Efecto de los gases lacrimógenos en la abundacia de aves en la ciudad de Caracas, Venezuela

Cristina Sainz-Borgo

doi:10.53157/ecotropicos.30e0001

Authors

Cristina Sainz-Borgo Simón Bolívar University Author https://orcid.org/0000-0001-9252-2524

DOI:

https://doi.org/10.53157/ecotropicos.30e0001

Keywords:

perturbación antropog´énica, gases tóxicos, aves urbanas

Abstract

In order to determine whether bird abundance changed because of the use of tear gas in the proximities of the recreational park ”Generalísimo Francisco de Miranda” at Caracas city, Venezuela, I conducted individual surveys of species observed during two sampling periods on 2017: (1) January-February (without the use of gases) and (2) June-July (use of gases at least three times a week). The counts were conducted, between 5:30 and 7:30 h, using the direct observation method in transects (2.5 km long). Relative abundance values were compared with values obtained on surveys carried out during the period June- July 2016. I observed 878 individuals from 38 species during the period January-February 2017, while for the period after the application of tear gas (i.e., June-July 2017) I quantified 1,255 individuals from 28 species. The values for Sørensen’s Similarity Index showed a similar species composition (>80%) among periods. It was observed, however, that the species Phimosus infuscatus, Pitangus sulphuratus and Troglodites aedon were reported as the most common for January-February 2017 period, whereas during the period June-July 2017 the species with the greatest abundance values were Thraupis episcopus, Sicalis flaveola and Tyrannus melancholicus. The differences between the number of individuals observed, greater for species considered characteristics of altered habitats, after the application of tear gas suggest the need to continue developing studies that allow us to understand this little-studied phenomenon for the urban avifauna.

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