Abstract:
:Some organisms maintain a battery of defensive strategies against their exploiters (predators, parasites or parasitoids), while others fail to employ a defence that seems obvious. In this paper, we shall investigate the circumstances under which defence strategies might be expected to evolve. Brood parasites and their hosts provide our main motivation, and we shall discuss why the reed warbler Acrocephalus scirpaceus has evolved an egg-rejection but not a chick-rejection strategy as a defence against the common (Eurasian) cuckoo Cuculus canorus, while the superb fairy-wren Malurus cyaneus has evolved a chick-rejection but not an egg-rejection strategy as a defence against Horsfield's bronze-cuckoo Chrysococcyx basalis. We suggest that the answers lie in strategy-blocking, where one strategy (the blocking strategy) prevents the appearance of another (the blocked strategy) that would be adaptive in its absence. This may be common in exploiter-victim systems.
journal_name
Bull Math Bioljournal_title
Bulletin of mathematical biologyauthors
Britton NF,Planqué R,Franks NRdoi
10.1007/s11538-006-9178-5subject
Has Abstractpub_date
2007-04-01 00:00:00pages
957-88issue
3eissn
0092-8240issn
1522-9602journal_volume
69pub_type
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