Brown Pelicans, Pelecanus occidentalis californicus (Aves: Pelecanidae): Five decades with ENSO, dynamic nesting, and contemporary breeding status in the Gulf of California

Brown Pelicans, Pelecanus occidentalis californicus (Aves: Pelecanidae): Five decades with ENSO, dynamic nesting, and contemporary breeding status in the Gulf of California

The California Brown Pelican subspecies (Pelecanus occidentalis californicus) was removed from the US endangered species list in 2009, along with the entire species of Brown Pelican throughout North America. The Gulf of California subpopulation within the entire metapopulation (= subspecies) compris...

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Autores principales: Anderson, Daniel W, Godínez-Reyes, Carlos R, Velarde, Enriqueta, Avalos-Tellez, Rosalía, Ramírez-Delgado, David, Moreno-Prado, Hugo, Bowen, Thomas, Gress, Franklin, Trejo-Ventura, Jesus, Adrean, Lindsay, Meltzer, Lorayne
Formato: Online
Idioma:eng
Publicado: Iniversidad Autónoma de Baja California 2017
Acceso en liña:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2710
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record_format ojs
institution Ciencias Marinas
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language eng
format Online
author Anderson, Daniel W
Godínez-Reyes, Carlos R
Velarde, Enriqueta
Avalos-Tellez, Rosalía
Ramírez-Delgado, David
Moreno-Prado, Hugo
Bowen, Thomas
Gress, Franklin
Trejo-Ventura, Jesus
Adrean, Lindsay
Meltzer, Lorayne
spellingShingle Anderson, Daniel W
Godínez-Reyes, Carlos R
Velarde, Enriqueta
Avalos-Tellez, Rosalía
Ramírez-Delgado, David
Moreno-Prado, Hugo
Bowen, Thomas
Gress, Franklin
Trejo-Ventura, Jesus
Adrean, Lindsay
Meltzer, Lorayne
Brown Pelicans, Pelecanus occidentalis californicus (Aves: Pelecanidae): Five decades with ENSO, dynamic nesting, and contemporary breeding status in the Gulf of California
author_facet Anderson, Daniel W
Godínez-Reyes, Carlos R
Velarde, Enriqueta
Avalos-Tellez, Rosalía
Ramírez-Delgado, David
Moreno-Prado, Hugo
Bowen, Thomas
Gress, Franklin
Trejo-Ventura, Jesus
Adrean, Lindsay
Meltzer, Lorayne
author_sort Anderson, Daniel W
title Brown Pelicans, Pelecanus occidentalis californicus (Aves: Pelecanidae): Five decades with ENSO, dynamic nesting, and contemporary breeding status in the Gulf of California
title_short Brown Pelicans, Pelecanus occidentalis californicus (Aves: Pelecanidae): Five decades with ENSO, dynamic nesting, and contemporary breeding status in the Gulf of California
title_full Brown Pelicans, Pelecanus occidentalis californicus (Aves: Pelecanidae): Five decades with ENSO, dynamic nesting, and contemporary breeding status in the Gulf of California
title_fullStr Brown Pelicans, Pelecanus occidentalis californicus (Aves: Pelecanidae): Five decades with ENSO, dynamic nesting, and contemporary breeding status in the Gulf of California
title_full_unstemmed Brown Pelicans, Pelecanus occidentalis californicus (Aves: Pelecanidae): Five decades with ENSO, dynamic nesting, and contemporary breeding status in the Gulf of California
title_sort brown pelicans, pelecanus occidentalis californicus (aves: pelecanidae): five decades with enso, dynamic nesting, and contemporary breeding status in the gulf of california
description The California Brown Pelican subspecies (Pelecanus occidentalis californicus) was removed from the US endangered species list in 2009, along with the entire species of Brown Pelican throughout North America. The Gulf of California subpopulation within the entire metapopulation (= subspecies) comprises the majority of nesting (~76% of P. o. californicus). The US classifications were based on pollution effects in the Southern California Bight (SCB) during the early 1970s; official listing-recognition in Mexico (NOM-059-SEMARNAT-2010) occurred in 2010 and it continues. Unfortunately, Brown Pelican conservation across the US/Mexico border has been largely uncoordinated. Recent declines in the SCB subpopulation are not well-documented, whereas representative subpopulations in the Gulf of California have received continual study since the US listing. Until the early 2000s, Gulf pelican breeding populations changed little. El Niño/Southern Oscillation continues to be a major factor driving annual pelican breeding intensity and success, with a slightly weaker effect to the north. Nest attempts (NA) in the southern Midriff zone and to the south of our monitoring zone have declined in the last decade, in especially extreme and unprecedented ways in a period of unusual warming in the last 3 years (2014–2016), termed by some as the “Blob”. Other factors (such as human disturbance and commercial fishing) have likely exacerbated recent warming effects in some areas. Recent data also suggest the pelican is in a process of minor range-shifting toward the northern Gulf, and there are no definitive indications of a recent NA decline in that zone. Monitoring over the entire range, past 2016, will be important to determine whether populations have begun a long-term decline or will recover to normal baseline levels. The health of pelican populations is an important indicator of overall ecological health in the Pacific region and not an isolated phenomenon. 
publisher Iniversidad Autónoma de Baja California
publishDate 2017
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2710
_version_ 1797332411580678144
spelling oai:cienciasmarinas.com.mx:article-27102024-04-05T19:16:59Z Brown Pelicans, Pelecanus occidentalis californicus (Aves: Pelecanidae): Five decades with ENSO, dynamic nesting, and contemporary breeding status in the Gulf of California Pelícano pardo, Pelecanus occidentalis californicus (Aves: Pelecanidae): Cinco décadas con ENOS, anidación dinámica y estatus contemporáneo dereproducción en el golfo de California Anderson, Daniel W Godínez-Reyes, Carlos R Velarde, Enriqueta Avalos-Tellez, Rosalía Ramírez-Delgado, David Moreno-Prado, Hugo Bowen, Thomas Gress, Franklin Trejo-Ventura, Jesus Adrean, Lindsay Meltzer, Lorayne The California Brown Pelican subspecies (Pelecanus occidentalis californicus) was removed from the US endangered species list in 2009, along with the entire species of Brown Pelican throughout North America. The Gulf of California subpopulation within the entire metapopulation (= subspecies) comprises the majority of nesting (~76% of P. o. californicus). The US classifications were based on pollution effects in the Southern California Bight (SCB) during the early 1970s; official listing-recognition in Mexico (NOM-059-SEMARNAT-2010) occurred in 2010 and it continues. Unfortunately, Brown Pelican conservation across the US/Mexico border has been largely uncoordinated. Recent declines in the SCB subpopulation are not well-documented, whereas representative subpopulations in the Gulf of California have received continual study since the US listing. Until the early 2000s, Gulf pelican breeding populations changed little. El Niño/Southern Oscillation continues to be a major factor driving annual pelican breeding intensity and success, with a slightly weaker effect to the north. Nest attempts (NA) in the southern Midriff zone and to the south of our monitoring zone have declined in the last decade, in especially extreme and unprecedented ways in a period of unusual warming in the last 3 years (2014–2016), termed by some as the “Blob”. Other factors (such as human disturbance and commercial fishing) have likely exacerbated recent warming effects in some areas. Recent data also suggest the pelican is in a process of minor range-shifting toward the northern Gulf, and there are no definitive indications of a recent NA decline in that zone. Monitoring over the entire range, past 2016, will be important to determine whether populations have begun a long-term decline or will recover to normal baseline levels. The health of pelican populations is an important indicator of overall ecological health in the Pacific region and not an isolated phenomenon.  La subespecie Pelecanus occidentalis californicus (pelícano pardo de California) se eliminó de la lista de especies en peligro de los Estados Unidos en 2009, junto con el resto de la especie en todo Norteamérica. La subpoblación del golfo de California, incluida en la metapoblación (= subespecie), comprende la mayoría de la población anidante (~76% de P. o. californicus). Su inclusión en la lista de especies en peligro de los Estados Unidos se basó en los efectos de la contaminación en la bahía del Sur de California a principios de la década de los años setenta; su inclusión en la lista oficial de México en 2010 (NOM-059-SEMARNAT-2010) aún continúa. Las acciones de conservación del pelícano en ambos lados de la frontera entre México y Estados Unidos no han estado coordinadas. Disminuciones recientes en la subpoblación de la bahía del Sur de California no han sido bien documentadas, mientras que las subpoblaciones representativas del golfo de California han tenido monitoreo continuo a partir de que se enlistó en los Estados Unidos. Desde la primera década de 2000 las poblaciones reproductoras del golfo han cambiado poco. El fenómeno de El Niño/Oscilación del Sur afecta la intensidad de reproducción y éxito reproductivo anual del pelícano, con efectos menores al norte. Los intentos de anidación (IA) en el sur de la Región de las Grandes Islas y al sur de nuestra zona de monitoreo han disminuido en la última década, de forma especialmente extrema y sin precedentes durante el periodo de calentamiento excepcional los últimos 3 años (2014–2016). Otros factores (perturbación humana y pesca comercial) también han exacerbado los efectos del calentamiento en algunas zonas. Datos recientes indican que el pelícano está en un proceso menor de cambio de distribución hacia el norte del golfo; no hay indicaciones concluyentes de la reducción de los IA en esa zona. Para determinar si la población ha iniciado una disminución a largo plazo, o si se recuperará a los niveles normales de línea de base, será importante monitorear en toda el área de distribución después de 2016. La salud de las poblaciones del pelícano es un indicador importante de la salud del ecosistema de la región del Pacífico y no un fenómeno aislado. Iniversidad Autónoma de Baja California 2017-03-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf text/xml text/xml https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2710 10.7773/cm.v43i1.2710 Ciencias Marinas; Vol. 43 No. 1 (2017); 1-34 Ciencias Marinas; Vol. 43 Núm. 1 (2017); 1-34 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2710/1621 https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2710/420420592 https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2710/420420768 Copyright (c) 2017 Ciencias Marinas https://creativecommons.org/licenses/by/4.0

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