Examinando por Autor "García, Luis Fernando"
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- PublicaciónSólo datosNotes on the feeding habits of a wandering spider, Phoneutria boliviensis (Arachnida: Ctenidae)(Journal of Arachnology, 2020-06-17) Valenzuela-Rojas, Juan Carlos; González-Gómez, Julio César; Guevara, Giovany; Marcela Franco, Lida; Reinoso-Flórez, Gladys; García, Luis FernandoPhoneutria Perty, 1833 is considered one of the most toxic spider genera in the world; however, the natural history and biology of these spiders is still largely unexplored. The objective of this study was to determine the natural diet of the medically important species Phoneutria boliviensis (F.O.P.-Cambridge, 1897) based on prey records from Colombia, and supplemented by published records found in electronic databases as well as photographic records from the internet. We found that P. boliviensis is an euryphagous predator with a broad diet made up predominantly of arthropods (orders Araneae, Blattodea, Coleoptera, Hymenoptera, Lepidoptera, Mantodea, Orthoptera, and Phasmatodea) and to a lesser extent of small vertebrates (Gekkonidae, Hylidae, and Sphaerodactylidae). These results support previous evidence suggesting that P. boliviensis is a generalist predator that includes both invertebrates and small vertebrates in its diet.
- PublicaciónSólo datosSexual dimorphism in the biomechanical and toxicological performance in prey incapacitation of two morphologically distinct scorpion species (Chactas sp. and Centruroides sp.)(Biological Journal of the Linnean Society, 2020-01-01) González-Gómez, Julio César; Valenzuela-Rojas, Juan Carlos; García, Luis Fernando; Franco Pérez, Lida Marcela; Guevara, Giovany; Buitrago, Sandra; Cubillos, Alisson; Van Der Meijden, ArieMorphological differences between the sexes are a common feature in many groups of animals and can have important ecological implications for courtship, mating, access to prey and, in some cases, intersex niche partitioning. In this study, we evaluated the role of sexual dimorphism in the performance of the two structures that mediate the ability to access prey, the pinchers or chelae and the venomous stinger, in two species of scorpions with contrasting morphologies: Chactas sp., which has marked sexual dimorphism in the chelae, and Centruroides sp., which does not have such marked dimorphism in the chelae. We evaluated aspects such as chela pinch force, toxicity to prey (LD50) and the volume of venom in males and females of each species. We found significant differences between males and females of Chactas sp. in the chela pinch force, volume of venom and LD50. In contrast, for Centruroides sp., no differences between males and females were found in any of these traits. We discuss several potential selective regimes that could account for the pattern observed.