# What area is able to feed a pair of owls weighing 1.5 kg each, of which 70% is water

What area is able to feed a pair of owls weighing 1.5 kg each, of which 70% is water, if the productivity of the biocenosis is 300 g of dry biomass from 1 m2 per year, if the food chain looks like this: cereal grain – rodents – owl

1) Find the dry weight of a pair of owls:

100% – 70% = 30% or 0.3.

1.5 * 0.3 = 0.45 kg – one owl,

0.9 kg – two owls.

2) To gain such a mass, owls need to eat 10 times more mice:

0.9 * 10 = 9 kg.

Mice, in turn, need to eat 9 * 10 = 90 kg of cereals.

3) The productivity of biocenosis is usually understood as the number of producers (cereals). Accordingly, to find the area, it is necessary to divide their mass by performance:

90,000 g / 300 g = 300 m ^ 2. Such an area is capable of feeding a couple of owls.

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