Comparison of transient and asymptotic perturbation analyses of three epiphytic orchid species growing in coffee plantations in Mexico: effect on conservation decisions

Raventós, José; García-González, Alfredo; Riverón-Giró, Frander B.; Damon, Anne

doi:10.1080/17550874.2018.1444110

Cited by 5 publications

(3 citation statements)

References 31 publications

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“…One major cause is habitat degradation: populations of all six species in shade coffee plantations, a major land use in Southern Mexico, were declining due to tree pruning and felling. The three species growing on coffee host trees and expanding are at high risk from the common practice of epiphyte removal (Raventós, García‐González, Riverón‐Giró, & Damon, ). Although epiphytic orchids may function as metapopulations, with λ values higher when parameterized as such (Winkler, Hülber, & Hietz, ), elasticity analyses and simulations suggest that small levels of adult harvest can have large negative effects.…”

Section: Discussionmentioning

confidence: 99%

Synthesis of wild orchid trade and demography provides new insight on conservation strategies

Ticktin

Mondragón

López-Toledo

et al. 2020

CONSERVATION LETTERS

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Illegal wildlife trade represents a global conservation priority, but the booming illegal trade in wild plants remains understudied. We use the Mexican orchid trade to illustrate an interdisciplinary approach to provide novel insight on conservation strategies and policies. We synthesize studies of orchid markets, national orchid confiscation records, CITES registers, and global population dynamics studies to document trade patterns and potential ecological impacts. We found 333 wild-harvested orchid taxa illegally traded in domestic markets. Clear patterns emerged: 90% were epiphytic and <4% traded in high volumes, all of which had pseudobulbs and bloomed during cultural festivals. Most sales were pseudobulbs, not whole plants. Review of demographic studies indicates whole-plant harvest is unviable but simulations show potential for sustainable harvest of pseudobulbs. The combination of social and ecological findings suggests a novel multipronged approach to improve conservation, including selective monitoring, enforcement focused on whole-plant harvest, and communitybased wild harvest of pseudobulbs. K E Y W O R D Sconservation policy, illegal wildlife trade, matrix models, Mexico, orchids, social-ecological systems Conservation Letters. 2020;13:e12697.wileyonlinelibrary.com/journal/conl

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Section: Discussionmentioning

confidence: 99%

Synthesis of wild orchid trade and demography provides new insight on conservation strategies

Ticktin

Mondragón

López-Toledo

et al. 2020

CONSERVATION LETTERS

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“…While this assumption is likely not correct, it is considered as the best solution to the problem that the seeds can stay in dormancy for a variable number of years and the time of development to seedling is unknown (Shefferson, 2002;Gregg, 2011). This approach is used also in other studies on other species of orchids (Ackerman et al, 1996;García-González et al, 2017;Raventós et al, 2018).…”

Section: Seedling Recruitmentmentioning

confidence: 99%

Six-Year Demographic Study of the Terrestrial Orchid, Crepidium acuminatum: Implications for Conservation

et al. 2021

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Studies on population dynamics are helpful for understanding the factors determining population development and predicting the effects of disturbances, such as harvesting of plant species. In an investigation of the demography of a terrestrial medicinal orchid known as Crepidium acuminatum, the effects of harvesting on its population dynamics were recorded. Data on recruitment, growth and survival were collected in three populations of C. acuminatum over a 6-year period (2012–2017) in central Nepal. A matrix modeling method was used to determine the effect of different harvesting regimes on the population growth and survival of this species. Population growth rates (λ) of unharvested populations were relatively similar and stable in different years of the study. Harvesting significantly reduced λ. The results of this study indicate that the sustainable survival of a population that is subject to harvesting can only occur when it is either selective (only flowering individuals or only small amounts of vegetative individuals) or rotational (once every 3–5 or more years). This study demonstrates the necessity of using a sustainable method when harvesting natural populations. Our results are useful for developing efficient management strategies for this species. As each species has a different biology, similar studies are needed for other rare and/or economically important species in the Himalayan region and in other understudied parts of the world.

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“…Para la altura se establecieron tres categorías: individuos bajos (1 a 2.4 m), medianos (2.5 a 7 m) y altos (7.1 a 15 m); e igualmente para el DAP: individuos delgados (1 a 7.5 cm), medios (7.6 a 16.7 cm) y gruesos (16.8 a 62.4 cm). Para establecer estos intervalos, se ordenaron de menor a mayor los valores de altura y de DAP de todos los individuos encontrados en los ocho sitios muestreados, y se dividieron en tres grupos iguales, determinando los valores mínimos y máximos de cada intervalo (Raventós et al 2015, García-González et al 2017, Raventós et al 2018.…”

Section: Manejo De Datosunclassified

Distribución, densidad y estructura dasométrica de Haematoxylum campechianum y Haematoxylum calakmulense en Campeche, México

Vázquez

2019

Ecosist. Recur. Agropec.

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RESUMEN. En la Península de Yucatán se desarrollan dos especies del género Haematoxylum: Haematoxylum campechianum y H. calakmulense. El objetivo del presente trabajo fue evaluar el estado actual de las poblaciones de ambas especies en diferentes sitios en Campeche, México. Para conocer la distribución histórica y actual se utilizaron registros de herbarios publicados, información de proyectos y expediciones de campo. Para medir la densidad y la estructura dasométrica se seleccionaron ocho sitios con concentraciones de individuos de una u otra especie, y se establecieron 20 parcelas de 10 x 10 m en cada sitio. En las parcelas se contabilizaron y midieron los individuos de ambas especies con diámetro del tronco a la altura del pecho (DAP) mayor de 1 cm. Para cada individuo se tomó la altura, DAP y número de ramas. Se compararon las variables densidad, altura, DAP, número de ramas entre sitios y las frecuencias absolutas de los intervalos de tamaño y DAP dentro de cada sitio. Haematoxylum campechianum se encuentra ampliamente distribuido en el estado de Campeche y se localizó formando tintales y como árboles aislados. Mientras que H. calakmulense se encuentra en zonas interiores del estado con valores de densidad menores que H. campechianum, en ninguno de los sitios se encontró formando tintales. Para H. calakmulense los individuos más altos alcanzaron 12 m y para H. campechianum 15 m. Considerando el potencial económico, cada especie puede verse afectada por actividades antropogénicas que provoquen la disminución de sus poblaciones a mediano y largo plazo. Palabras clave: Especie comercial, especie con valor patrimonial, Península de Yucatán, selva baja inundable, tintal.

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Comparison of transient and asymptotic perturbation analyses of three epiphytic orchid species growing in coffee plantations in Mexico: effect on conservation decisions

Cited by 5 publications

References 31 publications

Synthesis of wild orchid trade and demography provides new insight on conservation strategies

Synthesis of wild orchid trade and demography provides new insight on conservation strategies

Six-Year Demographic Study of the Terrestrial Orchid, Crepidium acuminatum: Implications for Conservation

Distribución, densidad y estructura dasométrica de Haematoxylum campechianum y Haematoxylum calakmulense en Campeche, México

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