Density-Dependent Regulation of Ramet Populations Within the Bunchgrass Schizachyrium Scoparium: Interclonal Versus Intraclonal Interference

Briske, David D.; Butler, Jack L.

doi:10.2307/2260816

Cited by 72 publications

(62 citation statements)

References 34 publications

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“…Furthermore, k was higher in low-than in high-density populations, with the exception of R. discolor over the 1999-2000 transition. This pattern of population growth is similar to that of other clonal plant species (Barkham 1980;Cook 1985;Briske and Butler 1989) as well as that of the invasive, but non-clonal, Cytisus scoparius (Parker 2000), in response to increasing population density. The LTRE showed that for R. ursinus, the effect of density on k was due to a reduction in cane v survival with increasing population density, while in R. discolor, the difference was due to a reduction in cane v production.…”

Section: Population Growth and Invasivenesssupporting

confidence: 76%

“…The LTRE showed that for R. ursinus, the effect of density on k was due to a reduction in cane v survival with increasing population density, while in R. discolor, the difference was due to a reduction in cane v production. Reduced cane v production, rather than increased mortality, is a more commonly observed response to increased population density in other clonal plant species (Cook 1985;Briske and Butler 1989), perhaps because cane v mortality generates a resource cost for the entire clone. The mortality of cane v in R. ursinus was particularly pronounced over the 2000-2001 transition interval, along with mortality of other life-history stages, and may have arisen due to the colder than normal conditions during the winter and much drier than normal spring.…”

Section: Population Growth and Invasivenessmentioning

confidence: 99%

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Population demographics and trade-offs to reproduction of an invasive and noninvasive species of Rubus

Lambrecht-McDowell

Radosevich

2005

Biol Invasions

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Do trade-offs between growth and reproduction differ between an invasive and noninvasive plant species and how do such trade-offs relate to population demographics? To help address these questions, we compared demographics for an invasive plant species, Rubus discolor, with a noninvasive congener, R. ursinus, in several populations of varying density. Removal of floral buds from reproductive canes increased the size of juvenile canes that arose from clonal sprouting in R. ursinus, suggesting a trade-off between current reproduction and growth. Removal of floral buds had no effect on growth of R. discolor. R. ursinus displayed trade-offs between reproduction (sexual and vegetative) and future growth based on negative correlations between leaf area production and both clonal sprouting and seedling production during the previous year. R. discolor did not exhibit these trade-offs. Both species had high population growth rates in low-density populations, but exhibited little or no growth in high-density populations. A life table response experiment was used to determine the underlying cause for the effect of density on population growth. For R. ursinus, lack of population growth in high-density populations was due primarily to increased mortality of clonally sprouting canes, while for R. discolor, it was due to decreased clonal cane production. Elasticity analysis revealed that clonal growth was more important than sexual reproduction for population growth of both species. However, elasticity values for sexual reproduction in R. discolor were greater in high-than low-density populations. This suggests an increased reliance on sexual reproduction in populations that had reached stable sizes, which could increase the capacity of R. discolor to disperse to new sites. Elasticity analyses were also used to simulate the efficacy of various control strategies for R. discolor. Control of this species could be attained by reducing clonal production within existing populations while reducing seed production to limit establishment of new populations.

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Section: Population Growth and Invasivenesssupporting

confidence: 76%

Section: Population Growth and Invasivenessmentioning

confidence: 99%

Population demographics and trade-offs to reproduction of an invasive and noninvasive species of Rubus

Lambrecht-McDowell

Radosevich

2005

Biol Invasions

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“…Understanding tiller dynamics is critical in developing appropriate grazing strategies for rangelands (Cullan et al 1999). Most perennial grasses have bimodal recruitment patterns with flushes of new tillers emerging during the spring and fall (Langer 1956, Briske and Butler 1989, Briske and Richards 1995 ) , o n l y produced 1 annual cohort. These established patterns of tiller recruitment may be affected by defoliation which extends the recruitment period (Butler and Briske 1988), promotes additional tiller cohorts (Olson and Richards 1988a), and changes the timing of peak recruitment (Bullock et al 1994).…”

Section: Introductionmentioning

confidence: 99%

Tiller recruitment patterns and biennial tiller production in prairie sandreed

Hendrickson¹,

Moser²,

Reece³

2000

REM

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ResumenEl renuevo de las macollas (número de macollas que brotan durante todo el periodo de crecimiento) es un proceso esencial para asegurar la perennidad de los pastos. La regulación del tiempo, la cantidad de renovación de las macollas, y el papel de las macollas bienales deben ser documentados para las especies claves de las praderas. Prairie sandreed [Calamovilfa longifolia (Hook) Scribn.] es un pasto importante en las lomas arenosas (sandhills) al oeste de Nebraska, no solo por su contribución ecológica sino también como forraje. Los objetivos de este estudio han sido el de documentar el patrón de renuevo de las macollas, la ocurrencia y la contribución de las macollas durante el presente año y las macollas bienales del año anterior en la producción de la biomasa del pasto prairie sandreed en dos localidades de Nebraska. El renuevo de las macollas fué determinado cada dos semanas durante la época de crecimiento del pasto y por un período de dos años. A medida que las macollas iban brotando fueron clasificadas en intravaginadas (crecimiento desde adentro de la vaina de la hoja) y extravaginadas (penetración de la vaina de la hoja) o rizomas e identificadas con alambres de colores. El pasto prairie sandreed posee un patrón unimodal en su renovación de las macollas; durante el presente año mas del 50% de sus macollas, brotaron a mediados de Mayo y el 80% a mediados de Junio. La proporción de la brotación de las macollas y el número absoluto de las macollas que brotaron estuvo pobremente correlacionado (r < 0.3 P > 0.20) con la precipitación total a corto y a largo plazo. En el segundo año, las macollas bienales y las macollas que brotaron durante el presente año fueron contadas y cortadas para determinar la biomasa. Las macollas bienales representaron de un 6 al 20% del total de las macollas en las dos localidades , y fueron por lo general 30% tan grandes como las macollas nuevas. Las macollas extravaginadas formaron mas del 78% de la población de macollas bienales, debido a su caracter dominante para brotar y también a su alto porcentaje de sobrevivencia durante el invierno. Las macollas del presente año fueron las que mas contribuyeron a la producción del pasto forrajero sandreed, completando la mayor parte de su brotación a mediados de Junio. La carencia de relación entre el renuevo de las macollas y los patrones de la precipitación, combinado con resultados obtenidos en años anteriores, indican que el renuevo de las macollas está involucrado en un proceso el cual se inicia en el anterior período de crecimiento del pasto.

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“…2d). The ability of the grass life form at our site to exhibit a rapid, positive response to warmer conditions and to extend the season of growth is likely the result of (1) the existence of a large leaf area at the time of treatment application, (2) the inherent physiological capacity of grasses to alter patterns of resource allocation (Welker et al, 1985(Welker et al, , 1987Welker & Briske, 1992), (3) their morphological and demographic capacity to elongate fall tillers (Briske & Butler, 1989), and (4) the ability to grow when environmental constraints are temporally removed (Sala et al, 1992). Grasses at other tundra sites have also exhibited an ability to respond rapidly to simulated changes in climate as exemplified by Calamagrostis biomass increases in the sub-arctic at Abisko, Sweden under warmer conditions .…”

Section: Resultsmentioning

confidence: 99%

Simulating Alpine Tundra Vegetation Dynamics in Response to Global Warming in China

Zhang¹,

Song²,

Welker³

2010

Global Warming

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Density-Dependent Regulation of Ramet Populations Within the Bunchgrass Schizachyrium Scoparium: Interclonal Versus Intraclonal Interference

Cited by 72 publications

References 34 publications

Population demographics and trade-offs to reproduction of an invasive and noninvasive species of Rubus

Population demographics and trade-offs to reproduction of an invasive and noninvasive species of Rubus

Tiller recruitment patterns and biennial tiller production in prairie sandreed

Simulating Alpine Tundra Vegetation Dynamics in Response to Global Warming in China

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