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Moderate anthropogenic disturbance does not affect the demography of Magnolia schiedeana, an endangered species from Mexico

Por: Sánchez Velásquez, Lázaro Rafael [autor/a].
Vásquez Morales, Suria Gisela | Pineda López, María del Rosario [autor/a] | Díaz Fleischer, Francisco [autor/a] | Flores Estévez, Norma [autor/a] | Viveros Viveros, Héctor [autor/a].
Tipo de material: Artículo en línea Artículo en línea Tema(s): Magnolia schiedeana | Plantas | Población vegetal | Actividades antropogénicas | Bosque de nieblaTema(s) en inglés: Magnolia schiedeana | Plants | Plant populations | Anthropogenic activities | Cloud forestsDescriptor(es) geográficos: Veracruz de Ignacio de la Llave (México) Nota de acceso: Disponible para usuarios de ECOSUR con su clave de acceso En: Flora. volumen 234, número 3 (September 2017), páginas 77-83. --ISSN: 0367-2530Número de sistema: 58768Resumen:
Inglés

Among the many Magnolia species that are endangered by anthropogenic disturbance, some are knownto have the capacity to produce new shoots. Demographic studies are an important tool to evaluate the impact of disturbances as well as the resilience and resistance of endangered species. Our study lookedat the demographic dynamics of two Magnolia schiedeana populations, with an aim to determine therole played by disturbances. The questions were: 1) what demographic trends characterize this species? 2) What differences are there between disturbed and undisturbed populations? 3) Is M. schiedeana adisturbance-resilient species in general? 4) How important is the contribution of the resprouting trait to λ in a population under anthropogenic disturbance? The demographic attributes evaluated were: elasticity, population growth rate (λ), and sensitivity to concrete disturbances (LTRE, Life Table Response Experiment). The results indicated that the λ of the two populations did not differ significantly. The transitions that contributed the most to λ and presented the largest variation were similar in both population sunder study. More than 90% of the contribution came from those individuals measuring ≤ 5 cm in diameter. Surprisingly, M. schiedeana is not sensitive to moderate anthropogenic disturbance. Resprouting contributed to with less than 0.2%.

Recurso en línea: https://www.sciencedirect.com/science/article/pii/S0367253017332656
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Among the many Magnolia species that are endangered by anthropogenic disturbance, some are knownto have the capacity to produce new shoots. Demographic studies are an important tool to evaluate the impact of disturbances as well as the resilience and resistance of endangered species. Our study lookedat the demographic dynamics of two Magnolia schiedeana populations, with an aim to determine therole played by disturbances. The questions were: 1) what demographic trends characterize this species? 2) What differences are there between disturbed and undisturbed populations? 3) Is M. schiedeana adisturbance-resilient species in general? 4) How important is the contribution of the resprouting trait to λ in a population under anthropogenic disturbance? The demographic attributes evaluated were: elasticity, population growth rate (λ), and sensitivity to concrete disturbances (LTRE, Life Table Response Experiment). The results indicated that the λ of the two populations did not differ significantly. The transitions that contributed the most to λ and presented the largest variation were similar in both population sunder study. More than 90% of the contribution came from those individuals measuring ≤ 5 cm in diameter. Surprisingly, M. schiedeana is not sensitive to moderate anthropogenic disturbance. Resprouting contributed to with less than 0.2%. eng

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