Definitions help – plastic growth rate?

Definitions help – plastic growth rate?

This section of the textbook talks about population regulation and is describing the self-thinning rule / -4/3 boundary rule and states that “animals with plastic growth rates, such as fish, can respond to population density by changing growth rates and body size” (Krebs 2008 p. 204).

Context and common sense make me think it has something to do with either being changing or unchanging but I couldn’t find a definition anywhere in the book or in internet searches, does anybody here have a good definition of plastic growth rates? Are aplastic growth rates a thing?

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