Sunday, December 15, 2019

Black shag (Phalacrocorax carbo): roost counts at Melling, Hutt Valley, and breeding in the Wellington region

TitleBlack shag (Phalacrocorax carbo): roost counts at Melling, Hutt Valley, and breeding in the Wellington region
Publication TypeJournal Article
Year of Publication2007
AuthorsPowlesland, RG, Munro, AR, Westbrooke, IM
JournalNotornis
Volume54
Issue2
Pagination93-98
Type of Articlearticle
Keywordsbreeding phenology, coastal, diet, inland, night roosts, Phalacrocorax carbo
Abstract

We counted the black shags (Phalacrocorax carbo) frequenting a night roost at Melling, 4.5 km up-river from the Hutt River mouth, Wellington, New Zealand, and studied the timing of breeding at various colonies in the Wellington region. Numbers at the roost were counted from Oct 1993 to Sep 1998: maximum and minimum mean monthly counts were in Feb and Aug, respectively. The main egg-laying period of 3 coastal colonies (0–2 km) (Mar–May) was c. 3 months earlier than at 2 inland (5 - 33 km) colonies (Jun–Aug. We discuss the possibility that the difference in timing of breeding by shags in colonies at different distances from the coast is related to the different timing of peak prey availability in the 2 habitats (coastal marine, and inland riverine).

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