Question

how does range of tolerance affect species? for any environmental factor, there is an upper limit and a lower limit that defines the conditions in which an organism can live. tolerance is the ability of any organism to survive when exposed to abiotic or biotic factors. the figure below shows a range of tolerance for steelhead trout. the limiting factor in this case is water temperature. trout can tolerate water temperatures between 9 °c and 25 °c. most trout live in the optimum zone, which is the temperature range that is best for trout survival. the zone of physiological stress lies between the optimum zone and the tolerance limits. fewer trout live in this zone. trout that do live in this zone experience physiological stress, such as the inability to grow.

take a look

1. explain what the curved line on the graph represents.

Explanation:

The curved line on the graph (related to trout's water temperature tolerance) likely represents the relationship between water temperature and a measure of trout survival/fitness (e.g., number of trout, growth rate). In the optimum zone (e.g., most trout live here), the curve is at a peak (highest survival/fitness). In the physiological stress zone (between optimum and tolerance limits), the curve declines as stress increases. Beyond upper/lower limits, the curve drops to zero (no survival). It shows how tolerance range (from lower to upper limit) defines where trout can live, with optimum having the best survival, stress zones having reduced survival, and outside limits no survival.

Answer:

The curved line likely represents how a trout - related measure (e.g., number of trout, growth, survival) changes with water temperature. It peaks in the optimum zone (best for survival), declines in the physiological stress zone (between optimum and tolerance limits, as stress from temperature increases), and drops to zero outside the upper/lower tolerance limits (where trout can’t survive). It illustrates the range of tolerance (from lower to upper limit) and how survival/fitness varies within that range, with the optimum zone having the highest survival/fitness, stress zones having reduced survival/fitness, and outside limits no survival.