Infrequent Establishment of Seedlings of Agave deserti (Agavaceae) in the Northwestern Sonoran Desert

Jordan, P.; Nobel, Park S.

doi:10.2307/2442574

Cited by 79 publications

(89 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…die after fruiting) and deplete their sugar reserves to produce a huge quantity of seeds (Nobel, 1988). Although produced seeds have high germination capacity, most seedlings die 8 -9 days after germination ( Jordan & Nobel, 1979;Arizaga & Ezcurra, 2002). Agaves also have clonal mechanisms of reproduction.…”

Section: Introductionmentioning

confidence: 99%

Invasion ofAgavespecies (Agavaceae) in south‐east Spain: invader demographic parameters and impacts on native species

Badano

Pugnaire

2004

Diversity and Distributions

View full text Add to dashboard Cite

Several mechanisms have been proposed to explain the success of invasive species in new environments. A species may become invasive when a new site provides the potential for positive rates of population growth. This may be the case of several Agave species introduced to Spain in the 1940s. In this paper we document factors that promote large increases of populations of these species, and their effects on native plant communities in two sites of SE Spain. Results showed higher rhizome and bulbil production, and higher establishment rates by agaves in sandy soils than in clay soils. In their native habitats, agaves have low establishment rates and sandy soils are rare. This suggests that sandy soils are an opportunity which releases the clonal reproduction of Agave. The effects of agaves on the physiological performance and reproduction of native species were negative, positive or neutral, depending on the size and rooting depth of neighbours. Assemblages of native species growing within Agave stands had lower diversity than non‐invaded sites. Our data show that Agave stands have positive growth rates in SE Spain, and suggest that sandy soils are a niche dimension enhancing the invasion in these new habitats.

show abstract

Section: Introductionmentioning

confidence: 99%

Invasion ofAgavespecies (Agavaceae) in south‐east Spain: invader demographic parameters and impacts on native species

Badano

Pugnaire

2004

Diversity and Distributions

View full text Add to dashboard Cite

show abstract

“…No obstante, la extracción y destrucción de individuos adultos podría revertir este efecto, ya que en el género Agave L. el reclutamiento de nuevos adultos a partir de semillas es poco frecuente (Jordan y Nobel, 1979;Nobel, 1988).…”

Section: Discussionunclassified

“…Asimismo, aunque la reproducción por semillas podría generar un patrón menos agregado, la germinación y sobrevivencia para magueyes silvestres en ambientes naturales es un evento muy poco frecuente (menor a 1%) (Jordan y Nobel, 1979;Ramírez-Tobías et al, 2014), como se pudo notar en la menor frecuencia relativa de individuos de clase de tamaño I. Es probable que la reproducción sexual sea importante en el mantenimiento de la diversidad y en la generación de nuevas combinaciones genéticas; sin embargo, se ha reportado que su contribución demográfica es prácticamente nula y el mantenimiento y crecimiento de las poblaciones ocurre principalmente por reproducción asexual (Arizaga y Ezcurra, 2002).…”

Section: Discussionunclassified

“…Aunque la sombra parcial reduce la tasa fotosintética de agaves adultos y juveniles, en otras especies del género, las plántulas originadas a partir de semillas requieren de sombra parcial para poder sobrevivir y crecer en ambientes cálidos y secos (Jordan y Nobel, 1979;Franco y Nobel, 1988). En el caso de Agave angustifolia, para individuos más pequeños, las tasas de fotosíntesis y crecimiento son mayores en individuos que reciben 50% de la luz ambiental total que las iluminadas con mayor o menor intensidad (Cervera, datos sin publicar).…”

Section: Discussionunclassified

See 1 more Smart Citation

Factores ambientales relacionados con la cobertura de Agave angustifolia (Asparagaceae) en el matorral costero de Yucatán, México

2018

View full text Add to dashboard Cite

Resumen:Antecedentes y Objetivos: Agave angustifolia, o chelem, es el único maguey silvestre de la Península de Yucatán y es el ancestro de especies domesticadas de gran valor económico y cultural. Presta importantes servicios ambientales como recurso alimenticio para la fauna, fijación de suelos arenosos y captura de carbono en ambientes áridos con suelos pobres. Es un cultivo potencial de cara al aumento de las sequías predichas para la región y del empobrecimiento genético del henequén. El objetivo de este trabajo es recabar datos sobre la densidad de sus poblaciones, su patrón espacial, estructura poblacional y la relación entre su abundancia y los factores ambientales en el matorral costero de Yucatán, con el fin de evaluar su uso en la restauración ecológica. Métodos: Se muestrearon tres localidades costeras: Chuburná (Ch), San Benito (SB) y Río Lagartos (RL). En SB y RL se trazaron 36 cuadrantes de 4 m 2 ; dentro de cada uno se estimó el porcentaje de cobertura de Agave angustifolia, el de los arbustos de más de 1 m de alto y la cobertura de mantillo. Se tomaron muestras de suelo a las que se analizó pH, conductividad eléctrica, nitrógeno total, materia orgánica y escala de gris. Se describieron la densidad poblacional, distribución espacial y estructura por tamaños de A. angustifolia en SB y Ch.Resultados clave: La cobertura de Agave angustifolia se correlaciona negativamente con la cobertura de arbustos y mantillo, y cantidad de materia orgánica. Las densidades de su población fueron inferiores a 0.1 individuos/m 2 , hubo una mayor proporción de plántulas y su distribución espacial es agregada. Conclusiones: Al soportar suelos pobres, altas temperaturas y radiación solar, la especie puede servir para restaurar algunas funciones ecológicas en las zonas más áridas de la costa donde la vegetación ha sido severamente dañada. Palabras clave: Arenosol, distribución espacial, estructura poblacional, suculenta, taxon emparentado con cultivos, zonas semiáridas. AbstRAct:Background and Aims: Agave angustifolia, or chelem, is the only wild species of the Yucatán Peninsula and is the ancestor of cultivated species with great economic and cultural values. It provides important environmental services such as food source for fauna, it fixes sandy soils and sequesters carbon in arid habitats with poor soils. It is a potential crop that may face the dryness exacerbation expected for the region and the genetic erosion of henequen. The aim of this work is to gather data about its population density, spatial pattern, size structure, and the relationship between its abundance and environmental factors of the Yucatán coastal scrublands, in order to assess the use of the species for ecological restauration purposes. Methods: Field work was carried out in three coastal sites: Chuburná (Ch), San Benito, (SB) and Río Lagartos (RL). Thirty six 4 m 2 plots were placed in SB and RL; we estimated the relative cover of Agave angustifolia, shrubs higher than 1 m and litter in each plot. Potential of Hidrogen (pH), electric conductivit...

show abstract

“…The most important factors that induce germination are humidity and light (Rojas-Ar echiga et al 2001), and these factors are also important during seedling establishment. Several ecological studies documented that recruitment occurs during periods with favorable conditions of rainfall (Jordan and Nobel 1979;Pierson and Turner 1998;God ınez-Alvarez et al 2005), or in "safe sites" (sensu Harper et al 1961), such as cavities in rocks (Peters et al 2008), and also under the canopy of perennial shrubs that serve as "nurse plants" (Turner et al 1966;Steenbergh and Lowe 1969). Nurse plants provide microsites that facilitate growth and increase seedling survival by providing protection against direct solar radiation, extreme temperatures, and soil moisture evaporation (Flores and Jurado 2003;Brooker et al 2008;Mart ınez-Berdeja and Valverde 2008).…”

Section: Discussionmentioning

confidence: 99%

Effects of natural and artificial selection on survival of columnar cacti seedlings: the role of adaptation to xeric and mesic environments

Guillén

Terrazas

Casas

2015

Ecology and Evolution

View full text Add to dashboard Cite

Escontria chiotilla, Polaskia chichipe, and Stenocereus pruinosus are species of Mexican columnar cacti that are economically important because of their edible fruits. These species are managed by gathering fruits from the wild, silvicultural management in agroforestry systems, and cultivation in home gardens. Previous studies reported that artificial selection favored individuals that produced larger fruits, which indirectly led to the production of larger seeds and seedlings, with possible effects on survival. We hypothesized that seedlings from managed populations would be larger but more susceptible to xeric conditions than those from wild populations. We evaluated the effects of artificial and natural selection on seedling survival of the three species in wild and managed populations, which were managed with low and high intensity, respectively. We tested seedling performance in gradients of shade (0, 40, and 80%) and humidity (low and high). A GLM of seedling survival showed significant differences among species, shade, and humidity treatments, with each species having environmental requirements associated with their particular adaptations. High humidity decreased seedling survival of all species, and high solar radiation decreased survival of S. pruinosus and P. chichipe. The effect of management type was significant only in S. pruinosus. Significant differences in the initial growth of seedlings among species were detected with ANOVA. In optimal conditions, the hypocotyl and the cotyledons decreased in size and the epicotyl grew, whereas under stress, these structures remained unchanged. The optimum conditions of shade and humidity varied among species and management types. The seedlings of S. pruinosus were the largest and the most susceptible, but in all species, seedlings from managed populations were more susceptible to environmental conditions. Thus, artificial selection influenced the susceptibility of these cacti to xeric environments.

show abstract

Infrequent Establishment of Seedlings of Agave deserti (Agavaceae) in the Northwestern Sonoran Desert

Cited by 79 publications

References 0 publications

Invasion ofAgavespecies (Agavaceae) in south‐east Spain: invader demographic parameters and impacts on native species

Invasion ofAgavespecies (Agavaceae) in south‐east Spain: invader demographic parameters and impacts on native species

Factores ambientales relacionados con la cobertura de Agave angustifolia (Asparagaceae) en el matorral costero de Yucatán, México

Effects of natural and artificial selection on survival of columnar cacti seedlings: the role of adaptation to xeric and mesic environments

Contact Info

Product

Resources

About