Changes in abundance and distribution of nesting double-crested cormorants phalacrocorax auritus in the San Francisco Bay area, 1975–2017
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Published source details
Rauzon M.J., Elliott M.L., Capitolo P.J., Tarjan L.M., McChesney G.J., Kelly J.P. & Carter H.R. (2019) Changes in abundance and distribution of nesting double-crested cormorants phalacrocorax auritus in the San Francisco Bay area, 1975–2017. Marine Ornithology, 47, 127-138.
Published source details Rauzon M.J., Elliott M.L., Capitolo P.J., Tarjan L.M., McChesney G.J., Kelly J.P. & Carter H.R. (2019) Changes in abundance and distribution of nesting double-crested cormorants phalacrocorax auritus in the San Francisco Bay area, 1975–2017. Marine Ornithology, 47, 127-138.
Summary
Provide artificial nesting sites for ground and tree-nesting seabirds
A study in 2011–2017 in San Francisco Bay, California, USA (Rauzon et al. 2019) reported that artificial nesting platforms (with artificial nests, decoys, mirrors and vocalizations) were eventually used by double-crested cormorants Phalacrocorax auritus. The platforms were installed on a new concrete bridge, built to replace an old metal bridge. For the first six years after installation, cormorants did not use the platforms. They continued to nest on the old metal bridge, which was still standing during this period. Within weeks of removal of the old metal bridge in April 2017, cormorants roosted on the platforms. By June, ≥318 nests had been built on the platforms. In 2011, stainless steel grids were suspended under the roadway of the San Francisco-Oakland Bay Bridge as nesting platforms. Additions in 2012 were: nests made from Christmas wreaths, great cormorant P. carbo decoys, mirror boxes and a sound system playing cormorant calls.
Use vocalisations to attract birds to safe areas
A study in 2011–2017 in San Francisco Bay, California, USA (Rauzon et al. 2019) reported that artificial nesting platforms (with artificial nests, decoys, mirrors and vocalizations) were eventually used by double-crested cormorants Phalacrocorax auritus. The platforms were installed on a new concrete bridge, built to replace an old metal bridge. For the first six years after installation, cormorants did not use the platforms. They continued to nest on the old metal bridge, which was still standing during this period. Within weeks of removal of the old metal bridge in April 2017, cormorants roosted on the platforms. By June, ≥318 nests had been built on the platforms. In 2011, stainless steel grids were suspended under the roadway of the San Francisco-Oakland Bay Bridge as nesting platforms. Additions in 2012 were: nests made from Christmas wreaths, great cormorant P. carbo decoys, mirror boxes and a sound system playing cormorant calls.
Use decoys to attract birds to safe areas
A study in 2011–2017 in San Francisco Bay, California, USA (Rauzon et al. 2019) reported that artificial nesting platforms (with artificial nests, decoys, mirrors and vocalizations) were eventually used by double-crested cormorants Phalacrocorax auritus. The platforms were installed on a new concrete bridge, built to replace an old metal bridge. For the first six years after installation, cormorants did not use the platforms. They continued to nest on the old metal bridge, which was still standing during this period. Within weeks of removal of the old metal bridge in April 2017, cormorants roosted on the platforms. By June, ≥318 nests had been built on the platforms. In 2011, stainless steel grids were suspended under the roadway of the San Francisco-Oakland Bay Bridge as nesting platforms. Additions in 2012 were: nests made from Christmas wreaths, great cormorant P. carbo decoys, mirror boxes and a sound system playing cormorant calls.
Use mirrors to attract birds to new sites
A study in 2011–2017 in San Francisco Bay, California, USA (Rauzon et al. 2019) reported that artificial nesting platforms (with artificial nests, decoys, mirrors and vocalizations) were eventually used by double-crested cormorants Phalacrocorax auritus. The platforms were installed on a new concrete bridge, built to replace an old metal bridge. For the first six years after installation, cormorants did not use the platforms. They continued to nest on the old metal bridge, which was still standing during this period. Within weeks of removal of the old metal bridge in April 2017, cormorants roosted on the platforms. By June, ≥318 nests had been built on the platforms. In 2011, stainless steel grids were suspended under the roadway of the San Francisco-Oakland Bay Bridge as nesting platforms. Additions in 2012 were: nests made from Christmas wreaths, great cormorant P. carbo decoys, mirror boxes and a sound system playing cormorant calls.
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