Sources of variation in a two-step monitoring protocol for species clustered in conspicuous points: Dolichotis patagonum as a case study

Autores
Alonso Roldán, Virginia; Bossio, Luisina; Galvan, David Edgardo
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
In species showing distributions attached to particular features of the landscape or conspicuous signs, counts are commonly made by making focal observations where animals concentrate. However, to obtain density estimates for a given area, independent searching for signs and occupancy rates of suitable sites is needed. In both cases, it is important to estimate detection probability and other possible sources of variation to avoid confounding effects on measurements of abundance variation. Our objective was to assess possible bias and sources of variation in a two-step protocol in which random designs were applied to search for signs while continuously recording video cameras were used to perform abundance counts where animals are concentrated, using mara (Dolichotis patagonum) as a case study. The protocol was successfully applied to maras within the Península Valdés protected area, given that the protocol was logistically suitable, allowed warrens to befound, the associated adults to be counted, and the detection probability to be estimated. Variability was documented in both components of the two-step protocol. These sources of variation should be taken into account when applying this protocol. Warren detectability was approximately 80% with little variation. Factors related to false positive detection were more important than imperfect detection. The detectability for individuals was approximately 90% using the entire day of observations. The shortest sampling period with a similar detection capacity than a day was approximately 10 hours, and during this period, the visiting dynamicdid not show trends. For individual mara, the detection capacity of the camera wasnot significantly different from the observer during fieldwork. The presence of the camera did not affect the visiting behavior of adults to the warren. Application of this protocol will allow monitoring of the near-threatened mara providing a minimum local population size and a baseline for measuring long-term trends.
Fil: Alonso Roldán, Virginia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
Fil: Bossio, Luisina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina
Fil: Galvan, David Edgardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
Materia
PATAGONIA
MIXED MODELS
ABUNDANCE
VIDEO
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/5614

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spelling Sources of variation in a two-step monitoring protocol for species clustered in conspicuous points: Dolichotis patagonum as a case studyAlonso Roldán, VirginiaBossio, LuisinaGalvan, David EdgardoPATAGONIAMIXED MODELSABUNDANCEVIDEOhttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1In species showing distributions attached to particular features of the landscape or conspicuous signs, counts are commonly made by making focal observations where animals concentrate. However, to obtain density estimates for a given area, independent searching for signs and occupancy rates of suitable sites is needed. In both cases, it is important to estimate detection probability and other possible sources of variation to avoid confounding effects on measurements of abundance variation. Our objective was to assess possible bias and sources of variation in a two-step protocol in which random designs were applied to search for signs while continuously recording video cameras were used to perform abundance counts where animals are concentrated, using mara (Dolichotis patagonum) as a case study. The protocol was successfully applied to maras within the Península Valdés protected area, given that the protocol was logistically suitable, allowed warrens to befound, the associated adults to be counted, and the detection probability to be estimated. Variability was documented in both components of the two-step protocol. These sources of variation should be taken into account when applying this protocol. Warren detectability was approximately 80% with little variation. Factors related to false positive detection were more important than imperfect detection. The detectability for individuals was approximately 90% using the entire day of observations. The shortest sampling period with a similar detection capacity than a day was approximately 10 hours, and during this period, the visiting dynamicdid not show trends. For individual mara, the detection capacity of the camera wasnot significantly different from the observer during fieldwork. The presence of the camera did not affect the visiting behavior of adults to the warren. Application of this protocol will allow monitoring of the near-threatened mara providing a minimum local population size and a baseline for measuring long-term trends.Fil: Alonso Roldán, Virginia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; ArgentinaFil: Bossio, Luisina. Universidad Nacional de la Patagonia "San Juan Bosco"; ArgentinaFil: Galvan, David Edgardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; ArgentinaPublic Library Of Science2015-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/5614Alonso Roldán, Virginia; Bossio, Luisina; Galvan, David Edgardo; Sources of variation in a two-step monitoring protocol for species clustered in conspicuous points: Dolichotis patagonum as a case study; Public Library Of Science; Plos One; 10; 5; 5-2015; 1-151932-6203enginfo:eu-repo/semantics/altIdentifier/url/http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0128133info:eu-repo/semantics/altIdentifier/url/http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4444103/info:eu-repo/semantics/altIdentifier/doi/info:eu-repo/semantics/altIdentifier/doi/10.1371%2Fjournal.pone.0128133info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:00:04Zoai:ri.conicet.gov.ar:11336/5614instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:00:04.311CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Sources of variation in a two-step monitoring protocol for species clustered in conspicuous points: Dolichotis patagonum as a case study
title Sources of variation in a two-step monitoring protocol for species clustered in conspicuous points: Dolichotis patagonum as a case study
spellingShingle Sources of variation in a two-step monitoring protocol for species clustered in conspicuous points: Dolichotis patagonum as a case study
Alonso Roldán, Virginia
PATAGONIA
MIXED MODELS
ABUNDANCE
VIDEO
title_short Sources of variation in a two-step monitoring protocol for species clustered in conspicuous points: Dolichotis patagonum as a case study
title_full Sources of variation in a two-step monitoring protocol for species clustered in conspicuous points: Dolichotis patagonum as a case study
title_fullStr Sources of variation in a two-step monitoring protocol for species clustered in conspicuous points: Dolichotis patagonum as a case study
title_full_unstemmed Sources of variation in a two-step monitoring protocol for species clustered in conspicuous points: Dolichotis patagonum as a case study
title_sort Sources of variation in a two-step monitoring protocol for species clustered in conspicuous points: Dolichotis patagonum as a case study
dc.creator.none.fl_str_mv Alonso Roldán, Virginia
Bossio, Luisina
Galvan, David Edgardo
author Alonso Roldán, Virginia
author_facet Alonso Roldán, Virginia
Bossio, Luisina
Galvan, David Edgardo
author_role author
author2 Bossio, Luisina
Galvan, David Edgardo
author2_role author
author
dc.subject.none.fl_str_mv PATAGONIA
MIXED MODELS
ABUNDANCE
VIDEO
topic PATAGONIA
MIXED MODELS
ABUNDANCE
VIDEO
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv In species showing distributions attached to particular features of the landscape or conspicuous signs, counts are commonly made by making focal observations where animals concentrate. However, to obtain density estimates for a given area, independent searching for signs and occupancy rates of suitable sites is needed. In both cases, it is important to estimate detection probability and other possible sources of variation to avoid confounding effects on measurements of abundance variation. Our objective was to assess possible bias and sources of variation in a two-step protocol in which random designs were applied to search for signs while continuously recording video cameras were used to perform abundance counts where animals are concentrated, using mara (Dolichotis patagonum) as a case study. The protocol was successfully applied to maras within the Península Valdés protected area, given that the protocol was logistically suitable, allowed warrens to befound, the associated adults to be counted, and the detection probability to be estimated. Variability was documented in both components of the two-step protocol. These sources of variation should be taken into account when applying this protocol. Warren detectability was approximately 80% with little variation. Factors related to false positive detection were more important than imperfect detection. The detectability for individuals was approximately 90% using the entire day of observations. The shortest sampling period with a similar detection capacity than a day was approximately 10 hours, and during this period, the visiting dynamicdid not show trends. For individual mara, the detection capacity of the camera wasnot significantly different from the observer during fieldwork. The presence of the camera did not affect the visiting behavior of adults to the warren. Application of this protocol will allow monitoring of the near-threatened mara providing a minimum local population size and a baseline for measuring long-term trends.
Fil: Alonso Roldán, Virginia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
Fil: Bossio, Luisina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina
Fil: Galvan, David Edgardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
description In species showing distributions attached to particular features of the landscape or conspicuous signs, counts are commonly made by making focal observations where animals concentrate. However, to obtain density estimates for a given area, independent searching for signs and occupancy rates of suitable sites is needed. In both cases, it is important to estimate detection probability and other possible sources of variation to avoid confounding effects on measurements of abundance variation. Our objective was to assess possible bias and sources of variation in a two-step protocol in which random designs were applied to search for signs while continuously recording video cameras were used to perform abundance counts where animals are concentrated, using mara (Dolichotis patagonum) as a case study. The protocol was successfully applied to maras within the Península Valdés protected area, given that the protocol was logistically suitable, allowed warrens to befound, the associated adults to be counted, and the detection probability to be estimated. Variability was documented in both components of the two-step protocol. These sources of variation should be taken into account when applying this protocol. Warren detectability was approximately 80% with little variation. Factors related to false positive detection were more important than imperfect detection. The detectability for individuals was approximately 90% using the entire day of observations. The shortest sampling period with a similar detection capacity than a day was approximately 10 hours, and during this period, the visiting dynamicdid not show trends. For individual mara, the detection capacity of the camera wasnot significantly different from the observer during fieldwork. The presence of the camera did not affect the visiting behavior of adults to the warren. Application of this protocol will allow monitoring of the near-threatened mara providing a minimum local population size and a baseline for measuring long-term trends.
publishDate 2015
dc.date.none.fl_str_mv 2015-05
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/5614
Alonso Roldán, Virginia; Bossio, Luisina; Galvan, David Edgardo; Sources of variation in a two-step monitoring protocol for species clustered in conspicuous points: Dolichotis patagonum as a case study; Public Library Of Science; Plos One; 10; 5; 5-2015; 1-15
1932-6203
url http://hdl.handle.net/11336/5614
identifier_str_mv Alonso Roldán, Virginia; Bossio, Luisina; Galvan, David Edgardo; Sources of variation in a two-step monitoring protocol for species clustered in conspicuous points: Dolichotis patagonum as a case study; Public Library Of Science; Plos One; 10; 5; 5-2015; 1-15
1932-6203
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0128133
info:eu-repo/semantics/altIdentifier/url/http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4444103/
info:eu-repo/semantics/altIdentifier/doi/
info:eu-repo/semantics/altIdentifier/doi/10.1371%2Fjournal.pone.0128133
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Public Library Of Science
publisher.none.fl_str_mv Public Library Of Science
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
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reponame_str CONICET Digital (CONICET)
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