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Titolo:
Predator experience on cryptic prey affects the survival of conspicuous aposematic prey
Autore:
Lindstrom, L; Alatalo, RV; Lyytinen, A; Mappes, J;
Indirizzi:
Univ Jyvaskyla, Konnevesi Res Stn, Dept Biol & Environm Sci, FIN-40352 Jyvaskyla, Finland Univ Jyvaskyla Jyvaskyla Finland FIN-40352 FIN-40352 Jyvaskyla, Finland
Titolo Testata:
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES
fascicolo: 1465, volume: 268, anno: 2001,
pagine: 357 - 361
SICI:
0962-8452(20010222)268:1465<357:PEOCPA>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
DISTASTEFUL PREY; SHIFTING BALANCE; WARNING SIGNALS; DOMESTIC CHICKS; EVOLUTION; AVOIDANCE; COLORATION; RESPONSES; DIVERSITY;
Keywords:
aposematism novelty; neophobia; initial evolution; signal conspicuousness; predator psychology;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Lindstrom, L Univ Jyvaskyla, Konnevesi Res Stn, Dept Biol & Environm Sci, POB 35,YAC413-3, FIN-40352 Jyvaskyla, Finland Univ Jyvaskyla POB 35,YAC413-3 Jyvaskyla Finland FIN-40352 d
Citazione:
L. Lindstrom et al., "Predator experience on cryptic prey affects the survival of conspicuous aposematic prey", P ROY SOC B, 268(1465), 2001, pp. 357-361

Abstract

Initially aposematism, which is an unprofitable trait, e.g. noxiousness conspicuously advertised to predators, appears to be a paradox since conspicuousness should increase predation by naive predators. However, reluctance of predators for eating novel prey (e.g. neophobia) might balance the initial predation caused by inexperienced predators. We tested the novelty effects on initial predation and avoidance learning in two separate conspicuousness levels of aposematic prey by using a 'novel world' method. Half of the wild great tits (Parus major) were trained to eat cryptic prey prior to the introduction of an aposematic prey, which potentially creates a bias against the aposematic morph. Both prey types were equally novel for control birds and they should not have shown any biased reluctance for eating an aposematic prey. Knowledge of cryptic prey reduced the expected initial mortalityof the conspicuous morph to a random level whereas control birds initiallyate the conspicuous morph according to the visibility risk. Birds learned to avoid conspicuous prey in both treatments but knowledge of cryptic prey did nor increase the rate of avoidance learning. predators' knowledge of cryptic prey did not reduce the predation of the less conspicuous aposematic prey and additionally predators did not learn to avoid the less conspicuousprey These results indicate that predator psychology which was shown as reluctance for attacking novel conspicuous prey, might have been important inthe evolution of aposematism.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/07/20 alle ore 19:38:16