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TheAuk 112(4):860-869, 1995 THE ROLE OF PARENTS IN SIBILICIDAL BROOD
 

Summary: TheAuk 112(4):860-869, 1995
THE ROLE OF PARENTS IN SIBILICIDAL BROOD
REDUCTION OF TWO BOOBY SPECIES
DAVID J. ANDERSON
DepartmentofBiology,LeidyLaboratory,UniversityofPennsylvania,
Philadelphia,Pennsylvania19104,USA;and
DepartmentofBiology,WakeForestUniversity,Winston-Salem,NorthCarolina27109USA·
ABSTRACr.--Parentalregulationof the probabilityand timing of avianbroodreductionis
expectedto existand evolvebecausenaturalselectionshouldfavorparentsthat matchbrood
sizeto foodavailabilitymostefficiently.Sincefoodavailabilityvariesamongspecies,inter-
specificvariation in this regulationis expected.Comparativestudyof specieswith different
broodreductionsystemsis one way to testthe hypothesisthat thesemechanismsevolveas
adaptations.Previouswork on obligatelysiblicidalMaskedBoobies(Suladactylatra)and
facultativelysiblicidalBlue-footedBoobies(S.nebouxii)hasshownthattheirdifferenthatching
asynchroniescannotfully explainthequalitativedifferencein their broodreductionsystems.
In thisstudy,I reportinterspecificdifferencesin nestshapethatappeartocontributetoearly
siblicidein MaskedBoobies,but that suppressearly siblicidein Blue-footedBoobies.Blue-
footedBoobynestshapeiscloselyregulatedby parents.Differencesin eggsizesofnestmates
do not appearto contributeto the differencein socialsystems.Received19 January1995,
accepted2 July1995.

  

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

 

Collections: Environmental Sciences and Ecology