Population Energetics of Northern Pintails Wintering in the Sacramento Valley, California

Miller, Michael R.; Newton, Wesley E.

doi:10.2307/3802840

Cited by 55 publications

(57 citation statements)

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“…Eadie et al (2008) and Remsen et al (1991) reported that 15 species of waterfowl regularly used rice fields during the non-growing season in California and the Gulf Coast, USA, whereas at least nine species were commonly observed in MAV fields (Delnicki and Reinecke 1986;Reinecke et al 1992;Twedt and Nelms 1999;Huner et al 2002;Greer et al 2009). Additionally, authors have reported that waterfowl using rice fields in winter feed heavily on waste rice (Singleton 1951;Reinecke et al 1989;Miller and Newton 1999;Dabbert and Martin 2000;van Groenigen et al 2003;Manley et al 2004;Mugica et al 2006a;Greer et al 2009). …”

Section: Rice Seedsmentioning

confidence: 99%

Avian Foods, Foraging and Habitat Conservation in World Rice Fields

2010

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Section: Rice Seedsmentioning

confidence: 99%

Avian Foods, Foraging and Habitat Conservation in World Rice Fields

2010

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“…have mainly been documented for either wintering (Tamisier 1972;review in Paulus 1982;Miller 1985;Morton et al 1989) or breeding birds (e.g., Seymour 1974;Asplund 1981;Å ström 1992). Time use in staging spring-migrating dabbling ducks remains almost undocumented, even in very common and otherwise well-studied species (but see Arzel and Elmberg 2004).…”

Section: Introductionmentioning

confidence: 99%

A flyway perspective of foraging activity in Eurasian Green-winged Teal,Anas crecca crecca

2007

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Time-activity budgets in the family Anatidae are available for the wintering and breeding periods. We present the first flyway-level study of foraging time in a long-distance migrant, the Eurasian Green-winged Teal, Anas crecca crecca L., 1758 (''Teal''). Behavioral data from early and late spring staging, breeding, and molting sites were collected with standardized protocols to explore differences between the sexes, seasons, and diel patterns. Teal foraging activity was compared with that of the Mallard, Anas platyrhynchos L., 1758 and Northern Shoveler, Anas clypeata L., 1758, and the potential effects of duck density and predator-caused disturbance were explored. In early spring, foraging time was moderate (50.5%) and mostly nocturnal (45%). It increased dramatically in all three species at migration stopovers and during molt, mostly because of increased diurnal foraging, while nocturnal foraging remained fairly constant along the flyway. These patterns adhere to the ''income breeding'' strategy expected for this species. No differences between the sexes were recorded in either species studied. Teal foraging time was positively correlated with density of Teal and all ducks present, but negatively correlated with predator disturbance. Our study suggests that Teal, in addition to being income breeders, may also be considered as income migrants; they find the energy necessary to migrate at staging sites along the flyway.Résumé : Les budgets-temps des Anatidae sont disponibles pour les périodes d'hivernage et de reproduction. Nous pré-sentons la première étude, à l'échelle d'une voie de migration, du temps d'approvisionnement d'un migrateur de longue distance, la sarcelle d'hiver, Anas crecca crecca L., 1758. Les données comportementales de début et fin de migration printanière, reproduction et mue ont été obtenues, avec le même protocole, afin de tester les différences entre sexes, saisons et variations nycthémérales. L'approvisionnement des sarcelles est comparé à celui des canards colverts, Anas platyrhynchos L., 1758, et des canards souchets, Anas clypeata L., 1758; les effets de la densité de canards et du dérangement par les prédateurs sont également testés. Au début du printemps, le temps d'approvisionnement était court (50,5 %), et essentiellement nocturne (45 %). Il augmentait ensuite de façon spectaculaire pour les trois espèces sur les haltes migratoires et durant la mue (principalement à cause de l'approvisionnement diurne, l'approvisionnement nocturne étant constant). Ceci s'accorde avec la stratégie de « reproducteur sur revenu » attendue chez ces espèces. Aucune différence inter-sexe n'a été relevée chez les espèces étudiées. Le temps d'approvisionnement des sarcelles était corrélé positivement avec leur densité et celle de l'ensemble des canards présents et négativement avec le dérangement par les prédateurs. Les sarcelles seraient des reproducteurs mais également des migrateurs sur revenu, trouvant l'énergie nécessaire à leur migration en route.

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“…Third, we evaluated the effects of daylight and nighttime hours and hunting and nonhunting periods on habitat selection patterns by radio-marked pintails. We considered night locations as foraging habitats based on reports of pintails feeding primarily at night (Miller 1985, Euliss & Harris 1987, Palomares & Delibes 1992. The purpose of this objective was to evaluate evidence for the prevailing night foraging hypotheses: preference or supplementary.…”

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confidence: 99%

Hunting influences the diel patterns in habitat selection by northern pintails Anas acuta

et al. 2012

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Northern pintail Anas acuta (hereafter pintail) populations wintering within Suisun Marsh, a large estuarine managed wetland near San Francisco Bay, California, USA, have declined markedly over the last four decades. The reasons for this decline are unclear. Information on how hunting and other factors influence the selection of vegetation types and sanctuaries would be beneficial to manage pintail populations in Suisun Marsh. During 1991-1993, we radio-marked and relocated female pintails (individuals: N ¼ 203, relocations: N ¼ 7,688) within Suisun Marsh to investigate habitat selection during the non-breeding months (winter). We calculated selection ratios for different vegetation types and for sanctuaries, and examined differences in those ratios between hunting season (i.e. hunting and non-hunting), age (hatchyear and after-hatch-year), and time of day (daylight or night hours). We found that diel patterns in selection were influenced by hunting disturbance. For example, prior to the hunting season and during daylight hours, pintails selected areas dominated by brass buttons Cotula coronopifolia, a potentially important food source, usually outside of sanctuary boundaries. However, during the hunting season, pintails did not select brass buttons during daylight hours, but instead highly selected permanent pools, mostly within sanctuaries. Also, during the hunting season, pintails showed strong selection for brass buttons at night. Sanctuaries provided more area of permanent water pools than within hunting areas and appeared to function as important refugia during daylight hours of the hunting season. Wildlife managers should encourage large protected permanent pools adjacent to hunted wetlands to increase pintail numbers within wetland environments and responsibly benefit hunting opportunities while improving pintail conservation.

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Population Energetics of Northern Pintails Wintering in the Sacramento Valley, California

Cited by 55 publications

References 33 publications

Avian Foods, Foraging and Habitat Conservation in World Rice Fields

Avian Foods, Foraging and Habitat Conservation in World Rice Fields

A flyway perspective of foraging activity in Eurasian Green-winged Teal,Anas crecca crecca

Hunting influences the diel patterns in habitat selection by northern pintails Anas acuta

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