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1 December 2009 Specialization in Murres:The Story of Eight Specialists
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Prey items fed to chicks of eight individually-marked and known specialist Thick-billed Murres (Una lomvia) were watched over a 15–year period at Coats Island, Nunavut, and time-depth recorders attached to eight birds in two separate years. Two males were amphipod specialists, one male a cod specialist and another male a shanny specialist; two females were sculpin specialists and two capelin specialists. Although there was likely some gender-related component to diet, there were clear specializations within each gender. Specialization in diet was mirrored by specialization in foraging behavior: amphipod specialists made V-shaped dives and had short foraging ranges, shanny/cod specialists made many shallow dives, sculpin specialists made deep, U-shaped dives, while capelin specialists made V- or W-shaped dives to moderate depths. There was no clear pattern between specialties and age or reproductive success. The use of longitudinal studies in foraging behavior, as long-term studies of individuals can complement existing knowledge of the flexibility or specialization of waterbirds, is encouraged.

Kyle Hamish Elliott, Kerry J. Woo, and Anthony J. Gaston "Specialization in Murres:The Story of Eight Specialists," Waterbirds 32(4), 491-506, (1 December 2009).
Received: 27 November 2008; Accepted: 1 February 2009; Published: 1 December 2009

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