TY - JOUR
T1 - Single and multigenerational responses of body mass to atmospheric oxygen concentrations in Drosophila melanogaster
T2 - Evidence for roles of plasticity and evolution
AU - Klok, C. J.
AU - Hubb, A. J.
AU - Harrison, Jon
N1 - Copyright:
Copyright 2010 Elsevier B.V., All rights reserved.
PY - 2009/12
Y1 - 2009/12
N2 - Greater oxygen availability has been hypothesized to be important in allowing the evolution of larger invertebrates during the Earth's history, and across aquatic environments. We tested for evolutionary and developmental responses of adult body size of Drosophila melanogaster to hypoxia and hyperoxia. Individually reared flies were smaller in hypoxia, but hyperoxia had no effect. In each of three oxygen treatments (hypoxia, normoxia or hyperoxia) we reared three replicate lines of flies for seven generations, followed by four generations in normoxia. In hypoxia, responses were due primarily to developmental plasticity, as average body size fell in one generation and returned to control values after one to two generations of normoxia. In hyperoxia, flies evolved larger body sizes. Maximal fly mass was reached during the first generation of return from hyperoxia to normoxia. Our results suggest that higher oxygen levels could cause invertebrate species to evolve larger average sizes, rather than simply permitting evolution of giant species.
AB - Greater oxygen availability has been hypothesized to be important in allowing the evolution of larger invertebrates during the Earth's history, and across aquatic environments. We tested for evolutionary and developmental responses of adult body size of Drosophila melanogaster to hypoxia and hyperoxia. Individually reared flies were smaller in hypoxia, but hyperoxia had no effect. In each of three oxygen treatments (hypoxia, normoxia or hyperoxia) we reared three replicate lines of flies for seven generations, followed by four generations in normoxia. In hypoxia, responses were due primarily to developmental plasticity, as average body size fell in one generation and returned to control values after one to two generations of normoxia. In hyperoxia, flies evolved larger body sizes. Maximal fly mass was reached during the first generation of return from hyperoxia to normoxia. Our results suggest that higher oxygen levels could cause invertebrate species to evolve larger average sizes, rather than simply permitting evolution of giant species.
KW - Body size
KW - Hyperoxia
KW - Hypoxia
KW - Laboratory natural selection
KW - Phenotypic plasticity
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U2 - 10.1111/j.1420-9101.2009.01866.x
DO - 10.1111/j.1420-9101.2009.01866.x
M3 - Article
C2 - 19878502
AN - SCOPUS:72449200582
SN - 1010-061X
VL - 22
SP - 2496
EP - 2504
JO - Journal of Evolutionary Biology
JF - Journal of Evolutionary Biology
IS - 12
ER -