A study of Canada geese, Branta canadensis, nesting on islands in southeastern Alberta

1970 ◽  
Vol 48 (2) ◽  
pp. 235-240 ◽  
Author(s):  
Kees Vermeer
Keyword(s):  
Egg Laying ◽  
Water Levels ◽  
Branta Canadensis ◽  
Canada Goose ◽  
Canada Geese ◽  
Uniform Spacing ◽  
Incubation Periods

Canada goose clutches situated on islands in Dowling Lake and Lake Newell, Alberta, were checked from laying to hatching. Egg-laying intervals averaged 1.87 days and incubation periods 26.8 days. The distribution of nests showed a significant deviation from randomness in the direction of uniform spacing. Causes of extensive hatching failure at Dowling Lake were predation and desertion. Predation by coyotes was facilitated by low water levels. A preference for nesting on islands appears to be a mechanism to counteract mammalian predation.

scholarly journals A white feathered area on the forehead is more common in hybrids of Greylag Goose Anser anser and Greater Canada Goose Branta canadensis than in the parent species

Ornis Svecica ◽  
2011 ◽  
Vol 21 (1) ◽  
pp. 37-44
Author(s):  
C G Gustavsson
Keyword(s):  
Quantitative Comparison ◽  
Branta Canadensis ◽  
Canada Goose ◽  
Canada Geese ◽  
Parent Species ◽  
Anser Anser ◽  
White Area ◽  
Greylag Goose ◽  
Greylag Geese

This study evaluated prevalence and extent of white areas on heads of Greylag Goose × Greater Canada Goose hybrids. A white area which bordered the bill and then to various degrees extended over the forehead was found in 17 out of 20 hybrids. This was significantly more common in the hybrids than in the parent species. The white areas in the hybrids were also significantly larger than in those 82 out of 191 adult Greylag Geese which had some amount of white area. There were too few Greater Canada Geese with a white area outside the normal pale cheek patch to make a meaningful similar quantitative comparison also with them. No white area was seen in the three presumed 1st Calendar Year (CY) hybrids but when two of them were seen again in September of the 2nd CY there were some pale feathers that were interpreted as the beginning of white areas. The white areas in hybrids are therefore regarded to be adult features which like in several pure Anser species begin to develop during the 2nd CY.

scholarly journals Effects of liberalizing harvest regulations on Canada goose (Branta canadensis) demography in Nebraska.

2020 ◽  
Author(s):  
Timothy P Lyons ◽  
Larkin A Powell ◽  
Mark Vrtiska
Keyword(s):  
Growth Rate ◽  
Population Growth ◽  
Regional Growth ◽  
Branta Canadensis ◽  
Adult Survival ◽  
Canada Goose ◽  
Canada Geese ◽  
Data Set ◽  
Early Season ◽  
Capture Recapture

Harvest regulations are used to manage populations of game species. Across their range, Canada goose Branta canadensis populations have recovered from near extirpation and are now perceived as overabundant and even a nuisance or a threat to human safety in many regions. Like many states, Nebraska has liberalized harvest regulations to increase recreation opportunities for consumptive users and to control increasing numbers of Canada geese. However, the efficacy of harvest regulations to control populations of geese is unclear. We used a live capture-recapture and dead recovery data set of more than 19,000 Canada geese banded in Nebraska 2006-2017 to determine the effect of liberalized harvest regulations on goose survival and overall growth rate. Our goals were to 1) estimate demographic parameters for Canada geese in five different regions in Nebraska 2) estimate the effect of increasing daily bag limits during the early September season and regular season on survival of hatch-year, juvenile, and adult Canada geese and 3) relate the effect of estimated changes in survival to population growth rate. We found survival (0.54-0.87), fidelity (0.14-0.99), and productivity (number of young per adult, 0.17-2.08) varied substantially among regions within Nebraska. We found increasing early season bag limits, but not regular season bag limits, reduced survival in Canada geese. However, this effect was most pronounced when comparing years without an early season to years with the highest daily bag limits used in Nebraska (eight). Survival of juvenile geese (2-3 years post-hatch) were unaffected by changes in daily bag limits during any season, though the probability of reporting was greatest for this age-class. The observed reductions in survival probability of hatch-year and adult geese due to increased daily bag limits during the early season (<10%) had only weak effects on regional growth rates. Regional growth rate estimates appeared more responsive to changes in adult survival, but only decreased ~5% between years with the most liberal early-season daily bag limits to years without an early season. Our results suggest increased bag limits during the early season may reduce Canada goose survival, but has a weak impact on population growth in Nebraska.

Comparisons of body reserve buildup and use in several groups of Canada geese

1985 ◽  
Vol 63 (8) ◽  
pp. 1765-1772 ◽  
Author(s):  
S. K. Mainguy ◽  
V. G. Thomas
Keyword(s):  
Egg Laying ◽  
Branta Canadensis ◽  
Canada Geese ◽  
James Bay ◽  
Southern Ontario ◽  
Fat Reserves ◽  
Body Tissues ◽  
Northern Latitudes ◽  
Branta Canadensis Interior ◽  
Flight Muscles

Changes in proximate body composition were analyzed in nonmigratory giant Canada geese (Branta canadensis maxima) from Toronto, Ont. (43°37′N, 79°20′W), collected during early and late egg laying in 1980 and 1981, and during incubation and moult in 1981. Early nesting geese had more fat, though not more protein, than late nesting birds in both years. Geese collected in 1981 had more fat and protein than geese collected in 1980. Early and late laying females in both years lost on average 198 g (26%) of fat and 34 g (5%) of protein from the beginning to the end of laying. Fifty-eight percent of the fat reserves possessed at the beginning of laying were lost during incubation. Fat reserves of prelaying Branta canadensis interior nesting on the James Bay lowland (53°15′N, 82°09′W) in 1980 were 9% greater than those of B. c. maxima nesting in Southern Ontario. During the moult at Toronto, Canada geese lost weight from flight muscles while gaining weight in other muscles and in fat. This pattern is seen in waterfowl moulting at several latitudes, and indicates that geese moulting in both southern and northern latitudes probably rely on nutrients in food rather than in body tissues to supply growing feathers.

scholarly journals Glaucous Gull Predation of Goslings on the Yukon-Kuskokwim Delta, Alaska

The Condor ◽  
2004 ◽  
Vol 106 (2) ◽  
pp. 288-298
Author(s):  
Timothy D. Bowman ◽  
Robert A. Stehn ◽  
Kim T. Scribner
Keyword(s):  
Aerial Survey ◽  
Branta Canadensis ◽  
Canada Goose ◽  
Canada Geese ◽  
Brood Rearing ◽  
Anser Albifrons ◽  
Stratified Sample ◽  
Larus Hyperboreus ◽  
Survey Estimates ◽  
Species Specific

Abstract Glaucous Gulls (Larus hyperboreus) nesting on the Yukon-Kuskokwim (Y-K) Delta frequently prey on juvenile waterfowl. We collected 434 Glaucous Gulls from late June to early August 1994 to examine diet. Identification of undigested prey tissue, based on DNA microsatellite loci, showed three species of goslings in gull stomachs: Emperor Goose (Chen canagica), White-fronted Goose (Anser albifrons), and Cackling Canada Goose (Branta canadensis minima). Gulls that nested inland and were collected >1.6 km from the coast accounted for approximately 70% of the total gull predation on Emperor and Canada Geese, and 96% on White-fronted Geese. Our stratified sample of gull stomachs and aerial survey estimates of population size and distribution of gulls and juvenile geese enabled extrapolation of species-specific predation rates to the entire Y-K Delta. We estimated that a minimum of 21 000 Emperor Goose, 34 000 Canada Goose, and 16 000 White- fronted Goose goslings were consumed by 12 600 Glaucous Gulls during the brood-rearing period on the Y-K Delta in 1994. Minimum estimated take by gulls represented 33% of Cackling Canada Goose, 47% of Emperor Goose, and 39% of White-fronted Goose eggs estimated to have hatched in the same area as gull collections. Gulls selected the three species of geese approximately in proportion to their abundance. Although gull predation caused significant gosling mortality, its role in regulating goose populations on Y-K Delta remains unresolved. Depredación de Pichones de Gansos por Gaviotas Larus hyperboreus en el Delta del Yukon-Kuskokwim, Alaska Resumen. Las gaviotas Larus hyperboreus que nidifican en el delta del Yukon-Kuskokwim (Y-K) depredan aves acuáticas juveniles con frecuencia. Para examinar su dieta, colectamos 434 gaviotas de esta especie entre finales de junio y principios de agosto de 1994. Identificamos los tejidos de presas no digeridos con base en loci de ADN microsatelital y encontramos pichones de tres especies de gansos (Chen canagica, Anser albifrons y Branta canadensis minima) en los estómagos de las gaviotas. Las gaviotas que estaban nidificando tierra adentro y que fueron colectadas a más de 1.6 km de la costa representaron aproximadamente el 70% del total de las depredaciones de C. canagica y B. canadensis y el 96% de las de A. albifrons. Nuestra muestra estratificada de estómagos de gaviotas, junto con estimaciones del tamaño poblacional de las gaviotas y gansos juveniles hechas mediante censos desde el aire, permitieron hacer extrapolaciones de tasas de depredación especie- específicas para todo el delta Y-K. Los números estimados mínimos de pichones depredados por 12 600 gaviotas en el delta durante el período de cría de 1994 fueron 21 000 C. canagica, 34 000 B. canadensis y 16 000 A. albifrons. Estimamos que en lás áreas en que fueron colectadas, las gaviotas consumieron como mínimo el 33%, 47% y 39% del número estimado de huevos allí eclosionados de B. canadensis, C. canagica y A. albifrons, respectivamente. Las gaviotas seleccionaron a las tres especies de gansos aproximadamente en proporción a su abundancia. Aunque la depredación por gaviotas causó una mortalidad significativa de los pichones, aún debe determinarse su papel en la regulación de las poblaciones de gansos en el delta Y-K.

scholarly journals Cooperative hunting of Canada Geese (Branta canadensis) by Gray Wolves (Canis lupus) in northern Quebec

2015 ◽  
Vol 129 (3) ◽  
pp. 290 ◽  
Author(s):  
Theodore C. Nichols
Keyword(s):  
Canis Lupus ◽  
Prey Species ◽  
Branta Canadensis ◽  
Canada Goose ◽  
Canada Geese ◽  
Gray Wolves ◽  
Cooperative Hunting ◽  
Short Period

Gray Wolves (Canis lupus) are opportunistic predators that feed mainly on ungulates across their range. Incidental to a Canada Goose (Branta canadensis) leg banding program in northern Quebec, I observed what appeared to be a predation attempt by three wolves on a flock of 28 Canada Geese at a time when geese were just regaining their flight capability following their annual remige moult (4 August 2003). Although I was able to observe only a short period of this presumed predation attempt, it seemed apparent from the position of the wolves and geese that this was ambushing behaviour described by other authors with other prey species.

scholarly journals Status and trends of the Canada Goose Branta canadensis in France

Ornis Svecica ◽  
2011 ◽  
Vol 21 (2–4) ◽  
pp. 69-78
Author(s):  
Carol Fouque ◽  
Vincent Schricke
Keyword(s):  
Public Health ◽  
Branta Canadensis ◽  
Crop Damage ◽  
Canada Goose ◽  
Canada Geese ◽  
Health Issues ◽  
Local Management ◽  
Management Measures ◽  
Status And Trends

An enquiry to determine the distribution and abundance of the Canada Goose Branta candensis in France was undertaken in 2008. Responses were received from 92 out of the 96 departments. Canada Geese were reported in 56 of the 92 departments, in 8 of which the species had only appeared after 2000. For half of the 56 departments, the species was observed only in summer. Canada Geese summered in 38 departments, numbering at least 4,250 birds. At least 6,000 birds are also thought to winter in France as of 2008/2009, when the species is more widespread. Winter numbers are increasing exponentially. In 5 departments, crop damage and public health issues have resulted in local management measures in the last 3 years (e.g. egg pricking and culling of adults). We discuss the need for further regulation and legislation in the light of these conflicts and hybridisation with other species.

scholarly journals Draft Genome Sequences of Escherichia coli Strains FP2 and FP3, Isolated from the Canada Goose (Branta canadensis)

2018 ◽  
Vol 7 (9) ◽  
Author(s):  
Allison L. Denny ◽  
Susan E. Arruda
Keyword(s):  
Escherichia Coli ◽  
Draft Genome ◽  
Branta Canadensis ◽  
Canada Goose ◽  
Genome Sequences ◽  
Content Type

Draft genomes of two strains of Escherichia coli, FP2 and FP3, isolated from the feces of the Canada goose (Branta canadensis), were sequenced. Genome sizes were 5.26 Mb with a predicted G+C content of 50.54% (FP2) and 5.07 Mb with a predicted G+C content of 50.41% (FP3).

Coccidia of Canada geese(Branta canadensis) at Kortright Waterfowl Park, Guelph, Ontario, Canada, with description of Isospora anseris n.sp.

1981 ◽  
Vol 59 (3) ◽  
pp. 493-497 ◽  
Author(s):  
Robert C. Skene ◽  
O. Remmler ◽  
M. A. Fernando
Keyword(s):  
New Species ◽  
Branta Canadensis ◽  
Canada Geese ◽  
Fecal Samples ◽  
A New Species

A survey of adult Canada geese, Branta canadensis, at Kortright Waterfowl Park in Guelph, Ontario, Canada, showed that 20% of the geese sampled passed small numbers of coccidial oocysts throughout the winter months (October 1975 to February 1976). Four species of coccidia, Eimeria hermani Farr, 1953, E. magnalabia Levine, 1951, E. truncata (Raillet and Lucet, 1891) Wasielewski, 1904, and Tyzzeria parvula (Kotlan, 1933) Klimes, 1963, were identified from the samples examined. A hitherto undescribed Isospora sp. was found in 5% of the fecal samples. It is named Isospora anseris and described as a new species. In the spring goslings were found to be passing E. hermani oocysts between the 8th and 13th day of hatching.

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