Efecto de la iluminación artificial sobre la densidad poblacional y condición corporal del gecko exótico Hemidactylus frenatus y el gecko endémico Phyllodactylus lanei en la Estación de Biología Chamela, Jalisco, México
The exotic gecko Hemidactylus frenatus has caused the displacement and decrease of native gecko species that use anthropized environments, being a key success factor its ability to exploit food resources in sites with low or simple topography and with artificial lighting. In Mexico, this species was...
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| Format: | master thesis |
| Status: | Published version |
| Publication Date: | 2022 |
| Country: | México |
| Institution: | Universidad Autónoma Metropolitana |
| Repository: | Repositorio Institucional de la UAM Iztapalapa |
| Language: | Spanish |
| OAI Identifier: | oai:bindani.izt.uam.mx:qz20st00s |
| Online Access: | https://doi.org/10.24275/uami.qz20st00s |
| Access Level: | Open access |
| Keyword: | info:eu-repo/classification/LEM/Reptiles -- Jalisco (Mexico) info:eu-repo/classification/LEM/Reptiles -- Jalisco (México) info:eu-repo/classification/LEM/Geckos info:eu-repo/classification/cti/2 |
| Summary: | The exotic gecko Hemidactylus frenatus has caused the displacement and decrease of native gecko species that use anthropized environments, being a key success factor its ability to exploit food resources in sites with low or simple topography and with artificial lighting. In Mexico, this species was recorded for the first time in 1985; however, no study has been carried out to evaluate its impact on the country's native gecko species, even though some authors suggest that its presence is related to the decrease of other species. H. frenatus (exotic species) coexists with the endemic species Phyllodactylus lanei (native species) in the region of Chamela, Jalisco, and to date it is not known if there are negative effects of said exotic species on the native one, so this work research explores these effects. In the present study, two samplings were carried out in the dry season at the facilities of the Estación de Biología Chamela, Jalisco, with the intention of determining the population size, the population density in sites (constructions) with and without artificial light, the diet and the body condition of individuals in both species of geckos, as well as the availability of prey in the environment. Although the population size of the H. frenatus gecko was larger than that of P. lanei, the population density differed depending on light conditions. The population density of H. frenatus was higher in sites with artificial lighting, while that of P. lanei was higher in sites without artificial lighting. These results are related to the ability of H. frenatus to exploit food resources in anthropized environments. Regarding diet, it was similar in each light condition, however, with artificial light both species selected more Lepidoptera, but H. frenatus consumed larger prey. It should be noted that the body condition of P. lanei was not affected by the presence of H. frenatus. This is because P. lanei tends to take advantage of other types of prey present in places far from artificial light sources when prey availability is scarce, which allows these species to coexist. Therefore, the presence of H. frenatus in habitats occupied by P. lanei might not lead to the exclusion or local extinction of P. lanei in the Chamela region, Jalisco. |
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