Observation of Common Nighthawks (<i>Chordeiles minor</i>) and Bats (Chiroptera) Feeding Concurrently

Foley, Gabriel J.; Wszola, Lyndsie S.

doi:10.1656/045.024.0208

Cited by 3 publications

(7 citation statements)

References 8 publications

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“…Fifteen studies showed altered activity or efficacy in birds when they were exposed to ALAN [179,[193][194][195][196][197][198][199][200][201][202][203][204][205][206]. A total of three studies demonstrated altered foraging behavior in birds when they were exposed to ALAN [207][208][209]. For instance, longer foraging periods were observed in urban blackbirds (T. merula) [210].…”

Section: Birdsmentioning

confidence: 99%

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A Systematic Review for Establishing Relevant Environmental Parameters for Urban Lighting: Translating Research into Practice

et al. 2022

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The application of lighting technologies developed in the 20th century has increased the brightness and changed the spectral composition of nocturnal night-time habitats and night skies across urban, peri-urban, rural, and pristine landscapes, and subsequently, researchers have observed the disturbance of biological rhythms of flora and fauna. To reduce these impacts, it is essential to translate relevant knowledge about the potential adverse effects of artificial light at night (ALAN) from research into applicable urban lighting practice. Therefore, the aim of this paper is to identify and report, via a systematic review, the effects of exposure to different physical properties of artificial light sources on various organism groups, including plants, arthropods, insects, spiders, fish, amphibians, reptiles, birds, and non-human mammals (including bats, rodents, and primates). PRISMA 2020 guidelines were used to identify a total of 1417 studies from Web of Science and PubMed. In 216 studies, diverse behavioral and physiological responses were observed across taxa when organisms were exposed to ALAN. The studies showed that the responses were dependent on high illuminance levels, duration of light exposure, and unnatural color spectra at night and also highlighted where research gaps remain in the domains of ALAN research and urban lighting practice. To avoid misinterpretation, and to define a common language, key terminologies and definitions connected to natural and artificial light have been provided. Furthermore, the adverse impacts of ALAN urgently need to be better researched, understood, and managed for the development of future lighting guidelines and standards to optimize sustainable design applications that preserve night-time environment(s) and their inhabiting flora and fauna.

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Section: Birdsmentioning

confidence: 99%

“…Redshanks (Tringa totanus) spent less time foraging during the new moon and on clear nights [208]. Nighthawks were observed foraging at higher locations in illuminated areas [209].…”

Section: Birdsmentioning

confidence: 99%

A Systematic Review for Establishing Relevant Environmental Parameters for Urban Lighting: Translating Research into Practice

et al. 2022

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“…ALAN may provide foraging opportunities for insectivorous birds and bats by aggregating their insect prey under lights (Shields and Bildstein 1979 ; Bharos 1992 ; Foley and Wszola 2017 ). This type of foraging behavior has been documented around the world, but is undoubtedly subject to observation bias because birds foraging away from lights are less likely to be seen by humans (Buij and Gschweng 2017 ).…”

Section: Introductionmentioning

confidence: 99%

“…The family includes 89 species found on every continent other than Antarctica (Winkler et al 2020 ). Nightjars sometimes forage under artificial lights (Shields and Bildstein 1979 ; Ingels et al 1999 ; Jackson 2003 ; Foley and Wszola 2017 ) and species accounts suggest that this behaviour is common (Winkler et al 2020 ; Woods et al 2020 ; Brigham et al 2020 ). However, studies of how artificial light affects their habitat use have mixed results and are confounded by urbanization.…”

Section: Introductionmentioning

confidence: 99%

“…Breeding Bird Survey trends show both species’ populations declining across much of their range (Sauer et al 2020 ). Both have been observed foraging under artificial lights at night (Preston 2015 ; Foley and Wszola 2017 ), suggesting a potential benefit of ALAN. Common Nighthawks defend a small nest site with a behaviour called wingbooming (Knight et al 2021a ), but vocalize frequently as they travel up to tens of kilometers to forage, allowing us to separately evaluate how ALAN affects the relative abundance of territorial and extra-territorial individuals for this species.…”

Section: Introductionmentioning

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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Effects of artificial light and latitude on the dawn foraging activity of Great Tits (Parus major) during winter in northern Europe

Skryten,

Steen,

Dale

2024

Ornis Norv.

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Cover photo: Male Great Tit Parus major. Photo: Bjørn Aksel Bjerke. Recently, there has been increasing interest in the ecological consequences of artificial light on wildlife. At northern latitudes, winter is characterized by short days and low temperatures. Under these conditions, resident birds need to consume more food in a shorter time to sustain their metabolism and maintain body temperature. Access to artificial light may prolong foraging opportunities for resident birds during winter. Here, we used a field experiment to test whether Great Tits Parus major benefit from artificial light to start foraging before sunrise. Further, we conducted a meta-analysis to test if onset of foraging was correlated with latitude in the Great Tit. A feeding station with artificial light was placed in a forest area in Ås, SE Norway, at nearly 60° north. A camera was placed in front of the feeding station to record daily activity of the Great Tit in December and February. In December, Great Tits started foraging earlier relative to sunrise when artificial light was available. In February, Great Tits were not stimulated by artificial light to start foraging before sunrise. The onset of foraging in Great Tits was also correlated with latitude. At the northernmost location, Great Tits started foraging several hours before sunrise, whereas at the southernmost location, Great Tits started foraging only a few minutes before sunrise. The results suggest that resident Great Tits may utilize artificial light to prolong their foraging activity during midwinter, and that onset of foraging is advanced relative to sunrise with decreasing daylength further north. Our findings contribute to the understanding of how short days during northern winters can limit foraging activity in resident birds.

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Observation of Common Nighthawks (Chordeiles minor) and Bats (Chiroptera) Feeding Concurrently

Cited by 3 publications

References 8 publications

A Systematic Review for Establishing Relevant Environmental Parameters for Urban Lighting: Translating Research into Practice

A Systematic Review for Establishing Relevant Environmental Parameters for Urban Lighting: Translating Research into Practice

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

Effects of artificial light and latitude on the dawn foraging activity of Great Tits (Parus major) during winter in northern Europe

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