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Titolo:
Experienced chicks show biased avoidance of stronger signals: an experiment with natural colour variation in live aposematic prey
Autore:
Gamberale-Stille, G; Tullberg, BS;
Indirizzi:
Stockholm Univ, Dept Zool, Stockholm, Sweden Stockholm Univ Stockholm Sweden holm Univ, Dept Zool, Stockholm, Sweden
Titolo Testata:
EVOLUTIONARY ECOLOGY
fascicolo: 6, volume: 13, anno: 1999,
pagine: 579 - 589
SICI:
0269-7653(1999)13:6<579:ECSBAO>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
COLORED INSECT PREY; WARNING SIGNALS; PEAK-SHIFT; EVOLUTION; COLORATION; SELECTION; RESPONSES; FORM;
Keywords:
aposematism; defence; Graptostethus servus; Lygaeus equestris; predation; stimulus generalization; synergism; Tropidothorax leucopterus;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Gamberale-Stille, G Stockholm Univ, Dept Zool, Stockholm, Sweden StockholmUniv Stockholm Sweden , Stockholm, Sweden
Citazione:
G. Gamberale-Stille e B.S. Tullberg, "Experienced chicks show biased avoidance of stronger signals: an experiment with natural colour variation in live aposematic prey", EVOL ECOL, 13(6), 1999, pp. 579-589

Abstract

An important factor for understanding the evolution of warning coloration in unprofitable prey is the synergistic effect produced by predator generalisation behaviour. Warning coloration can arise and become stabilised in a population of solitary prey if more conspicuous prey benefit from a predator's previous interaction with less conspicuous prey. This study investigates whether domestic chicks (Gallus gallus domesticus) show a biased generalisation among live aposematic prey by using larvae of three species of seed bugs (Heteroptera: Lygaeidae) that are of similar shape but vary in the amount of red in the coloration. After positive experience of edible brownish prey, chicks in two reciprocal experiments received negative experience of either a slightly red or a more red distasteful larva. Attacking birds werethen divided into two treatment groups, - one presented with the same preyagain, and one presented with either a less red or a more red larva. Birdswith only experience of edible prey showed no difference in attack probability of the two aposematic prey types. Birds with experience of the less red prey biased their avoidance so that prey with a more red coloration was avoided to a higher degree, whereas birds with experience of the more red prey avoided prey with the same, but not less red coloration. Thus, we conclude that bird predators may indeed show a biased generalisation behaviour that could select for and stabilise an aposematic strategy in solitary prey.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/07/20 alle ore 15:48:21