In many urban metropolitan areas, resident Canada goose (Branta canadensis) populations have grown to nuisance levels in spite of increasing harvest opportunity. To document differences in demographic parameters between urban and rural geese, I estimated probabilities of survival, recapture, recovery, and fidelity for adult resident Canada geese between 2001 and 2006 using banding, live recapture, and dead recovery data from 2 distinct banding locations in Georgia, USA. Adult survival rates were higher for urban geese (0.958, SE = 0.020) than for rural geese (0.682, SE = 0.049). Using estimated recovery probabilities of 0.505 (SE = 0.107) for urban and 0.463 (SE = 0.045) for rural geese, along with current estimates of crippling loss and reporting rate, the estimated mean harvest rate for urban geese was 0.029 (SE = 0.006) and for rural geese was 0.202 (SE = 0.020). Fidelity rates were similar between urban (0.730, SE = 0.033) and rural geese (0.713, SE = 0.069). This information suggests that urban segments of the Canada goose population have substantially higher survival than rural geese and are harvested at a very low rate, and that liberalizing hunting regulations may have little impact on Georgia's urban goose population. Wildlife managers may need to consider options other than sport hunting to control nuisance goose populations in urban areas.
1. Multiple species are often exposed to a common hunting season, but harvest and population objectives may not be fully achieved if harvest potential varies among species and/or species abundances are not correlated through time. Our goal was to develop an approach for setting a common hunting season that would recognize heterogeneity in species productivity and would select annual hunting seasons conditioned on the status of individual species.2. We first used stochastic dynamic programming to generate optimal, state-dependent harvest strategies for 18 candidate regulatory scenarios. We simulated the performance of these strategies, and then used multi-criteria decision analysis to identify preferred regulatory scenarios for duck hunting seasons in the Atlantic Flyway of the U.S.3. Generally, estimates of annual population size were not correlated among species.Mallards had the highest estimated intrinsic rate of growth, green-winged teal, wood ducks, and ring-necked ducks had intermediate values, and goldeneyes were the least productive. Estimated carrying capacity was highest for mallards and lowest for green-winged teal. 4. Managers had greatest interest in maximizing season length (33%) and aggregate duck abundance (28%), and less interest in maximizing aggregate harvest (19%) and the number of years between a change in hunting season regulations (19%).Several regulatory scenarios provided acceptable trade-offs among these objectives. Synthesis and applications.Separate hunting seasons for various species of game may be untenable, either due to the added cost and regulatory complexity, or because selective harvesting of stocks may be difficult due to problems in species identification. Rather than averaging species-specific productivities, or basing hunting seasons on the least (or most) productive species, we describe an approach in which productivity and annual population status are considered 1448 | Journal of Applied Ecology JOHNSON et al.
Mottled ducks (Anas fulvigula) were released by the South Carolina Department of Natural Resources (SCDNR) in South Carolina, USA, during 1975–1983 and expanded into Georgia, USA, in the 1990s. Banding data suggest that birds marked in Georgia are often harvested in other states. Because the South Carolina reintroduced population was able to expand into Georgia via long‐distance dispersal, a more thorough understanding of mottled duck spatial ecology in Georgia and South Carolina is needed to direct future management decisions to accommodate expanding duck populations. We used global positioning system (GPS) telemetry to investigate movements and habitat selection by 47 mottled ducks (17 males, 30 females) during 4 seasons from 2013–2016. Mean seasonal home ranges varied from 2,002–4,598 ha across sexes and seasons. We found mean distances moved within seasonal ranges varied from 3.5–11.3 km/day for birds captured in Georgia, and 1.3–5.6 km/day for those captured in South Carolina. We observed 23 excursions, in which individuals left established seasonal ranges for >6 hours and moved ≥5 km; these excursions ranged from 5 km to 139.5 km. We documented 5 dispersals ranging from 52.6 km to 245.8 km. We also documented several long‐distance movements, with 7 birds captured in Georgia moving to South Carolina and 2 moving to Florida, USA. These movements suggest mottled ducks in South Carolina and Georgia may constitute a single population. Notably, we observed dispersal and long‐distance movements only from birds marked in Georgia, suggesting that habitat may be a limiting factor along the Georgia coast. We quantified third‐order selection for mottled ducks and found seasonal selection for managed impoundments and avoidance of palustrine emergent marsh during breeding and teal seasons. Managed impoundments were limited to 4 river systems along coastal Georgia and South Carolina, resulting in much of the coastal wetlands in both states being unused by mottled ducks. We suggest the Georgia Department of Natural Resources (GADNR) and SCDNR work cooperatively to manage mottled ducks and their habitats by focusing efforts to create and manage impoundments throughout the Santee, Savannah, Altamaha, and Ashepoo‐Combahe‐Edisto (ACE) river basins in coastal Georgia and South Carolina where we documented use. © 2018 The Wildlife Society.
We developed a method for predicting wood duck (Aix sponsa) harvest rates in eastern North America using waterfowl banding and recovery data, annual indices of hunter numbers, and harvest survey data from the United States and Canada. We predicted that under the current season length (60 days), if hunter numbers remain unchanged, increasing the wood duck bag limit from 2 to 3 would increase harvest of adult male wood ducks in the Atlantic and Mississippi flyways by 12.3%, causing an increase in harvest rate of 7.1% from 0.087 to 0.093. The Flyway Councils and the United States Fish and Wildlife Service can consider this information to predict the impacts of regulatory changes.KEY WORDS Aix sponsa, bag limit, harvest rate, multiple regression, regulations, season length, wood duck.
We developed a method for predicting wood duck (Aix sponsa) harvest rates in eastern North America using waterfowl banding and recovery data, annual indices of hunter numbers, and harvest survey data from the United States and Canada. We predicted that under the current season length (60 days), if hunter numbers remain unchanged, increasing the wood duck bag limit from 2 to 3 would increase harvest of adult male wood ducks in the Atlantic and Mississippi flyways by 12.3%, causing an increase in harvest rate of 7.1% from 0.087 to 0.093. The Flyway Councils and the United States Fish and Wildlife Service can consider this information to predict the impacts of regulatory changes.
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