Orientational Responses To Different Light Stimuli By Adult and Young Sedge Warbler (Acrocephalus Schoenobaenus) During Autumn Migration: a Funnel Technique Study

Baldaccini, Natale Emilio; E, Bezzi

doi:10.1163/156853989x00420

Cited by 5 publications

(2 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Wherever the moon azimuth was, the birds primarily chose directions close to the brightest part in the funnel, i.e., in the direction of a luminous arc, visible on the typewriter correction paper in the direction diametrically opposed to that of the light source. Similar observations have been made in robins, savannah sparrows, Passerculus sandwichensis, and young sedge warblers, Acrocephalus schoenobaenus (Moore 1978(Moore , 1987bKatz 1985;Baldaccini and Bezzi 1989). Wiltschko and Wiltschko (1975a, b) observed in European Sylvia warblers only weak phototactic reactions, if any, when the azimuth of the moon's position roughly corresponded to the migratory direction of the birds.…”

Section: Influence Of the Moonsupporting

confidence: 63%

Nocturnal orientation of robins, Erithacus rubecula: birds caught during migratory flight are disoriented

Muheim

Jenni

1999

acta ethol

View full text Add to dashboard Cite

For conventional experiments on the orientation behavior of migrant birds in funnels, either handraised birds or birds caught during resting periods at stopover sites are generally used. Topographic circumstances at the Alpine pass Col de Bretolet at the Switzerland/France border allow the capture of birds during active migratory flight during the whole night. These birds are in full migratory disposition. We expected them to orient in the seasonally appropriate direction more accurately than birds that had not experienced migration just before the funnel experiment. Experiments with robins, however, revealed a strong influence of the moon on the orientation behavior. The birds did not orient in the seasonally expected migratory direction but showed positive phototaxis, usually toward the lightest part of the funnel in the direction opposite to the moon. When the moon was absent the robins were disoriented. Sunset experiments with robins caught during the night before the experiment revealed a strong phototactic reaction toward the setting sun. As reasons for this poor orientation in the absence of light stimuli, the influence of the topography of the mountainous region and magnetic anomalies can be excluded. It is concluded that freshly caught birds are too stressed when tested immediately after capture or that the migration direction cannot be maintained. Testing of night migrants in complete darkness is also of disadvantage.

show abstract

Section: Influence Of the Moonsupporting

confidence: 63%

Nocturnal orientation of robins, Erithacus rubecula: birds caught during migratory flight are disoriented

Muheim

Jenni

1999

acta ethol

View full text Add to dashboard Cite

show abstract

“…Clock-shift experiments have shown that some birds orient in the wrong direction when exposed to daylight periods shifted by several hours, even when daylength matches the local photoperiod (e.g. [40][41][42]). It is unknown whether outdoor lighting causes birds in the wild to perceive clockshifts of sufficient magnitude to disorient them.…”

Section: Background and Objectivesmentioning

confidence: 99%

Effects of artificial light on bird movement and distribution: a systematic map

et al. 2021

View full text Add to dashboard Cite

Background Artificial light is ubiquitous in the built environment with many known or suspected impacts on birds. Birds flying at night are known to aggregate around artificial light and collide with illuminated objects, which may result from attraction and/or disorientation. In other contexts, birds are repelled by light-based deterrents, including lasers and spotlights. Artificial light can also change birds’ perceptions of habitat quality, resulting in selection or avoidance of illuminated areas. Studies documenting aggregation, deterrence, and habitat selection are typically considered separate literature bodies, but they actually study a common set of populations, interventions/exposures, and responses. Our systematic map provides a comprehensive, searchable database of evidence of the effects of artificial light on bird movement and distribution, increasing both the quantity and diversity of studies that are accessible for further comparison and synthesis. We identify and describe the evidence available for four secondary questions relevant to conservation or management: aggregation/mortality at structures with artificial lights, evidence that light attracts and/or disorients birds, light-based deterrent efficacy, and the influence of continuous illumination on habitat selection. Methods Using the principles of systematic reviews and methods published in an earlier protocol, we conducted an extensive and interdisciplinary literature search. We searched multidisciplinary citation indices as well as databases and websites specific to conservation, pest management, transportation, and energy. In our map, we included all studies reporting eligible populations (birds), interventions/exposures (artificial light), and outcomes (movement through space, behaviour preceding movement, or distribution). We evaluated the quantity of available evidence based on meta-data fields related to study context, population traits, light source characteristics, and outcome variables. We used these meta-data to identify relevant evidence for each secondary question and describe aspects of our secondary questions that may support reviews (evidence clusters) and others that require more research (knowledge gaps). Review findings We manually screened 26,208 articles and coded meta-data for 490 eligible studies in a searchable database, organizing the literature to facilitate future reviews and evidence-based management. Much of the evidence was concentrated in particular locations (Northern hemisphere), taxonomic orders (Passeriformes, Charadriiformes, and others), and light wavelengths (red and white). We identified 56 distinct response variables and organized them into 3 categories (behaviour, distribution, and avian community), showing the diversity in bird responses to light. Conclusions Our database can be used to answer the secondary questions we identified and other questions about the effects of artificial light on bird movement and resulting changes to distribution. There may be sufficient evidence for a review of the weather and lunar conditions associated with collisions, which could help identify nights when reduction of artificial light is most important. Further experiments should investigate whether specific types of light can reduce collisions by increasing the detectability of structures with artificial lights. The efficacy of lasers as deterrents could be evaluated through systematic review, though more studies are needed for UV/violet lasers. To reduce the impacts of outdoor lighting on birds, research should investigate how spectral composition of white light influences bird attraction, orientation, and habitat selection.

show abstract

Migratory orientation of sedge warblers (Acrocephalus schoenobaenus) in relation to eating and exploratory behaviour

Marchetti¹,

Zehtindjiev²

2009

Behavioural Processes

View full text Add to dashboard Cite

Orientational Responses To Different Light Stimuli By Adult and Young Sedge Warbler (Acrocephalus Schoenobaenus) During Autumn Migration: a Funnel Technique Study

Cited by 5 publications

References 14 publications

Nocturnal orientation of robins, Erithacus rubecula: birds caught during migratory flight are disoriented

Nocturnal orientation of robins, Erithacus rubecula: birds caught during migratory flight are disoriented

Effects of artificial light on bird movement and distribution: a systematic map

Migratory orientation of sedge warblers (Acrocephalus schoenobaenus) in relation to eating and exploratory behaviour

Contact Info

Product

Resources

About