Floral sexual differentiation in Catasetum fimbriatum (Catasetinae, Orchidaceae) exposed to different light intensities

Pedroso-de-Moraes, Cristiano; Souza-Leal, Thiago de; Saoncella, Alinne Lozano; Almeida, Marcílio de

doi:10.15517/lank.v16i1.23746

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…Post‐fire changes on these abiotic resources can affect the sexual expression and reproduction of surviving plant species (Wolfe ; Pedroso‐De‐Morales et al . ; Abdusalam et al . ; Buide et al .…”

Section: Introductionmentioning

confidence: 99%

Frequent fires do not affect sexual expression and reproduction in Vachellia caven

et al. 2019

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In environments with high fire frequency the impoverishment of abiotic resources may favour male sexual expression in plants as it is less costly than female expression. Also, fire can modify pollinator communities and thus affect plant reproduction. Here we evaluate the effect of frequent fires on sexual expression, pollination and reproductive success of Vachellia caven (Leguminosae), an andromonoecious tree that is highly dependent on animal pollination and is abundant in burned sites. We expect that increased fire frequency will favour maleness but it will decrease reproductive success due to abiotic resource depletion in repeated burned sites. To test this, we selected focal plants in three unburned sites and three frequently burned sites and measured their sexual expression, basal diameter, pollination and fruit set. The proportion of male inflorescences per plant was not affected by fire and it was negatively related with the diameter of the plant. The proportion of pollinated flowers was not affected by fire, and fruit set increased with maleness only in frequently burned sites. These results indicate that V. caven is adapted to regimes of high fire frequency: not only was there similar fruit set in both burned and unburned sites, but more male plants had higher fruit set in burned sites. Despite the soil impoverishment triggered by repeated fires, V. caven is able to maintain its sexual and reproductive functions, allowing it to persist and maintain viable populations in fire-prone environments.Abstract in Spanish is available with online material.

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Section: Introductionmentioning

confidence: 99%

Frequent fires do not affect sexual expression and reproduction in Vachellia caven

et al. 2019

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Comparison of Catasetum bicolor and C. ochraceum (Catasetinae: Orchidaceae) habitat preferences: implications for their conservation

et al. 2021

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Family Orchidaceae is widely recognized for its mutualistic relationship with their pollinators, however, the knowledge about the most diverse monocotyledonous group on the planet it is still limited. Here, we recognized the ecological requirements and modeled the habitat preferences for Catasetum bicolor and C. ochraceum (Subfamily: Epidendroideae). We used climatic and bioclimatic data along with species’ occurrences records in a) Principal Components Analysis (PCA) to screen for the most influential variables; and, b) a maximum entropy algorithm (Maxent) for habitat suitability modeling. Also, preliminary conservation status and probable priority areas for monitoring and conservation were identified. Both species differed in their habitat preferences as shown by the altitudinal range. Factors screened by PCA were associated to temperature (average, minimum, seasonality), solar radiation, and precipitation of the driest and warmest months. The variables that influenced the most in the modeling process for C. bicolor were solar radiation, temperature seasonality, and its annual range; while for C. ochraceum were the precipitation of the driest month and solar radiation. Areas with habitat suitable conditions were identified in countries (Brazil, Colombia, Costa Rica, Ecuador, Nicaragua, Panama, and Venezuela) and biomes (humid and dry tropical, and subtropical forests) with highly dynamic land cover changes. The studied species were found to be in an endangered status based on their area of occupancy (< 76 km2). However, considering their extent of occurrence (> 20000 km2), they are in a status of less concern. These findings may be relevant for future monitoring plans and planning for ex-situ and in-situ conservation strategies.

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Floral sexual differentiation in Catasetum fimbriatum (Catasetinae, Orchidaceae) exposed to different light intensities

Cited by 2 publications

References 14 publications

Frequent fires do not affect sexual expression and reproduction in Vachellia caven

Frequent fires do not affect sexual expression and reproduction in Vachellia caven

Comparison of Catasetum bicolor and C. ochraceum (Catasetinae: Orchidaceae) habitat preferences: implications for their conservation

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