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Animals balance costs of antipredator behaviors with resource acquisition to minimize hunting and other mortality risks and maximize their physiological condition. This inherent trade‐off between forage abundance, its quality, and mortality risk is intensified in human‐dominated landscapes because fragmentation, habitat loss, and degradation of natural vegetation communities is often coupled with artificially enhanced vegetation (i.e., food plots), creating high‐risk, high‐reward resource selection decisions. Our goal was to evaluate autumn–winter resource selection trade‐offs for an intensively hunted avian generalist. We hypothesized human access was a reliable cue for hunting predation risk. Therefore, we predicted resource selection patterns would be spatiotemporally dependent upon levels of access and associated perceived risk. Specifically, we evaluated resource selection of local‐scale flights between diel periods for 426 mallards (Anas platyrhynchos) relative to wetland type, forage quality, and differing levels of human access across hunting and nonhunting seasons. Mallards selected areas that prohibited human access and generally avoided areas that allowed access diurnally, especially during the hunting season. Mallards compensated by selecting for high‐energy and greater quality foraging patches on allowable human access areas nocturnally when they were devoid of hunters. Postseason selection across human access gradients did not return to prehunting levels immediately, perhaps suggesting a delayed response to reacclimate to nonhunted activities and thus agreeing with the assessment mismatch hypothesis. Last, wetland availability and human access constrained selection for optimal natural forage quality (i.e., seed biomass and forage productivity) diurnally during preseason and hunting season, respectively; however, mallards were freed from these constraints nocturnally during hunting season and postseason periods. Our results suggest risk‐avoidance of human accessible (i.e., hunted) areas is a primary driver of resource selection behaviors by mallards and could be a local to landscape‐level process influencing distributions, instead of forage abundance and quality, which has long‐been assumed by waterfowl conservation planners in North America. Broadly, even an avian generalist, well adapted to anthropogenic landscapes, avoids areas where hunting and human access are allowed. Future conservation planning and implementation must consider management for recreational access (i.e., people) equally important as foraging habitat management for wintering waterfowl.
Animals balance costs of antipredator behaviors with resource acquisition to minimize hunting and other mortality risks and maximize their physiological condition. This inherent trade‐off between forage abundance, its quality, and mortality risk is intensified in human‐dominated landscapes because fragmentation, habitat loss, and degradation of natural vegetation communities is often coupled with artificially enhanced vegetation (i.e., food plots), creating high‐risk, high‐reward resource selection decisions. Our goal was to evaluate autumn–winter resource selection trade‐offs for an intensively hunted avian generalist. We hypothesized human access was a reliable cue for hunting predation risk. Therefore, we predicted resource selection patterns would be spatiotemporally dependent upon levels of access and associated perceived risk. Specifically, we evaluated resource selection of local‐scale flights between diel periods for 426 mallards (Anas platyrhynchos) relative to wetland type, forage quality, and differing levels of human access across hunting and nonhunting seasons. Mallards selected areas that prohibited human access and generally avoided areas that allowed access diurnally, especially during the hunting season. Mallards compensated by selecting for high‐energy and greater quality foraging patches on allowable human access areas nocturnally when they were devoid of hunters. Postseason selection across human access gradients did not return to prehunting levels immediately, perhaps suggesting a delayed response to reacclimate to nonhunted activities and thus agreeing with the assessment mismatch hypothesis. Last, wetland availability and human access constrained selection for optimal natural forage quality (i.e., seed biomass and forage productivity) diurnally during preseason and hunting season, respectively; however, mallards were freed from these constraints nocturnally during hunting season and postseason periods. Our results suggest risk‐avoidance of human accessible (i.e., hunted) areas is a primary driver of resource selection behaviors by mallards and could be a local to landscape‐level process influencing distributions, instead of forage abundance and quality, which has long‐been assumed by waterfowl conservation planners in North America. Broadly, even an avian generalist, well adapted to anthropogenic landscapes, avoids areas where hunting and human access are allowed. Future conservation planning and implementation must consider management for recreational access (i.e., people) equally important as foraging habitat management for wintering waterfowl.
Prior to the 19th century, the Mississippi Alluvial Valley (MAV) was a vast bottomland hardwood forest ecosystem with associated wetlands and intrinsic resources. Conversion for human uses in the 20th century transformed the MAV into an agriculturally dominated system. Since the late 1980s, federal and state incentivized conservation programs for landowners have helped restore wetlands on private lands in the MAV. Given the need to evaluate incentivized private lands in relation to waterfowl use, we used a sample of 241 radiomarked female mallards (Anas platyrhynchos) and evaluated their use of private and public lands in the Mississippi portion of the MAV during winters 2010–2015. Our objective was to examine mallard use of public, incentivized private, and non‐incentivized private lands and to evaluate if use changed by time of day and during and after the hunting season. Among all diurnal and nocturnal locations of mallards, 43.3% (n = 3,995) occurred on public lands, 19.5% (n = 1,802) were on incentivized private lands, and 37.2% (n = 3,432) on non‐incentivized private lands. Of mallard locations on incentivized private lands, mallards exhibited greatest use of Wetland Reserve Easements (WRE; 12.4%) and Conservation Reserve Program tracts (CRP; 4.7%). Mallards used public lands more diurnally within hunting seasons and more during hunting seasons than post‐hunting season, which we attributed to the presence of designated sanctuaries that may have provided refuge from hunting and other disturbances. Post‐hunting season, mallards increased their use of incentivized and non‐incentivized private lands, perhaps to exploit seasonal emergent wetland and remnant agricultural foods. Radiomarked mallards used a variety of landcover types across public and private land, reinforcing the importance of habitat complexes for wintering mallards and other dabbling ducks. Conservation program lands, such as CRP and WREs, provide emergent and forested wetlands that complement flooded agricultural lands and natural wetlands in the MAV. When areal availability estimates of incentivized private lands are accessible from government or other partners, we encourage future researchers to investigate selectivity by mallards and other waterfowl of public, incentivized, and non‐incentivized lands.
The equilibrium theorem provided a fundamental framework for understanding species’ distributions and movement in fragmented ecosystems. Wetland-dependent avian species are model organisms to test insular predictions within protected area networks because their mobility allows surveillance of isolated patches without landscape barriers. We hypothesized size and isolation would influence functional connectivity of sanctuaries by GPS-marked wintering mallards ( Anas platyrhynchos ) within a mesocosm protected sanctuary area network. We evaluated functional connectivity and sanctuary use, measured by movements between sanctuaries, using a multistate modeling framework. Proximity drove connectivity, underscoring that patch isolation—not size—influenced connectivity, even for an avian species with no ascertainable landscape resistance or barriers. We also found that sanctuary use increased overwintering survival by reducing harvest mortality. Our test of equilibrium theory predictions demonstrated that isolation of protected sanctuary areas supersedes their size in determining functional connectivity for mallards and access to these areas may have direct fitness consequences. Our findings could refine land acquisition, restoration, and management practices with equal or greater emphasis on adjacency in protected area network design, especially for wetland-dependent migratory gamebirds.
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