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Alan Bermúdez-Cavero
Laboratorio de Biología y Genética, Universidad Nacional de San Cristóbal de Huamanga, Ayacucho 05001, Peru

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Short Biography

I'm a proffesor at University of San Cristóbal of Huamanga

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Journal article
Published: 01 July 2021 in Diversity
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Parrots stand out among birds because of their poor conservation status and the lack of available information on their population sizes and trends. Estimating parrot abundance is complicated by the high mobility, gregariousness, patchy distributions, and rarity of many species. Roadside car surveys can be useful to cover large areas and increase the probability of detecting spatially aggregated species or those occurring at very low densities. However, such surveys may be biased due to their inability to handle differences in detectability among species and habitats. We conducted 98 roadside surveys, covering > 57,000 km across 20 countries and the main world biomes, recording ca. 120,000 parrots from 137 species. We found that larger and more gregarious species are more easily visually detected and at greater distances, with variations among biomes. However, raw estimates of relative parrot abundances (individuals/km) were strongly correlated (r = 0.86–0.93) with parrot densities (individuals/km2) estimated through distance sampling (DS) models, showing that variability in abundances among species (>40 orders of magnitude) overcomes any potential detectability bias. While both methods provide similar results, DS cannot be used to study parrot communities or monitor the population trends of all parrot species as it requires a minimum of encounters that are not reached for most species (64% in our case), mainly the rarest and more threatened. However, DS may be the most suitable choice for some species-specific studies of common species. We summarize the strengths and weaknesses of both methods to guide researchers in choosing the best–fitting option for their particular research hypotheses, characteristics of the species studied, and logistical constraints.

ACS Style

José Tella; Pedro Romero-Vidal; Francisco Dénes; Fernando Hiraldo; Bernardo Toledo; Federica Rossetto; Guillermo Blanco; Dailos Hernández-Brito; Erica Pacífico; José Díaz-Luque; Abraham Rojas; Alan Bermúdez-Cavero; Álvaro Luna; Jomar Barbosa; Martina Carrete. Roadside Car Surveys: Methodological Constraints and Solutions for Estimating Parrot Abundances across the World. Diversity 2021, 13, 300 .

AMA Style

José Tella, Pedro Romero-Vidal, Francisco Dénes, Fernando Hiraldo, Bernardo Toledo, Federica Rossetto, Guillermo Blanco, Dailos Hernández-Brito, Erica Pacífico, José Díaz-Luque, Abraham Rojas, Alan Bermúdez-Cavero, Álvaro Luna, Jomar Barbosa, Martina Carrete. Roadside Car Surveys: Methodological Constraints and Solutions for Estimating Parrot Abundances across the World. Diversity. 2021; 13 (7):300.

Chicago/Turabian Style

José Tella; Pedro Romero-Vidal; Francisco Dénes; Fernando Hiraldo; Bernardo Toledo; Federica Rossetto; Guillermo Blanco; Dailos Hernández-Brito; Erica Pacífico; José Díaz-Luque; Abraham Rojas; Alan Bermúdez-Cavero; Álvaro Luna; Jomar Barbosa; Martina Carrete. 2021. "Roadside Car Surveys: Methodological Constraints and Solutions for Estimating Parrot Abundances across the World." Diversity 13, no. 7: 300.