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Готові списки джерел за темами / Northern shoveler

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Статті в журналах

Добірка наукової літератури з теми "Northern shoveler"

Автор: Grafiati

Опубліковано: 25 жовтня 2023

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Статті в журналах з теми "Northern shoveler"

1

Wells-Berlin, Alicia M., Harold H. Prince, and Todd W. Arnold. "Incubation Length of Dabbling Ducks." Condor 107, no. 4 (2005): 926–29. http://dx.doi.org/10.1093/condor/107.4.926.

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AbstractWe collected unincubated eggs from wild Mallard (Anas platyrhynchos), Gadwall (A. strepera), Blue-winged Teal (A. discors), and Northern Shoveler (A. clypeata) nests and artificially incubated them at 37.5°C. Average incubation lengths of Mallard, Gadwall, and Northern Shoveler eggs did not differ from their wild-nesting counterparts, but artificially incubated Blue-winged Teal eggs required an additional 1.7 days to hatch, suggesting that wild-nesting teal incubated more effectively. A small sample of Mallard, Gadwall, and Northern Shoveler eggs artificially incubated at 38.3°C hatche

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2

Titman, Rodger, Elise Titman, and Shawn Craik. "Timing of pair formation and male acquisition of alternate plumage by three wintering dabbling ducks." Canadian Field-Naturalist 135, no. 1 (2021): 39–46. http://dx.doi.org/10.22621/cfn.v135i1.2547.

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Pair formation in ducks is thought to be influenced by the acquisition of breeding plumage, the occurrence of courtship display, or both. We examined the frequency of pair formation in Mallard (Anas platyrhynchos), Green-winged Teal (Anas crecca carolinensis), and Northern Shoveler (Spatula clypeata) in the central valley of California in relation to the frequencies of male attainment of breeding plumage and courtship display. Predictions related to two hypotheses are: (1) the timing of pair formation is directly related to the attainment of breeding (definitive alternate) plumage by males, an

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3

Slimane, Ayeb, Elafri Ali, and Salah Telailia. "Northern Shoveler Spatula clypeata: a possible first breeding record for Algeria." Biodiversity Observations 13 (February 24, 2023): 142–45. http://dx.doi.org/10.15641/bo.1210.

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Анотація:

Breeding events of a waterbird species outside of their normal breeding grounds could be important to address how population changes on wintering areas are impacted by changes elsewhere in the birds’ annual cycle. In this note we confirm the first breeding record of Northern Shoveler Spatula clypeata in Algeria. The breeding site was a saline lake, Sebkhet El-mahmel, located 180 km from the Mediterranean Sea and subject to a semi-arid climate. The area was visited on 16 June 2019 and the species was confirmed as a pair of Northern Shoveler accompanied by eight juveniles. The Northern Shoveler

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4

DuBowy, Paul J. "Feeding ecology and behavior of postbreeding male Blue-winged Teal and Northern Shovelers." Canadian Journal of Zoology 63, no. 6 (1985): 1292–97. http://dx.doi.org/10.1139/z85-194.

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This study examined foraging strategies in male Northern Shovelers (Anas clypeata) and Blue-winged Teal (Anas discors). Differences in time–activity budgets and esophageal contents between the two species indicated major differences in the degree of foraging specialization. Preflightless male Northern Shovelers spent 84.2% of time foraging, with dabbling in the water column as the principal foraging mode (83.4%), while postflightless male shovelers spent 81.6% of time foraging (78.7% dabbling). Preflightless male Blue-winged Teal spent 68.6% of time foraging, with dabbling in mud (32.5%) and p

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5

Krapu, Gary L., Ronald E. Reynolds, Glen A. Sargeant, and Randy W. Renner. "Patterns of Variation in Clutch Sizes in a Guild of Temperate-Nesting Dabbling Ducks." Auk 121, no. 3 (2004): 695–706. http://dx.doi.org/10.1093/auk/121.3.695.

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Abstract We investigated patterns and causes of variation in clutch sizes in a guild of five species of temperate-nesting dabbling ducks (Mallard [Anas platyrhynchos], Northern Pintail [“pintail,” A. acuta], Gadwall [A. strepera], Blue-winged Teal [“teal,” A. discors], and Northern Shoveler [“shoveler,” A. clypeata]) during 1993-1995 in the Prairie Pothole Region of midcontinental North America. Clutch sizes (mean ± SE) were largest for teal (10.80 ± 0.03), followed in descending order by those of shoveler (10.31 ± 0.05), Gadwall (9.92 ± 0.04), Mallard (8.91 ± 0.04), and pintail (7.66 ± 0.06).

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6

Krapu, Gary L. "Temporal Flexibility of Reproduction in Temperate-Breeding Dabbling Ducks." Auk 117, no. 3 (2000): 640–50. http://dx.doi.org/10.1093/auk/117.3.640.

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Анотація:

AbstractI compared nesting intervals during three consecutive years in five species of temperate-nesting dabbling ducks (Mallard [Anas platyrhynchos], Northern Pintail [Anas acuta], Northern Shoveler [Anas clypeata], Blue-winged Teal [Anas discors], Gadwall [Anas strepera]) and assessed whether differences existed in timing of refractoriness. Most nesting by females of all five species ended by the summer solstice. Nesting ended earliest for Northern Shovelers and Northern Pintails and latest for Gadwalls. Some Mallards, Blue-winged Teal, and Gadwalls continued to nest into mid- and late summe

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7

El Rahman, Mokhless Ahmed Mohamed Abd, Ahmed Hamed Khalifa, and Ahmed Shabaan Badri Ashour. "Carcass Characteristics, Physicochemical Properties and Nutritional Composition of Meat from two Wild Birds: Northern Pintail (Anas acuta) and Northern Shoveler (Spatula clypeata)." International Journal of Current Microbiology and Applied Sciences 11, no. 8 (2022): 130–46. http://dx.doi.org/10.20546/ijcmas.2022.1108.013.

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Анотація:

The objective of this study was to evaluate the characteristics of the carcass, physicochemical properties as well as nutritional composition in breast and leg meat (with skin) of two different genotypes of wild birds namely: pintail (Anas acuta) and shoveler (Spatula clypeata) with regard to sex effect. The study involved forty-eight birds, 24 pintail and 24 shovelers (1:1 sex ratio) harvested during the hunting season (in September and November 2020) in lake Nasser from the Gerf-Hussein region, south Aswan Government. After the slaughter and dissection. PH, WHC and color coordinates of the b

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8

Loos, Elizabeth R., and Frank C. Rohwer. "Laying-Stage Nest Attendance and Onset of Incubation in Prairie Nesting Ducks." Auk 121, no. 2 (2004): 587–99. http://dx.doi.org/10.1093/auk/121.2.587.

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Анотація:

Abstract We used microprocessor data loggers to document patterns of nest attendance during the laying stage and to quantify temperatures of dummy eggs during laying for Mallard (Anas platyrhynchos), Blue-winged Teal (A. discors), Northern Shoveler (A. clypeata), Northern Pintail (A. acuta), Gadwall (A. strepera), Green-winged Teal (A. crecca), American Wigeon (A. americana), and Lesser Scaup (Aythya affinis) nesting in southern Manitoba in 1994 and in northeastern North Dakota in 1995–1997 and 2000–2002. Females of all species increased the time they spent on the nest as laying progressed, bu

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9

MATUBARA, Takeshi. "Esophageal and Gizzard Contents of Northern Shoveler(Anas clypeata) in Lake Teganuma." Japanese Journal of Limnology (Rikusuigaku Zasshi) 53, no. 4 (1992): 373–77. http://dx.doi.org/10.3739/rikusui.53.373.

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10

Heitmeyer, Mickey E. "Influences of age, body condition, and structural size on mate selection by dabbling ducks." Canadian Journal of Zoology 73, no. 12 (1995): 2251–58. http://dx.doi.org/10.1139/z95-267.

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Анотація:

Both members of pairs of mallards (Anas platyrhynchos), northern pintails (Anas acuta), northern shovelers (Anas clypeata), and American wigeon (Anas americana) were collected early in the pairing periods in fall and during spring migration (several months after most birds were paired) to provide insights into whether (i) assortative mating occurs; (ii) body condition changes synchronously among pair members; and (iii) characteristics of selected individuals ultimately confer advantages in survival and recruitment. Both members in 19 of 21 mallard, 16 of 16 pintail, 14 of 14 shoveler, and 14 o

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