Snake clover frog, grasshopper are part of the food chain. Which representative in this chain is a third-order consumer? How much energy is transferred to the third order consumer level if the net annual primary production of the ecosystem is 10,000 kJ?
1) the consumer of the III order in this food chain is a snake;
2) 10 kJ goes to the level of consumers of the third order.
To answer the first question, it is necessary to establish the correct order of the links in the food chain: the producer of this chain is a clover, a consumer of the first order is a grasshopper, a consumer of the second order is a frog, and a consumer of the third order is a snake.
According to Lindemann’s rule, no more than 10% of the energy comes from each previous trophic level to the next. Using this rule, we calculate the amount of energy (in kJ), which goes to the level of consumers of the third order with a net annual primary production of the ecosystem of 10,000 kJ. Producer – 10,000 kJ.
10,000 kJ will move to the level of consumers of the first order: 10 = 1000 kJ.
To the level of consumers of the II order – 1000 kJ: 10 = 100 kJ. To the level of consumers of the III order – 100 kJ: 10 = 10 kJ.
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