Biologists have long considered the origins and continued coexistence of the immense diversity of species found in our environment. How can we explain the fact that no single species predominates? A generally accepted hypothesis is that there are trade-offs, which means that no organism can do best in all conditions. One trade-off that is commonly assumed is that between gleaner organisms —which are able to acquire and consume more food than other species when resources are scarce—and exploiters, which rapidly consume large quantities of the same resources when they are in abundance.
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Source: Phys.org