FNR 24000 Lecture 19: FNR 240 lecture 19

• School: Purdue University
• Department: Forestry and Natural Resources
• Course: FNR 24000
• Professor: Wes Flynn

Document Summary

Avian brood parasitism- the layi(cid:374)g of o(cid:374)e(cid:859)s eggs i(cid:374) the (cid:374)est of a(cid:374)othe(cid:396) i(cid:374)di(cid:448)idual. Reproductive strategy whereby parasites pass off the cost of rearing their offspring onto another individual. Facultative-some eggs incubated by the mother while some are laid in foreign nests. Intraspecific-eggs laid i(cid:374) othe(cid:396) (cid:374)ests of the pa(cid:396)asite(cid:859)s o(cid:449)(cid:374) spe(cid:272)ies. Interspecific- all eggs laid in the nests of other species. 100 species are obligate brood parasites (1% of bird species; 10,000 total described bird. Do(cid:374)(cid:859)t defe(cid:374)d (cid:374)ests, i(cid:374)(cid:272)u(cid:271)ate eggs, o(cid:396) feed young. Edu(cid:272)e p(cid:396)edatio(cid:374) (cid:396)isk (cid:271)e(cid:272)ause they a(cid:396)e(cid:374)(cid:859)t o(cid:374) (cid:374)ests o(cid:396) sea(cid:396)(cid:272)hi(cid:374)g fo(cid:396) food. Host fitness is universally reduced with brood parasitism. So, (cid:449)hy do they (cid:858)let(cid:859) this happe(cid:374): evolutionary lag hypothesis. Cost of rejecting it is worse than accepting it. Parasites need to select a host-selection is not random. Parasites prefer certain host and habitat characteristics: closer to potential perches (tree) Easer to watch host: host traits-depends on the parasite species.