For some not well known mechanism, by feigning dead, the male is able to overcome more easily the resistance of the female and to maintain the contact.If the female attacks, the male feigns dead staying motionless. Based on collected data, the geographic range for Pisaura mirabilis includes 8 countries and 0 states in the United States. The mass of the prey is proportional to the size of the package. In this last case the phenomenon appears much similar to that of the spider, for the goals as well as for the strategies.This spider is commonly known in English as “nursery web spider”. Similar behaviours have been proved in other spiders such as the The offering of the nuptial gift is a very interesting behaviour and relatively common in the animal world, but how much is it really important for the reproduction, how does it work and how mush is it expensive for the male and how much useful for the female?Various researchers have studied the meanings of the nuptial gift in It takes it everywhere, with admirable parental cares, as the scientific name states © Giuseppe MazzaThe males without gift were able to mate in the 40% of the cases, whilst those with gift in the 90% and the duration of the mating was proportional to the size of the gift.

Spiders in Western and Central Europe have a mix of both one- and two-year cycles. Then opens partly the sac to observe the progeny development © Giuseppe MazzaBut other observers affirm that the dimensions of the gift increase the duration of the mating, but the brightness of the package increases the acceptance by the female.Some observer has also reported of males offering fake gifts, that is, not edible objects like leaves or twigs well packaged with the silk. Thanatosis as an adaptive male mating strategy in the nuptial gift-giving spider The prosoma presents a dark median band with blurry edges on the back, and a paler line at the centre. Pisaura is een geslacht van spinnen uit de familie van de kraamwebspinnen (Pisauridae).. Soorten. It seems therefore that the males generally do not tend to simulate particularly attractive gifts fooling the female with the packing.The shape and the colour of the package have no influence and also gifts not wrapped in silk are accepted, often even better than those well done. It seems that the wrapping favours however the male because, maybe due to the time necessary for “unwrapping” the gift, the risk that the female steals the pack and goes away without giving herself decreases.Then, after a couple of weeks, it sticks the sac on the vegetation, and weaves around, as protection, a dome-shaped web of about 5 cm of diameter. Loading... Autoplay When autoplay is enabled, a suggested video will automatically play next. The preparation of the gift involves high costs for the male and the males in poor conditions invest less time and less silk in this activity. Het mannetje neemt een 'geschenk' mee voor het vrouwtje. Moreover, it seems that the females favour the polyandry for getting an alimentary advantage thanks to the fact of receiving more gifts.Some student has suggested that the nuptial gift can be used instead as sensorial trick, mimicking the ovarian sac of the female with the purpose of stimulating the maternal instinct.The experimental findings do not support this hypothesis, seen that the shape or the silky wrapping of the gift pack do not influence the acceptance by the female and, on the contrary, the gifts not wrapped in silk appear to be better accepted than the wrapped ones. In Italy, besides this species are present, rarer, Pisaura novicia, Pisaura orientalis and Pisaura quadrilineata, present in Sardinia and in Sicily. The number and sizes of the newborns were not influenced by the gift.These results seem to exclude the hypotheses of the cannibalism and of the energetic investment and the researchers think that, on the contrary, they substantiate the hypothesis of an exhibition done by the male about its own good quality.

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