Phylogenetic inertia

Phylogenetic inertia or phylogenetic constraint refers to the limitations on the future evolutionary pathways that have been imposed by previous adaptations.[1]

Charles Darwin first recognized this phenomenon, though the term was later coined by Huber in 1939.[2] Darwin explained the idea of phylogenetic inertia based on his observations; he spoke about it when explaining the "Law of Conditions of Existence".[3] Darwin also suggested that, after speciation, the organisms do not start over from scratch, but have characteristics that are built upon already existing ones that were inherited from their ancestors; and these characteristics likely limit the amount of evolution seen in that new taxa.[4] This is the main concept of phylogenetic inertia.

Richard Dawkins also explained these constraints by likening natural selection to a river in his 1982 book The Extended Phenotype.[5]

Examples of phylogenetic inertia

Body plan

Modes of reproduction

Birds are the only speciose group of vertebrates that are exclusively oviparous. It has been suggested that birds are phylogenetically constrained, as being derived from reptiles, and likely have not overcome this constraint or diverged far enough away to develop viviparity.[8][9]

Homologous structures

Homologous bone structure in forelimbs of four vertebrates.

Tests for phylogenetic inertia in study systems

There have been several studies that have been able to effectively test for phylogenetic inertia when looking into shared traits; predominantly with a comparative methods approach.[11][12][13] Some have used comparative methods and found evidence for certain traits attributed to adaptation, and some to phylogeny; there were also numerous traits that could be attributed to both.[12] Another study developed a new method of comparative examination that showed to be a powerful predictor of phylogenetic inertia in a variety of situations. It was called Phylogenetic Eigenvector Regression (PVR), which runs principal component analyses between species on a pairwise phylogenetic distance matrix.[11] In another, different study, the authors described methods for measuring phylogenetic inertia, looked at effectiveness of various comparative methods, and found that different methods can reveal different aspects of drivers. Autoregression and PVR showed good results with morphological traits.[13]

References

  1. Johnson, K; McKinney, F; Sorenson, M (1999). "Phylogenetic constraint on male parental care in the dabbling ducks.". Proceedings of the Royal Society of London B (266): 759–763.
  2. Huber, B (1939). "Siebrohrensystem unserer Baume und seine jahreszeitlichen Veranderungen.". Jahrbücher für Wissenschaftliche Botanik. 88: 176–242.
  3. 1 2 Darwin, Charles (1859). On the Origin of Species. p. 206.
  4. 1 2 Shanahan, Timothy (2011). "Phylogenetic Inertia and Darwin's Higher Law". Studies in History and Philosophy of Biological and Biomedical Sciences.
  5. Dawkins, Richard (1982). The Extended Phenotype: The Gene as a Unit of Selection. Oxford University Press. p. 42.
  6. Lewin, Roger (1980). "Evolutionary Theory Under Fire". Science.
  7. Gould, S. J.; Lewontin, R. C. (1979-09-21). "The Spandrels of San Marco and the Panglossian Paradigm: A Critique of the Adaptationist Programme". Proceedings of the Royal Society of London B: Biological Sciences. 205 (1161): 581–598. doi:10.1098/rspb.1979.0086. ISSN 0962-8452. PMID 42062.
  8. McKitrick, Mary (1993). "Phylogenetic Constraint in Evolutionary Theory: Has it any Explanatory Power?". Annual Review of Ecology, Evolution, and Systematics.
  9. Blackburn, Daniel; Evans, Howard (1986). "Why are there no Viviparous Birds?". The American Naturalist. 128 (2).
  10. Dawkins, Richard (1986). The Blind Watchmaker. ISBN 0-393-31570-3.
  11. 1 2 Diniz-Filho, Jose Alexandre Felizola; Sant'Ana, Carlos Eduardo Ramos de; Bini, Luis Mauricio (1998-01-01). "An Eigenvector Method for Estimating Phylogenetic Inertia". Evolution. 52 (5): 1247–1262. doi:10.2307/2411294. JSTOR 2411294.
  12. 1 2 Pienaar, Jason; Ilany, Amiyaal; Geffen, Eli; Yom-Tov, Yoram (2013-05-01). "Macroevolution of life-history traits in passerine birds: adaptation and phylogenetic inertia". Ecology Letters. 16 (5): 571–576. doi:10.1111/ele.12077. ISSN 1461-0248.
  13. 1 2 Morales, Eduardo (2000-04-01). "Estimating Phylogenetic Inertia in Tithonia (asteraceae): A Comparative Approach". Evolution. 54 (2): 475–484. doi:10.1111/j.0014-3820.2000.tb00050.x. ISSN 1558-5646.
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