Population size and demographic parameters of pantropical spotted dolphin (Stenella attenuata graffmani) (Cetartiodactyla: Delphinidae) in Golfo Dulce, Costa Rica

Introduction: The coastal form of pantropical spotted dolphins (Stenella attenuata graffmani) is commonly found along the Pacific coast of Costa Rica. Within Golfo Dulce, a fiord-like-embayment bordering the Osa Peninsula, pantropical spotted dolphins are sympatric with inshore bottlenose dolphins (...

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Autores: Oviedo Correa, Lenin, Herra-Miranda, David, Pacheco-Polanco, Juan Diego
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:Costa Rica
Institución:Universidad de Costa Rica
Repositorio:Portal de Revistas UCR
Idioma:inglés
OAI Identifier:oai:portal.ucr.ac.cr:article/57287
Acceso en línea:https://revistas.ucr.ac.cr/index.php/rbt/article/view/57287
Access Level:acceso abierto
Palabra clave:Golfo Dulce; Stenella attenuatta graffmani; population size; survival; robust design; Costa Rica; photoidentification.
Golfo Dulce; Stenella attenuatta graffmani; tamaño poblacional; sobrevivencia; diseño robusto; Costa Rica; fotoidentificación.
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repository_id_str
dc.title.none.fl_str_mv Population size and demographic parameters of pantropical spotted dolphin (Stenella attenuata graffmani) (Cetartiodactyla: Delphinidae) in Golfo Dulce, Costa Rica
Tamaño poblacional y parámetros demográficos del delfín manchado pantropical (Stenella attenuata graffmani) (Cetartiodactyla: Delphinidae) en el Golfo Dulce, Costa Rica
title Population size and demographic parameters of pantropical spotted dolphin (Stenella attenuata graffmani) (Cetartiodactyla: Delphinidae) in Golfo Dulce, Costa Rica
spellingShingle Population size and demographic parameters of pantropical spotted dolphin (Stenella attenuata graffmani) (Cetartiodactyla: Delphinidae) in Golfo Dulce, Costa Rica
Oviedo Correa, Lenin
Golfo Dulce; Stenella attenuatta graffmani; population size; survival; robust design; Costa Rica; photoidentification.
Golfo Dulce; Stenella attenuatta graffmani; tamaño poblacional; sobrevivencia; diseño robusto; Costa Rica; fotoidentificación.
title_short Population size and demographic parameters of pantropical spotted dolphin (Stenella attenuata graffmani) (Cetartiodactyla: Delphinidae) in Golfo Dulce, Costa Rica
title_full Population size and demographic parameters of pantropical spotted dolphin (Stenella attenuata graffmani) (Cetartiodactyla: Delphinidae) in Golfo Dulce, Costa Rica
title_fullStr Population size and demographic parameters of pantropical spotted dolphin (Stenella attenuata graffmani) (Cetartiodactyla: Delphinidae) in Golfo Dulce, Costa Rica
title_full_unstemmed Population size and demographic parameters of pantropical spotted dolphin (Stenella attenuata graffmani) (Cetartiodactyla: Delphinidae) in Golfo Dulce, Costa Rica
title_sort Population size and demographic parameters of pantropical spotted dolphin (Stenella attenuata graffmani) (Cetartiodactyla: Delphinidae) in Golfo Dulce, Costa Rica
dc.creator.none.fl_str_mv Oviedo Correa, Lenin
Herra-Miranda, David
Pacheco-Polanco, Juan Diego
author Oviedo Correa, Lenin
author_facet Oviedo Correa, Lenin
Herra-Miranda, David
Pacheco-Polanco, Juan Diego
author_role author
author2 Herra-Miranda, David
Pacheco-Polanco, Juan Diego
author2_role author
author
dc.subject.none.fl_str_mv Golfo Dulce; Stenella attenuatta graffmani; population size; survival; robust design; Costa Rica; photoidentification.
Golfo Dulce; Stenella attenuatta graffmani; tamaño poblacional; sobrevivencia; diseño robusto; Costa Rica; fotoidentificación.
topic Golfo Dulce; Stenella attenuatta graffmani; population size; survival; robust design; Costa Rica; photoidentification.
Golfo Dulce; Stenella attenuatta graffmani; tamaño poblacional; sobrevivencia; diseño robusto; Costa Rica; fotoidentificación.
description Introduction: The coastal form of pantropical spotted dolphins (Stenella attenuata graffmani) is commonly found along the Pacific coast of Costa Rica. Within Golfo Dulce, a fiord-like-embayment bordering the Osa Peninsula, pantropical spotted dolphins are sympatric with inshore bottlenose dolphins (Tursiops truncatus) and these marine predators provide an important source of revenue for local communities through boat-based tours. Objective: Here we estimated the population size and demographic parameters of the coastal pantropical spotted dolphins in Golfo Dulce. Methods: The study area was surveyed using non-random boat surveys. Upon encounter, dolphins were individually photo-identified using natural marks in their dorsal fins to estimate population abundance and survival using three emigration scenarios. Results: A total of 280 dolphins were photoidentified, 65 % of which were observed only once. A total of 30 models were produced, and only two were considered to be parsimonious. Both models explain seasonal apparent survival and its variation due to heterogeneity in capture-recapture probability, one under no emigration (ΔQAICc = 0.00) and the other under random emigration (ΔQAICc = 1.72). We deemed the latter to be a more realistic model as it better reflects our in-situ observations. Under this preferred model the population size of pantropical spotted dolphins in Golfo Dulce varied from 187.30 individuals (CI: 168.67 – 208.02, CV: 0.11) to 367.88 individuals (CI: 341.51 – 396.31, CV: 0.07), with no significant differences in abundance due to seasonality and very high apparent survival (S = 0.98, CI: 0.68 – 0.99, SE: 0.02). Conclusions: The number of identified dolphins and the proportion of individuals seen only once suggest the fluid movement of the population in and out of the gulf. However, the population size and demographic estimates are characterized by several identified individuals regularly recaptured inside the gulf. This group of dolphins appears to favor the inner basin as a critical foraging habitat. Given the increase of anthropogenic impacts within Golfo Dulce, future management and conservation efforts will require the recognition of an ecologically discrete population unit of coastal pantropical spotted dolphins within the gulf.
publishDate 2023
dc.date.none.fl_str_mv 2023-10-26
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
Article
artículo original
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info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://revistas.ucr.ac.cr/index.php/rbt/article/view/57287
10.15517/rev.biol.trop..v71iS4.57287
url https://revistas.ucr.ac.cr/index.php/rbt/article/view/57287
identifier_str_mv 10.15517/rev.biol.trop..v71iS4.57287
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://revistas.ucr.ac.cr/index.php/rbt/article/view/57287/57838
https://revistas.ucr.ac.cr/index.php/rbt/article/view/57287/57839
https://revistas.ucr.ac.cr/index.php/rbt/article/view/57287/57842
dc.rights.none.fl_str_mv http://creativecommons.org/licenses/by/4.0
acceso abierto
http://purl.org/coar/access_right/c_abf2
info:eu-repo/semantics/openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0
acceso abierto
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
text/html
application/epub+zip
dc.publisher.none.fl_str_mv Universidad de Costa Rica
publisher.none.fl_str_mv Universidad de Costa Rica
dc.source.none.fl_str_mv Revista de Biología Tropical; Vol. 71 No. S4 (2023): Aquatic Mammals of Central América; e57287
Revista de Biología Tropical; Vol. 71 Núm. S4 (2023): Mamíferos acuáticos de Centroamérica; e57287
Revista Biología Tropical; Vol. 71 N.º S4 (2023): Mamíferos acuáticos de Centroamérica; e57287
2215-2075
0034-7744
10.15517/rev.biol.trop..v71iS4.2023
reponame:Portal de Revistas UCR
instname:Universidad de Costa Rica
instacron:UCR
instname_str Universidad de Costa Rica
instacron_str UCR
institution UCR
reponame_str Portal de Revistas UCR
collection Portal de Revistas UCR
repository.name.fl_str_mv Portal de Revistas UCR - Universidad de Costa Rica
repository.mail.fl_str_mv jorge.polanco@ucr.ac.cr
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spelling Population size and demographic parameters of pantropical spotted dolphin (Stenella attenuata graffmani) (Cetartiodactyla: Delphinidae) in Golfo Dulce, Costa RicaTamaño poblacional y parámetros demográficos del delfín manchado pantropical (Stenella attenuata graffmani) (Cetartiodactyla: Delphinidae) en el Golfo Dulce, Costa RicaOviedo Correa, LeninHerra-Miranda, DavidPacheco-Polanco, Juan DiegoGolfo Dulce; Stenella attenuatta graffmani; population size; survival; robust design; Costa Rica; photoidentification.Golfo Dulce; Stenella attenuatta graffmani; tamaño poblacional; sobrevivencia; diseño robusto; Costa Rica; fotoidentificación.Introduction: The coastal form of pantropical spotted dolphins (Stenella attenuata graffmani) is commonly found along the Pacific coast of Costa Rica. Within Golfo Dulce, a fiord-like-embayment bordering the Osa Peninsula, pantropical spotted dolphins are sympatric with inshore bottlenose dolphins (Tursiops truncatus) and these marine predators provide an important source of revenue for local communities through boat-based tours. Objective: Here we estimated the population size and demographic parameters of the coastal pantropical spotted dolphins in Golfo Dulce. Methods: The study area was surveyed using non-random boat surveys. Upon encounter, dolphins were individually photo-identified using natural marks in their dorsal fins to estimate population abundance and survival using three emigration scenarios. Results: A total of 280 dolphins were photoidentified, 65 % of which were observed only once. A total of 30 models were produced, and only two were considered to be parsimonious. Both models explain seasonal apparent survival and its variation due to heterogeneity in capture-recapture probability, one under no emigration (ΔQAICc = 0.00) and the other under random emigration (ΔQAICc = 1.72). We deemed the latter to be a more realistic model as it better reflects our in-situ observations. Under this preferred model the population size of pantropical spotted dolphins in Golfo Dulce varied from 187.30 individuals (CI: 168.67 – 208.02, CV: 0.11) to 367.88 individuals (CI: 341.51 – 396.31, CV: 0.07), with no significant differences in abundance due to seasonality and very high apparent survival (S = 0.98, CI: 0.68 – 0.99, SE: 0.02). Conclusions: The number of identified dolphins and the proportion of individuals seen only once suggest the fluid movement of the population in and out of the gulf. However, the population size and demographic estimates are characterized by several identified individuals regularly recaptured inside the gulf. This group of dolphins appears to favor the inner basin as a critical foraging habitat. Given the increase of anthropogenic impacts within Golfo Dulce, future management and conservation efforts will require the recognition of an ecologically discrete population unit of coastal pantropical spotted dolphins within the gulf.Introducción: La forma costera del delfín manchado pantropical (Stenella attenuata graffmani) se encuentra comúnmente a lo largo de la costa Pacífica de Costa Rica. En el Golfo Dulce, una bahía similar a un fiordo en la Península de Osa, los delfines manchados pantropicales son simpátricos con los delfines nariz de botella costeros (Tursiops truncatus) y estos depredadores marinos proporcionan una importante fuente de ingresos para las comunidades locales a través de actividades de avistamientos ecoturísticos. Objetivo: Se estimó el tamaño de la población y los parámetros demográficos de los delfines manchados pantropicales costeros para el Golfo Dulce. Métodos: El área de estudio se estudió mediante muestreos no aleatorios desde embarcaciones. Tras el encuentro, los delfines fueron foto-identificados individualmente usando marcas naturales en sus aletas dorsales, para estimar la abundancia y supervivencia de la población usando tres escenarios posibles de emigración. Resultados: Un total de 280 delfines fueron foto-identificados, 65 % de los cuales fueron observados una sola vez. Se elaboraron un total de 30 modelos, y sólo dos se consideraron parsimoniosos. Ambos modelos explican la supervivencia estacional aparente y su variación debido a la heterogeneidad en la probabilidad de captura-recaptura, uno bajo emigración nula (ΔQAICc = 0.00) y el otro bajo emigración aleatoria (ΔQAICc = 1.72). Consideramos que este último es un modelo más realista, ya que refleja mejor nuestras observaciones in situ. Bajo este modelo seleccionado, el tamaño de la población de delfines manchados pantropicales en el Golfo Dulce varió de 187.30 individuos (CI: 168.67 – 208.02, CV: 0.11) a 367.88 individuos (CI: 341.51 – 396.31, CV: 0.07), sin diferencias significativas en la abundancia debido a la estacionalidad y una supervivencia aparente muy alta (S = 0.98, CI: 0.68 – 0.99, SE: 0.02). Conclusiones: El número de delfines identificados y la proporción de individuos vistos una sola vez sugieren un movimiento fluido de la población dentro y fuera del golfo. Sin embargo, el tamaño de la población y las estimaciones demográficas se caracterizan por varios individuos identificados y re-capturados regularmente dentro del golfo. Este grupo de delfines parece favorecer la cuenca interior como hábitat crítico de alimentación. Dado el incremento de los impactos antropogénicos dentro del Golfo Dulce, los futuros esfuerzos de manejo y conservación requerirán el reconocimiento de una unidad poblacional ecológicamente discreta del delfín manchado pantropical costero dentro del golfo.Universidad de Costa Rica2023-10-26info:eu-repo/semantics/publishedVersionArticleartículo originalhttp://purl.org/coar/resource_type/c_2df8fbb1info:eu-repo/semantics/articleapplication/pdftext/htmlapplication/epub+ziphttps://revistas.ucr.ac.cr/index.php/rbt/article/view/5728710.15517/rev.biol.trop..v71iS4.57287Revista de Biología Tropical; Vol. 71 No. S4 (2023): Aquatic Mammals of Central América; e57287Revista de Biología Tropical; Vol. 71 Núm. S4 (2023): Mamíferos acuáticos de Centroamérica; e57287Revista Biología Tropical; Vol. 71 N.º S4 (2023): Mamíferos acuáticos de Centroamérica; e572872215-20750034-774410.15517/rev.biol.trop..v71iS4.2023reponame:Portal de Revistas UCRinstname:Universidad de Costa Ricainstacron:UCRenghttps://revistas.ucr.ac.cr/index.php/rbt/article/view/57287/57838https://revistas.ucr.ac.cr/index.php/rbt/article/view/57287/57839https://revistas.ucr.ac.cr/index.php/rbt/article/view/57287/57842http://creativecommons.org/licenses/by/4.0acceso abiertohttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccess2023-10-30T15:39:35Zoai:portal.ucr.ac.cr:article/57287Portal de revistashttps://revistas.ucr.ac.cr/Universidadhttp://www.ucr.ac.crhttps://revistas.ucr.ac.cr/index.php/index/oaijorge.polanco@ucr.ac.crCosta RicaNo aplicaNo aplicaNo aplicaopendoar:2025-08-13T10:26:14Portal de Revistas UCR - Universidad de Costa Ricafalse
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