Aythya valisineria: BirdLife International

SUMMARYExperimental infections of mallards (Anas platyrhynchos L.) with Typhlocoelum cucumerinum sisowi (Skrjabin, 1913) and of canvasbacks (Aythya valisineria (Wilson)) with Typhlocoelum cucumerinum cucumerinum (Rudolphi, 1809) revealed significant differences in various parameters of the life-cycle in the definitive host. Both T. c. sisowi and T. c. cucumerinum migrate to the trachea via the abdominal cavity, air sacs and lungs, although T. c. cucumerinum migrate more quickly and more synchronously than T. c. sisowi. Typhlocoelum c. sisowi has a shorter expected life-span than T. c. cucumerinum but grows and reaches maturity more quickly than T. c. cucumerinum. Evidence suggests that T. c. cucumerinum has a higher fecundity than T. c. sisowi. These differences in the patterns of migration, growth and development are related not only to differences between the two host species but also to differences intrinsic to the parasites, and serve to provide biological support for considering them as separate sub-species.

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Long-Term Productivity of Canvasbacks (Aythya valisineria) in a Snowpack-Driven Desert Marsh

The Auk ◽

10.2307/4090145 ◽

2003 ◽

Vol 120 (1) ◽

pp. 107-119 ◽

Cited By ~ 1

Author(s):

Kammie L. Kruse ◽

James R. Lovvorn ◽

John Y. Takekawa ◽

Jeffrey Mackay

Keyword(s):

Aythya Valisineria

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Circadian rhythms in diving behavior and ventilatory response to asphyxia in canvasback ducks

AJP Regulatory Integrative and Comparative Physiology ◽

10.1152/ajpregu.1998.274.3.r686 ◽

1998 ◽

Vol 274 (3) ◽

pp. R686-R693 ◽

Cited By ~ 6

Author(s):

Melanie Woodin ◽

Richard Stephenson

Keyword(s):

Control Systems ◽

Ventilatory Response ◽

Behavioral Control ◽

Feeding Activity ◽

Diving Behavior ◽

Diving Ducks ◽

Timing System ◽

Aythya Valisineria ◽

Circadian Timing System ◽

Respiratory Responses

Underwater feeding behavior was measured in 10 captive canvasback ducks ( Aythya valisineria) for 12 days under a 12:12-h light-dark photoperiod. Feeding activity exhibited a daily rhythm, with 76% of dives occurring at night. In separate experiments on six of these ducks, a circadian rhythm was observed in the duration of voluntary dives. Dives at night (14.7 ± 0.7 s) were significantly longer than those during the day (10.7 ± 0.7 s). These day-night differences in diving behavior were accompanied by day-night differences in respiratory responses to progressive asphyxia. In the same six ducks, ventilation increased exponentially as a function of inspired CO2 concentration during rebreathing in a closed-circuit barometric plethysmograph. The exponential rate constant for inspired ventilation was significantly smaller at night (0.23 ± 0.02) than during the day (0.26 ± 0.01). We suggest that intermittent apneic exercise is facilitated by reduced respiratory chemosensitivity and that the respiratory and behavioral control systems are synchronized by the circadian timing system in diving ducks.

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Spatial structure of a diving duck (Aythya, Oxyura) guild: how does habitat structure and competition influence diving duck habitat use within northern prairie wetlands?

Canadian Journal of Zoology ◽

10.1139/z06-121 ◽

2006 ◽

Vol 84 (9) ◽

pp. 1358-1367 ◽

Cited By ~ 6

Author(s):

S.M. Torrence ◽

M.G. Butler

Keyword(s):

Sympatric Species ◽

Benthic Invertebrate ◽

Organic Content ◽

Current Evidence ◽

Similar Species ◽

Prairie Wetlands ◽

Diving Duck ◽

Diving Ducks ◽

Aythya Valisineria ◽

Coexistence Mechanisms

What circumstances allow the coexistence of similar species is a common but complex question in community ecology. It is often assumed that sympatric species within the same guild must employ some mechanism of niche diversification to coexist. Diving duck (Anatidae: Aythya Boie, 1822 and Oxyura Bonaparte, 1828) competition is poorly understood and current evidence of coexistence mechanisms is contradictory. In the spring and summer of 2001 and 2002, we tested whether diving ducks foraging within prairie potholes segregate by depth to avoid competition. We sought to explain any segregation by sampling sediment particle size, compactness, and organic content; submergent vegetation; and benthic invertebrate densities in the foraging locations of each species. Our study was conducted at the wetland scale in southwestern Manitoba, Canada. We found that Redheads ( Aythya americana (Eyton, 1838)), Ruddy Ducks ( Oxyura jamaicensis (J.F. Gmelin, 1789)), Canvasbacks ( Aythya valisineria (Wilson, 1814)), and Ring-necked Ducks ( Aythya collaris (Donovan, 1809)) foraged most often at shallow depths (50–100 cm), while Lesser Scaups ( Aythya affinis (Eyton, 1838)) foraged at shallow to intermediate depths (50–150 cm). Thus, most divers did not segregate by depth. These results conflict with an earlier study that reported diving ducks segregated by depth to avoid competition. Diving ducks likely forage where prey abundance is greatest relative to the cost of diving to obtain that prey.

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Helmintos intestinales de algunas aves acuáticas en el estado de Hidalgo: estudio de caso, Lago de Tecocomulco

Revista Biológico Agropecuaria Tuxpan ◽

10.47808/revistabioagro.v2i1.297 ◽

2014 ◽

Vol 2 (1) ◽

pp. 251-255

Author(s):

Emmanuel Alemán Canales ◽

Scott Monks ◽

Griselda Pulido Flores

Keyword(s):

Anas Discors ◽

Fulica Americana ◽

Echinostoma Revolutum ◽

Aythya Valisineria ◽

Estudio De Caso

Como parte de un estudio de la calidad ambiental de Lago de Tecocomulco, Hidalgo, México, fueron colectados los helmintos intestinales de 70 aves de cinco especies: Anas americana, Anas discors, Aythya valisineria, Gallinula chloropus y Fulica americana. Los intestinos de las aves fueron donados por los cazadores locales, transportadas al laboratorio y los helmintos fueron colectados, fijados en AFA y conservados en alcohol etílico (70%) hasta su tinción y montaje. Ocho especies de dos taxa de helmintos fueron encontrados: Digenea-Echinostoma revolutum, Zygocotyle lunata, Echinoparyphium recurvatum, Notocotylus pacifer, Apatemon gracilis, Pseudoapatemon sp.; y Acanthocephala-Polymorphus trochus y Pseudocorynosoma constrictum. Echinostomum revolutum tuvo la mayor prevalencia, abundancia e intensidad promedio en las 36 aves de la Familia Anatidae; una prevalencia de 40% fue encontrada en cada especie de ave de esta familia. Sin embargo, en F. americana (Rallidae), P. trochus tuvo la mayor prevalencia (58.6%), una abundancia de 2.0 y N. pacifer tuvo mayor intensidad promedio (4.3). Echinostomum revolutum y Ps. Constrictum se registran por segunda ocasión en Hidalgo; Z. lunata, N. pacifer, A. gracilis y P. trochus son nuevos registros para las aves en Hidalgo y Pseudoapatemon sp. es un nuevo registro para México. Es importante monitorear los parásitos de las aves acuáticas migratorias en Lago de Tecocomulco ya que sirven como indicadores de la calidad ambiental del lago.

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