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2015 ; 282
(1819
): ä Nephropedia Template TP
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Testing mechanistic models of growth in insects
#MMPMID26609084
Maino JL
; Kearney MR
Proc Biol Sci
2015[Nov]; 282
(1819
): ä PMID26609084
show ga
Insects are typified by their small size, large numbers, impressive reproductive
output and rapid growth. However, insect growth is not simply rapid; rather,
insects follow a qualitatively distinct trajectory to many other animals. Here we
present a mechanistic growth model for insects and show that increasing specific
assimilation during the growth phase can explain the near-exponential growth
trajectory of insects. The presented model is tested against growth data on 50
insects, and compared against other mechanistic growth models. Unlike the other
mechanistic models, our growth model predicts energy reserves per biomass to
increase with age, which implies a higher production efficiency and energy
density of biomass in later instars. These predictions are tested against data
compiled from the literature whereby it is confirmed that insects increase their
production efficiency (by 24 percentage points) and energy density (by 4 J
mg(-1)) between hatching and the attainment of full size. The model suggests that
insects achieve greater production efficiencies and enhanced growth rates by
increasing specific assimilation and increasing energy reserves per biomass,
which are less costly to maintain than structural biomass. Our findings
illustrate how the explanatory and predictive power of mechanistic growth models
comes from their grounding in underlying biological processes.