenges to spontaneous plants. Yet, because of the paucity of inventory data on plants in landscapes both before and after urbanization, few studies have directly investigated this effect of urbanization. METHODS: We used historical, contemporary, and regional plant species inventories for Indianapolis, Indiana USA to evaluate how urbanization filters the bioregional flora based on species diversity, functional traits, and phylogenetic community structure. …
Invasive Species In An Urban Flora: History And Current Status In Indianapolis, Indiana, Rebecca W. Dolan
Invasive Species In An Urban Flora: History And Current Status In Indianapolis, Indiana, Rebecca W. Dolan
Rebecca W. Dolan
Invasive plant species are widely appreciated to cause significant ecologic and economic damage in agricultural fields and in natural areas. The presence and impact of invasives in cities is less well documented. This paper characterizes invasive plants in Indianapolis, Indiana. Based on historical records and contemporary accounts, 69 of the 120 species on the official Indiana state list are reported for the city. Most of these plants are native to Asia or Eurasia, with escape from cultivation as the most common mode of introduction. Most have been in the flora of Indianapolis for some time. Eighty percent of Indianapolis’ invasive …
Bacon's Swamp- Ghost Of A Central Indiana Natural Area Past, Rebecca W. Dolan
Bacon's Swamp- Ghost Of A Central Indiana Natural Area Past, Rebecca W. Dolan
Rebecca W. Dolan
Bacon’s Swamp was identified in the 1920s as a ca. 12 ha glacial kettle lake bog system at the southernmost limits of these habitats in Indiana. Located just 9.6 km from the center of Indianapolis, the site was all but destroyed in the mid-20th century by urban expansion. Prior to habitat conversion at the site, Bacon’s Swamp was a frequent location for Butler University ecology class field trips and student research projects. Herbarium specimens and published inventory records allow for analysis of the historical vegetation of Bacon’s Swamp using modern techniques. Floristic Quality Assessment applied to these historical records reveals …
Changes In Plant Species Composition And Structure In Two Peri-Urban Nature Preserves Over 10 Years, Rebecca W. Dolan, Jessica D. Stepens, Marcia E. Moore
Changes In Plant Species Composition And Structure In Two Peri-Urban Nature Preserves Over 10 Years, Rebecca W. Dolan, Jessica D. Stepens, Marcia E. Moore
Rebecca W. Dolan
Peri-urban natural areas, at the boundaries of cities and adjacent agricultural/rural land, are subject to ecological threats endemic to both land use types. We used permanent plots to document changes in habitat quality by monitoring herbaceous-layer plant species presence and cover over a decade (1996/97 and 2007) in two peri-urban nature preserves in central Indiana, U.S.A. The preserves are comprised of different forest community types: wet-mesic depressional forest and mesic upland forest. Habitat characteristics, based on Floristic Quality Assessment parameters, showed only a single change for either preserve between survey years: wetness values were lower in the wet-mesic depressional site …
Two Hundred Years Of Forest Change: Effects Of Urbanization On Tree Species Composition And Structure, Rebecca W. Dolan
Two Hundred Years Of Forest Change: Effects Of Urbanization On Tree Species Composition And Structure, Rebecca W. Dolan
Rebecca W. Dolan
Despite their importance, the dynamics of urban floras are not well understood and quantitative historical data are rare. The current study used three data sets for trees in Indianapolis/Marion County, Indiana, U.S., to document change over 200 years to the original beech-maple forest and to examine future implications of contemporary tree planting efforts in light of these changes. Data on tree composition and size collected before significant settlement in the early 1800s are compared with recent surveys of trees in remnant natural areas and with trees found on city streets and rights-of-way. All the species recorded in historical surveys are …
Documenting Effects Of Urbanization On Flora Using Herbarium Records, Rebecca W. Dolan, Marcia E. Moore, Jessica Stephens
Documenting Effects Of Urbanization On Flora Using Herbarium Records, Rebecca W. Dolan, Marcia E. Moore, Jessica Stephens
Rebecca W. Dolan
As human populations increasingly live in cities, urban floras and the ecosystem services they provide are under increasing threat. Understanding the effects of urbanization on plants can help to predict future changes and identify ways to preserve biological diversity. Relatively few studies document changes through time in the flora of a focal region and those that do primarily address European floras. They often rely on contemporary spatial gradient studies as surrogates for changes with time. We compare historical species records (prior to 1940) with the current flora for Marion County, Indiana, USA, home to Indianapolis, the 13th largest city in …
Population Dynamics Of Ludwigia Leptocarpa (Onagraceae) And Some Factors Affecting Size Hierarchies In A Natural Population, Rebecca W. Dolan, Rebecca R. Sharitz
Population Dynamics Of Ludwigia Leptocarpa (Onagraceae) And Some Factors Affecting Size Hierarchies In A Natural Population, Rebecca W. Dolan, Rebecca R. Sharitz
Rebecca W. Dolan
Germination cohorts of Ludwigia leptocarpa, a semi-aquatic annual plant were marked in the field at time of establishment and followed through the 1981 and 1982 growing seasons at a site in southern South Carolina. Data from each cohort were pooled to determine demographic characteristics of the population as a whole, then analyzed separately to determine the effect of time on germination on survivorship, relative growth rate, and adult size. Changes in numbers of L. leptocarpa fit a Deevey Type II survivorship curve. This and other characteristics of the species classify it as ‘r-selected’. Aspects of the life history may reflect …
A Global Analysis Of The Impacts Of Urbanization On Bird And Plant Diversity Reveals Key Anthropogenic Drivers, Myla F.J. Aronson, Frank A. La Sorte, Charles H. Nilon, Madhusudan Katti, Mark A. Goddard, Christopher A. Lepczyk, Paige S. Warren, Nicholas S.G. Williams, Sarel Cilliers, Bruce Clarkson, Cynnamon Dobbs, Rebecca W. Dolan, Marcus Hedblom, Stefan Klotz, Jip Louwe Kooijmans, Ingolf Kühn, Ian Macgregor-Fors, Mark Mcdonnell, Ulla Mörtberg, Petr Pyšek, Stefan Siebert, Jessica Sushinsky, Peter Werner, Marten Winter
A Global Analysis Of The Impacts Of Urbanization On Bird And Plant Diversity Reveals Key Anthropogenic Drivers, Myla F.J. Aronson, Frank A. La Sorte, Charles H. Nilon, Madhusudan Katti, Mark A. Goddard, Christopher A. Lepczyk, Paige S. Warren, Nicholas S.G. Williams, Sarel Cilliers, Bruce Clarkson, Cynnamon Dobbs, Rebecca W. Dolan, Marcus Hedblom, Stefan Klotz, Jip Louwe Kooijmans, Ingolf Kühn, Ian Macgregor-Fors, Mark Mcdonnell, Ulla Mörtberg, Petr Pyšek, Stefan Siebert, Jessica Sushinsky, Peter Werner, Marten Winter
Rebecca W. Dolan
Urbanization contributes to the loss of the world's biodiversity and the homogenization of its biota. However, comparative studies of urban biodiversity leading to robust generalities of the status and drivers of biodiversity in cities at the global scale are lacking. Here, we compiled the largest global dataset to date of two diverse taxa in cities: birds (54 cities) and plants (110 cities). We found that the majority of urban bird and plant species are native in the world's cities. Few plants and birds are cosmopolitan, the most common beingColumba livia and Poa annua. The density of bird and plant species …
The Royal Catchfly (Silene Regia; Caryophyllaceae) In Indiana, Rebecca W. Dolan
The Royal Catchfly (Silene Regia; Caryophyllaceae) In Indiana, Rebecca W. Dolan
Rebecca W. Dolan
Botanist Thomas Nuttall called the royal catchfly, Silene regia, "one of the most splendid species in existence." This red-flowered, hummingbird-pollinated member of the Caryophyllaceae is a perennial herb of prairies and glades. Because of the conversion of much of its former habitat to agriculture, the royal catchfly is considered threatened in Indiana. The species' historical and present-day distribution in the State, documenting the current status of all known locations, including population sizes and co-occurring species, are reported in this paper. Only 8 of the documented 23 historical locations still support the plant. No populations occur in dedicated nature preserves or …
A Complete Index To The Butler University Botanical Studies, A Journal Of Original Research Published By Butler University 1929-1964, Rebecca W. Dolan
A Complete Index To The Butler University Botanical Studies, A Journal Of Original Research Published By Butler University 1929-1964, Rebecca W. Dolan
Rebecca W. Dolan
For 35 years, the Botany Department of Butler University published a journal of research conducted by Butler faculty, students. and other Indiana botanists. Many of the papers contain valuable historical studies. especially floristic surveys that document Indiana's vegetation in past decades. This article presents a complete index for the journal. arranged both chronologically and alphabetically. Reprints of articles are still available.
The Royal Catchfly (Silene Regia; Caryophyllaceae) In Indiana, Rebecca W. Dolan
The Royal Catchfly (Silene Regia; Caryophyllaceae) In Indiana, Rebecca W. Dolan
Rebecca W. Dolan
Botanist Thomas Nuttall called the royal catchfly, Silene regia, "one of the most splendid species in existence." This red-flowered, hummingbird-pollinated member of the Caryophyllaceae is a perennial herb of prairies and glades. Because of the conversion of much of its former habitat to agriculture, the royal catchfly is considered threatened in Indiana. The species' historical and present-day distribution in the State, documenting the current status of all known locations, including population sizes and co-occurring species, are reported in this paper. Only 8 of the documented 23 historical locations still support the plant. No populations occur in dedicated nature preserves or …
A Complete Index To The Butler University Botanical Studies, A Journal Of Original Research Published By Butler University 1929-1964, Rebecca W. Dolan
A Complete Index To The Butler University Botanical Studies, A Journal Of Original Research Published By Butler University 1929-1964, Rebecca W. Dolan
Rebecca W. Dolan
For 35 years, the Botany Department of Butler University published a journal of research conducted by Butler faculty, students. and other Indiana botanists. Many of the papers contain valuable historical studies. especially floristic surveys that document Indiana's vegetation in past decades. This article presents a complete index for the journal. arranged both chronologically and alphabetically. Reprints of articles are still available.
The Royal Catchfly (Silene Regia; Caryophyllaceae) In Indiana, Rebecca W. Dolan
The Royal Catchfly (Silene Regia; Caryophyllaceae) In Indiana, Rebecca W. Dolan
Rebecca W. Dolan
Botanist Thomas Nuttall called the royal catchfly, Silene regia, "one of the most splendid species in existence." This red-flowered, hummingbird-pollinated member of the Caryophyllaceae is a perennial herb of prairies and glades. Because of the conversion of much of its former habitat to agriculture, the royal catchfly is considered threatened in Indiana. The species' historical and present-day distribution in the State, documenting the current status of all known locations, including population sizes and co-occurring species, are reported in this paper. Only 8 of the documented 23 historical locations still support the plant. No populations occur in dedicated nature preserves or …
A Complete Index To The Butler University Botanical Studies, A Journal Of Original Research Published By Butler University 1929-1964, Rebecca W. Dolan
A Complete Index To The Butler University Botanical Studies, A Journal Of Original Research Published By Butler University 1929-1964, Rebecca W. Dolan
Rebecca W. Dolan
For 35 years, the Botany Department of Butler University published a journal of research conducted by Butler faculty, students. and other Indiana botanists. Many of the papers contain valuable historical studies. especially floristic surveys that document Indiana's vegetation in past decades. This article presents a complete index for the journal. arranged both chronologically and alphabetically. Reprints of articles are still available.
The Royal Catchfly (Silene Regia; Caryophyllaceae) In Indiana, Rebecca W. Dolan
The Royal Catchfly (Silene Regia; Caryophyllaceae) In Indiana, Rebecca W. Dolan
Rebecca W. Dolan
Botanist Thomas Nuttall called the royal catchfly, Silene regia, "one of the most splendid species in existence." This red-flowered, hummingbird-pollinated member of the Caryophyllaceae is a perennial herb of prairies and glades. Because of the conversion of much of its former habitat to agriculture, the royal catchfly is considered threatened in Indiana. The species' historical and present-day distribution in the State, documenting the current status of all known locations, including population sizes and co-occurring species, are reported in this paper. Only 8 of the documented 23 historical locations still support the plant. No populations occur in dedicated nature preserves or …
The Royal Catchfly (Silene Regia; Caryophyllaceae) In Indiana, Rebecca W. Dolan
The Royal Catchfly (Silene Regia; Caryophyllaceae) In Indiana, Rebecca W. Dolan
Rebecca W. Dolan
Botanist Thomas Nuttall called the royal catchfly, Silene regia, "one of the most splendid species in existence." This red-flowered, hummingbird-pollinated member of the Caryophyllaceae is a perennial herb of prairies and glades. Because of the conversion of much of its former habitat to agriculture, the royal catchfly is considered threatened in Indiana. The species' historical and present-day distribution in the State, documenting the current status of all known locations, including population sizes and co-occurring species, are reported in this paper. Only 8 of the documented 23 historical locations still support the plant. No populations occur in dedicated nature preserves or …
A Complete Index To The Butler University Botanical Studies, A Journal Of Original Research Published By Butler University 1929-1964, Rebecca W. Dolan
A Complete Index To The Butler University Botanical Studies, A Journal Of Original Research Published By Butler University 1929-1964, Rebecca W. Dolan
Rebecca W. Dolan
For 35 years, the Botany Department of Butler University published a journal of research conducted by Butler faculty, students. and other Indiana botanists. Many of the papers contain valuable historical studies. especially floristic surveys that document Indiana's vegetation in past decades. This article presents a complete index for the journal. arranged both chronologically and alphabetically. Reprints of articles are still available.
The Clute Holotypes And The Herbarium Of Willard Nelson Clute In The Friesner Herbarium Of Butler University, Rebecca W. Dolan
The Clute Holotypes And The Herbarium Of Willard Nelson Clute In The Friesner Herbarium Of Butler University, Rebecca W. Dolan
Rebecca W. Dolan
The herbarium of Willard Nelson Clute is housed in the Friesner Herbarium (BUT). Clute, co-founder of the American Fern Society, was a staff member at Butler University in the 1920's and 30's. His collection of ferns and fern allies from the tum of the century is significant for its selected regional coverage and for type specimens of taxa described by Clute and other fern specialists of the day.
The Rare, Serpentine Endemic Streptanthus Morrisonii (Brassicaceae) Species Complex, Revisited Using Isozyme Analysis, Rebecca W. Dolan
The Rare, Serpentine Endemic Streptanthus Morrisonii (Brassicaceae) Species Complex, Revisited Using Isozyme Analysis, Rebecca W. Dolan
Rebecca W. Dolan
The Streptanthus morrisonii (Brassicaceae) complex is a group of six narrowly-distributed obligate serpentine endemic taxa whose habitat is threatened by geothermal development. Isozyme analysis of this little-studied complex supports the delineation of two species, S. morrisonii and S. brachiatus, but is at odds with the treatment of two subspecies based on morphology. These results may be influenced by small sample sizes but genetic studies of other Streptanthus taxa have shown patterns of relatedness that often transgress subspecies boundaries based on morphology. The present study further shows that members of the S. morrisonii complex share high genetic identity values (mean = …
Population Genetic Structure In Nolina Brittoniana (Agavaceae), A Plant Endemic To The Central Ridges Of Florida, Rebecca W. Dolan, Rebecca Yahr, Eric S. Menges
Population Genetic Structure In Nolina Brittoniana (Agavaceae), A Plant Endemic To The Central Ridges Of Florida, Rebecca W. Dolan, Rebecca Yahr, Eric S. Menges
Rebecca W. Dolan
Nolina brittoniana is endemic to the central ridges of peninsular Florida. Its scrub and sandhill habitats have suffered extensive anthropogenic modification. Analysis of isozymes from populations throughout its range revealed less genetic variation than generally reported for endemic plants. Populations were well differentiated, with significant clines in allele frequency along the north-south axis of distribution. Pair-wise F-statistics calculated at four levels of population geographic substructure revealed that current and inferred historical habitat patches had similar genetic structure. We found no evidence of recent bottlenecks or changes in genetic structure due to habitat loss and fragmentation, consistent with populations having always …
Taxonomy Of Streptanthus Sect. Biennes, The Streptanthus Morrisonii Complex (Brassicaceae), Rebecca W. Dolan, Lawrence F. Lapre
Taxonomy Of Streptanthus Sect. Biennes, The Streptanthus Morrisonii Complex (Brassicaceae), Rebecca W. Dolan, Lawrence F. Lapre
Rebecca W. Dolan
The Streptanthus morrisonii complex is a six-taxon group of closely related serpentine rock outcrop endemics from Lake, Napa, and Sonoma counties of California, USA. Two new subspecies (S. morrisonii subsp. kruckebergii and S. brachiatus subsp. hoffmanii) from Lake County, California, are described. The relationship of these taxa to others in the section is reviewed and descriptions and a key are provided.
The Effects Of Seed Size And Maternal Origin On The Distribution Of Individual Plant Size In Ludwigia Leptocarpa (Onagraceae), Rebecca W. Dolan
The Effects Of Seed Size And Maternal Origin On The Distribution Of Individual Plant Size In Ludwigia Leptocarpa (Onagraceae), Rebecca W. Dolan
Rebecca W. Dolan
Seed size is normally distributed for many annual species, while mature plant size is frequently positively skewed. A study was conducted to determine the influence of seed size and the role of genetic differences in determining relative seedling size for Ludwigia leptocarpa. Seed size had a significant effect on percentage germination and time of seed germination but no effect on dry weight or leaf area of seedlings. Seed size and spacing had a significant effect on seedling dry weight for plants grown under competition, while relative day of emergence had no effect. Familial (genetic) differences were found in average seed …
Patterns Of Isozyme Variation In Relation To Population Size, Isolation, And Phytogeographic History In Royal Catchfly, Rebecca W. Dolan
Patterns Of Isozyme Variation In Relation To Population Size, Isolation, And Phytogeographic History In Royal Catchfly, Rebecca W. Dolan
Rebecca W. Dolan
The distribution of genetic variation within and among plant populations is influenced by both contemporary and historical factors. I used isozyme analysis of band phenotypes to examine genetic structure in the rare prairie forb Silene regia. Relationships between current-day population size, isolation, and phenotypic variation were assessed for 18 populations in two regions with differing postglacial history. Western populations from unglaciated southern Missouri and Arkansas were more genetically diverse based on the Shannon-Weaver index (H) and a polymorphic index than were more eastern populations. These differences may be due to loss of variation with repeated founding of new populations in …
Conservation Implications Of Genetic Variation In Three Rare Species Endemic To Florida Rosemary Scrub, Rebecca W. Dolan, Rebecca Yahr, Eric S. Menges, Matthew Halfhill
Conservation Implications Of Genetic Variation In Three Rare Species Endemic To Florida Rosemary Scrub, Rebecca W. Dolan, Rebecca Yahr, Eric S. Menges, Matthew Halfhill
Rebecca W. Dolan
Habitat conversion and fire suppression during the last 50 yr have greatly reduced and altered Florida scrub vegetation, resulting in threats to the persistence of its unique flora. As part of a larger conservation project, we investigated patterns of isozyme variation in three rare perennial scrub plants with overlapping ranges endemic to Florida rosemary scrub on the Lake Wales Ridge. All three species have low levels of genetic variation, comparable to or lower than those generally reported for rare plants with restricted geographic ranges. Liatris ohlingerae has more than twice the expected heterozygosity of the other two species, with little …
Conservation Implications Of Genetic Variation In Three Rare Species Endemic To Florida Rosemary Scrub, Rebecca W. Dolan, Rebecca Yahr, Eric S. Menges, Matthew Halfhill
Conservation Implications Of Genetic Variation In Three Rare Species Endemic To Florida Rosemary Scrub, Rebecca W. Dolan, Rebecca Yahr, Eric S. Menges, Matthew Halfhill
Rebecca W. Dolan
Habitat conversion and fire suppression during the last 50 yr have greatly reduced and altered Florida scrub vegetation, resulting in threats to the persistence of its unique flora. As part of a larger conservation project, we investigated patterns of isozyme variation in three rare perennial scrub plants with overlapping ranges endemic to Florida rosemary scrub on the Lake Wales Ridge. All three species have low levels of genetic variation, comparable to or lower than those generally reported for rare plants with restricted geographic ranges. Liatris ohlingerae has more than twice the expected heterozygosity of the other two species, with little …
Genetic Diversity And Reproductive Biology In Warea Carteri (Brassicaceae), A Narrowly Endemic Florida Scrub Annual, Margaret E.K. Evans, Rebecca W. Dolan, Eric S. Menges, Doria R. Gordon
Genetic Diversity And Reproductive Biology In Warea Carteri (Brassicaceae), A Narrowly Endemic Florida Scrub Annual, Margaret E.K. Evans, Rebecca W. Dolan, Eric S. Menges, Doria R. Gordon
Rebecca W. Dolan
Carter's mustard (Warea carteri) is an endangered, fire-stimulated annual endemic of the Lake Wales Ridge, Florida, USA. This species is characterized by seed banks and large fluctuations in plant numbers, with increases occurring in postdisturbance habitat. We investigated the mating system, patterns of isozyme variation, and effective population sizes of W. carteri to better understand its population biology and to comment on reserve designs and management proposals relevant to this species. Warea carteri is self-compatible and autogamous, and probably largely selfing. Measures of genetic variation in W. carteri were lower than values reported for species with similar ecological and life …
Genetic Change Following Fire In Populations Of A Seed-Banking Perennial Plant, Rebecca W. Dolan, Pedro F. Quintana-Ascencio, Eric S. Menges
Genetic Change Following Fire In Populations Of A Seed-Banking Perennial Plant, Rebecca W. Dolan, Pedro F. Quintana-Ascencio, Eric S. Menges
Rebecca W. Dolan
Disturbances such as fire have the potential to remove genetic variation, but seed banks may counter this loss by restoring alleles through a reservoir effect. We used allozyme analysis to characterize genetic change in two populations of the perennial Hypericum cumulicola, an endemic of the fire-prone Florida scrub. We assessed genetic variation before and 1, 2, and 3 years after fire that killed nearly all aboveground plants. Populations increased in size following fire, with most seedlings likely recruited from a persistent seed bank. Four of five loci were variable. Most alleles were present in low frequencies, but our large sample …
A New Species Of Streptanthus (Brassicaceae) From Three Peaks In Lake County, California, Rebecca W. Dolan, Richard O'Donnell
A New Species Of Streptanthus (Brassicaceae) From Three Peaks In Lake County, California, Rebecca W. Dolan, Richard O'Donnell
Rebecca W. Dolan
Streptanlhus vernalis is a newly described species inhabiting serpentine rock outcrops in the Three Peaks area in Lake County, California. Morphological and allozyme data indicate that this taxon is related to the S. morrisonii complex.