Article scientifique 2.0

Un film (plusieurs en fait, mais j'en ai UN précis en tête) et un mythe se cachent derrière cet article paru cette semaine :

		Citation : Sexual cannibalism: high incidence in a natural population with benefits to females. Rabaneda-Bueno R, Rodriguez-Girones MA, Aguado-de-la-Paz S, Fernandez-Montraveta C, De Mas E, Wise DH, Moya-Larano J. Dpto. de Ecologia Funcional y Evolutiva, Estacion Experimental de Zonas Aridas (Consejo Superior de Investigaciones Cientificas), Almeria, Spain. BACKGROUND: Sexual cannibalism may be a form of extreme sexual conflict in which females benefit more from feeding on males than mating with them, and males avoid aggressive, cannibalistic females in order to increase net fitness. A thorough understanding of the adaptive significance of sexual cannibalism is hindered by our ignorance of its prevalence in nature. Furthermore, there are serious doubts about the food value of males, probably because most studies that attempt to document benefits of sexual cannibalism to the female have been conducted in the laboratory with non-natural alternative prey. Thus, to understand more fully the ecology and evolution of sexual cannibalism, field experiments are needed to document the prevalence of sexual cannibalism and its benefits to females. METHODOLOGY/PRINCIPAL FINDINGS: We conducted field experiments with the Mediterranean tarantula (Lycosa tarantula), a burrowing wolf spider, to address these issues. At natural rates of encounter with males, approximately a third of L. tarantula females cannibalized the male. The rate of sexual cannibalism increased with male availability, and females were more likely to kill and consume an approaching male if they had previously mated with another male. We show that females benefit from feeding on a male by breeding earlier, producing 30% more offspring per egg sac, and producing progeny of higher body condition. Offspring of sexually cannibalistic females dispersed earlier and were larger later in the season than spiderlings of non-cannibalistic females. CONCLUSIONS/SIGNIFICANCE: In nature a substantial fraction of female L. tarantula kill and consume approaching males instead of mating with them. This behaviour is more likely to occur if the female has mated previously. Cannibalistic females have higher rates of reproduction, and produce higher-quality offspring, than non-cannibalistic females. Our findings further suggest that female L. tarantula are nutrient-limited in nature and that males are high-quality prey. The results of these field experiments support the hypothesis that sexual cannibalism is adaptive to females.

La mutante ?

Non

Sans conviction : Trouble every day ?






HS
Je poste ici car je n'arrive pas à accéder à ma messagerie.
Je t'ai lu, par ailleurs, dans une discussion sur L'homme stochastique où apparut un rapprochement avec Les chronolithes; et, justement, on en parlait là. Si tu veux y jeter un oeil...

Non...

Ceci dit, meci pour le lien ;-)

		Citation : EMANUELLE ET LES DERNIERS CANNIBALES

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Rââââââh !

Entendons-nous... S'agit-il simplement d'un film où il y a un humain/animal/alien cannibale qui engendre progéniture où faut-il être plus fin ?

C't'un film et je trouve pas, ça m'énerve !!!

		Citation : ça m'énerve !!!

Je plussoye.


Ceci dit, c'est quand même marrant de chercher sur les thèmes cannibalisme/sexualité/mutants et tutti quanti...
On tombe sur de ces trucs (J'essaie encore de me représenter "a flying demon fetus"
^ ^)

Film avec canniballisme.
Où le cannibalisme procure un avantage.
Tout comme le mythe sous-jascent.

Actualité Crichton aidant...
Il n'y avait pas un passage avec une Mère d'un peuple cannibale dans Le 13ème guerrier ?
Ne serait-ce pas ça ?

Non, pas ça.
Le cannibalisme /anthropophagie doit avoir une fonction réelle, qui avantage le cannibal par rapport au non cannibal.