Vulnerable birds to collide against wind towers in Rivas, Nicaragua, before construction

A Bird Vulnerability Index (BVI) and Potential Vulnerability Map (PVM) was applied to determine which are the most susceptible bird species to collide with wind towers and the riskiest sites, in a wind power plant south from the city of Rivas. Transects were placed in two areas where the towers woul...

Full description

Bibliographic Details
Published in:Revista Ciencia y Tecnología El Higo
Main Author: Zolotoff Pallais, José Manuel
Format: Article in Journal/Newspaper
Language:Spanish
Published: Universidad Nacional de Ingeniería (UNI) Sede Regional del Norte 2021
Subjects:
Online Access:https://www.camjol.info/index.php/elhigo/article/view/11725
https://doi.org/10.5377/elhigo.v11i1.11725
Description
Summary:A Bird Vulnerability Index (BVI) and Potential Vulnerability Map (PVM) was applied to determine which are the most susceptible bird species to collide with wind towers and the riskiest sites, in a wind power plant south from the city of Rivas. Transects were placed in two areas where the towers would be placed: Grasslands without Trees and Grasslands with Trees. Transects were also made in adjacent habitats such as Lake Nicaragua Coast and Riparian Forest. The BVI was calculated with nine factors (Flight Height, Type of Flight, Wingspan, Weight, Status, Abundance, Reproductive Status, International and National Conservation Status). The total PVM was calculated from all detected species, and average PMV only using species that exceeded the specific BVI median. The risk of habitat collision was calculated by determining that less of 50th percentile is considered to be low risk, and high risk when the percentile is greater than 50. The highest vulnerability index is found in the species: Magnificent Frigatebird (Fregata magnificens), Black Vulture (Coragyps atratus), Turkey Vulture (Cathartes aura), Osprey (Pandion haliaetus), Crested Caracara (Caracara cheriway), Nicaraguan Grackle (Quiscalus nicaraguensis), and Great Heron (Ardea herodias). The riparian forest and grassland with trees are the sites with the highest risk of collision to install wind towers. The BVI and PVM are important tools that allow the identification of potential risks of bird collision with wind towers before their construction. Se aplicó un Índice de Vulnerabilidad de Aves (IVA) y Mapa de Vulnerabilidad Potencial (MVP) para determinar cuáles son las especies de aves más susceptibles a colisionar con torres eólicas y los sitios con mayor riesgo, en una central eólica al sur de la ciudad de Rivas. Se colocaron transectos en dos zonas donde se colocarían las torres: Pastizales sin ‘Árboles y Pastizales con Árboles. También se realizaron transectos en hábitats adyacentes como Costa del lago de Nicaragua y Bosque Ripario. El IVA se calculó con nueve factores (altura de vuelo, tipo de vuelo, longitud de ala, peso, estatus, abundancia, estado reproductivo, estado de conservación internacional y nacional). Se calculó el MVP total a partir de todas las especies detectadas, y MVP medio solo utilizando las especies que superaron la mediana del IVA específico. El riesgo de colisión por hábitat se calculó determinando que menor al percentil 50 se considera de riesgo bajo, y de riesgo alto cuando el percentil sea mayor que 50. Los valores más altos de vulnerabilidad se encuentran en las especies: Rabihorcado Magno (Fregata magnificens), el Zopilote Negro (Coragyps atratus), el Zopilote Cabecirroja (Cathartes aura), Águila Pescadora (Pandion haliaetus), Caracara Crestado (Caracara cheriway), Zanate Nicaragüense (Quiscalus nicaraguensis), y la Garza Grande (Ardea herodias). El bosque ripario y pastizales con árboles son los sitios con mayor riesgo de colisión para instalar torres eólicas. El IVA y MVP constituyen herramientas importantes que permiten identificar los riesgos potenciales de colisión de aves en centrales eólicas antes de su construcción.