Tolerance is a classic concept of ecology that has been heavily employed in explaining and predicting species distribution in Earth ecosystems. Much of our current understanding of species distribution owes to the concept of single limiting factors (law of the minimum), but multiple environmental limitations co-occur in most Earth ecosystems and organisms performance is often limited by several environmental factors simultaneously. Current global climate change with unique blend of environmental stresses has led to explosive interest in the organism responses to multiple limitations and tolerance of multiple limitations. In this article, we review the classic concepts of environmental limitations, stress, and tolerance, and provide an overview of current understanding of tolerance to single and multiple environmental stresses and to simultaneous tolerance to several environmental factors (polytolerance). While the concepts of tolerance, stress, and environmental limitations are broad concepts of ecology, we have chosen the examples in this article from plant kingdom for consistency and also because, plants as sessile organisms are exposed to the widest spectrum of single and combined environmental stresses, and exhibit, thus, the richest range of responses to environmental variability.

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10 Ways To Fight Off Cancer

10 Ways To Fight Off Cancer

Learning About 10 Ways Fight Off Cancer Can Have Amazing Benefits For Your Life The Best Tips On How To Keep This Killer At Bay Discovering that you or a loved one has cancer can be utterly terrifying. All the same, once you comprehend the causes of cancer and learn how to reverse those causes, you or your loved one may have more than a fighting chance of beating out cancer.

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