A low-disturbance capture technique for ground-nesting Double-crested Cormorants (Phalacrocorax auritus)

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Capturing breeding adults of colonially nesting species can entail risks of nest failure and even colony abandonment, especially in species that react strongly to human disturbance. A low-disturbance technique for capturing specific adult Double-crested Cormorants (Phalacrocorax auritus) at a ground-nesting colony was developed to reduce these risks and is described here. Nesting habitat enhancement was used to attract Doublecrested Cormorants to nest adjacent to above-ground tunnels constructed so that researchers could capture birds by hand. Using this technique, Double-crested Cormorants (n = 87) were captured during the incubation and chick-rearing stages of the nesting cycle. Unlike alternative capture techniques, this approach allowed targeting of specific individuals for capture and recapture, minimized local disturbance, and eliminated colony-wide disturbances. The tunnel-based system presented here could be adapted to capture adults or to access the nest contents of other ground-nesting colonial species that are inclined to nest in areas of enhanced nesting habitat and adapt to anthropogenic structures in their nesting area. This system would be particularly beneficial for other wary and easily disturbed species.

Publication type Article
Publication Subtype Journal Article
Title A low-disturbance capture technique for ground-nesting Double-crested Cormorants (Phalacrocorax auritus)
Series title Waterbirds
DOI 10.1675/063.039.0210
Volume 39
Issue 2
Year Published 2016
Language English
Publisher The Waterbird Society
Contributing office(s) Coop Res Unit Seattle
Description 6 p.
First page 193
Last page 198
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