Survival and Philopatry of Female Redheads Breeding in Southwestern Manitoba

Arnold, Todd W.; Anderson, M.; Sorenson, Michael D.; Emery, Robert B.

doi:10.2307/3802882

Cited by 27 publications

(26 citation statements)

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“…joint recapture/recovery models) to estimate fidelity and permanent emigration of young female ducks to natal sites. Arnold et al . (2002) estimated that 26% of young female redheads [ Aythya americana (Eyton)] that survived in any given year emigrated permanently from the study area in Manitoba, Canada, yielding 74% natal fidelity rate for this redhead population.…”

Section: Discussionmentioning

confidence: 99%

Estimating natal dispersal movement rates of female European ducks with multistate modelling

Blums

Nichols²,

Hines³

et al. 2003

Journal of Animal Ecology

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Summary 1.We used up to 34 years of capture-recapture data from about 22 100 new releases of day-old female ducklings and multistate modelling to test predictions about the influence of environmental, habitat and management factors on natal dispersal probability of three species of ducks within the Engure Marsh, Latvia. 2. The mean natal dispersal distances were very similar ( c . 0·6-0·7 km) for all three species and were on average 2·7 times greater than breeding dispersal distances recorded within the same study system. 3. We were unable to confirm the kinship hypothesis and found no evidence that young first-nesting females nested closer to their relatives (either mother or sister) than to the natal nest. 4. Young female northern shovelers, like adults, moved from small islands to the large island when water level was high and vice versa when water level was low before the construction of elevated small islands. Movement probabilities between the two strata were much higher for young shovelers than adults, suggesting that young birds had not yet developed strong fidelity to the natal site. Movements of young female tufted ducks, unlike those of shovelers, were not dependent on water level fluctuations and reflected substantial flexibility in choice of first nesting sites. 5. Data for young birds supported our earlier conclusion that common pochard nesting habitats in black-headed gull colonies were saturated during the entire study period. Young females, like the two adult age groups, moved into and out of colonies with similar probability. Fidelity probability of female pochards to each stratum increased with age, being the lowest (0·62) for young ( DK ) females, intermediate (0·78) for yearlings ( SY ) and the highest (0·84) for adult ( ASY ) females. 6. Young female tufted ducks, like adults, showed higher probabilities of moving from islands to emergent marshes when water levels were higher both before and after habitat management. The relationship between the spring water levels and movement was much weaker for young females than for adults. 7. Young female diving ducks exhibited much stronger (compared to adults) asymmetric movement with respect to proximity to water, with higher movement probabilities to near-water locations than away from these locations. 8. Local survival of day-old ducklings during the first year of life was time-specific and very low (means for different strata/states 0·01-0·08) because of high rates of emigration and prefledging mortality.

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Section: Discussionmentioning

confidence: 99%

Estimating natal dispersal movement rates of female European ducks with multistate modelling

Blums

Nichols²,

Hines³

et al. 2003

Journal of Animal Ecology

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“…The first combines capture–recapture data from a specific study site with band recovery data coming from throughout the range of the studied population (Burnham 1993; Barker 1997; Frederiksen & Bregnballe 2000; Lindberg et al . 2001; Arnold et al . 2002; Doherty et al .…”

Section: Introductionmentioning

confidence: 99%

Factors affecting breeding dispersal of European ducks on Engure Marsh, Latvia

Blums

Nichols

Lindberg

et al. 2003

Journal of Animal Ecology

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Summary 1.We used up to 35 years of capture-recapture data from nearly 3300 individual female ducks nesting on Engure Marsh, Latvia, and multistate modelling to test predictions about the influence of environmental, habitat and management factors on breeding dispersal probability within the marsh. 2. Analyses based on observed dispersal distances of common pochards and tufted ducks provided no evidence that breeding success in year t influenced dispersal distance between t and t + 1. 3. Breeding dispersal distances (year t to t + 1) of pochards and tufted ducks were associated with a delay in relative nest initiation dates in year t + 1. The delay was greater for pochards ( c . 4 days) than for tufted ducks ( c . 2 days) when females dispersed > 0·8 km. 4. Northern shovelers and tufted ducks moved from a large island to small islands at low water levels and from small islands to the large island at high water levels before the construction of elevated small islands . Following this habitat management (1983-94), breeding fidelity was extremely high and not influenced by water level in the marsh for either species. 5. Because pochard nesting habitats in black-headed gull colonies were saturated during the entire study period, nesting females moved into and out of colonies with similar probabilities. Local survival probabilities and incubation body masses were higher for both yearlings ( SY ) and adults ( ASY ) nesting within gull colonies, suggesting that these females were of better quality than females nesting outside of the colonies. 6. Tufted ducks showed higher probabilities of moving from islands to emergent marshes when water levels were higher both before and after habitat management. However, rates of movement for a given water level were higher during the period before management than after. 7. Both pochards and tufted ducks exhibited asymmetric movement with respect to proximity to water, with higher movement probabilities to near-water nesting locations than away from these locations. 8. Multistate capture-recapture models provided analyses that were useful in investigating sources of variation in breeding dispersal probabilities.

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“…We evaluated goodness of fit using a parametric bootstrap routine in Program MARK (Arnold et al, 2002). We performed 1000 simulations, ranked them by model deviance, and calculated the percentage of simulations that had a larger deviance than the original model.…”

Section: Statistical Analysesmentioning

confidence: 99%

Breeding Season Survival of Female Lesser Scaup in the Northern Boreal Forest

Brook¹,

Clark²

2010

ARCTIC

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ABSTRACT. One hypothesis advanced to explain the decline in lesser scaup (Aythya affinis) populations during the past 20 years is that adult female survival has decreased. However, no survival probability estimates exist for the boreal forest, the region where most scaup breed. We captured and radio-marked female lesser scaup (n = 42) near Yellowknife, Northwest Territories, Canada, just before the breeding season in 1999 and 2000. Constant weekly survival probability was estimated using a Cormack-JollySeber model (0.96). We extrapolate this rate to estimate survival probability for the nesting season (0.80, SE = 0.09), the period when females are at greatest risk of predation. Recent estimates of annual mortality (42%) suggest that about 50% of annual female mortality occurs during the breeding season, a result similar to recent conclusions from studies of prairie-nesting lesser scaup. Further, our survival estimate provides information required to produce preliminary models of population dynamics for boreal lesser scaup, a step that could greatly improve our understanding of decline in this species.Key words: Aythya affinis, lesser scaup, boreal forest, breeding season survival, recapture probability, survival probability RÉSUMÉ. Une hypothèse qui a été avancée pour expliquer le déclin des populations du petit fuligule (Aythya affinis) au cours des 20 dernières années est que la survie de la femelle adulte a baissé. Il n'existe cependant aucune estimation de la probabilité de survie pour la forêt boréale, région où se reproduisent la plupart des fuligules. Juste avant la saison de reproduction en 1999 et 2000, on a capturé, près de Yellowknife dans les Territoires du Nord-Ouest, des fuligules femelles (n = 42) qu'on a équipées de radio-émetteurs. À l'aide du modèle de Cormack-Jolly-Seber, on a estimé la probabilité de survie hebdomadaire (0,96) sur une base constante. On a extrapolé ce taux pour estimer la probabilité de survie pour la saison de reproduction (0,80, erreur-type = 0,09), période qui représente pour les femelles le plus grand risque de prédation. De récentes estimations de la mortalité annuelle (42 %) suggèrent qu'environ 50 % de cette dernière chez la population femelle se produit durant la saison de reproduction, ce qu'on retrouve aussi dans les résultats d'études récentes sur le fuligule nichant dans la prairie. De plus, notre estimation de la survie offre des renseignements qui sont nécessaires à l'élaboration de modèles préliminaires de la dynamique des populations chez le fuligule boréal, une étape qui permettrait d'améliorer considérablement notre compréhension du déclin de l'espèce.Mots clés: Aythya affinis, fuligule, forêt boréale, survie durant la saison de reproduction, probabilité de recapture, probabilité de survie Traduit pour la revue Arctic par Nésida Loyer.

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Survival and Philopatry of Female Redheads Breeding in Southwestern Manitoba

Cited by 27 publications

References 0 publications

Estimating natal dispersal movement rates of female European ducks with multistate modelling

Estimating natal dispersal movement rates of female European ducks with multistate modelling

Factors affecting breeding dispersal of European ducks on Engure Marsh, Latvia

Breeding Season Survival of Female Lesser Scaup in the Northern Boreal Forest

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