Roadside Car Surveys: Methodological Constraints and Solutions for Estimating Parrot Abundances across the World

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...

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Autores: Tella, José L., Romero Vidal, Pedro, Dénes, Francisco V., Hiraldo, Fernando, Toledo, Bernardo, Rossetto, Federica, Blanco Hervás, Guillermo, Hernández Brito, Dailos, Luna Fernández, Álvaro, Carrete, Martina, Et al.
Tipo de recurso: artículo
Fecha de publicación:2021
País:España
Institución:Universidad Europea (UEM)
Repositorio:ABACUS. Repositorio de Producción Científica
Idioma:inglés
OAI Identifier:oai:abacus.universidadeuropea.com:11268/12236
Acceso en línea:http://hdl.handle.net/11268/12236
Access Level:acceso abierto
Palabra clave:Psittaciformes
Veterinaria
Ave
Censo de población
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spelling Roadside Car Surveys: Methodological Constraints and Solutions for Estimating Parrot Abundances across the WorldTella, José L.Romero Vidal, PedroDénes, Francisco V.Hiraldo, FernandoToledo, BernardoRossetto, FedericaBlanco Hervás, GuillermoHernández Brito, DailosLuna Fernández, ÁlvaroCarrete, MartinaEt al.PsittaciformesVeterinariaAveCenso de poblaciónParrots 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.20232023-07-2820212021-01-0120212021-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/11268/12236reponame:ABACUS. Repositorio de Producción Científicainstname:Universidad Europea (UEM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Atribución 4.0 Internacionalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:abacus.universidadeuropea.com:11268/122362026-06-11T12:41:27Z
dc.title.none.fl_str_mv Roadside Car Surveys: Methodological Constraints and Solutions for Estimating Parrot Abundances across the World
title Roadside Car Surveys: Methodological Constraints and Solutions for Estimating Parrot Abundances across the World
spellingShingle Roadside Car Surveys: Methodological Constraints and Solutions for Estimating Parrot Abundances across the World
Tella, José L.
Psittaciformes
Veterinaria
Ave
Censo de población
title_short Roadside Car Surveys: Methodological Constraints and Solutions for Estimating Parrot Abundances across the World
title_full Roadside Car Surveys: Methodological Constraints and Solutions for Estimating Parrot Abundances across the World
title_fullStr Roadside Car Surveys: Methodological Constraints and Solutions for Estimating Parrot Abundances across the World
title_full_unstemmed Roadside Car Surveys: Methodological Constraints and Solutions for Estimating Parrot Abundances across the World
title_sort Roadside Car Surveys: Methodological Constraints and Solutions for Estimating Parrot Abundances across the World
dc.creator.none.fl_str_mv Tella, José L.
Romero Vidal, Pedro
Dénes, Francisco V.
Hiraldo, Fernando
Toledo, Bernardo
Rossetto, Federica
Blanco Hervás, Guillermo
Hernández Brito, Dailos
Luna Fernández, Álvaro
Carrete, Martina
Et al.
author Tella, José L.
author_facet Tella, José L.
Romero Vidal, Pedro
Dénes, Francisco V.
Hiraldo, Fernando
Toledo, Bernardo
Rossetto, Federica
Blanco Hervás, Guillermo
Hernández Brito, Dailos
Luna Fernández, Álvaro
Carrete, Martina
Et al.
author_role author
author2 Romero Vidal, Pedro
Dénes, Francisco V.
Hiraldo, Fernando
Toledo, Bernardo
Rossetto, Federica
Blanco Hervás, Guillermo
Hernández Brito, Dailos
Luna Fernández, Álvaro
Carrete, Martina
Et al.
author2_role author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv
dc.subject.none.fl_str_mv Psittaciformes
Veterinaria
Ave
Censo de población
topic Psittaciformes
Veterinaria
Ave
Censo de población
description 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.
publishDate 2021
dc.date.none.fl_str_mv 2021
2021-01-01
2021
2021-01-01
2023
2023-07-28
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/11268/12236
url http://hdl.handle.net/11268/12236
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución 4.0 Internacional
http://creativecommons.org/licenses/by/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución 4.0 Internacional
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:ABACUS. Repositorio de Producción Científica
instname:Universidad Europea (UEM)
instname_str Universidad Europea (UEM)
reponame_str ABACUS. Repositorio de Producción Científica
collection ABACUS. Repositorio de Producción Científica
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.300719

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