12 results on '"CHLOEPHAGA"'
Search Results
2. Evidence of targeted consumption of mosses by birds in sub‐Antarctic South America.
- Author
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Russo, Nicholas J., Robertson, Michael, MacKenzie, Roy, Goffinet, Bernard, and Jiménez, Jaime E.
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MOSSES , *BIRDS , *BRYOPHYTES , *GEESE , *SPECIES , *CHLOROPLAST DNA - Abstract
Bryophyte consumption is uncommon among bird species globally and is often presumed incidental. We sought to determine whether herbivorous bird species of the high Andes, including the white‐bellied seedsnipe (Attagis malouinus) and Chloephaga geese (C. picta and C. poliocephala), consume bryophytes, and if so, how frequently. We collected 26 seedsnipe and 22 goose droppings from alpine and sub‐alpine habitats of Navarino Island, Chile and examined their contents for bryophyte diaspores. We detected bryophyte fragments in 84.6% and 90.9% of seedsnipe and Chloephaga goose faecal samples, respectively. We also extracted DNA from three bryophyte fragments isolated from goose droppings and sequenced three chloroplast loci for each sample. We inferred through a barcoding analysis that at least one species of Chloephaga goose consumes Polytrichum strictum and Notoligotrichum trichodon. The composition of 11 collected goose droppings was >50% Polytrichaceae bryophyte fragments, suggesting that at least one Chloephaga goose species foraged deliberately on moss species of this family. These new observations suggest that bryophytes are part of the diet of some high Andean birds and that birds might disperse bryophytes internally – via endozoochory – in the sub‐Antarctic. [ABSTRACT FROM AUTHOR]
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- 2020
- Full Text
- View/download PDF
3. Impacts of traditional livestock farming on threatened sheldgeese (Chloephaga spp.) in Patagonia
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Natalia A. Cossa, Laura Fasola, Ignacio Roesler, and Juan C. Reboreda
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behavior ,chloephaga ,conservation ,endangered species ,livestock ,nest success ,sheldgeese ,Ecology ,QH540-549.5 - Abstract
Migratory sheldgeese (continental Upland Goose Chloephaga picta, Ashy-headed Goose C. poliocephala, and continental Ruddy-headed Goose C. rubidiceps) are endemic birds of southern South America. They are currently threatened by illegal hunting, overgrazing, and invasive predators. Because their breeding area is intensely grazed by sheep and cows, we studied the interaction of sheldgeese flocks and breeding pairs with livestock in the Tierra del Fuego and Santa Cruz provinces in Patagonia, Argentina. We conducted road-based surveys of sheldgeese flocks and breeding pairs from spring 2013 to summer 2016 to explore sheldgeese behavior. In addition, we monitored Upland Goose nests using camera traps and estimated nest daily survival rates in nests unprotected and protected from livestock with an electric fence. Sheldgeese flocks and breeding pairs were more frequently sighted alone than associated with livestock. Also, when sheldgeese foraged alongside livestock, there were fewer individuals resting and these allocated more time to forage than in the absence of livestock. We did not observe lower individual vigilance in sheldgeese flocks sharing foraging patches with livestock. Nests protected by electric fences had higher daily survival rates than unprotected ones. Our results indicate that one important conservation action should be to identify areas that concentrate a great number of breeding pairs of sheldgeese, and protect them from livestock, mainly during the peak of the reproductive season.
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- 2020
4. Chloephaga picta Magellan
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Gonza �� Lez-Acun, Daniel A. and Palma, Ricardo L.
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Anseriformes ,Chloephaga ,Animalia ,Biodiversity ,Chordata ,Anatidae ,Aves ,Chloephaga picta ,Taxonomy - Abstract
Chloephaga picta (Gmelin, 1789) Magellan goose���Caiqu��n Anaticola marginellus (Piaget, 1885) Anatoecus dentatus (Scopoli, 1763) sensu lato Anatoecus icterodes (Nitzsch, 1818) sensu lato Holomenopon brevithoracicum (Piaget, 1880), Published as part of Gonza �� Lez-Acun, Daniel A. & Palma, Ricardo L., 2021, An annotated catalogue of bird lice (Insecta: Phthiraptera) from Chile, pp. 1-151 in Zootaxa 5077 (1) on page 117, DOI: 10.11646/zootaxa.5077.1.1, http://zenodo.org/record/5766642, {"references":["Piaget, E. (1885) Les Pediculines. Essai Monographique. Supplement. E. J. Brill, Leiden, xvi + 200 pp., 17 pls.","Scopoli, J. A. (1763) Entomologia Carniolica exhibens insecta Carnioliae indigena et distributa in ordines, genera, species, varietates, methodo Linnaeana. Trattner, Wien, xxxvi + 421 pp. https: // doi. org / 10.5962 / bhl. title. 119976","Nitzsch, C. L. (1818) Die Familien und Gattungen der Theierinsekten (Insecta epizoica); als ein Prodromus einer Naturgeschichte derselben. E. F. Germar's Magazin der Entomologie, 3, 261 - 318.","Piaget, E. (1880) Les Pediculines. Essai Monographique. Two volumes. E. J. Brill, Leiden, xxxix + 714 pp., 56 pls."]}
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- 2021
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- View/download PDF
5. Chloephaga melanoptera Andean
- Author
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Gonza �� Lez-Acun, Daniel A. and Palma, Ricardo L.
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Anseriformes ,Chloephaga ,Animalia ,Biodiversity ,Chordata ,Anatidae ,Chloephaga melanoptera ,Aves ,Taxonomy - Abstract
Chloephaga melanoptera (Eyton, 1838) Andean goose���Piuqu��n Holomenopon tadornae (Gervais, 1844), Published as part of Gonza �� Lez-Acun, Daniel A. & Palma, Ricardo L., 2021, An annotated catalogue of bird lice (Insecta: Phthiraptera) from Chile, pp. 1-151 in Zootaxa 5077 (1) on page 117, DOI: 10.11646/zootaxa.5077.1.1, http://zenodo.org/record/5766642, {"references":["Gervais, F. L. P. (1844) Diceres epizoiques. In: Walckenaer, C. A. (Ed.), Histoire Naturelle des Insectes. Apteres. Tome 3. Librairie Encyclopedique de Roret, Paris, pp. 290 - 361, pls. 48 - 49."]}
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- 2021
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6. Demographic history inferred from genome-wide data reveals two lineages of sheldgeese endemic to a glacial refugium in the southern Atlantic.
- Author
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Kopuchian, Cecilia, Campagna, Leonardo, Di Giacomo, Adrián S., Wilson, Robert E., Bulgarella, Mariana, Petracci, Pablo, Mazar Barnett, Juan, Matus, Ricardo, Blank, Olivia, and McCracken, Kevin G.
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CHLOEPHAGA poliocephala , *TAXONOMY , *BIOGEOGRAPHY , *PHYLOGENY , *ENDANGERED species - Abstract
Aim: The Malvinas/Falkland Islands (MFI) constitute the largest archipelago in the southern Atlantic, and harbour endemic lineages that presumably evolved after sea-level rise, associated with glacial periods, isolated ancestral populations. We investigate the role of the MFI in isolating populations from continental counterparts of two highly vagile species: the sheldgeese Chloephaga picta and Chloephaga rubidiceps. Location: Patagonia and the Malvinas/Falkland Islands. Methods: We sampled C. picta and C. rubidiceps on the continent and MFI. Using a reduced-representation genomic approach, we quantified the genetic differentiation between insular and continental populations of both species, and used coalescent-based analyses to model their demography. Results: The MFI harbour independently evolving lineages of C. picta and C. rubidiceps, which diverged from their continental counterparts during the Middle-Late Pleistocene and have since experienced negligible gene flow. Main conclusions: The c. 450 km that separate the archipelago from the continent are sufficient to isolate populations of these putatively highly vagile species. Ancestral lineages may have reached the MFI refugium during glacial cycles. Without conservation measures, the drastic decline of the morphologically, behaviourally and ecologically distinct continental population of C. rubidiceps, to < 1000 individuals, may lead to the extinction of an independently evolving taxon. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
7. Impacts of traditional livestock farming on threatened sheldgeese (Chloephaga spp.) in Patagonia
- Author
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Ignacio Roesler, Laura Fasola, Juan C. Reboreda, and Natalia A. Cossa
- Subjects
Endangered species ,sheldgeese ,SB1-1110 ,chloephaga ,GE1-350 ,QK900-989 ,Plant ecology ,Ecology, Evolution, Behavior and Systematics ,Nature and Landscape Conservation ,Ecology ,Agroforestry ,business.industry ,behavior ,conservation ,Plant culture ,endangered species ,livestock ,Environmental sciences ,Livestock farming ,Geography ,Threatened species ,Animal Science and Zoology ,Livestock ,nest success ,business - Abstract
Migratory sheldgeese (continental Upland Goose Chloephaga picta, Ashy-headed Goose C. poliocephala, and continental Ruddy-headed Goose C. rubidiceps) are endemic birds of southern South America. They are currently threatened by illegal hunting, overgrazing, and invasive predators. Because their breeding area is intensely grazed by sheep and cows, we studied the interaction of sheldgeese flocks and breeding pairs with livestock in the Tierra del Fuego and Santa Cruz provinces in Patagonia, Argentina. We conducted road-based surveys of sheldgeese flocks and breeding pairs from spring 2013 to summer 2016 to explore sheldgeese behavior. In addition, we monitored Upland Goose nests using camera traps and estimated nest daily survival rates in nests unprotected and protected from livestock with an electric fence. Sheldgeese flocks and breeding pairs were more frequently sighted alone than associated with livestock. Also, when sheldgeese foraged alongside livestock, there were fewer individuals resting and these allocated more time to forage than in the absence of livestock. We did not observe lower individual vigilance in sheldgeese flocks sharing foraging patches with livestock. Nests protected by electric fences had higher daily survival rates than unprotected ones. Our results indicate that one important conservation action should be to identify areas that concentrate a great number of breeding pairs of sheldgeese, and protect them from livestock, mainly during the peak of the reproductive season.
- Published
- 2020
8. Dieta del ganso andino (Oressochen Melanopterus) (aves: anatidae) en los bofedales de la localidad de Chalhuanca, distrito de Yanque, provincia de Caylloma, departamento de Arequipa
- Author
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Yurivilca Zapata, William Alex and López Tejeda, Evaristo Luciano
- Subjects
Anseriformes ,Distichia ,Chloephaga ,purl.org/pe-repo/ocde/ford#1.06.11 [https] ,Huallata ,Humedal altoandino ,Anatidae - Abstract
La Subcuenca Chalhuanca comprende áreas y ecosistemas andinos, que aún no han sido debidamente explorados y estudiados, por lo que su potencial biológico es aún desconocido. Es prioritaria la conservación de sus ecosistemas y su biodiversidad, pues abarca la cabecera de la Cuenca Quilca-Chili, y la zona de amortiguamiento de la Reserva Nacional de Salinas y Aguada Blanca. Este estudio busca contribuir al conocimiento acerca de los hábitos alimenticios de Ganso Andino (Oressochen melanopterus), una especie nativa de los Andes, muy ligada y restringida a los bofedades existentes en la misma. Se colectaron muestras recientes de fecas de Ganso Andino, en los bofedales de la cabecera de la Subcuenca Chalhuanca, para luego ser analizadas en el laboratorio con ayuda de un estereoscopio. Se registraron especies de plantas acuáticas que evidencian la preferencia herbívora del Ganso Andino, con un 99.9% de ocurrencias de elementos vegetales en su dieta. Las hojas (68 %) y la fibra vegetal (28 %) abarcan la mayor parte del volumen de las fecas. Destacando los géneros Lilaeopsis, Werneria y Distichia. Los componentes más abundantes en las fecas fueron: Lilaeopsis (29.68 %), Distichia (29.10 %), Werneria (13.7 %) y fibra vegetal (18.67 %). La mayor parte del peso de las fecas, corresponde a Distichia (26.82 %), Lilaeopsis (26.77 %), Werneria (19.73 %) y fibra vegetal (18.38 %), respectivamente. Los componentes más frecuentes en las fecas fueron: Distichia, Lilaeopsis, Alchemilla, Perezia, Werneria, Plantago, Especie 1, Especie 4 y fibra vegetal. Los mayores valores de Índice de Valor de Importancia, correspondieron a: Lilaeopsis (79.03), Distichia (70.96), fibra vegetal (64.00) y Werneria (57.76). El Índice de Shannon-Wiener (H’= 1.71), y el Índice de Simpson (D= 0.77), confirman la dominancia de ciertas especies presentes en la dieta. El Índice de Levins (B’= 0.2) sugiere una estrecha amplitud de nicho, e indica que el Ganso Andino posee un hábito alimenticio especialista en los bofedales del área de estudio.
- Published
- 2020
9. Conservation biology of three species of South American sheldgeese (Chloephaga spp.)
- Author
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Cossa, Natalia Andrea, Reboreda, Juan Carlos, and Fasola, Laura
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CONSERVATION ,Cauquén ,ESPECIES INVASORAS ,LIVESTOCK ,CAUQUEN ,INVASIVE SPECIES ,CHLOEPHAGA ,CONSERVACION ,Ciencias Biológicas ,Conservación ,GANADERIA ,SHELDGEESE ,CIENCIAS NATURALES Y EXACTAS ,Conservación de la Biodiversidad - Abstract
Los cauquenes son aves endémicas de América del Sur. Tres de ellos, el Cauquén Común (Chloephaga picta), el Cauquén Real (C. poliocephala) y el Cauquén Colorado (C. rubidiceps) se encuentran amenazados en Argentina. En la década de 1930, fueron declarados plaga y se promovió la destrucción masiva de sus nidos, el ahuyentamiento utilizando aviones, el envenenamiento, la caza de control y la caza deportiva. Estas acciones resultaron en una disminución drástica de sus poblaciones. Actualmente, en las áreas de invernada, los cauquenes son perseguidos por algunos agricultores y la caza deportiva continúa practicándose en forma ilegal. Por otra parte, sus áreas de cría han sido modificadas debido al sobrepastoreo de ovejas y vacas, y a la introducción de predadores exóticos en la isla de Tierra del Fuego, factores que probablemente han reducido el éxito reproductivo de estas especies. El objetivo de esta tesis fue estudiar la ecología de estas tres especies en el norte de Tierra del Fuego; y sur y noroeste de Santa Cruz, para generar recomendaciones de manejo que favorezcan los eventos reproductivos. Se monitorearon nidos de Cauquén Común con cámaras trampa para determinar el éxito reproductivo, estudiar los ritmos de incubación e identificar las principales amenazas durante la incubación. Se realizaron conteos poblacionales para caracterizar la dinámica estacional de uso de los ambientes a escala de grupo y de paisaje. A su vez, se realizaron observaciones comportamentales de grupos de cauquenes para caracterizar las interacciones con los herbívoros. Por último, se utilizaron nidos artificiales y se realizaron transectas en búsqueda de signos de carnívoros para evaluar que características del entorno del nido disminuyen la capacidad de detección del mismo y estudiar con que intensidad utilizan los carnívoros los distintos ambientes donde se reproducen los cauquenes. Se encontró que el Zorro Gris (Lycalopex griseus) fue el principal depredador de nidos en la estepa fueguina. Este predador invasor se registró en toda la estepa en altas densidades. En la estepa santacruceña, tanto el Zorro Gris como el Zorro Colorado (Lycalopex culpeaus), ambos nativos en el área, fueron responsables de la predación del 30% de nidos de Cauquén Común. Además, se encontró que el ganado generó interrupciones durante la incubación y fue responsable de la pérdida de nidos debido al pisoteo. El Cauquén Colorado, que históricamente era una de las especies más numerosas del área, fue observado solo en 15 sitios, se contaron como máximo 54 individuos, y se registró un solo evento reproductivo. En la estepa magallánica, los eventos reproductivos exitosos de Cauquén Común registrados fueron muy escasos, siendo mayores en Santa Cruz. El hábitat que albergó los grupos más numerosos fueron las vegas. Los resultados indican que deben aplicarse una serie de medidas de manejo (probablemente de manera simultánea) para favorecer el reclutamiento de pichones y de esta manera evitar la extinción de estas especies, particularmente para el Cauquén Colorado, el cual se encuentra en un delicado estado de conservación. Se recomienda el control del Zorro Gris en Tierra del Fuego, donde es invasor, y la protección de nidos o la aplicación de métodos aversivos donde es nativo. A la vez, se recomienda proteger mediante clausuras que exluyan al ganado las principales áreas de nidificación de estas especies para evitar disturbios y pérdidas debido al pisoteo. Sheldgeese are endemic birds of South America. Three of them, the Upland Goose (Chloephaga picta), the Ashy-headed Goose (C. poliocephala), and the Ruddyheaded Goose (C. rubidiceps) are endangered in Argentina. In 1930s, they were declared agricultural pest and it was promoted the massive destruction of their nests, the use of aircrafts to scare them away from crops, poisoning, and hunting. These actions resulted in a drastic decrease of their populations. Currently, in the wintering areas, sheldgeese are still persecuted by some farmers and sport hunting continues illegally. On the other hand, their breeding areas have been modified due to overgrazing of sheep and cows, and the introduction of invasive predators on the island of Tierra del Fuego, factors that have probably reduced sheldgeese reproductive success. The aim of this thesis was to study the ecology of these three species in the north of Tierra del Fuego; and south and northwest of Santa Cruz, to generate management recommendations that favor reproductive events. Upland Goose nests were monitored with camera traps to determine reproductive success, study the incubation rhythms and identify the main threats during incubation. Population counts were made to characterize the seasonal dynamics of habitat use at group and landscape scales. Also, behavioral observations of sheldgeese flocks were made to characterize the interactions with herbivores. Finally, artificial nests and carnivores sign transects were used to evaluate which characteristics of nest concealment decrease nest detection and to study carnivores habitat use where sheldgeese reproduce. The Grey Fox (Lycalopex griseus) was the main nest predator in the fueguian steppe. This invasive predator was recorded throughout the steppe at high densities. In Santa Cruz steppe, both the Grey and Culpeo (Lycalopex culpeaus) foxes, both natives in the area, were responsible for the predation of the 30% of Upland Goose nests. In addition, livestock often disturbed the incubation female, generated interruptions during the incubation, and was responsible for nest losses due to trampling. The Ruddy-headed Goose, which historically was one of the most common species in the area, was sighted only in 15 sites, a maximum of 54 individuals were counted, and a single reproductive event was recorded. In the Magellanic steppe, Upland Goose successful reproductive events were very scarce, being higher in Santa Cruz. Marshes was the type of habitat that housed the larger flocks. These results indicate that several management actions should be applied (probably simultaneously) to favor the recruitment of goslings and thus prevent the extinction of these species, particularly for the Ruddy-headed Goose, which is in a delicate state of conservation. In Tierra del Fuego, where the Grey Fox is invasive, its control is recommended. Where it is native, the protection of nests or the application of aversive methods should be applied. At the same time, it is recommended to protect, through enclosures that exclude livestock, the main sheldgeese nesting areas to avoid disturbances and losses due to trampling. Fil: Cossa, Natalia Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Ecología, Genética y Evolución de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Ecología, Genética y Evolución de Buenos Aires; Argentina
- Published
- 2019
10. Molecular phylogeny of the South American sheldgeese with implications for conservation of Falkland Islands (Malvinas) and continental populations of the Ruddy-headed GooseChloephaga rubidicepsand Upland GooseC. picta
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Olivia Blank, Robert E. Wilson, Ricardo Matus, Cecilia Kopuchian, Adrián S. Di Giacomo, Mariana Bulgarella, and Kevin G. McCracken
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education.field_of_study ,Ecology ,biology ,CONSERVATION ,Population ,Bioquímica y Biología Molecular ,MALVINAS ISLANDS ,biology.organism_classification ,CHLOEPHAGA ,Ciencias Biológicas ,Genetic divergence ,PHYLOGENETICS ,Critically endangered ,Geography ,Upland goose ,Waterfowl ,IUCN Red List ,Animal Science and Zoology ,Mainland ,education ,Chloephaga rubidiceps ,CIENCIAS NATURALES Y EXACTAS ,Nature and Landscape Conservation - Abstract
Sheldgeese of the genus Chloephaga are waterfowl (Anatidae) endemic to mainland South America and the Falkland Islands (Malvinas). Continental populations of three species C. picta, C. poliocephala, and C. rubidiceps breed in Patagonia and Tierra del Fuego and migrate northwards to winter in central Argentina and Chile. These continental populations have declined by > 50% in the past 30 years due to direct hunting to control crop damage and by the introduction of the grey fox Dusicyon griseus to their breeding grounds in Tierra del Fuego. The continental population of C. rubidiceps is critically endangered, estimated to be < 1,000 individuals. While no historic population size estimates exist for C. rubidiceps in its wintering grounds, the breeding population in Tierra del Fuego was estimated to number several thousand individuals in the 1950s. In contrast, the C. rubidiceps population in the Falkland Islands (Malvinas) is non-migratory and stable with > 42,000 individuals, as is the Falkland Islands (Malvinas) population of C. picta leucoptera with > 138,000 individuals. Here we use sequence data from the mitochondrial DNA control region to quantify genetic divergence between insular and continental populations of these two species of sheldgeese. Chloephaga rubidiceps and C. picta showed significant intraspecific differentiation of 1.0% and 0.6%, respectively. In both cases, mainland and insular populations were reciprocally monophyletic and did not share mtDNA haplotypes. These results suggest that the insular and continental populations of C. rubidiceps and C. picta are genetically distinct and that female-mediated gene flow is restricted. We recommend a reevaluation of the threat category status of the continental C. rubidiceps population, under IUCN guidelines. It is necessary to implement urgent actions for the conservation of this critically endangered population. Fil: Bulgarella, Mariana. Massey University; Nueva Zelanda Fil: Kopuchian, Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina Fil: Di Giacomo, Adrian Santiago. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Ecología, Genética y Evolución de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Ecología, Genética y Evolución de Buenos Aires; Argentina Fil: Matus, Ricardo. Centro de Rehabilitación Leñadura; Chile Fil: Blank, Viviana Claudia. Centro de Rehabilitación Leñadura; Chile Fil: Wilson, Robert E.. University of Alaska Fairbanks; Estados Unidos Fil: McCracken, Kevin G.. University of Alaska Fairbanks; Estados Unidos
- Published
- 2013
11. Demographic history inferred from genome-wide data reveals two lineages of sheldgeese endemic to a glacial refugium in the southern Atlantic
- Author
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Adrián S. Di Giacomo, Ricardo Matus, Mariana Bulgarella, Cecilia Kopuchian, Olivia Blank, Juan Mazar Barnett, Leonardo Campagna, Robert E. Wilson, Pablo Petracci, and Kevin G. McCracken
- Subjects
0106 biological sciences ,0301 basic medicine ,Conservation genetics ,Pleistocene ,Demographic history ,Population ,Biology ,010603 evolutionary biology ,01 natural sciences ,Coalescent theory ,CHLOEPHAGA ,Ciencias Biológicas ,03 medical and health sciences ,ISLAND ENDEMISM ,PLEISTOCENE REFUGIUM ,Glacial period ,education ,Chloephaga rubidiceps ,Ecology, Evolution, Behavior and Systematics ,education.field_of_study ,geography ,DEMOGRAPHIC MODELLING ,geography.geographical_feature_category ,Ecology ,CONSERVATION GENETICS ,TAXONOMY ,Bioquímica y Biología Molecular ,biology.organism_classification ,PATAGONIA ,030104 developmental biology ,ENDANGERED SPECIES ,Archipelago ,MALVINAS/FALKLAND ISLANDS ,geographic locations ,CIENCIAS NATURALES Y EXACTAS - Abstract
Aim The Malvinas/Falkland Islands (MFI) constitute the largest archipelago inthe southern Atlantic, and harbour endemic lineages that presumably evolvedafter sea-level rise, associated with glacial periods, isolated ancestral popula-tions. We investigate the role of the MFI in isolating populations from conti-nental counterparts of two highly vagile species: the sheldgeese Chloephagapicta and Chloephaga rubidiceps.Location Patagonia and the Malvinas/Falkland Islands.Methods We sampled C. picta and C. rubidiceps on the continent and MFI.Using a reduced-representation genomic approach, we quantified the geneticdifferentiation between insular and continental populations of both species,and used coalescent-based analyses to model their demography.Results The MFI harbour independently evolving lineages of C. picta andC. rubidiceps, which diverged from their continental counterparts during theMiddle-Late Pleistocene and have since experienced negligible gene flow.Main conclusions The c. 450 km that separate the archipelago from thecontinent are sufficient to isolate populations of these putatively highly vagilespecies. Ancestral lineages may have reached the MFI refugium during glacialcycles. Without conservation measures, the drastic decline of the morphologi-cally, behaviourally and ecologically distinct continental population ofC. rubidiceps,to< 1000 individuals, may lead to the extinction of an indepen-dently evolving taxon. Fil: Kopuchian, Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentina Fil: Campagna, Leonardo. Cornell University; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Di Giacomo, Adrian Santiago. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Centro de Ecología Aplicada del Litoral. Universidad Nacional del Nordeste. Centro de Ecología Aplicada del Litoral; Argentina Fil: Wilson, Robert E.. University Of Alaska; Estados Unidos Fil: Bulgarella, Mariana. University of Minnesota; Estados Unidos Fil: Petracci, Pablo. Universidad Nacional del Sur. Departamento de Biología, Bioquímica y Farmacia. Grupo de Estudios en Conservación y Manejo; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Mazar Barnett, Juan. Asociación de Ornitología del Plata; Argentina Fil: Matus, Ricardo. Centro de Rehabilitación de aves Leñadura; Chile Fil: Blank, Olivia. Centro de Rehabilitación de aves Leñadura; Chile Fil: McCracken, Kevin G.. University Of Alaska; Estados Unidos
- Published
- 2016
12. El estado actual de Chloephaga rubidiceps
- Author
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M. Rumboll
- Subjects
avutarda ,Chloephaga ,gansos sudamaricanos ,protección y conservación de la fauna ,VII Congreso Latinoamericano de Zoología ,Ecology ,QH540-549.5 ,Zoology ,QL1-991 - Abstract
Tres especies del género Chloephaga (gansos sudamaricanos mal llamados Avutardas) fueron declaradas plagas en 1964. Irónicamente una de ellas, Chloephaga rubidiceps, la avutarda o cauquén de cabeza colorada estaba ya en un notable receso númerico que ha continuado hasta este momento.
- Published
- 1979
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