What are the two population regulations?
Bottom-up regulation and top-down regulation. Bottom-up regulation is where a plant-eating species, or a primary consumer, consumes too much of the primary PRODUCER, and the population decreases. The secondary consumer will have less of the primary consumer, and its population will also decrease. Top-down regulation is where the population of a lower trophic level increases, then the higher trophic level increases, becaus they have more food, which makes the lower level decrease, and with less food, the higher level decreases as well.