Movement range corresponds to scale of effect for single scale models but not for individual variables within models

Knight, Elly C.; Sólymos, Péter; Brigham, Mark; Bayne, Erin M.

doi:10.1007/s10980-022-01426-8

Cited by 1 publication

(2 citation statements)

References 44 publications

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“…We measured all landscape predictors in three buffer sizes: 400, 1600, and 6400 m, corresponding to the buffer sizes used for another study of Common Nighthawks in Canada (Knight et al 2022 ). The previous study included buffer sizes ranging from the smallest territory radius (~ 100 m) to the largest known home range radius (~ 12 km) for nighthawks in the Boreal Forest of Alberta.…”

Section: Methodsmentioning

confidence: 99%

“…The previous study included buffer sizes ranging from the smallest territory radius (~ 100 m) to the largest known home range radius (~ 12 km) for nighthawks in the Boreal Forest of Alberta. We only included three of the six buffer sizes used by Knight et al ( 2022 ) to allow for model convergence, as explained below when we describe the relative abundance models. We refer to these buffer sizes as scales, which we define as the spatial extent over which we measured landscape features (McGarigal et al 2016 ).…”

Section: Methodsmentioning

confidence: 99%

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Behaviour and landscape contexts determine the effects of artificial light on two crepuscular bird species

Adams,

Clair,

Knight

et al. 2024

Landsc Ecol

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Context Artificial light at night (ALAN) is increasing worldwide, with many ecological effects. Aerial insectivores may benefit from foraging on insects congregating at light sources. However, ALAN could negatively impact them by increasing nest visibility and predation risk, especially for ground-nesting species like nightjars (Caprimulgidae). Objectives We tested predictions based on these two alternative hypotheses, potential foraging benefits vs potential predation costs of ALAN, for two nightjar species in British Columbia: Common Nighthawks (Chordeiles minor) and Common Poorwills (Phalaenoptilus nuttallii). Methods We modeled the relationship between ALAN and relative abundance using count data from the Canadian Nightjar Survey. We distinguished territorial from extra-territorial Common Nighthawks based on their wingboom behaviour. Results We found limited support for the foraging benefit hypothesis: there was an increase in relative abundance of extra-territorial Common Nighthawks in areas with higher ALAN but only in areas with little to no urban land cover. Common Nighthawks’ association with ALAN became negative in areas with 18% or more urban land cover. We found support for the nest predation hypothesis: the were strong negative associations with ALAN for both Common Poorwills and territorial Common Nighthawks. Conclusions The positive effects of ALAN on foraging nightjars may be limited to species that can forage outside their nesting territory and to non-urban areas, while the negative effects of ALAN on nesting nightjars may persist across species and landscape contexts. Reducing light pollution in breeding habitat may be important for nightjars and other bird species that nest on the ground.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%