Effect of Restrictive Harvest Regulations on Survival and Recovery Rates of American Black Ducks

Francis, Charles M.; Sauer, John R.; Serie, Jerome R.

doi:10.2307/3802021

Cited by 27 publications

(29 citation statements)

References 16 publications

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“…tive exclusion of American Black Duck pairs from fertile wetlands (Merendino and Ankney 1994) have been suggested. Conversely, other studies have refuted earlier assumptions and provided contradictory evidence for each scenario (e.g., Conroy et al 1989, D'Eon et al 1994, Francis et al 1998, Hoysak and Ankney 1996, Petrie et al 2000, Seymour 1992). Much of the interest stemmed from the potential loss of American Black Ducks as a distinct species if the population decline and hybrid?…”

Section: Introductionmentioning

confidence: 94%

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

McCorquodale¹,

Knapton²

2003

Northeastern Naturalist

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Section: Introductionmentioning

confidence: 94%

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

McCorquodale¹,

Knapton²

2003

Northeastern Naturalist

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“…In duck species, hunting is thought to be a significant contribution to annual mortality [34]. We include this element of duck life history by increasing the mortality rate in both duck species during the hunting season (October-January) [35] (see §S4 in the electronic supplementary material for parameter details).…”

Section: Seasonal Mortalitymentioning

confidence: 99%

Dissecting a wildlife disease hotspot: the impact of multiple host species, environmental transmission and seasonality in migration, breeding and mortality

Brown

Drake

Stallknecht

et al. 2013

J. R. Soc. Interface.

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Avian influenza viruses (AIVs) have been implicated in all human influenza pandemics in recent history. Despite this, surprisingly little is known about the mechanisms underlying the maintenance and spread of these viruses in their natural bird reservoirs. Surveillance has identified an AIV 'hotspot' in shorebirds at Delaware Bay, in which prevalence is estimated to exceed other monitored sites by an order of magnitude. To better understand the factors that create an AIV hotspot, we developed and parametrized a mechanistic transmission model to study the simultaneous epizootiological impacts of multi-species transmission, seasonal breeding, host migration and mixed transmission routes. We scrutinized our model to examine the potential for an AIV hotspot to serve as a 'gateway' for the spread of novel viruses into North America. Our findings identify the conditions under which a novel influenza virus, if introduced into the system, could successfully invade and proliferate.

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“…Harvest rates are indexed to recovery rates (Francis et al ) where recovery rate is defined as the probability that the bird is killed by a hunter, retrieved, and reported (Brownie et al ). Under the Burnham live‐dead parameterization (Burnham ), when the majority of mortality is associated with harvested birds we assume the conditional reporting rate (the marked animal is recovered and reported; Seber ) also indexes harvest rate and therefore may be influenced by season regulations and harvest.…”

Section: Methodsmentioning

confidence: 99%

Harvest dynamics and annual survival of mallards and grey ducks

McDougall¹,

Amundson

2017

J Wildl Manag

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We examined how hunter behavior, environmental covariates, and mallard (Anas platyrhynchos) and grey duck (A. superciliosa) population indices affected per capita harvest, hunter effort (i.e., hours hunted), and hunter participation (i.e., license sales) between 1997 and 2012 in the Eastern Fish and Game Region of New Zealand. Additionally, we examined how total annual hunter effort and harvest affected annual survival and harvest rates (i.e., the proportion of the population that is harvested). Per capita harvest increased with hunter effort and bag limits; hunter effort decreased over time, but effort and participation increased with mallard population size. Juvenile harvest rates were greater than for adults and negatively associated with population size. The relationship between harvest regulations and harvest rates was inconsistent. The 44-day seasons had greater juvenile harvest rates than the 57-and 72-day seasons. Similarly, years with a 7-bag limit had higher juvenile harvest rates than years with a 10-bag limit. Hunter effort affected annual survival rates, especially for females. Alternatively or concordantly, hunter effort may be a surrogate for population size and thus, survival rate may have been density dependent. The relationship between harvest and density-dependent mortality may in part be augmented by hunter behavior; fewer hunters hunted for fewer hours in years with relatively few birds. Our results suggest bag limits are more effective than season length at managing harvest; reducing bag limits to <2 birds/day from !7 could decrease harvest by as much as 50%. Furthermore, regulation consistency, better education, and enforcement of season regulations may improve harvest management; 58% of active hunters reported they shot mallards or grey ducks after the close of the 31-day season, which accounted for 13% of total harvest. Ó

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Effect of Restrictive Harvest Regulations on Survival and Recovery Rates of American Black Ducks

Cited by 27 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

Dissecting a wildlife disease hotspot: the impact of multiple host species, environmental transmission and seasonality in migration, breeding and mortality

Harvest dynamics and annual survival of mallards and grey ducks

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