Shelford's Law of Tolerance 谢尔福特耐性定律 Law of tolerance-the existence,abundance,and distribution of a species in an ecosystem are determined by whether the levels of one or more physical or chemical factors fall within the range tolerated by that species.Shelford Shelford’s Law of Tolerance of Tolerance 谢尔福特耐性定律 谢尔福特耐性定律 Law of tolerance-the existence, abundance, and distribution of a species in an ecosystem are determined by whether the levels of one or more physical or chemical factors fall within the range tolerated by that species