Question

В цепи питания переход энергии с первого трофического уровня на второй составляет 12 %, а со второго на третий — 7 %. Рассчитайте прирост биомассы (кг) на третьем трофическом уровне, если на первом запасено 4x106 кДж энергии. В 1 кг биомассы на третьем уровне содер¬жится 80 кДж энергии.

Answer 1

В цепи питания переход энергии с первого трофического уровня на второй составляет 12 %, а со второго на третий — 7 %. Рассчитайте прирост биомассы (кг) натретьем трофическом уровне, если на первом запасено 4x106 кДж энерги

Answer 2

Calculating Biomass Growth at the Third Trophic Level

To calculate the biomass growth at the third trophic level, we can use the given energy values and the transfer efficiencies between trophic levels.

Given: - Energy stored at the first trophic level = 4x10^6 kJ - Energy transfer efficiency from the first to the second trophic level = 12% - Energy transfer efficiency from the second to the third trophic level = 7% - Energy content per unit biomass at the third trophic level = 80 kJ/kg

Calculation Steps:

1. Calculate the energy available at the second trophic level. 2. Calculate the energy transferred to the third trophic level. 3. Convert the energy to biomass at the third trophic level.

Step 1: Calculate the Energy Available at the Second Trophic Level

The energy available at the second trophic level can be calculated using the energy transfer efficiency from the first to the second trophic level.

Energy available at the second trophic level = Energy at the first trophic level * (Energy transfer efficiency from the first to the second trophic level) Energy available at the second trophic level = 4x10^6 kJ * (12/100) = 480,000 kJ

Step 2: Calculate the Energy Transferred to the Third Trophic Level

The energy transferred to the third trophic level can be calculated using the energy transfer efficiency from the second to the third trophic level.

Energy transferred to the third trophic level = Energy available at the second trophic level * (Energy transfer efficiency from the second to the third trophic level) Energy transferred to the third trophic level = 480,000 kJ * (7/100) = 33,600 kJ

Step 3: Convert the Energy to Biomass at the Third Trophic Level

To convert the energy to biomass at the third trophic level, we can use the given energy content per unit biomass at the third trophic level.

Biomass growth at the third trophic level = Energy transferred to the third trophic level / Energy content per unit biomass at the third trophic level Biomass growth at the third trophic level = 33,600 kJ / 80 kJ/kg = 420 kg

The biomass growth at the third trophic level is 420 kg.