Population Structure and Catasetum Ochraceum Pollinating Agents in the Western Mountain Range Cliffs (La Vorágine, Colombia)
Abstract
Catasetum ochraceum is a terrestrial orchid with discontinuous distribution in Colombia and Venezuela. A population was monitored for four years in La Vorágine, Valle del Cauca, Colombia. Pollination observations were made, as well as a census of individuals in the population was carried out. Catasetum spp is known to be pollinated by male euglossine bees, so to identify local pollinators, traps were located with attractants 1-8 cineol and methyl salicylate to collect bees with Catasetum polynaries. A total of 50 individuals were recorded, measured and mapped for follow-up from 2016 to 2020. During the observation period, no marked plants produced fruit and 22 plants survived until the end of the sampling. As for the collection of bees, 18 specimens of eight different species were recorded: Eulema nigrita, Exaerete smaragdina, Euglossa despecta, Eg. ignita, Eg. modestior, Eg. tridentata, Eg. deceptrix and Eg. liopoda. From these, Eg. deceptrix and Eg. liopoda carried polynaries of C. ochraceum. Therefore it is concluded that this population of orchids could be threatened, but the reasons for the population decline are unknown. In addition, two potential pollinator species are identified in the study area.
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References
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