Moderate anthropogenic disturbance does not affect the demography of Magnolia schiedeana, an endangered species from Mexico
Periodo de realización: 1900/01/01 al 2017/06/01
Tipo: Artículo científico
Lugar(es) de estudio: San Cristóbal de las Casas, Chis., México, Xalapa Enríquez, Ver., México
Resumen: "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 theimpact 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 lamda in a population under anthropogenic disturbance? The demographic attributes evaluated were: elas-ticity, population growth rate (lamda), and sensitivity to concrete disturbances (LTRE, Life Table ResponseExperiment). The results indicated that the lamda of the two populations did not differ significantly. The tran-sitions that contributed the most to lamda and presented the largest variation were similar in both populationsunder study. More than 90% of the contribution came from those individuals measuring = 5 cm in diam-eter. Surprisingly, M. schiedeana is not sensitive to moderate anthropogenic disturbance. Resproutingcontributed to lamda with less than 0.2%."