Question

what is shelford's law of tolerance​

Answer 1

Explanation:

Shelford's law of tolerance is a principle developed by American zoologist Victor Ernest Shelford in 1931. It states that an organism's success is based on a complex set of conditions and that each organism has a certain minimum, maximum, and optimum environmental factor or combination of factors that determine success.[1] The further elaboration on the theory of tolerance is credited to Ronald Good.

Answer 2

Answer:

1. Points out the second limitation of Liebig's law of the minimum - that factors act in concert rather than in isolation. A low level of one factor can sometimes be partially compensated for by appropriate levels of other factors.

• A corollary to this is that two factors may work synergistically (e.g. 1 + 1 = 5), to make a habitat favorable or unfavorable.

2. Geographic distribution of sugar maple.

• It cannot tolerate average monthly high temperatures above 24–27 °C or winter temperatures below −18 °C. The western limit is determined by dryness, and this coincides with the western limits of forest vegetation in general.

• Because temperature and rainfall interact to determine the availability of water, sugar maple tolerates lower annual precipitation at the edge of its northern range (by about 50 cm).