Population Dynamics of the Wild Daffodil (Narcissus Pseudonarcissus): I. Clonal Growth, Seed Reproduction, Mortality and the Effects of Density

Barkham, J. P.

doi:10.2307/2259425

Cited by 81 publications

(51 citation statements)

References 30 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: 75%

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: 75%

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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“…These figures represent means of at least 3 years of data (Barkham, 1980a). Plants characterized by Barkham as 'subadult' had lower mortality rates, 7-9% (shade) to 9-6% (sun) per year.…”

Section: Patterns Of Mortalitymentioning

confidence: 99%

“…Tamm (1948) measured yearly risk of death for Anemone hepatica (0-6%), Fragaria vesca (6-3%), and Sanicula europaea (0-4%); he did not distinguish between plants of different sizes once adulthood had been reached. Barkham (1980a) reports mortality rates for adult Narcissus pseudonarcissus growing in the shade and in the open of 5-6 and 3 8% per year respectively. The annual mortality rates of male and female Chamaelirium luteum are 1-3 to 3-0% and 2-6 to 5-1 % respectively (Meagher and Antonovics, in press).…”

Section: Patterns Of Mortalitymentioning

confidence: 99%

“…These changes can be attributed, at least in part, to changing levels of canopy cover. Barkham (1980a) describes signiflcant year-to-year differences for Narcissus pseudonarcissus in the mean number of capsules containing seeds. Over the course of a 10-year study, he examined whether year-to-year changes in numbers of shoots and flowers might be correlated with variations in weather and canopy conditions.…”

Section: Population Structure and Stabilitymentioning

confidence: 99%

“…j\farcissuspseudonarcissus (Barkham, 1980a) and perhaps Arum maculatum (Sowter,J949). Ants disperse the seeds of Hexastylis arifolia (Gonzalez, 1972), and Handel (1 976) provides a long list of other forest herbs, including Carex pedunculata, that are thought to be ant-dispersed.…”

mentioning

confidence: 99%

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Life Histories and Demography of Shade‐tolerant Temperate Forest Herbs: A Review

1982

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SUMMARYInformation is reviewed on the life histories and demographic patterns of shade-tolerant herbs of temperate deciduous forest. Most of the species that have been studied are deciduous perennials. These species generally have a juvenile (non-flowering) period of several years followed by an extended period of flower and seed production. About half the species reviewed are self-incompatible, the others are at least partially self-compatible. Although vegetative reproduction is common, replacement does not always occur by vegetative spread; many species appear to be able to replace themselves by seed. Sexual reproductive effort ratiges from 15 to 50 % among the species reviewed; seed weight averages 2-6 mg. Short dormancy periods (one season) are most common, with germination rates getierally below 50%.Mortality rates of small plants are high, but decline as plant size increases. 'Ageing' does not appear to occur. No information exists on population growth rates of temperate deciduous forest herbs, or on the temporal stability of their population sizes or structures. The transition matrix model is suggested as a promising approach to future studies in plant demography.

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Climate change, land cover change, and overharvesting threaten a widely used medicinal plant in South Africa

Groner

Nicholas

Mabhaudhi

et al. 2022

Ecological Applications

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Medicinal plants contribute substantially to the well‐being of people in large parts of the world, providing traditional medicine and supporting livelihoods from trading plant parts, which is especially significant for women in low‐income communities. However, the availability of wild medicinal plants is increasingly threatened; for example, the Natal Lily (Clivia miniata), which is one of the most widely traded plants in informal medicine markets in South Africa, lost over 40% of individuals over the last 90 years. Understanding the species’ response to individual and multiple pressures is essential for prioritizing and planning conservation actions. To gain this understanding, we simulated the future range and abundance of C. miniata by coupling Species Distribution Models with a metapopulation model (RAMAS‐GIS). We contrasted scenarios of climate change (RCP2.6 vs. RCP8.5), land cover change (intensification vs. expansion), and harvesting (only juveniles vs. all life‐stages). All our scenarios pointed to continuing declines in suitable habitat and abundance by the 2050s. When acting independently, climate change, land cover change, and harvesting each reduced the projected abundance substantially, with land cover change causing the most pronounced declines. Harvesting individuals from all life stages affected the projected metapopulation size more negatively than extracting only juveniles. When the three pressures acted together, declines of suitable habitat and abundance accelerated but uncertainties were too large to identify whether pressures acted synergistically, additively, or antagonistically. Our results suggest that conservation should prioritize the protection of suitable habitat and ensure sustainable harvesting to support a viable metapopulation under realistic levels of climate change. Inadequate management of C. miniata populations in the wild will likely have negative consequences for the well‐being of people relying on this ecosystem service, and we expect there may be comparable consequences relating to other medicinal plants in different parts of the world.

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Population Dynamics of the Wild Daffodil (Narcissus Pseudonarcissus): I. Clonal Growth, Seed Reproduction, Mortality and the Effects of Density

Cited by 81 publications

References 30 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

Life Histories and Demography of Shade‐tolerant Temperate Forest Herbs: A Review

Climate change, land cover change, and overharvesting threaten a widely used medicinal plant in South Africa

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