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Is there a weekend bias in clutch-initiation dates from citizen science? Implications for studies of avian breeding phenology.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Cooper, Caren B.
Spatial Coverage	United States
Description	Author Affiliation: Cooper CB ( Cornell Lab of Ornithology, 159 Sapsucker Woods Road, Ithaca, NY, 14850, USA, caren.cooper@cornell.edu.)
Abstract	Accurate phenology data, such as the timing of migration and reproduction, is important for understanding how climate change influences birds. Given contradictory findings among localized studies regarding mismatches in timing of reproduction and peak food supply, broader-scale information is needed to understand how whole species respond to environmental change. Citizen science-participation of the public in genuine research-increases the geographic scale of research. Recent studies, however, showed weekend bias in reported first-arrival dates for migratory songbirds in databases created by citizen-science projects. I investigated whether weekend bias existed for clutch-initiation dates for common species in US citizen-science projects. Participants visited nests on Saturdays more frequently than other days. When participants visited nests during the laying stage, biased timing of visits did not translate into bias in estimated clutch-initiation dates, based on back-dating with the assumption of one egg laid per day. Participants, however, only visited nests during the laying stage for 25% of attempts of cup-nesting species and 58% of attempts in nest boxes. In some years, in lieu of visit data, participants provided their own estimates of clutch-initiation dates and were asked 'did you visit the nest during the laying period?' Those participants who answered the question provided estimates of clutch-initiation dates with no day-of-week bias, irrespective of their answer. Those who did not answer the question were more likely to estimate clutch initiation on a Saturday. Data from citizen-science projects are useful in phenological studies when temporal biases can be checked and corrected through protocols and/or analytical methods.
File Format	HTM / HTML
ISSN	00207128
Issue Number	7
Volume Number	58
e-ISSN	14321254
Journal	International Journal of Biometeorology
Language	English
Publisher	Springer
Publisher Date	2014-09-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Biophysics Birds Physiology Nesting Behavior Reproduction Research Design Volunteers Animals Climate Change Humans Time Factors United States Journal Article
Content Type	Text
Resource Type	Article
Subject	Ecology Health, Toxicology and Mutagenesis Atmospheric Science

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Is there a weekend bias in clutch-initiation dates from citizen science? Implications for studies of avian breeding phenology.

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