Zahavi, A. (1975). Mate selection---a selection for a handicap. Journal of Theoretical Biology, 53, 205--214.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....not of necessity strive for complexity. This is attested to by the multitude of simple organisms prevalent on this planet. Similarly, although economy is the norm amongst evolved creatures, there exist selective pressures which are capable of producing energetic, opulent and costly extravagance (Zahavi, 1975). Further, although the vast majority of the solutions to life s trials arrived at via the evolutionary process are robust systems towards which, as a designer, one might direct ones admiration, there is evidence to suggest that evolution is equally capable of generating systems which should fail ....

Zahavi, A. (1975). Mate selection -- a selection for a handicap. Journal of Theoretical Biology, 53, 205 -- 214.

....unlikely to be chosen as mates Why wouldn t all males produce the maximum advertisement, regardless of their true quality all claiming, in effect, to be the most desirable. Zahavi s handicap principle provides a possible mechanism by which a sexual signalling system could be kept honest. Zahavi [4] suggested that honesty could only be maintained in a communication system if the signals were costly in some way. He proposed the counterintuitive idea that signallers sacrifice some of their fitness (i.e. impose a handicap on themselves) in order to produce signals that will be believed by ....

Zahavi, A.: Mate selection---a selection for a handicap. JTB 53 (1975) 205--214

....models can produce counter intuitive results, and show, for instance, that of two apparently plausible theories only one is internally consistent. An excellent example of the value of a good model in theorizing about communication is the story of the handicap principle. This idea was introduced by Zahavi (1975), who proposed that signallers sacrifice some of their fitness (i.e. impose a handicap on themselves) in order to produce signals that will be believed by receivers. When the handicap principle was first introduced, it was generally not accepted by theoretical biologists. Simple ....

Zahavi, A. (1975). Mate selection---A selection for a handicap. Journal of Theoretical Biology, 53, 205--214.

.... of interest between signallers and receivers Under what circumstances should we expect wouldbe communicators to overcome the perennial problems of cheating, lying and bluffing A third possible evolutionary mechanism that could lead to honesty in a signalling system is the handicap principle (Zahavi, 1975, 1987) This is the idea that honesty can be maintained if the signals are costly in a particular way. However, the handicap principle has recently received overwhelming theoretical attention (see for example Grafen, 1990; Iwasa, Pomiankowski, Nee, 1991; Hurd, 1995; Bullock, 1997) and will only ....

Zahavi, A. (1975). Mate selection---A selection for a handicap. Journal of Theoretical Biology, 53, 205--214.

....by bluffing that selection will favour the honest signalling of fighting ability There is some existing work using simulation methods to look at communication in animal contests, notably Wheeler and de Bourcier s (1995) model of territorial signalling. Wheeler and de Bourcier found evidence for Zahavi s (1975) handicap principle, the idea that high signal costs can enforce honesty in a communication system. More relevant to the current model, however, is my own previous paper (Noble, 1998) which addressed many of the issues discussed above and supported the no cheap talk theory, contra Enquist ....

Zahavi, A. (1975). Mate selection---a selection for a handicap. Journal of Theoretical Biology, 53, 205--214.

....Author: Michael Lachmann Santa Fe Institute 1399 Hyde Park Road Santa Fe, NM 87501 USA (505) 984 8800 ext. 331 (phone) 505) 982 0565 (fax) dirk santafe.edu 1 In an in uential paper, Grafen (1990) provided a mathematical demonstration of the validity of Zahavi s handicap principle (Zahavi 1975). Grafen showed how an honest signalling system is stabilized through costly signalling: cost stabilizes the system when the cost of lying is greater than any bene t associated with doing so. Because cost serves to prevent lies, a stable signalling system clearly will require some sort of cost ....

Zahavi, A. (1975). Mate selection - a selection for a handicap. Journal of Theoretical Biology 53, 205-214.

....just so much of her time and energy on jumping. The handicap principle, which underwrites the account of stotting offered above, has been the subject of energetic debate within the evolutionary biology literature since Israeli ornithologist Amotz Zahavi first presented it over 20 years ago (Zahavi, 1975, 1977) Despite initially attracting considerable skepticism, and enjoying only intermittent empirical and theoretical support over the next decade and a half, it has achieved increasing notoriety. More recently, the central tenets of the theory have earned acceptance as a result of the ....

Zahavi, A. (1975). Mate selection --- A selection for a handicap. J. Theor. Biol., 53, 205--214.

....sexual attractiveness of potential mates is highly correlated with the actual viability, fertility, and attractiveness of the offspring they would produce. The observable traits of potential mates that correlate primarily with offspring survival prospects can be termed viability indicators (Zahavi, 1975), and the observable traits that correlate primarily with offspring reproductive prospects can be called aesthetic courtship displays of the sort analyzed by Darwin (1871) and Fisher (1930) In fact, most sexually elaborated traits such as the peacock s tail will probably play both roles to some ....

....effects of sexual dimorphism on longer term evolutionary processes have rarely been considered. Highly elaborated male courtship displays, whether behavioral or morphological, are often costly in terms of the male s economic success with respect to the surrounding econiche. Indeed, according to Zahavi s (1975) handicap theory, this cost is indirectly the reason why elaborated displays can evolve under sexual selection. If we view a dimorphic population as situated in an adaptive landscape that represents purely ecological (economic) fitness, then the females will be situated close to the fitness peak, ....

Zahavi, A. (1975). Mate selection: A selection for a handicap. Journal of Theoretical Biology, 53, 205-214.

....at a group level. The existence of stable signalling systems was one such problem. Although it was feared that the selfish actions of individuals might compromise the stability of natural signalling systems, such systems appeared to be the frequent products of evolution. In the mid seventies Zahavi (1975, 1977) proposed that the stability of such signalling systems may be maintained by a handicap principle i.e. that the differential costs paid by signallers of differing quality ensure that honest advertisement is an Evolutionarily Stable Strategy (ESS) The reasoning runs something like this. ....

....to a continuous model. 4 A Continuous Signalling Model Alan Grafen s (1990) model of Zahavi s handicap principle upheld Zahavi s contentions that in order for communication to be stable certain relationships between signal cost and signaller quality had to hold. Specifically, the criteria which Zahavi (1975, 1977) specifies are that (i) signals must be costly, and that (ii) for any given level of advertisement, signallers of low quality must suffer higher production costs than signallers of higher quality. After defining signaller (male) fitness (w) as a function of three variables, the signaller s ....

Zahavi, A. (1975). Mate selection -- a selection for a handicap. J.

....of common interest, kin effects, and reciprocal effects, acting in isolation or in concert, are likely to account for the majority of the innate communicative behaviors observed in animal species. Possible additional effects, such as the imposition of honest signaling through costly signals (Zahavi, 1975; Zahavi, 1977; Grafen, 1990) may account for additional data. Natural selection, acting through these mediums, seems well equipped to tune innate systems of communication, and the origin of this innate behavior, when examined carefully, appears relatively unmysterious. Chapter V The evolution ....

Zahavi, A. (1975). Mate selection - a selection for handicap. Journal of Theoretical Biology 53, 205--214.

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Zahavi, A. (1975). Mate selection---a selection for a handicap. Journal of Theoretical Biology, 53, 205--214.

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Zahavi, A. (1975), `Mate selection -- a selection for a handicap', Journal of Theoretical Biology, 53: 205-214.

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A. Zahavi , "Mate selection -- a selection for a handicap," J. Theor. Biol., Vol. 53, pp 205-214, 1975.

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Zahavi, A. (1975), `Mate selection -- a selection for a handicap', Journal of Theoretical Biology, 53: 205-214.

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Zahavi, A. (1975). Mate selection: A selection for a handicap. Journal of Theoretical Biology, 53, 205-214.

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A. Zahavi, "Mate selection---a selection for a handicap", J. Theor. Biol. 53 (1975) 205--214.

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Zahavi, A. (1975). Mate selection -- a selection for a handicap. Journal of Theoretical Biology, 53, 205 --

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