Spiders become good fighters after being castrated

Along with losing the genitals at a time of lovemaking, male spiders are able to throw away the excess mass and become skilled warriors.

A year ago, the University of Singapore reported that the male spiders of the species, Nephilengys malabarensis, had castrated themselves when paired with female spiders. The last burning in the tactile leg (that male spider has two such legs) has been transformed into a sperm pouch, when intercourse has fully inserted into the genital tract of the female spider and this 'pump' fall to lie down. It is said that the sex organ of male spider is to become a closed knot, forcing the female spider to be 'faithful' because no other male spider guy can show 'love tools' of I went into pouring semen.

But that's not exactly the intention of the selfish and distant spider, because the female spider has two sexual holes. Covered with a hole, the female spider had a second hole reserved for another mistress. Besides, the guy who came later often had a trick to withdraw the 'button' that the first guy had covered.

To compensate for the disadvantage, male spiders are healthy (if it survives, because the female spider is like some other insects, likes to eat their sexual partner after finishing work) and becomes a villain data, fighting very well, playing a much better combat role than the knight who flirted with lovers. But because fighting is good, running is fast. It easily succeeds in the second love (and also the last) because it has experienced and quickly escaped the pursuit of lover after the affair.

In addition, biologists have found that the ability to fight and win over those who are 'completely castrated' is much higher than those that have recently been "castrated".

Biologists believe that it is the loss of the genitals that gives male males an obvious advantage in fighting. They attempted to cut one or two genital burns in the N. malabarensis males to test their endurance and endurance. If you cut a genital organ, the spider's weight decreased by 4% and cut both - by 9%. In the first case, their tolerance (showing strength) increased by 32% and in the latter case - increased by 80%. It means that the 'eunuch' spiders consume energy for themselves less and for fighting to increase.

In short, after losing the "most precious of men" in their first marriage, the male spiders became heroes and had a big chance at their second love to retain their genetic resources.

The findings are published in the journal Biology Letters.