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Ibis (2003), 145 (online), E53E58 2003 British Ornithologists' Union
 

Summary: Ibis (2003), 145 (online), E53E58
2003 British Ornithologists' Union
Blackwell Publishing Ltd.
Evolution of single-chick broods in the Swallow-tailed
Gull Creagrus furcatus
ANA AGREDA1
& DAVID J. ANDERSON2
*
1
Department of Biology, Catholic University of Ecuador, Quito, Ecuador
2
Department of Biology, Wake Forest University, Winston-Salem NC 271097325, USA
Swallow-tailed Gulls lay single-egg clutches, and so raise single-chick broods. As they are
pelagic seabirds, this small brood size is expected to relate to proximate food limitation
owing to infrequent food deliveries. However, a previous brood doubling experiment
detected an 82% increase in fledging success from experimentally doubled broods compared
to controls.We repeated the brood doubling experiment,and found that none of 50 enlarged
broods produced more than one independent offspring. Control and experimental parents
produced fledglings of similar body size, which also had indistinguishable rates of fledging
and subsequent survival and reproduction. A variety of parameters estimating survival and

  

Source: Anderson, David J. - Department of Biology, Wake Forest University

 

Collections: Environmental Sciences and Ecology