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| The size of an individual organism is a key trait to characterize its physiology
and feeding ecology. Size-based scaling laws may have a limited size range of
validity or undergo a transition from one scaling exponent to another at some
characteristic size. We collate and review data on size-based scaling laws for
resource acquisition, mobility, sensory range, and progeny size for all pelagic
marine life, from bacteria to whales. Further, we review and develop simple
theoretical arguments for observed scaling laws and the characteristic sizes
of a change or breakdown of power laws. We divide life in the ocean into
seven major realms based on trophic strategy, physiology, and life history
strategy. Such a categorization represents a move away from a taxonomically
oriented description toward a trait-based description of life in the oceans.
Finally, we discuss life forms that transgress the simple size-based rules and
identify unanswered questions. | |
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