¿Hay asincronía demográfica entre poblaciones locales de Tillandsia recurvata ? evidencias de su funcionamiento metapoblacional

Valverde, Teresa; Bernal, Y Rocío

doi:10.17129/botsci.2318

Cited by 11 publications

(13 citation statements)

References 36 publications

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“…A survey by Mondragón et al (2015) revealed that nearly two-thirds of epiphytic orchid populations had l values !1.0. Furthermore, they found, as we did, that populations tend to function independently and asynchronously, a phenomenon that characterizes metapopulation dynamics (Tremblay et al 2006;Laube and Zotz 2007;Valverde and Bernal 2010). Thus, finding populations with negative growth rates may be normal and not necessarily cause for alarm.…”

supporting

confidence: 73%

Small Populations on Small Islands: What Chance Does an Orchid Have?

Ackerman

Tremblay

Pérez³

et al. 2020

International Journal of Plant Sciences

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Premise of research. Small populations on small islands are intrinsically more vulnerable to population decline and extinction. Nevertheless, small native populations that occur on multiple islands may have life-history characteristics that buffer impacts from novel disturbance regimes, and, rather than contracting, populations may be expanding. We monitored three populations of the orchid Brassavola cucullata from two Caribbean islands and asked what the likelihood of population persistence is.Methodology. Over 3-4 yr, we recorded growth, fruit production, herbivory, recruitment, and mortality for all plants in each of our populations. We assessed persistence and predicted possible population changes using both population projection models (PPMs) and integral projection models (IPMs). Our results include a mixture of traditional indexes (l and elasticities) and more recent indexes (transient dynamics and nonlinear sensitivities).Pivotal results. Growth, reproduction, and predicted population persistence varied among years and islands. IPMs and PPMs gave similar results. The overall trend is toward a reduction in population growth rates, although population reactivity may buffer this pattern in the short term (l > 1). Populations would be extremely vulnerable to reduction if small plants dominated, yet even with an abundance of large plants, substantial reductions in population density are possible. Medium and larger plants contribute more to the persistence of the population, yet the survival and growth of small individuals might have greater effects on l if retrogression is observed. To attain population stability, effective recruitment rates must increase dramatically.Conclusions. Populations of perennial plants on small islands can fluctuate substantially, suggesting a degree of vulnerability. While B. cucullata shows a general trajectory of decline, there are some signs of stability despite deforestation and herbivore activity. The outlook is precarious for the Saba population given the predominance of younger plants, and all three populations could decline if spasmodic recruitment fails to occur, which may happen if disturbance regimes change and the ongoing warming and drying trends persist.

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supporting

confidence: 73%

Small Populations on Small Islands: What Chance Does an Orchid Have?

Ackerman

Tremblay

Pérez³

et al. 2020

International Journal of Plant Sciences

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“…While none of the articles explicitly discusses the factors that might influence these phenophases, it is known that anemochorous plants in seasonal tropical forests tend to disperse their seeds during the dry season (de Lampe et al, 1992;Morellato and Leitão-Filho, 1996;Cortés-Flores et al, 2019) since this dispersal syndrome is closely linked to wind speed and the surrounding vegetation (Augspurger, 1986). Dispersal during the dry season results more effective given the lack of foliage, facilitating the flow of wind currents and allowing the seeds to be carried over longer distances (García-Franco and Rico-Gray, 1991;Mondragón and Calvo-Irabien, 2006;Valverde and Bernal, 2010;Escobedo-Sarti and Mondragón, 2016). As occurs with flowering, fructification, and seed dispersal are influenced by other phenological phases (Primack, 1987) because, for instance, successful regeneration of a species does not only depend on seed dispersal, but also on seeds being dispersed over favorable areas during periods that allow them to germinate and establish as seedlings (Clark et al, 1999).…”

Section: Factors That Determine Fruiting and Seed Dispersal Phenology In Vascular Epiphytesmentioning

confidence: 99%

Vascular Epiphytes: The Ugly Duckling of Phenological Studies

Martínez¹,

Mondragón²,

García³

2021

Acta biol. Colomb.

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The phenology of vascular epiphytes, which represent account for about 10 % of the world’s flowering plants and perform important ecological functions, has been just partially explored. Since phenology is a key tool for the management and conservation of species, the objective of this review was to synthesize the information published so far about the phenology of vascular epiphytes, detect gaps of knowledge, and suggest future lines of investigation to understand the underlying mechanisms. We conducted an online search for articles in Google Scholar and in the ISI Web of Science database from 1800 to 2020, with different combinations of keywords. 107 studies addressing the phenology of different holo-epiphyte species were found; 88 % of the studies were performed in the Neotropic, especially in tropical and subtropical wet forests. The phenology of only ca.2% (418 spp.) of all reported epiphyte species has been explored. There is a bias toward the study of the flowering and fruiting phenology in members of the Orchidaceae (192 spp.) and Bromeliaceae (124 spp.) families. In general, the vegetative and reproductive phenology of epiphytes tends to be seasonal; however, there is a huge gap in our understanding of the proximate and ultimate factors involved. Future research should explicitly focus on studying those factors.

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“…Las poblaciones del género Tillandsia poseen un patrón de crecimiento en forma de bandas o agrupado, patrón que depende de la cercanía de la población a la costa, de la pendiente, de la cantidad de neblina a la que están expuestas, de la topografía del lugar (ya sea en zonas arenosas o rocosas, presente en colinas o a faldas de cerros) y del transporte aéreo de los sedimentos (Hesse, 2012). El crecimiento del género Tillandsia no se da de manera uniforme en toda el área, algunas zonas tienen mayor crecimiento y distribución que otras, tal como en el caso de T. recurvata, que posee variaciones en el crecimiento debido a la variabilidad de las CARBONO Y AGUA EN Tillandsia latifolia Enero -Julio 2020 ______________________________________________________________________________________ diferentes condiciones abióticas en las que se encuentra el área del tillandsial (por ejemplo, las diferencias en pendiente, sustrato, altura o intensidad y dirección de viento (Valverde & Bernal, 2010). Otro caso es el de Tillandsia latifolia Meyen, cuya densidad y distribución espacial tiene relación con la topografía y el sustrato en el que se encuentran, siendo la densidad de estas plantas mayor cuando se encuentran con exposición de neblina (Aponte & Flores, 2013).…”

Section: Introductionunclassified

ALMACENAMIENTO DE CARBONO Y AGUA EN Tillandsia latifolia Meyen EN UN SECTOR DEL TILLANDSIAL DE PIEDRA CAMPANA (LIMA / PERÚ)

Arévalo

Aponte

2020

Ecol. apl.

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Resumen Los tillandsiales son ecosistemas desérticos que se caracterizan por que sus comunidades están conformadas, principalmente, por plantas del género Tillandsia. A la fecha, se desconoce el rol que tienen estas comunidades en la captación de carbono y el potencial rol que tienen al almacenar agua en la biomasa vegetal del desierto. El presente estudio buscó cuantificar la cantidad de carbono y agua que almacena Tillandsia latifolia Meyen en un tillandsial de la costa de Lima (Piedra Campana, Cañete-Lima). Para ello, se evaluaron todas las laderas y quebradas de un sector del tillandsial, se pesó la biomasa aérea y se recolectaron muestras de suelo (primeros 10 cm); se midió el porcentaje de agua y carbono almacenado en la biomasa, y el carbono en las muestras de suelo. Todos los datos obtenidos fueron procesados utilizando la técnica de interpolación kriging. El carbono total ascendió a 94.1 toneladas (t) (3.63 t/ha), hallándose más carbono almacenado en la parte del suelo (76.50 t) que en la parte aérea (17.60 t). La cantidad de carbono que almacena este tillandsial está por debajo del de varios ecosistemas que se utilizan para la compensación de emisiones de CO2, como humedales o formaciones vegetales amazónicas. Por otro lado, la cantidad de agua almacenada ascendió a más de 164 mil litros, valor que resulta importante como reserva de agua en esta región desértica. Se discuten las implicancias de los resultados obtenidos para la valoración y gestión de este ecosistema desértico. Palabras clave: desierto costero, Tillandsia latifolia, tillandsial, servicio ecosistémico.

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¿Hay asincronía demográfica entre poblaciones locales de Tillandsia recurvata ? evidencias de su funcionamiento metapoblacional

Cited by 11 publications

References 36 publications

Small Populations on Small Islands: What Chance Does an Orchid Have?

Small Populations on Small Islands: What Chance Does an Orchid Have?

Vascular Epiphytes: The Ugly Duckling of Phenological Studies

ALMACENAMIENTO DE CARBONO Y AGUA EN Tillandsia latifolia Meyen EN UN SECTOR DEL TILLANDSIAL DE PIEDRA CAMPANA (LIMA / PERÚ)

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