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Titolo:
Can receiver psychology explain the evolution of aposematism?
Autore:
Speed, MP;
Indirizzi:
Liverpool Hope Univ Coll, Sch Sci & Social Sci, Liverpool L16 9JD, Merseyside, England Liverpool Hope Univ Coll Liverpool Merseyside England L16 9JDde, England
Titolo Testata:
ANIMAL BEHAVIOUR
, volume: 61, anno: 2001,
parte:, 1
pagine: 205 - 216
SICI:
0003-3472(200101)61:<205:CRPETE>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
DISTASTEFUL PREY; WARNING SIGNALS; INDIVIDUAL SELECTION; RECOGNITION ERRORS; SHIFTING BALANCE; KIN SELECTION; COLORATION; MIMICRY; MEMORY; PREDATOR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
55
Recensione:
Indirizzi per estratti:
Indirizzo: Speed, MP Liverpool Hope Univ Coll, Sch Sci & Social Sci, Hope Pk, Liverpool L16 9JD, Merseyside, England Liverpool Hope Univ Coll Hope Pk Liverpool Merseyside England L16 9JD
Citazione:
M.P. Speed, "Can receiver psychology explain the evolution of aposematism?", ANIM BEHAV, 61, 2001, pp. 205-216

Abstract

The evolution of aposematism is difficult to explain because: (1) new aposematic morphs will be relatively rare and thus risk extinction during predator education; and (2) aposematic morphs lack the protection of crypsis, and thus appear to invite attacks. I describe a simple method for evaluating whether rare aposematic morphs may be selectively advantaged by their effects on predator psychologies. Using a simulated virtual predator, I considerthe advantages that might accrue to dispersed and aggregated morphs if aposematic prey can cause neophobic avoidance, accelerate avoidance learning and decelerate predator forgetting. Simulations show that aposematism is very hard to explain unless there are particular combinations of ecological and psychological factors. If prey are dispersed throughout a locality then aposematism will be favoured only if (1) there is neophobia, learning effects and forgetting or if (2) there are learning effects and warning signals reduce forgetting rates. However, the best scenario for aposematic advantageinvolves learning rates, forgetting and neophobia when prey are aggregated. Prey aggregation has two important effects. First, it is a highly effective way to maximize the per capita benefits of the neophobia. Second, after an attack on a single prey the benefits of learnt aversions will be immediately conferred on the surviving members of an aggregation without the diluting effects of forgetting. Aggregation therefore provides good protection against forgetting. The simulations thus provide new insights into the complexities of aposematic protection and suggest some important directions for empirical work. (C) 2001 The Association for the Study of Animal Behaviour.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/07/20 alle ore 07:06:05