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. 2023 Dec 11:11:e16533.
doi: 10.7717/peerj.16533. eCollection 2023.

The Andean Ibis (Theristicus branickii) in South America: potential distribution, presence in protected areas and anthropic threats

Nivia Luzuriaga-Neira  1 , Keenan Ennis  2 , Michaël A J Moens  3 , Jose Leon  3 , Nathaly Reyes  1 , Agusto Luzuriaga-Neira  4   5 , Jaime R Rau  6 , Roxana Rojas-VeraPinto  7
Affiliations

The Andean Ibis (Theristicus branickii) in South America: potential distribution, presence in protected areas and anthropic threats

Nivia Luzuriaga-Neira et al. PeerJ. .

Abstract

The avifauna of South America is one of the most widely studied groups of vertebrates. However, certain species, such as the Andean Ibis (Theristicus branickii), have received limited attention regarding their ecological patterns, biology, current distribution, and environmental requirements. This study analyzed observation data from the Global Biodiversity Information Facility (GBIF) on the Andean Ibis in four countries to identify and understand critical variables that determine the species' presence, assess the proportion of its habitat within protected areas and identify possible threats to the species. Additionally, this study considered environmental and ecological variables to model ecological niches using the maximum entropy approach in MaxEnt to map the suitable habitat of the species. The findings revealed the extent of suitable Andean Ibis habitats in Ecuador, Peru, Bolivia and Chile. The variables that most determined the presence of the species were: altitude (36.57%), distance to lakes (23.29%) and ecological isothermality (13.34%). The distribution area of the Andean Ibis totaled 300,095.00 km2, spanning both sides of the Andean mountains range. Human activities have left a significant impact on the Andean Ibis habitat, with 48% of this area impacted by the human footprint and only 10% of the territory falling within protected areas designated by the respective countries. The results of this study show that the Andean Ibis presents characteristics of a specialist species due to its adaptation to the climate conditions of the plateau and highlands, including low temperatures, herbaceous vegetation and the presence of water bodies. The species is distributed in disconnected Andean landscape areas, whose functionality could be compromised by increased human activities. Complementary studies will be necessary to understand the ecological role and effectiveness of protected areas for conserving the species.

Keywords: Birds; Footprint; GBIF-data; MaxEnt; Niche Model.

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Conflict of interest statement

Roxana Rojas-VeraPinto, is employed by Isnache Project. Michaël André Jean Moens, was employed by Fundación de Conservación Jocotoco. José León is employed by Fundación de Conservación Jocotoco.

Figures

Figure 1
Figure 1. Records of the presence of the Andean Ibis (Theristicus branickii) in South America between 2003 and 2020.
Data were obtained from GBIF and eBird platforms and specific studies conducted on the species (see references).
Figure 2
Figure 2. Potential distribution of the Andean Ibis (Theristicus branickii) in South America.
Occurrence probability is shown in gradient color (from yellow to red).
Figure 3
Figure 3. Potential distribution of the Andean Ibis (pink) in South America.
(A) Ecuador; (B) Peru; (C) Perú, Chile and Bolivia. National protected areas (green borders) and human footprint areas (light pink; WCS, WC.S. 2005) are included. (A) Human footprint, protected areas and potential distribution in the Ecuadorian and north Peruvian zones; (B) human footprint and protected areas in Peruvian zones, and (C) human footprint, potential distribution and protected areas in southern Peruvian, northeast Bolivia, and north Chile zones.
Figure 4
Figure 4. South American ecoregions (The Nature Conservancy, 2003) and the potential distribution of the Andean Ibis.
Eleven ecoregions are in or near the potential distribution areas of the Andean Ibis.
See this image and copyright information in PMC

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