Colonial Breeding [Compatibility Mode]

Colonial Breeding [Compatibility Mode] - Colony Colonial...

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3/16/2010 1 Colonial Breeding Pages 87-109 in Biology of Marine Birds Colony Biological definition: A group of individual organisms that live close together implication of communication and collaboration positive (beneficial) interactions Ornithological definition: restricted to group of individuals at a breeding site (‘flock’ applied to other gregarious birds away from breeding site or outside breeding season Individuals are clumped or aggregated in space Many apparently suitable nest areas nearby unoccupied Some permanence to aggregation Colony Some permanence to aggregations breeding-site tenacity of individuals stability of nesting area (e.g., cliffs) generational, many young return to fledging site Pairs in colony generally have same neighbors in successive years • In flocks neighbors are always changing – limits complexity of behavior and other interactions Disadvantages of coloniality Potential for •den s i ty-dependent mortality Colony • reduced breeding success • may apply to other animals (bats, pinnipeds) Not evident in seabirds (unresolved) Communication Necessary for group maintenance barriers may limit interactions and divide colony into groups or subcolonies Observation of responses sight: silent ‘panic flights’ of gulls and terns vocal: waves of calling • may be particularly important for species which arrive and
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This note was uploaded on 09/13/2010 for the course OCS 4012 taught by Professor Baltz,d during the Spring '08 term at LSU.

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Colonial Breeding [Compatibility Mode] - Colony Colonial...

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