Reproductive Success and Female Survival Affect Local Population Density of Canvasbacks

Anderson, M.; Emery, Robert B.; Arnold, Todd W.

doi:10.2307/3802115

Cited by 23 publications

(31 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…True survival probability ranged from 0.652 (s^E = 0.078) to 1.000 (s^E = 0.109) (Table 3), and these estimates were higher for all years of the study than estimates of apparent survival probability reported in a previous analysis (Anderson et al, 1997) of Canvasbacks at Minnedosa that used only CJS modeling. True survival was estimated with poor precision because recovery probabilities (fi) for adult female Canvasbacks were low, particularly during the later years of the study (Table 4).…”

Section: Model Name No Parameters Aaiccmentioning

confidence: 77%

“…During each year of the study (1983-1992), Canvasbacks were encountered in May and June while incubating their nests or in August when adult females attended broods (Anderson et al, 1997). Individuals captured in August (1983-1989) were marked with nasal saddles (Sugden and Poston, 1968) and aluminum leg bands.…”

Section: An Examplementioning

confidence: 99%

“…Observations of Canvasbacks were obtained by reading nasal saddles with binoculars or spotting scopes (1984-1992). Observations were conducted starting in April of each year, when Canvasbacks returned to the Minnedosa region, and continued through nest-ing and rearing of ducklings (Anderson et al, 1997). Encounters of marked individuals were also obtained by recapturing nasal-saddled individuals during nesting or brood rearing.…”

Section: An Examplementioning

confidence: 99%

“…In 1983, one author (MGA) initiated a long-term study of breeding ecology of Canvasback ducks ( A ythya valisineria) near Minnedosa, Manitoba (Anderson, Emery, and Arnold, 1997). This study investigated the general life history of Canvasbacks, but the investigator was specifically interested in philopatry and dispersal because of the importance of these parameters in dynamics of open populations (Rockwell and Barrowclough, 1987;Hanski and Gilpin, 1991;Nichols et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Combining Band Recovery Data and Pollock's Robust Design to Model Temporary and Permanent Emigration

et al. 2001

Self Cite

View full text Add to dashboard Cite

Capture-recapture models are widely used to estimate demographic parameters of marked populations. Recently, this statistical theory has been extended to modeling dispersal of open populations. Multistate models can be used to estimate movement probabilities among subdivided populations if multiple sites are sampled. Frequently, however, sampling is limited to a single site. Models described by Burnham (1993, in Marked Individuals in the Study of Bird Populations, 199-213), which combined open population capture-recapture and band-recovery models, can be used to estimate permanent emigration when sampling is limited to a single population. Similarly, Kendall, Nichols, and Hines (1997, Ecology 51, 563-578) developed models to estimate temporary emigration under Pollock's (1982, Journal of Wildlife Management 46, 757-760) robust design. We describe a likelihood-based approach to simultaneously estimate temporary and permanent emigration when sampling is limited to a single population. We use a sampling design that combines the robust design and recoveries of individuals obtained immediately following each sampling period. We present a general form for our model where temporary emigration is a first-order Markov process, and we discuss more restrictive models. We illustrate these models with analysis of data on marked Canvasback ducks. Our analysis indicates that probability of permanent emigration for adult female Canvasbacks was 0.193 (SE = 0.082) and that birds that were present at the study area in year i - 1 had a higher probability of presence in year i than birds that were not present in year i - 1.

show abstract

Section: Model Name No Parameters Aaiccmentioning

confidence: 77%

Section: An Examplementioning

confidence: 99%

Section: An Examplementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Combining Band Recovery Data and Pollock's Robust Design to Model Temporary and Permanent Emigration

et al. 2001

Self Cite

View full text Add to dashboard Cite

show abstract

“…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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Individual heterogeneity in black brant survival and recruitment with implications for harvest dynamics

Lindberg

Sedinger

Lebreton³

2013

Ecology and Evolution

View full text Add to dashboard Cite

We examined individual heterogeneity in survival and recruitment of female Pacific black brant (Branta bernicla nigricans) using frailty models adapted to a capture-mark-recapture context. Our main objectives were (1) to quantify levels of heterogeneity and examine factors affecting heterogeneity, and (2) model the effects of individual heterogeneity on harvest dynamics through matrix models. We used 24 years of data on brant marked and recaptured at the Tutakoke River colony, AK. Multievent models were fit as hidden Markov chain using program E-SURGE with an adequate overdispersion coefficient. Annual survival of individuals marked as goslings was heterogeneous among individuals and year specific with about 0.23 difference in survival between "high" (0.73)-and "low" (0.50)-quality individuals at average survival probability. Adult survival (0.85 AE 0.004) was homogeneous and higher than survival of both groups of juveniles. The annual recruitment probability was heterogeneous for brant >1-year-old; 0.56 (AE0.21) and 0.31 (AE0.03) for high-and low-quality individuals, respectively. Assuming equal clutch sizes for high-and low-quality individuals and that 80% of offspring were in the same quality class as the breeding female resulted in reproductive values about twice as high for highquality individuals than low-quality individual for a given class of individuals producing differential contributions to population growth among groups. Differences in reproductive values greatly increased when we assumed high-quality individuals had larger clutch sizes. When we assumed that 50% of offspring were in the same quality class as their mothers and clutches were equal, differences in reproductive values between quality classes were greatly reduced or eliminated (breeders [BRs]). We considered several harvest scenarios using the assumption that 80% of offspring were in the same quality class as their mothers. The amount of compensation for harvest mortality declined as the proportion of high-quality individuals in the harvest increased, as differences in clutch sizes between groups decreased and as the proportion of BRs in the harvest increased. Synthesis and applications. Harvest at the same proportional level of the overall population can result in variable responses in population growth rate when heterogeneity is present in a population. k was <1.0 under every scenario when harvest rates were >10%, and heterogeneity caused as much as +2% difference in growth rates at the highest levels of proportional harvest for lowquality individuals and the greatest differences in qualities between classes of individuals, a critical difference for a population with k near 1.0 such as the brant. We observed less response in overall survival in the presence of heterogeneity because we did not observe heterogeneity in the annual survival of BRs. This analysis provides a comprehensive view of overall compensation at the population level and also constitutes the first example of a survival-recruitment ª

show abstract

Reproductive Success and Female Survival Affect Local Population Density of Canvasbacks

Cited by 23 publications

References 22 publications

Combining Band Recovery Data and Pollock's Robust Design to Model Temporary and Permanent Emigration

Combining Band Recovery Data and Pollock's Robust Design to Model Temporary and Permanent Emigration

Social Indices of Breeding Productivity in Parkland Mallards

Individual heterogeneity in black brant survival and recruitment with implications for harvest dynamics

Contact Info

Product

Resources

About