A Simple Field Candler for Waterfowl Eggs

Weller, Milton W.

doi:10.2307/3797414

Cited by 413 publications

(215 citation statements)

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“…As the study team progressed northwards along the coast in 2006, approximately 20-30 nests were candled (Weller 1956) in each of the archipelagos of Rigolet, Hopedale and Nain to assess stage of incubation (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

Suspected Long-Term Population Increases in Common Eiders, Somateria mollissima, on the Mid-Labrador Coast, 1980, 1994, and 2006

Chaulk

2009

Can Field Nat

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Aerial surveys for adult male Common Eiders, Somateria mollissima, were flown on the Labrador coast during June 2006. This information was then compared with aerial counts of adult male Common Eiders collected in 1980 and 1994. For each survey year, data were grouped and paired by coastal block and were analyzed for population trends. Overall, the observed counts of adult male Common Eiders increased by 244% between 1980 and 2006. Much of this increase seemed to occur in the southern region of the study area.

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Section: Methodsmentioning

confidence: 99%

Suspected Long-Term Population Increases in Common Eiders, Somateria mollissima, on the Mid-Labrador Coast, 1980, 1994, and 2006

Chaulk

2009

Can Field Nat

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“…A nest without feathers or eggs was not deemed active in the current nesting season unless the nest bowl was well developed and contained enough new nest material to cover an egg, as geese commonly make more than one scrape while selecting a suitable nest site but do not add grass to the bowl until an egg is laid (Mowbray et al 2002). We determined the age of the eggs in the nest either by candling the eggs (Weller 1956) or by floating them to determine air cell volume (Westerskov 1950;Walter and Rusch 1997). When floating eggs, we identified 10 different float stages (four more divisions than Walter and Rusch 1997); estimates of nest age likely were accurate within < 3 days (C. Ely, unpublished data on B. h. minima).…”

Section: Study Area and Methodsmentioning

confidence: 99%

Nesting Biology of Lesser Canada Geese, Branta canadensis parvipes, along the Tanana River, Alaska

2008

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Lesser Canada Geese (Branta canadensis parvipes) are widespread throughout interior regions of Alaska and Canada, yet there have been no published studies documenting basic aspects of their nesting biology. We conducted a study to determine reproductive parameters of Lesser Canada Geese nesting along the Tanana River near the city of Fairbanks, in interior Alaska. Fieldwork was conducted in May of 2003, and consisted of locating nests along the riparian corridor between Fairbanks and Northpole, Alaska. Nests were found on gravel islands and shore habitats along the Tanana River, and were most commonly observed among driftwood logs associated with patches of alder (Alnus spp.) and willow (Salix spp.). Peak of nest initiation was 3-8 May, with a range from 27 April to 20 May; renesting was likely. Clutches ranged in size from 2 to 7 eggs and averaged 4.6 eggs. There was a negative correlation between clutch size and date of nest initiation. Egg size (mean mass = 128 g) was similar to other medium-sized Canada Geese. A positive correlation between egg size and clutch size was likely related to female age. Nineteen of 28 nests (68%) were active when visited; nests located on islands with nesting Mew Gulls (Larus canus) were more likely to be active than nests located elsewhere. Evidence at nest sites implicated Bald Eagles (Haliaeetus leucocephalus) and Red Foxes (Vulpes vulpes) as nest predators.

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“…(Weller 1956) were used to estimate the initiation date and the expected hatch date. A "nest" was defined as any clutch found with one or more viable eggs.…”

mentioning

confidence: 99%