Survival of American Black Ducks Radiomarked in Quebec, Nova Scotia, and Vermont

Longcore, Jerry R.; McAuley, Daniel G.; Clugston, David A.; Bunck, Christine M.; Giroux, Jean‐François; Ouellet, Clement; Parker, G. R.; Dupuis, Pierre; Stotts, Daniel B.; Goldsberry, James R.

doi:10.2307/3802996

Cited by 16 publications

(36 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…tion (Ankney et al 1987(Ankney et al , 1989, harvest from hunting (Grandy 1983, Longcore et al 2000, competition from male Mallards with male American Black Ducks for mates Weatherhead 1984, Brodsky et al 1989), human disturbance (Morton 1998), and competi? tive exclusion of American Black Duck pairs from fertile wetlands (Merendino and Ankney 1994) have been suggested.…”

Section: Introductionmentioning

confidence: 99%

Changes in Numbers of Wintering American Black Ducks and Mallards in Urban Cape Breton Island, Nova Scotia

McCorquodale¹,

Knapton²

2003

Northeastern Naturalist

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Changes in Numbers of Wintering American Black Ducks and Mallards in Urban Cape Breton Island, Nova Scotia

McCorquodale¹,

Knapton²

2003

Northeastern Naturalist

View full text Add to dashboard Cite

“…As described in Longcore et al (), the Vermont–Quebec study site (44°57′N, 73°10′W) was centered at the 34‐km 2 MNWR and was near the Vermont–Quebec international boundary that crosses Missisquoi Bay of Lake Champlain (Fig. ).…”

Section: Study Areamentioning

confidence: 99%

“…The American black duck ( Anas rubripes , hereafter black duck) population declined from the 1960s through the 1980s (Longcore et al ). Concerns about the role of harvest in this decline led to an evaluation of survival rates for black ducks during the waterfowl hunting seasons of 1990 and 1991 at breeding and staging areas in Quebec, Nova Scotia, and Vermont (Longcore et al ). As part of that study in Vermont, we marked a cohort of hatching year (HY), female mallards ( Anas platyrhynchos ) to determine if survival and mortality sources differed from that of HY black ducks (F and M).…”

mentioning

confidence: 99%

“…Habitat characteristics (Longcore et al ) and hunter behavior (Garrettson et al ) in the area affect harvest. Environment Canada, Quebec Region, reported between 7 and 26 (

true \bar{x}

= 15) baiting or hunting on a baited area violations per year during 2008–2013 (M. Mills, Canadian Wildlife Service, personal communication).…”

mentioning

confidence: 99%

“…To evaluate these hypotheses our secondary objectives were to determine where (i.e., U.S. vs. Canada) marked mallards were killed, body condition of killed and crippled ducks, behavior of ducks, and circumstances of hunter encounters with radio‐marked mallards. Finally, to compare mallard survival rates with that of female and male black ducks we incorporated data from the Vermont–Quebec staging area (Longcore et al ) for analysis.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Survival of female mallards along the Vermont–Quebec border region

et al. 2015

Self Cite

View full text Add to dashboard Cite

Understanding effects of location and timing of harvest seasons on mortality of ducks and geese from hunting is important in forming regulations that sustain viable waterfowl populations throughout their range. During 1990 and 1991 we alternately marked 80 hatching year (HY), female mallards along the Vermont-Quebec border; half with radio-transmitters and bands and half with only aluminum leg bands. We monitored radio-marked ducks daily and recorded survival status weekly for 15 weeks from August until December each year. Mallard mortalities began 25 September when the hunting season opened in the Province of Quebec, Canada. Overall survival of mallards at week 10 did not differ between years (0.51 in 1990 vs. 0.43 in 1991) or differ from that of HY American black ducks (0.44 females, 0.42 males) based on proportional hazard analysis in a Bayesian framework. The mortality rates for mallards from hunting (0.47) and causes unrelated to hunting (0.06) were similar between years and to those rates for HY black ducks at that same site. Hunter harvest accounted for most of the mortality recorded during this study and illegal feeding (i.e., baiting) at sites just before and during the hunting season was observed. Females with lower body condition index had greater mortality rates; a 1-standard-deviation increase in condition index would reduce mortality hazard by about 29%. Management options that may increase mallard survival in the area include lowering daily bag limit in Quebec and suspending split hunting seasons in Vermont that increase harvest, delaying opening date of hunting in Quebec to allow for increased body condition before hunting season opens, and improving enforcement of baiting restrictions. Published 2015. This article is a U.S. Government work and is in the public domain in the USA.

show abstract

Evaluation of a two‐season banding program to estimate and model migratory bird survival

Devers

Emmet

Boomer

et al. 2021

Ecological Applications

View full text Add to dashboard Cite

The management of North American waterfowl is predicated on long‐term, continental‐scale banding implemented prior to the hunting season (i.e., July–September) and subsequent reporting of bands recovered by hunters. However, single‐season banding and encounter operations have a number of characteristics that limit their application to estimating demographic rates and evaluating hypothesized limiting factors throughout the annual cycle. We designed and implemented a two‐season banding program for American Black Ducks (Anas rubripes), Mallards (A. platyrhynchos), and hybrids in eastern North America to evaluate potential application to annual life cycle conservation and sport harvest management. We assessed model fit and compared estimates of annual survival among data types (i.e., pre‐hunting season only [July–September], post‐hunting season only [January–March], and two‐season [pre‐ and post‐hunting season]) to evaluate model assumptions and potential application to population modeling and management. There was generally high agreement between estimates of annual survival derived using two‐season and pre‐season only data for all age and sex cohorts. Estimates of annual survival derived from post‐season banding data only were consistently higher for adult females and juveniles of both sexes. We found patterns of seasonal survival varied by species, age, and to a lesser extent, sex. Hunter recovered birds exhibited similar spatial distributions regardless of banding season suggesting banded samples were from the same population. In contrast, goodness‐of‐fit tests suggest this assumption was statistically violated in some regions and years. We conclude that estimates of seasonal and annual survival for Black Ducks and Mallards based on the two‐season banding program are valid and accurate based on model fit statistics, similarity in survival estimates across data and models, and similarities in the distribution of recoveries. The two‐season program provides greater precision and insight into the survival process and will improve the ability of researchers and managers to test competing hypotheses regarding population regulation resulting in more effective management.

show abstract

Survival of American Black Ducks Radiomarked in Quebec, Nova Scotia, and Vermont

Cited by 16 publications

References 16 publications

Changes in Numbers of Wintering American Black Ducks and Mallards in Urban Cape Breton Island, Nova Scotia

Changes in Numbers of Wintering American Black Ducks and Mallards in Urban Cape Breton Island, Nova Scotia

Survival of female mallards along the Vermont–Quebec border region

Evaluation of a two‐season banding program to estimate and model migratory bird survival

Contact Info

Product

Resources

About