Practice question

Biotic potential is the maximum reproductive or population-growth capacity under ideal conditions, with limiting factors absent and the intrinsic rate expressed fully. Actual populations rarely realize it because food shortage, enemies, weather, and competition impose environmental resistance. Actual conditions would therefore describe realized growth, not biotic potential. Parameters have clear roles: N is current abundance, r is the maximum per-capita rate under the model, and K is the positive equilibrium set by environmental capacity. The term 1 - N/K supplies negative feedback. Checking limiting cases at N = 0, N = K, and N far below K is an efficient way to test an interpretation. The conclusion follows from tracking how density or age changes the rates experienced by individual organisms. Field evidence should therefore be compared with the model assumptions before extending the conclusion to every species, habitat, or time period. Interpreting the example at the appropriate population scale keeps the causal mechanism distinct from a simple correlation or an absolute rule.