A spider with social nature found out that work that can be done efficiently by character is different
Ali and bee are insects with a special culture that can not be seen in other animals, in which work is divided by classes with the queen as the top. Soldier ants with large body size protect small body workers, adults are classified according to sex and physical factors. Among spiders classified as arthropods, types such as "adults grow larvae for a while for a while" and "some groups gather to form a large group" have been confirmed. A research team at the Indian science graduate school studied a spider in which adults larvae larvae for a certain period of time, and found that there was a good work depending on the character of the individual, not a physical factor.
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From previous studies it has been confirmed that spider females who grow larvae in one nest have two types with high aggressiveness and obedient character. The research team at the Indian science graduate school studied the behavior and characteristics of offensive spiders and obedient spiders and examined whether there is any difference between them.
From research, aggressive spiders are twice as efficient in catching prey, triple the frequency of attacks against intruders, and nearly three times faster than obedient ones I found out that he was successful in driving out intruders. The nests made by aggressive spiders were also found to last 65% longer than those made by obedient spiders.
Then, what is obedient spider specializing in the world? According to the research team, the reason for its existence was clarified by thoroughly tracking the actions of obedient spiders. Apparently obedient spiders seem to be storing energy for breeding, but in fact it turned out to be specialized in nurturing larvae.
When there were ten larvae in one nest there was no significant difference in terms of breeding larvae between aggressive spiders and obedient spiders. However, when the number of larvae exceeds 25 animals, it turned out that about half of the obedient spider larvae can survive until becoming adult but only about one-third of aggressive spider larvae can survive. It was confirmed that the survival probability of the larvae will change depending on the difference in the character of the growing spider.
The reason why aggressive spider larvae have a lower probability of survival is that aggressive spiders tend to eat larvae. Submissive spiders sometimes eat larvae, but aggressive spiders are more likely to take action to eat larvae.
The research team says, "Differences in behaviors due to personality may be caused by differences in the neural systems of the two," while saying, "The character of individuals, not the character of animals and insects, It can also be said that the difference brings about changes in behavioral characteristics. " The ecology of the spider that was confirmed this time may be applicable not only to the kind that adults raise larvae but also to spiders of a kind that some gather together and coexist. As with ants and bees, spiders of several species gathering together are considered to be "given a specialized role by physical factors when becoming adults", but this time the discovery will be in the future There is a possibility that there is a possibility to greatly change the research policy.