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2 resultados encontrados para: AUTOR: Pulido Silva, María Teresa
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Resumen en: Inglés |
Resumen en inglés

Cycad Aulacaspis Scale (Hemiptera: Diaspididae: Aulacaspis yasumatsui Takagi, 1977), which is native to Southeast Asia, is a devastating pest of some species of cycads in areas where it is invasive. In September 2016, it was reported to be present in Chiapas in southern Mexico, a country with 60 native cycad species, most of which are endemic and endangered. Here we report the presence of the pest in 6 additional Mexican states and in Guatemala. Surveys of natural populations and quasinatural sustainable nurseries in 4 states, including Chiapas, find no evidence that the pest has yet spread to natural populations. At present, it appears to be confined to cultivated cycads, presenting a window of opportunity for effective control.

*En hemeroteca, SIBE-San Cristóbal
Variation in the population dynamics of the palm sabal yapa in a landscape a shaped by shifting cultivation in the Yucatan Peninsula, Mexico
Pulido Silva, María Teresa ; Valverde, Teresa (coaut.) ; Caballero, Javier (coaut.) ;
Contenido en: Journal of Tropical Ecology Vol. 23, parte 2 (March 2007), p. 139-149 ISSN: 0266-4674
Bibliotecas: San Cristóbal
SIBE San Cristóbal
B11215 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
Resumen en: Inglés |
Resumen en inglés

To understand the population dynamics of a species, it is necessary to document the way in which its demographic behaviour varies through space and time. Anthropogenic disturbance, such as shifting cultivation, is an important factor causing demographic variation in many tropical non-timber forest products. The leaves of the palm Sabal yapa are an important non-timber forest product used for thatching by Mayan peoples. The demography of Sabal yapa was studied in three habitats (mature forest, successional forest and crop fields), representing successional phases along the slash-and-burn agricultural cycle in the Yucatan Peninsula. Matrix population models, along with elasticity analyses and life-table-response experiments were employed. Population growth rate differed between patches (MF: ? = 1.043; SF: ? = 1.027; CF: ? = 0.959). Only the ? value of the mature forest was significantly higher than unity. Fecundity and seedling survival were lowest in the crop fields and highest in the mature forest. The elasticity analyses and life-table-response experiments showed that entries with a high positive contribution to ? also showed high elasticity values, while those with a negative contribution to ? showed low elasticity. Thus, both analyses are crucial to understand the demography of a species and to aid in conservation and management practices.