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Twenty years of research of spotted hyenas: Mamánci are better off

Twenty years of research of spotted hyenas: Mamánci are better off On cared mamánky we have a tendency zahlížet as minor and for starting a family particularly reliable male. As it turns twenty years of fieldwork Berlin zoologist, is not always true.

Young male hyenas polecats, opting instead to stay with a family pack of than to go for reproduction in the world can ultimately fare no worse, rather the contrary. Supporting mothers provide them with better social status and better access to food and females, writes AlphaGalileo .

Zoologists from the Berlin Leibniz Institute IZW spent watching the eight clans of spotted hyenas living in Tanzania's Ngorongoro Crater, a full twenty years. During this time, the venerable collected demographic data on more than 250 males. They focused on the same time as one another's behavior and survival of male hyenas, as well as a detailed description of the physical condition of individuals and the resulting reproductive success. All this information then have utilized in the search for answers to the question whether the situation varies considerably successful males who decide to leave the clan and seek happiness neighbors from those who remain "with moms."

In most mammals, we see two types of males: those who prefer to keep to familiar home territory (ie. Filopatrie) and those who managed to seek a partner for reproduction and new territory elsewhere. The first mentioned category then often unflattering among people considered "mamánky" or "outdated goods consumption." But at least hyenas example, the reproductive success of both types of male indistinguishable. Moreover, it seems that the only thing that affects the decisions of young males stay home or go to the world, is the current amount of available young females with whom they could mate.

Smečkových population of animals in nature are composed of a variable number of males and females and the ratio between the representation of both sexes will vary depending on a number of environmental factors. From this natural lottery but still suggests that where they are born male, a female will be less. Therefore, it is likely that the young male out into the world rather than waiting for the right home. Similarly behaves as most male hyenas in Ngorongoro, when it leaves the native clan and tries her luck in one of seven others.

Those who decide to hold but a mother's skirts, but on that has nothing to lose. Indeed hyenas live in a sophisticated matriarchal system, which also young females themselves can significantly affect male rivalry. "The mother while providing substantial support to their sons the sense that it gives them a higher social status," says Eve Davidianová, a zoologist from the IZW. "Mamánci" then have privileged access to food, allowing them to spend more time courting females. And not ledajakým: mainly those who have a higher social status.

Ultimately, the so domesticated hyenas wait the first male offspring earlier than the one that went into the world. The system, according to which the female hyenas select suitable male for mating is very complex. "Generally, females prefer males who were born or join the group when they were in the world," says Davidianová. "This simple mechanism naturally prevents relational mating. "the male who wants to push through without help mothers must seek such a clan, where more females.


Author: Radomír Dohnal
Source: Ekolist.cz



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