Conservation Biology of a Rare Plant Species, Eriocaulon kornickianum (Eriocaulaceae)

Watson, Linda E.; Uno, Gordon E.; McCarty, Newell A.; Kornkven, Amy B.

doi:10.2307/2445291

Cited by 13 publications

(8 citation statements)

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“…For fire‐tolerant species, fires may help to eliminate potential competitors (Hughes et al . 1991; Watson et al . 1994; Howe 1995) and may also favour population permanence and growth (Silva et al .…”

Section: Discussionmentioning

confidence: 99%

Population dynamics of Zea diploperennis, an endangered perennial herb: effect of slash and burn practice

et al. 2002

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Summary1 Zea diploperennis is a wild relative of maize that is endemic to the Sierra de Manantlán Biosphere Reserve in Mexico. Because this species is a priority for conservation in the reserve, the effects on its populations of the most common types of anthropogenic disturbance -slash-and-burn, and slash without subsequent burning -were investigated in three populations for 5 years. 2 The patterns of establishment and mortality were similar in all populations studied. Numbers of ears and fruits produced were significantly higher when disturbances were applied. 3 Because permanence is the most important stage in contributing to λ , the results suggest that the first genets to become established have an advantage over newly recruited plants. 4 When the two disturbance types were applied, λ was close to 1 or > 1. After the first disturbance, λ increased by almost 100%. In almost all situations, with or without disturbance, the persistence loops of Z. diploperennis are the most important life history pathways in the relative contribution to λ . In general, when λ increases, sexual growth loops also increase in importance, and persistence loops decrease. Changes in λ are not related to changes in vegetative growth loops. 5 If populations of Z. diploperennis are not disturbed at least once every 5 years, then species will go locally extinct in the wild.

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Section: Discussionmentioning

confidence: 99%

Population dynamics of Zea diploperennis, an endangered perennial herb: effect of slash and burn practice

et al. 2002

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“…Comparative investigation of populations under contrasting management conditions, such as disturbed and non-disturbed areas, can lead to a better understanding of demographic patterns than studies made on a single area (Watson et al 1994;Sánchez-Velásquez et al 2002;Souza and Martins 2006). Quantitative tools such as elasticity analysis can be used to evaluate the relative effects of vital rates (matrix elements) on population growth rate (k) (De Kroon et al 1986, 2000Caswell 2000).…”

Section: Introductionmentioning

confidence: 99%

Comparative demographic analysis in contrasting environments of Magnolia dealbata: an endangered species from Mexico

Sánchez-Velásquez

Pineda-López

2009

Population Ecology

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The study of population regulation and demography in natural habitats is critical for the conservation of rare and endangered species. We address the impact of cattle exclusion on the demographics of Magnolia dealbata (Magnoliaceae), an endangered species according to IUCN and Federal Mexican laws. Sixteen permanent plots were established, eight of which were enclosed to livestock, in the mountain cloud forest in Coyopolan, Mexico, which has the largest population of M. deadlbata. Censuses of the plots were undertaken annually during three annual cycles to record seed number, recruitment, mortality, and growth (defined as length and diameter at breast height). The effects of two treatments (with and without livestock exclusion) on the dynamics of M. dealbata were investigated using transition matrix models and life table response experiment (LTRE) analysis. Contrary to expectations, there was no significant effect of cattle exclusion on population growth rates (k). Furthermore, the k, estimated from the mean transition matrix for both treatments was greater than one. The transitions with the highest elasticity values were similar between the two treatments, while reproductive stage contributed more to differences in population growth rate and were less variable than the non-reproductive stage. LTRE analysis showed that treatment differences had little effect on k.Livestock exclusion appears to lead more to differences in the arrangement of the values of the transition matrix than to the rate of population growth for M. dealbata.

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“…Management for transplants has included mulching, shade cloth, grazing protection, insecticide, herbicide, and weeding and may be required for years (Guerrant 1996). Management has also involved manipulation of the transplanting site to mimic natural processes of disturbance, including burning and digging, to increase the probability of recruitment (Pullin & Woodell 1987; Watson et al 1994; Gordon 1996a; Pavlik 1996; Primack 1996). The manipulations (disturbance simulation) are designed to mimic beneficial natural disturbances, the absence of which potentially limits population growth.…”

Section: Discussionmentioning

confidence: 99%

Restoration ofHydrastis canadensisby Transplanting with Disturbance Simulation: Results of One Growing Season

Sinclair

Catling

2003

Restoration Ecology

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Having evolved in an environment with large, severe, and frequent disturbances, including massive floods, fires, and impacts of extinct and extirpated fauna, woodland herbs may be adapted to such disturbance processes. Present lack of such disturbances may contribute to present rarity. We test the hypothesis that transplanting with disturbance simulation can be used to restore the threatened woodland herb, Hydrastis canadensis (goldenseal). Three disturbance‐simulation treatments (soil turnover, fertilization, and both) and a control were randomly applied to 100 blocks in goldenseal habitat, and a single rhizome was transplanted into each treatment. Transplanting was effective with 85% of the transplants surviving, 41% flowering, and 34% fruiting; thus, transplanting may increase area of occupancy. Soil turnover alone and combined with fertilization caused a significant increase in plant size available to support production of fruit. Increased flower and significantly increased fruit production were also characteristic of soil‐turned plots. Results support the hypothesis that some woodland herbs are rare due to lack of certain disturbance, call for consideration of soil disturbance as a potentially important and beneficial influence on woodland herbs regardless of light effects, and suggest that transplanting into soil‐overturned plots may restore goldenseal. The assumption that undisturbed conditions are optimal may impede effective management of rare woodland flora, highlighting the need for a more flexible approach.

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Conservation Biology of a Rare Plant Species, Eriocaulon kornickianum (Eriocaulaceae)

Cited by 13 publications

References 0 publications

Population dynamics of Zea diploperennis, an endangered perennial herb: effect of slash and burn practice

Population dynamics of Zea diploperennis, an endangered perennial herb: effect of slash and burn practice

Comparative demographic analysis in contrasting environments of Magnolia dealbata: an endangered species from Mexico

Restoration ofHydrastis canadensisby Transplanting with Disturbance Simulation: Results of One Growing Season

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