Tradeoffs between predation risk and fruit resources shape habitat use of landbirds during autumn migration

McCabe, Jennifer D.; Olsen, Brian J.

doi:10.1642/auk-14-213.1

Cited by 31 publications

(26 citation statements)

References 44 publications

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“…This suggests less exploratory movements and may represent a willingness to ''settle'' for riskier foraging conditions, as has been documented in migrants that travel large distances (Metcalfe and Furness 1984, Pomeroy et al 2008, McCabe and Olsen 2015. In contrast to our expectation, and patterns seen for other species (e.g., Purple Marin; Van Loon et al 2017), blackpolls from more distant breeding latitudes spent less time on stopover.…”

Section: Discussionsupporting

confidence: 48%

Prolonged stopover and consequences of migratory strategy on local-scale movements within a regional songbird staging area

Smetzer

King

2018

The Auk

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Section: Discussionsupporting

confidence: 48%

Prolonged stopover and consequences of migratory strategy on local-scale movements within a regional songbird staging area

Smetzer

King

2018

The Auk

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“…In contrast, others may make large stopover movements (Chernetsov , Taylor et al ), or move fairly continuously throughout stopover (Aborn and Moore , Chernetsov ). Food availability and habitat structure both influence stopover habitat use (Buler et al , Mudrzynski and Norment , McCabe and Olsen , b), and thus the degree to which migrants relocate during stopover to fine‐tune habitat selection (Chernetsov ). Fruit availability plays a principal role for highly frugivorous species, and vegetation structure for more omnivorous migrants (Wolfe et al ).…”

Section: Discussionmentioning

confidence: 99%

“…Fruit availability plays a principal role for highly frugivorous species, and vegetation structure for more omnivorous migrants (Wolfe et al ). During migration, vireos are highly frugivorous (Parrish , Smith and McWilliams ), and strongly associated with deciduous and mixed‐deciduous forests, dense hardwood understory (Moore and Simons , Suomala et al ), and abundant fruits (McCabe and Olsen ). The capture site contained all these habitat attributes, and likely provided excellent stopover resources for vireos.…”

Section: Discussionmentioning

confidence: 99%

“…) situated on a coastal peninsula in Steuben Maine, United States (44.40846°N, 67.90502°W). The 888 ha refuge is 90% mixed deciduous forest (McCabe and Olsen ) composed of mountain ash Sorbus americana , red maple Acer rubrum , red Picea rubens , black P. mariana and white spruce P. glauca interspersed with dense fruit‐bearing shrubs (McCabe and Olsen ) including alder Alnus spp. wild raisin Viburnum cassinoides , raspberry Rubus spp., bayberry Myrica spp., and blueberry barrens Vaccinium spp.…”

Section: Methodsmentioning

confidence: 99%

“…Many songbirds face especially high energy demands and low fuel stores when they reach the eastern coast of the US (Moore et al , Petit ) where they encounter unfamiliar habitats with high competition and predation pressure (Richardson , Åkesson , Ydenberg et al ). Since stopover habitat can influence energetic condition (Moore et al ), the ability to evade predators (McCabe and Olsen ), migration rate (Wikelski et al , Åkesson et al ), and fitness in subsequent life stages (Runge and Marra , Smith and Moore , Newton , Norris and Taylor ), the habitat choices that migrants make in coastal environments may have important fitness consequences.…”

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confidence: 99%

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Fall migratory departure decisions and routes of blackpoll warblers Setophaga striata and red‐eyed vireos Vireo olivaceus at a coastal barrier in the Gulf of Maine

Smetzer

King

Taylor

2017

Journal of Avian Biology

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Each year, millions of songbirds concentrate in coastal areas during fall migration. The choices birds make at the coast about stopover habitat use and migratory route can influence both the success of their migratory journey and fitness in subsequent life stages. We made use of a regional‐scale automated radio telemetry array to study stopover and migratory flights and migratory routes of blackpoll warblers Setophaga striata and red‐eyed vireos Vireo olivaceus during fall migration in the Gulf of Maine, USA. We focused on differences between species, sexes, age groups, breeding origins, and time of year. Both species made within‐stopover relocations (i.e. ‘stopover flights’) from the coastal capture site. Stopover flights were primarily oriented inland, and were more frequent for blackpolls (87%) than vireos (44%). By studying migratory behavior at a broad spatial scale, we demonstrated that most blackpolls and vireos took coastal and offshore routes through the Gulf of Maine, despite initially relocating inland from the capture site. Though we captured blackpolls and vireos from a broad breeding range, more than 70% of migratory flights from the capture site were oriented for coastal or offshore travel for both species, suggesting that birds actively chose coastal and offshore routes, and were not simply displaced by wind drift. Later vireos oriented offshore more frequently during migratory flights from the coast, indicating that they may be more inclined towards time‐minimizing overwater flight routes and thus more exposed to coastal and offshore collision hazards than earlier conspecifics.

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Human access constrains optimal foraging and habitat availability in an avian generalist

Masto,

Blake‐Bradshaw,

Highway

et al. 2024

Ecological Applications

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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.

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Tradeoffs between predation risk and fruit resources shape habitat use of landbirds during autumn migration

Cited by 31 publications

References 44 publications

Prolonged stopover and consequences of migratory strategy on local-scale movements within a regional songbird staging area

Prolonged stopover and consequences of migratory strategy on local-scale movements within a regional songbird staging area

Fall migratory departure decisions and routes of blackpoll warblers Setophaga striata and red‐eyed vireos Vireo olivaceus at a coastal barrier in the Gulf of Maine

Human access constrains optimal foraging and habitat availability in an avian generalist

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