Bird census and survey techniques

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Subfields: Ecology

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Attraction of petrels to artificial lights in the Canary Islands: effects of the moon phase and age class (2009, background): “…may not be reliable due to the secretive breeding behaviour of petrels (nocturnal activity, underground nests, communal burrows with only one entrance, etc.), and the rugged relief of Tenerife which makes it very difficult to provide an accurate estimate of population size (Gregory et al. 2004).”
Developing indicators for European birds (2005, methodology): “The basic question of whether an individual species, or group of species, can indicate anything about species and environmental health more broadly remains contentious; in some cases this appears to be true (e.g. Gregory et al. 2003; Gregory et al. 2004b), in others, not.”
Unstructured citizen science data fail to detect long‐term population declines of common birds in Denmark (2016, methodology): “Structured monitoring and unstructured observation data The Common Bird Monitoring (CBM) scheme in Denmark was established in 1975 (Heldbjerg et al., 2014) following standard guidelines for structured bird monitoring programmes (Gregory et al., 2004).”