The term for the efficiency of energy transfer between trophic levels is known as trophic efficiency. This concept measures the amount of energy that is passed from one trophic level to the next, typically expressed as a percentage. As energy transfers from producers to primary consumers and onwards, significant losses occur primarily due to metabolic processes, respiration, and heat dissipation. Generally, only about 10% of energy is transferred between levels, highlighting the importance of primary producers in sustaining energy flow within food webs and ecosystems.