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Abstract
Environmental effects on body size are of widespread ecological and economic importance
but our understanding of these effects has been obscured by an apparent paradox. Life
history analysis suggests that it is adaptive for adults to emerge smaller if reared
in conditions that slow down juvenile growth. However, whereas smaller adults emerge
if growth is limited by food availability, the reverse is usually observed if growth
is limited by temperature. The resolution of this apparent paradox may be that the
response of adult size to temperature is adaptive, but is constrained by a trade-off
that can be understood in terms of von Bertalanffy's classic theory of growth. Alternatively,
the response may be the unavoidable consequence of a fundamental relationship between
cell size and temperature.