Trait change of an organism in response to environmental variation
Phenotypic plasticity refers to some of the changes in an organism's behavior, morphology and physiology in response to a unique environment.[1][2] Fundamental to the way in which organisms cope with environmental variation, phenotypic plasticity encompasses all types of environmentally induced changes (e.g. morphological, physiological, behavioural, phenological) that may or may not be permanent throughout an individual's lifespan.[3]
The term was originally used to describe developmental effects on morphological characters, but is now more broadly used to describe all phenotypic responses to environmental change, such as acclimation (acclimatization), as well as learning.[3] The special case when differences in environment induce discrete phenotypes is termed polyphenism.
Phenotypic plasticity is the ability of one genotype to produce more than one phenotype when exposed to different environments. Each line here represents a genotype. Horizontal lines show that the phenotype is the same in different environments; slanted lines show that there are different phenotypes in different environments, and thus indicate plasticity.
Generally, phenotypic plasticity is more important for immobile organisms (e.g. plants) than mobile organisms (e.g. most animals), as mobile organisms can often move away from unfavourable environments.[4] Nevertheless, mobile organisms also have at least some degree of plasticity in at least some aspects of the phenotype.[2]
One mobile organism with substantial phenotypic plasticity is Acyrthosiphon pisum of the aphid family, which exhibits the ability to interchange between asexual and sexual reproduction, as well as growing wings between generations when plants become too populated.[5]
Water fleas (Daphnia magna) have shown both phenotypic plasticity and the ability to genetically evolve to deal with the heat stress of warmer, urban pond waters.[2]
^Price TD, Qvarnström A, Irwin DE (July 2003). "The role of phenotypic plasticity in driving genetic evolution". Proceedings. Biological Sciences. 270 (1523): 1433–40. doi:10.1098/rspb.2003.2372. PMC 1691402. PMID 12965006.
^ abcBender, Eric (21 March 2022). "Urban evolution: How species adapt to survive in cities". Knowable Magazine. Annual Reviews. doi:10.1146/knowable-031822-1. Retrieved 31 March 2022.
^ abKelly SA, Panhuis TM, Stoehr AM (2012). "Phenotypic Plasticity: Molecular Mechanisms and Adaptive Significance". Comprehensive Physiology. Vol. 2. pp. 1417–39. doi:10.1002/cphy.c110008. ISBN 978-0-470-65071-4. PMID 23798305.
^Schlichting CD (1986). "The Evolution of Phenotypic Plasticity in Plants". Annual Review of Ecology and Systematics. 17: 667–93. doi:10.1146/annurev.es.17.110186.003315.
^International Aphid Genomics Consortium (February 2010). Eisen JA (ed.). "Genome sequence of the pea aphid Acyrthosiphon pisum". PLOS Biology. 8 (2): e1000313. doi:10.1371/journal.pbio.1000313. PMC 2826372. PMID 20186266.
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