Biología Ambiental

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    Ecología espacial de los crocodylianos en el sector oriental del Parque Nacional Natural Tayrona, caribe colombiano durante el segundo semestre del 2021
    (Universidad de Ibagué, 2022) Bonilla Liberato, Edison Daniel; Balaguera Reina, Sergio; Farfán Ardila, Nidia
    Spatial ecology allows us to understand the life areas and dispersal patterns of organisms; however, it is a subject that is little evaluated at the international and national levels in crocodilians. This type of knowledge is essential for the generation of strategies for the conservation and protection of wildlife. The present study evaluated the home range and movement of crocodylians inhabiting the eastern sector of the Tayrona National Park between July 2021 and January 2022 using VHF radio telemetry. A total of 365 records were obtained with an error of 12.56 % from 6 individuals (five Caiman crocodilus and one Crocodylus acutus). Minimum convex polygon (MPC), local convex hull (LoCoH) and kernel density with isopleths at 50%, 95% and 100% were used to determine the home range per individual for C. crocodilus, and MPC for C. acutus due to the low number of points obtained in the surveys. The ArcMET tool was used to estimate mean (DMR) and maximum (DRM) distances travelled, together with the maximum speed of the species. It was observed that C. crocodilus females moved less than males. Significant differences were also found in the DMR of C. crocodilus at the intraspecific level, defining three groupings among individuals based on Dunn's test. On the other hand, a generalised linear model with negative binomial distribution was used to analyse the effect of environmental variables (precipitation, radiation, humidity, mean, minimum and maximum temperature), sex, individual and week on the movement of the species, finding that the only significant variable that influences the average weekly movements is individual (p-value of 0.0159; AIC 365.75). The present research is the first to investigate the spatial ecology of both species at a national level, and the results are fundamental for decision making in the conservation and protection of crocodylians in coexistence with human communities and related ecosystems within the Protected Area.