Renesting by Canvasbacks in Southwestern Manitoba

Doty, Harold A.; Trauger, David L.; Serie, Jerome R.

doi:10.2307/3801194

Cited by 16 publications

(6 citation statements)

References 7 publications

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“…Our mean renesting interval of 9.8 days was similar to that previously reported for canvasbacks (Doty et al 1984) and .3 days less than measured for redheads (Alliston 1979). The period of rapid ovarian follicle growth occurs just prior to ovulation when the daily nutritional demands of egg production increase quickly (Esler 1994).…”

Section: Renestingsupporting

confidence: 91%

“…Further, the deleterious effects of backmounted transmitters have been well documented (Pietz et al 1993, Rotella et al 1993, Ward and Flint 1995, Paquette et al 1997; thus, our estimates of renesting rate may be too low. However, our renesting rate was similar to that reported for canvasbacks (Aythya valisineria; Doty et al 1984) and lower than reported for redheads (Aythya americana; Alliston 1979) nesting under apparently ideal conditions.…”

Section: Renestingsupporting

confidence: 87%

“…Renesting interval increases and propensity to renest declines with increasing nest age at the time of destruction for several species of dabbling and diving ducks (Anatini and Aythyini; Sowls 1955, Gates 1962, Krapu et al 1983, Doty et al 1984. We controlled for the effect of nest stage at destruction, so we could examine the influence of female body size and nesting date on renesting propensity and interval.…”

Section: Renestingmentioning

confidence: 99%

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Population Dynamics of Greater Scaup Breeding on the Yukon-Kuskokwim Delta, Alaska

Flint

Grand

Fondell

et al. 2006

Wildlife Monographs

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Populations of greater scaup (Aythya marila) remained relatively stable during a period when populations of lesser scaup (A. affinis) have declined from historic levels. To assist in describing these differences in population trends, from 1991 through 2000, we studied the survival, nesting ecology, and productivity of greater scaup on the Yukon-Kuskokwim Delta (Y-K Delta), Alaska, to develop a model of population dynamics. We located nests, radio-marked females for renesting studies, estimated duckling survival, and leg-banded females to examine nest site fidelity and annual survival.Greater scaup initiated egg laying later than other species, and most clutches (.80%) were initiated over 20 days each year. We located 1,056 nests; nest success ranged from 7 to 61% among years. Following loss of their first clutch, 51% of radio-tagged females attempted to renest. Duckling survival to 30 days of age was 37.5%. Our best model suggested that annual survival did not vary among years and averaged 81%. Survival rate was positively related to structural body size. Only 8 of 214 banded individuals were reported as recovered (1 each in Maryland, Michigan, Minnesota, Washington, and Alaska and 3 in California).Using a stochastic model, we estimated that, on average, breeding females produced 0.57 young females/nesting season. We combined this estimate of productivity with our annual estimates of adult survival and an assumed population growth rate of 1.0, then solved for an estimate of first-year survival (0.40). Under these conditions the predicted stable age distribution of breeding females (i.e., the nesting population) was 15.1% 1-year-old, 4.1% 2-year-old first-time breeders, and 80.8% 2-year-old and older, experienced breeders. We subjected this stochastic model to perturbation analyses to examine the relative effects of demographic parameters on k. The relative effects of productivity and adult survival on the population growth rate were 0.26 and 0.72, respectively. Thus, compared to productivity, proportionally equivalent changes in annual survival would have 2.8 times the effect on k. However, when we examined annual variation in predicted population size using standardized regression coefficients, productivity explained twice as much variation as annual survival. Thus, management actions focused on changes in survival or productivity have the ability to influence population size; however, substantially larger changes in productivity are required to influence population trends.Wildlife Monographs 162: 1-22

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Section: Renestingsupporting

confidence: 91%

Section: Renestingsupporting

confidence: 87%

Section: Renestingmentioning

confidence: 99%

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Population Dynamics of Greater Scaup Breeding on the Yukon-Kuskokwim Delta, Alaska

Flint

Grand

Fondell

et al. 2006

Wildlife Monographs

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“…Canvasbacks have higher rates of nesting success than mallards but are more likely to forego nesting or renesting during unfavorable conditions and, hence, early nesting effort should be more highly correlated with breeding performance in canvasbacks than in mallards (Doty et al 1984, Serie and Cowardin 1990, Serie et al 1992, Anderson et al 1997. Indeed, Serie and Cowardin's (1990) study included 2 years in which nesting effort was nearly zero.…”

Section: Discussionmentioning

confidence: 99%

Social Indices of Breeding Productivity in Parkland Mallards

et al. 2008

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Social indices were developed to assess breeding productivity of waterfowl based on weekly roadside surveys of social groupings (i.e., pairs, lone M, flocked M). We calculated social indices for mallard (Anas platyrhynchos) populations breeding on 16 study sites in the Canadian parklands from 1993 to 1998 using 7 previously developed indices. We also calculated duckling:pair ratios from our roadside counts, and we obtained independent measures of nesting effort, nesting success, female success, and fledging rate for these same 16 sites from a concurrent telemetry study. Social indices were correlated (r2 = 0.28‐0.67) with telemetry‐based measures of breeding productivity in 5 of 7 cases, with the strongest relationships deriving from indices that emphasized renesting effort. The 2 ineffective social indices (r2 ≤ 0.13) both measured early onset of nesting activity. Duckling:pair ratios could be calculated more easily from the same survey data and also were correlated (r2 = 0.26‐0.48) with measures of breeding productivity. Because surveys measuring late‐nesting effort also can enumerate early hatched ducklings, we recommend that waterfowl researchers use duckling:pair ratios rather than social indices because ducking:pair ratios are more easily interpretable. Development of sightability‐adjustment factors for pair and duckling surveys could further enhance the utility of duckling:pair ratios as indices of breeding productivity in mallards.

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“…Bellrose (1976) suggested that renesting by pintails may be related to the stability and availability of water areas. Other species of ducks exhibit reduced renesting during dry years (Krapu et al 1983;Afton 1984;Doty et al 1984;Cowardin et al 1985). In 1982 and 1983, when I investigated renesting in the wild, the unadjusted number of July ponds surveyed by the Canadian Wildlife Service and the United States Fish and Wildlife Service in southern Alberta (survey strata 28 and 29) was 125 and 90, respectively, compared with the 1955-1985 mean of 112 (Waterfowl Production Survey-1985, Canadian Wildlife Service).…”

Section: Renestingmentioning

confidence: 96%

Nesting of northern pintails in Alberta: laying date, clutch size, and renesting

Duncan¹

1987

Can. J. Zool.

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DUNCAN, D. C. 1987. Nesting of northern pintails in Alberta: laying date, clutch size, and renesting. Can. J . Zool. 65: 234-246. Nesting of northern pintails was studied in southern Alberta where breeding densities are high. Adults nested earlier and laid larger clutches than did yearlings in the wild. Captive pintails nested earlier, laid larger clutches, and appeared to renest more readily than did wild birds. Food may limit each of these parameters in the wild. The reproductive output of female pintails nesting in high densities in southern Alberta appears to be lower than that of birds breeding at Delta, Manitoba, because of reduced clutch size and lower renesting rate. Clutch size was strongly correlated with laying date but the laying of larger clutches by adults in the wild (and by captive birds relative to wild birds) was not simply a consequence of earlier nesting. A number of proximate causes suggested to explain the seasonal decline in clutch size (hen age, renesting, declining food resources, and decreased body reserves) were rejected. Whatever the mechanism through which laying date influences clutch size, the ultimate reason for this phenomenon may be a seasonally declining survival rate of young which has selected for reduced reproductive effort later in the breeding season. Captive pintails fed a 14% or 29% protein diet after laying their first clutches did not differ in frequency of renesting, clutch size, or renest interval. DUNCAN, D. C. 1987. Nesting of northern pintails in Alberta: laying date, clutch size, and renesting. Can. J. Zool. 65 : 234-246. La nidification des canards pilets a fait l'objet d'une Ctude dans le sud de ]'Alberta oh la densite des canards reproducteurs est ClevCe. En nature, les adultes construisaient leur nid plus t8t et pondaient plus d'oeufs que les canards de 1 an. Les canards en captivitk nichaient Cgalement plus t8t, pondaient plus d'oeufs et semblaient plus enclins 2 nicher de nouveau que les canards pilets en nature. I1 est possible qu'on nature la nourriture constitue un facteur limitant pour chacun de ces parametres. La production d'oisillons par les femelles qui nichent en grands nombres dans le sud de ]'Alberta semble plus faible que celle des oiseaux qui se reproduisent a Delta, Manitoba, car le nombre d'oeufs pondus est moins ClevC et les nidifications rCpCties sont plus rares. Le nombre d'oeufs produits est fortement reliC a la date de ponte, mais la ponte d'un plus grand nombre d'oeufs par les adultes en nature (et par les oiseaux en captivitk comparativement aux oiseaux en nature) ne dipend pas uniquement de la date plus hiitive de la nidification. Un certain nombre d'hypothkses sur les causes immkdiates de la diminution du nombre d'oeufs pondus au cours de la saison (iige des femelles, nidifications rCpCtCes, declin des ressources alimentaires, diminution des reserves CnergCtiques) ont dQ etre rejeties. Quel que soit le mkcanisme responsable de I'influence de la date de ponte sur le nombre d'oeufs pondus, il est possible que la raison ultime du phCnom...

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Renesting by Canvasbacks in Southwestern Manitoba

Cited by 16 publications

References 7 publications

Population Dynamics of Greater Scaup Breeding on the Yukon-Kuskokwim Delta, Alaska

Population Dynamics of Greater Scaup Breeding on the Yukon-Kuskokwim Delta, Alaska

Social Indices of Breeding Productivity in Parkland Mallards

Nesting of northern pintails in Alberta: laying date, clutch size, and renesting

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