The viability of two populations of the terrestrial orchid Cyclopogon luteoalbus in a fragmented tropical mountain cloud forest: Dormancy delays extinction

Juárez, Lilian; Montaña, Carlos; Franco, Miguel

doi:10.1016/j.biocon.2013.12.021

Cited by 3 publications

(3 citation statements)

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“…The second interpretation should always be made with care in growing populations. It is more easily justified in the case of declining populations because in this case resources are generally not an issue (Morris & Doak 2002, Juárez et al 2014.…”

Section: O N L I N E F I R S Tmentioning

confidence: 99%

Conceptual and methodological issues in structured population models of plants

Martinez

Martorell²,

Franco

2022

Bot. Sci.

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Structured projection models (SPMs) are a powerful tool to investigate the dynamics of structured populations, which makes them ideal for the study of plant species spanning their range of life forms, sizes, longevity, and life cycle complexity. They are one of the most versatile tools in plant ecology, with hundreds of species studied so far and a wide variety of alternative formulations for different questions and purposes. We revise some of the most salient conceptual and methodological issues in the construction and use of SPMs including both discrete matrix projection models and continuous integral projection models. Consideration is given to the selection of the state variable and the estimation of parameters, especially those involving transitions difficult to observe in the field, such as the quantification of offspring production and the rarely observed mortality of individuals towards the end of the life cycle. Due to the growing importance of investigating population trends in a rapidly changing world, we highlight the use of SPMs for populations under a variety of environmental influences and/or away from their expected equilibrium. The presumed role of population density receives special attention because it often correlates with features of the environment, thus potentially confounding the two effects. Similarly, disentangling the various environmental effects poses challenges of its own, making it difficult to prove causality. The alternatives available are illustrated considering the selection of variables, samples, and model type suitable for specific purposes.

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Section: O N L I N E F I R S Tmentioning

confidence: 99%

Conceptual and methodological issues in structured population models of plants

Martinez

Martorell²,

Franco

2022

Bot. Sci.

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“…In some studies, the fates of dormant plants can be observed directly. For epiphytic orchid species, all life stages, including dormant plants, are possible to determine above‐ground (Juárez, Montaña & Franco ). In other studies, the fate of dormant plants has been evaluated through excavation and visual inspection of roots (Gremer, Sala & Crone ; Gremer & Sala ).…”

Section: Introductionmentioning

confidence: 99%

Instant death, slow death and the consequences of assumptions about prolonged dormancy for plant population dynamics

et al. 2016

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Summary Many perennial plants experience prolonged dormancy, meaning they do not grow above‐ground for one or several growing seasons. When plants disappear (fail to sprout) and have not been recorded to re‐emerge, they either have died or are alive and dormant. In demographic studies of such species, researchers have been forced to make assumptions about death versus dormancy. Little is known about the consequences of these assumptions for predictions from the population models used in the studies. Here, we define survival of dormancy‐prone plants in three distinct ways: Separate, Instant and Slow death. In the Separate death model, plants are assumed to die either in emergent or in dormant stages. Death can also be described as a process of disappearance followed by dying, either in the first year below‐ground (Instant death) or with constant mortality rate in any given dormant year (Slow death). Using simulated data with known parameter values, we test whether survival and re‐emergence rates are confounded in these life‐history models. Using a general model and models for two orchid species (Epipactis atrorubens and Isotria medeoloides), we test how different assumptions about dormancy (Instant and Slow death) affect predictions about population dynamics: population growth rate, generation time, relative reproductive values, life expectancies, and sensitivity and elasticity of population growth rate to stage transitions and vital rates. Our results confirm that survival and re‐emergence rates of dormancy‐prone plant species are difficult to estimate; parameters were separable only with the assumptions of Instant and Slow death. Both theoretical and empirical analyses show that the predictions of population growth rate and generation time do not depend on the assumptions made about the fate of the plants after their disappearance. Synthesis. Assumptions about dormancy affect some, but not all predictions, about plant population dynamics. In the studies of species with unobservable stages, assumptions about dormancy should be carefully defined and possible consequences of these assumptions for the predictions of the population model should be evaluated. Nonetheless, if we are only interested in overall population viability, ad hoc models of prolonged dormancy are sufficient as a first step.

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“…Las orquídeas presentan adaptaciones muy variadas para establecerse en su hábitat y reproducirse, por ello son un grupo candidato para analizar su diversidad y rasgos funcionales en conjunto (Dafni et al 1981, Swarts & Dixon 2009, Juárez et al 2014. Hasta el momento no se conoce cómo son las asociaciones espaciales entre rasgos funcionales y diversidad de orquídeas terrestres en diferentes tipos de vegetación, como en bosques templados del noreste de México donde este modo de crecimiento está mejor representado en la familia.…”

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Diversidad y rasgos funcionales de orquídeas terrestres en bosques de un área natural protegida del noreste de México

Baltazar

Solano

2020

Bot. Sci.

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Antecedentes:Los rasgos funcionales de las plantas se relacionan con sus estrategias adaptativas y son importantes en la diversidad de sus ecosistemas, pero han sido poco estudiados. Por sus adaptaciones en los ambientes estacionales, las orquídeas terrestres son un modelo para estudiar las relaciones entre diversidad taxonómica y funcional con el ambiente. Preguntas: ¿Cómo cambia la diversidad de orquídeas y sus rasgos funcionales entre tipos de vegetación? ¿Los rasgos funcionales permiten reconocer grupos de orquídeas? ¿La diversidad y rasgos funcionales de orquídeas se asocian con variables ambientales? Sitio y años de estudio: La Reserva de la Biosfera El Cielo, enero 2016 a enero 2017. Métodos: Se registró riqueza, abundancia y rasgos funcionales de orquídeas terrestres, así como variables ambientales en tres tipos de vegetación, estimando diversidad verdadera y funcional y recambio de especies. Se analizó la variación en rasgos funcionales para identificar grupos funcionales; se evaluaron las relaciones entre diversidad, rasgos funcionales y variables ambientales. Resultados: El bosque mesófilo de montaña y de pino-encino presentaron mayor diversidad verdadera, recambio de especies y diversidad funcional que el bosque tropical subcaducifolio. Se reconocieron tres grupos funcionales determinados por rasgos asociados a la acumulación y conservación de reservas. La diversidad taxonómica y funcional se relacionó con temperatura, humedad y densidad del dosel. No hubo relación entre riqueza y abundancia con diversidad funcional. Conclusiones: La diversidad taxonómica no determina la diversidad funcional; ambientes sometidos a mayor estrés ambiental presenta mayor diversidad funcional. La composición de grupos funcionales evidencia eventos de convergencia en rasgos funcionales.

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The viability of two populations of the terrestrial orchid Cyclopogon luteoalbus in a fragmented tropical mountain cloud forest: Dormancy delays extinction

Cited by 3 publications

References 38 publications

Conceptual and methodological issues in structured population models of plants

Conceptual and methodological issues in structured population models of plants

Instant death, slow death and the consequences of assumptions about prolonged dormancy for plant population dynamics

Diversidad y rasgos funcionales de orquídeas terrestres en bosques de un área natural protegida del noreste de México

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