Estimation and Description of the Minimum Occurrence Area of the White Collared Swift in Argentina

PASSEGGI, J.; LORENZÓN, R.E.; GIRI, F.

Trieste

Conferencia; 7th International Swift Conference; 2024

The White-collared Swift ( Streptoprocne zonaris) is considered a common species in Argentina, although there is sorne uncertainty regarding whether existing presence records accurately represent its actual spatial occurrence. As a first attempt to address this question, in this study we compiled point data on the presence of this species and described the minimum spatial area occupied by this species in Argentina, estimated through the analysis of spatial statistics tools. We identified 682 georeferenced presence points to estimate the Minimum Convex Polygon (MCP) which was defined between 22º-36°S and 54º-?0ºW, occupying 12 provinces covering a total area of 119,272,799 hectares. The median center (centroid) was located at 26º24'S; 64º50W. Additionally, we identified 589 individual presence polygons far S. zonaris considering the proximity of points and Voronoi diagrams resulting in a minimum individual occupancy area of 149 hectares. The results obtained in this work provide novel infarmation to describe the occurrence space far this species in Argentina, although further analyses are necessary to explore alternative techniques, estimators or spatial models to evaluate potential biases arising from the distance metrics used and/or from the particular lifestyle of this species.