![]() ![]() Due to similarities between the lifestyles of contemporary hunter gatherers and those of our foraging ancestors, it is likely that strong seasonality limited population sizes throughout our species' past. The researchers then went back to look at the detailed ethnographic observations and found that although its significance had not been noticed, this finding was well supported by records of hunter-gatherers including the Ache in the tropical forest, the Hiwi in the savannah, and the Bushmen groups in the Kalahari Desert. And-just as in the modern world-it took much more land to produce the same amount of meat as plant-based food." "Wherever growing seasons were short, hunter gatherers required meat to make up a high percentage of their diets. "We were struck by the fact that-despite a long list of unknowns-a very strong result emerged from the model equations," says Galbraith. The team developed a mathematical model that simulated daily human foraging activities (gathering and hunting) and the resultant carbon (energy) flows between vegetation, animals, and hunter-gatherers in a realistic global environment. The hunting facilities include avieries, mangers, drinking troughs, rabbit hutches and a stone-built dovecote. Adjacent to the restaurant are a renovated studio apartment and a shed. Five further bedrooms and a bathroom to renovate are upstairs. "This led to a seasonal bottleneck in the amount of food available, which then set the overall limit on the population size, no matter how much food there was during the plentiful times." The ground floor comprises a 2-room apartment with a kitchen, two bedrooms and bathrooms. "Basically, if people had to live through long dry or cold seasons when plant food was scarce, in order to survive they had to depend on hunting a very limited number of animals," explains Galbraith, a professor in McGill's Department of Earth and Planetary Sciences and at the ICTA-UAB (Institut de Ciència i Tecnologia Ambientals of the Autonomous University of Barcelona), and a senior author on the paper published recently in the journal Nature Ecology & Evolution. In regions with short growing seasons, hunter-gatherer groups had smaller populations per square kilometer than groups who depended on abundant plant foods throughout the year. After looking at population size for the roughly 300 hunter-gatherer societies that existed until quite recently, the researchers found that many of these groups were much smaller than might have been expected from the local ecosystem productivity. ![]()
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