Shot Ingestion by Wintering Female Northern Pintails (Anas acuta) in the Texas Coastal Plain, 2012–14

2016 ◽  
Vol 52 (1) ◽  
pp. 118-121 ◽  
Author(s):  
Nathaniel R. Huck ◽  
Bart M. Ballard ◽  
Alan M. Fedynich ◽  
Kevin J. Kraai ◽  
Mauro E. Castro
Keyword(s):  
Coastal Plain ◽  
Anas Acuta ◽  
Northern Pintails

scholarly journals ESTIMATION OF CARCASS FAT AND PROTEIN IN NORTHERN PINTAILS (ANAS ACUTA) DURING SPRING MIGRATION

2003 ◽  
Vol 39 (3) ◽  
pp. 620-626 ◽  
Author(s):  
Pascale Dombrowski ◽  
Jean-Claude Bourgeois ◽  
Richard Couture ◽  
Christian Linard
Keyword(s):  
Spring Migration ◽  
Anas Acuta ◽  
Northern Pintails

scholarly journals Do Female Northern Pintails, Anas acuta, Initiate Rapid Follicular Growth During Spring Migration?

2003 ◽  
Vol 117 (4) ◽  
pp. 605
Author(s):  
Pascale Dombrowski ◽  
Jean-Claude Bourgeois ◽  
Richard Couture ◽  
Christian Linard
Keyword(s):  
Bone Mass ◽  
Follicular Development ◽  
Formation Processes ◽  
Follicular Growth ◽  
Total Blood ◽  
Anas Acuta ◽  
Blood Calcium ◽  
Egg Formation ◽  
Northern Pintails ◽  
St Lawrence River

We describe the reproductive status of female Northern Pintails (Anas acuta) staging on a flooded plain along the St. Lawrence River (Quebec, Canada) during the spring of 1997. Nine of the 27 female pintails we collected had ovarian follicles showing Rapid Follicular Growth (RFG). In RFG females, total blood calcium and ash mass increased with follicular development. They had greater muscle and bone mass, and higher blood calcium levels, compared to pre-RFG birds. However, carcass fat mass and sex hormone levels (estradiol and progesterone) did not differ between the two groups. Our results indicate that at least some Northern Pintails initiate egg formation processes prior to arrival at nesting areas, which is consistent with early nesting. The nutrients and energy required for this early egg formation must come from reserves stored during winter, foods consumed in staging areas, or both.

Body reserves of neonate northern pintails (Anas acuta)

1988 ◽  
Vol 66 (4) ◽  
pp. 811-816 ◽  
Author(s):  
David C. Duncan
Keyword(s):  
Body Composition ◽  
Total Lipid ◽  
Lipid Content ◽  
The Body ◽  
Anas Acuta ◽  
High Lipid Content ◽  
Fat Deposits ◽  
High Lipid ◽  
Northern Pintails ◽  
Starvation Conditions

Neonate northern pintails (Anas acuta) had a high lipid content primarily attributable to the fat deposits in their carcasses. Their yolk sacs contained 24% of the total lipid at hatching. In the absence of food, newly hatched northern pintails survived by catabolizing their carcass fats. The yolk sac was not an important source of endogenous nutriment under starvation conditions but appeared to be important to the growth of ducklings, contributing materials for the synthesis of nonfat tissue. The function of yolk sacs is reviewed and the body composition of neonate northern pintails is compared with that of other species in relation to the developmental maturity of the young.

Variation in spring migration routes and breeding distribution of northern pintails Anas acuta that winter in Japan

2011 ◽  
Vol 42 (4) ◽  
pp. 289-300 ◽  
Author(s):  
Jerry W. Hupp ◽  
Noriyuki Yamaguchi ◽  
Paul L. Flint ◽  
John M. Pearce ◽  
Ken-ichi Tokita ◽  
...  
Keyword(s):  
Spring Migration ◽  
Migration Routes ◽  
Anas Acuta ◽  
Breeding Distribution ◽  
Northern Pintails

scholarly journals Does Increasing Daylength Control Seasonal Changes in Clutch Sizes of Northern Pintails (Anas Acuta)?

The Auk ◽  
2002 ◽  
Vol 119 (2) ◽  
pp. 498-506 ◽  
Author(s):  
Gary L. Krapu ◽  
Glen A. Sargeant ◽  
Alison E. H. Perkins
Keyword(s):  
North Dakota ◽  
Survival Rates ◽  
Day Length ◽  
Population Declines ◽  
Anas Acuta ◽  
Breeding Grounds ◽  
Northern Pintails ◽  
Rate Of Decline ◽  
Seasonal Decline ◽  
Nesting Season

AbstractWe evaluated spatiotemporal variation in clutch sizes of Northern Pintails (pintails; Anas acuta) nesting in California (1985 to 1996), North Dakota (1982 to 1985), Saskatchewan (1982 to 1985) and Alaska (1991 to 1993) to determine whether seasonal declines in clutch size varied in ways that were consistent with a controlling influence of increasing day length. Pintails began nesting in mid-March in California, mid-April in North Dakota and Saskatchewan, and mid-May in Alaska. Observed durations of nesting were 70 ± 2.6 days (SE) in California, 60 ± 6.3 days in North Dakota, 66 ± 1.3 days in Saskatchewan, and 42 ± 0.7 days in Alaska. Annual differences were the principal source of variation in mean clutch sizes (σ̂Y2 = 0.15, SE = 0.049), which varied little among study locations (σ̂A2 = 0.002, SE = 0.013). Predicted rates of seasonal decline in clutch sizes increased with latitude early in the nesting season, but declined as the nesting season progressed, except in California. Rates of decline in clutch sizes thus were not directly related to rates of increase in day length. Predicted declines in numbers of eggs per clutch over the nesting season were similar for all four locations (range, 3.05–3.12) despite wide variation in durations of nesting. Evidence suggests that reduced nutrient availability during nesting contributes to a higher rate of decline in clutch sizes in Alaska than in temperate regions. Pintails that nest early lay large initial clutches, but thereafter clutch sizes decline rapidly and breeding terminates early. This reproductive strategy is adaptive because young that hatch earliest exhibit the highest survival rates; however, the conversion of grassland to cropland on the primary prairie breeding grounds has reduced hatching rates of clutches laid early in the nesting season. Under these conditions, the limited capacity to renest in late spring on their prairie breeding grounds probably has contributed to Pintail population declines.

Contrast Radiography With Positive-Pressure Insufflation in Northern Pintails (Anas acuta)

2001 ◽  
Vol 15 (3) ◽  
pp. 178-186 ◽  
Author(s):  
Johanna Sherrill ◽  
Lisa H. Ware ◽  
Warren E. Lynch ◽  
Richard J. Montali ◽  
Mitchell Bush
Keyword(s):  
Positive Pressure ◽  
Anas Acuta ◽  
Contrast Radiography ◽  
Northern Pintails

Surveillance of Avian Influenza Viruses in Northern Pintails (Anas acuta) in Tohoku District, Japan

2008 ◽  
Vol 52 (1) ◽  
pp. 49-53 ◽  
Author(s):  
Alam Jahangir ◽  
Yuko Watanabe ◽  
Omoto Chinen ◽  
Shoki Yamazaki ◽  
Kouji Sakai ◽  
...  
Keyword(s):  
Avian Influenza ◽  
Influenza Viruses ◽  
Avian Influenza Viruses ◽  
Anas Acuta ◽  
Northern Pintails

scholarly journals Influence of Environmental Stress and Anthropogenic Disturbance on the Energy Expenditure of Wintering Northern Pintails (Anas acuta)

Waterbirds ◽  
2019 ◽  
Vol 42 (3) ◽  
pp. 294
Author(s):  
Dustin P. Taylor ◽  
Daniel A. Dvorett ◽  
John N. Vradenburg ◽  
Loren M. Smith
Keyword(s):  
Energy Expenditure ◽  
Environmental Stress ◽  
Anthropogenic Disturbance ◽  
Anas Acuta ◽  
Northern Pintails
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