Body shape shifting during growth permits tests that distinguish between competing geometric theories of metabolic scaling.

Abstract:

:Metabolism fuels all of life's activities, from biochemical reactions to ecological interactions. According to two intensely debated theories, body size affects metabolism via geometrical influences on the transport of resources and wastes. However, these theories differ crucially in whether the size dependence of metabolism is derived from material transport across external surfaces, or through internal resource-transport networks. We show that when body shape changes during growth, these models make opposing predictions. These models are tested using pelagic invertebrates, because these animals exhibit highly variable intraspecific scaling relationships for metabolic rate and body shape. Metabolic scaling slopes of diverse integument-breathing species were significantly positively correlated with degree of body flattening or elongation during ontogeny, as expected from surface area theory, but contradicting the negative correlations predicted by resource-transport network models. This finding explains strong deviations from predictions of widely adopted theory, and underpins a new explanation for mass-invariant metabolic scaling during ontogeny in animals and plants.

journal_name

Ecol Lett

journal_title

Ecology letters

authors

Hirst AG,Glazier DS,Atkinson D

doi

10.1111/ele.12334

subject

Has Abstract

pub_date

2014-10-01 00:00:00

pages

1274-81

issue

10

eissn

1461-023X

issn

1461-0248

journal_volume

17

pub_type

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