Biology:Macroevolution

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Macroevolution comprises the evolutionary processes and patterns which occur at and above the species level.[1][2][3] In contrast, microevolution is evolution occurring within the population(s) of a single species. In other words, microevolution is the scale of evolution that is limited to intraspecific (within-species) variation, while macroevolution extends to interspecific (between-species) variation.[4] The evolution of new species (speciation) is an example of macroevolution. This is the common definition for 'macroevolution' used by contemporary scientists.[lower-alpha 1][lower-alpha 2][lower-alpha 3][lower-alpha 4][lower-alpha 5][lower-alpha 6][lower-alpha 7][lower-alpha 8][lower-alpha 9] However, the exact usage of the term has varied throughout history.[4][10][11]

Macroevolution addresses the evolution of species and higher taxonomic groups (genera, families, orders, etc) and uses evidence from phylogenetics,[5] the fossil record,[9] and molecular biology to answer how different taxonomic groups exhibit different species diversity and/or morphological disparity.[12]

Origin and changing meaning of the term

After Charles Darwin published his book On the Origin of Species[13] in 1859, evolution was widely accepted to be real phenomenon. However, many scientists still disagreed with Darwin that natural selection was the primary mechanism to explain evolution. Prior to the modern synthesis, during the period between the 1880s to the 1930s (dubbed the ‘Eclipse of Darwinism’) many scientists argued in favor of alternative explanations. These included ‘orthogenesis’, and among its proponents was the Russian entomologist Yuri A. Filipchenko.

Filipchenko appears to have been the one who coined the term ‘macroevolution’ in his book Variabilität und Variation (1927).[11] While introducing the concept, he claimed that the field of genetics is insufficient to explain “the origin of higher systematic units” above the species level.

Template:Text and translation

Filipchenko believed that the origin of families must require the sudden appearance of new traits which are different in greater magnitude compared to the characters required for the origin of a genus or species. However, this view is no longer consistent with contemporary understanding of evolution. Furthermore, the Linnaean ranks of ‘genus’ (and higher) are not real entities but arbitrary concepts.[14][10]

The term macroevolution was adopted by Filipchenko's protégé Theodosius Dobzhansky in his book ‘Genetics und the Origin of Species’ (1937) and in The Material Basis of Evolution (1940) by the geneticist Richard Goldschmidt, a close friend of Filipchenko.[15] Goldschmidt suggested saltational evolutionary changes[16][17] which found a moderate revival in the hopeful monster concept of evolutionary developmental biology (or evo-devo).[18][19] Occasionally such dramatic changes can lead to novel features that survive.

As an alternative to saltational evolution, Dobzhansky[20] suggested that the difference between macroevolution and microevolution reflects essentially a difference in time-scales, and that macroevolutionary changes were simply the sum of microevolutionary changes over geologic time. This view became broadly accepted in the middle of the last century but it has been challenged by a number of scientists who claim that microevolution is necessary but not sufficient to explain macroevolution. This is the decoupled view (see below).[3][2][4]

Microevolution vs Macroevolution

There has been considerable debate regarding the connection between microevolution and macroevolution.[1]

The ‘Extrapolation’ view holds that macroevolution is merely cumulative microevolution.

The ‘Decoupled’ view holds that there are separate macroevolutionary processes that cannot be sufficiently explained by microevolutionary processes alone.[3][21][22][5][23][24][15][10][25]

Within microevolution, the evolutionary process of changing heritable characteristics (e.g. changes in allele frequencies) is described by population genetics, with mechanisms such as mutation, natural selection, and genetic drift,[2] and speciation (e.g. sympatric and allopatric speciation), phyletic gradualism and punctuated equilibrium.[1] Macroevolution asks how higher taxonomic groups (genera, families, orders, etc) have evolved across geography and vast spans of geological time. Important questions and topics include:

Macroevolutionary processes

Speciation

According to the modern definition, the evolutionary transition from the ancestral to the daughter species is microevolutionary, because it results from selection (or, more generally, sorting) among varying organisms. However, speciation has also a macroevolutionary aspect, because it produces the interspecific variation species selection operates on.[4] Another macroevolutionary aspect of speciation is the rate at which it successfully occurs, analogous to reproductive success in microevolution.[2]

Speciation is the process in which populations within one species change to an extent at which they become reproductively isolated, that is, they cannot interbreed anymore. However, this classical concept has been challenged and more recently, a phylogenetic or evolutionary species concept has been adopted. Their main criteria for new species is to be diagnosable and monophyletic, that is, they form a clearly defined lineage.[27][28]

Charles Darwin first discovered that speciation can be extrapolated so that species not only evolve into new species, but also into new genera, families and other groups of animals. In other words, macroevolution is reducible to microevolution through selection of traits over long periods of time.[29] In addition, some scholars have argued that selection at the species level is important as well.[30] The advent of genome sequencing enabled the discovery of gradual genetic changes both during speciation but also across higher taxa. For instance, the evolution of humans from ancestral primates or other mammals can be traced to numerous but individual mutations.[31]

Evolution of new organs and tissues

One of the main questions in evolutionary biology is how new structures evolve, such as new organs. Macroevolution is often thought to require the evolution of structures that are 'completely new'. However, fundamentally novel structures are not necessary for dramatic evolutionary change. As can be seen in vertebrate evolution, most "new" organs are actually not new—they are simply modifications of previously existing organs. For instance, the evolution of mammal diversity in the past 100 million years has not required any major innovation.[32] All of this diversity can be explained by modification of existing organs, such as the evolution of elephant tusks from incisors. Other examples include wings (modified limbs), feathers (modified reptile scales),[33] lungs (modified swim bladders, e.g. found in fish),[34][35] or even the heart (a muscularized segment of a vein).[36]

The same concept applies to the evolution of "novel" tissues. Even fundamental tissues such as bone can evolve from combining existing proteins (collagen) with calcium phosphate (specifically, hydroxy-apatite). This probably happened when certain cells that make collagen also accumulated calcium phosphate to get a proto-bone cell.[37]

Examples

Evolutionary faunas

A macroevolutionary benchmark study is Sepkoski's[38][39] work on marine animal diversity through the Phanerozoic. His iconic diagram of the numbers of marine families from the Cambrian to the Recent illustrates the successive expansion and dwindling of three "evolutionary faunas" that were characterized by differences in origination rates and carrying capacities. Long-term ecological changes and major geological events are postulated to have played crucial roles in shaping these evolutionary faunas.[40]

Stanley's rule

Macroevolution is driven by differences between species in origination and extinction rates. Remarkably, these two factors are generally positively correlated: taxa that have typically high diversification rates also have high extinction rates. This observation has been described first by Steven Stanley, who attributed it to a variety of ecological factors.[41] Yet, a positive correlation of origination and extinction rates is also a prediction of the Red Queen hypothesis, which postulates that evolutionary progress (increase in fitness) of any given species causes a decrease in fitness of other species, ultimately driving to extinction those species that do not adapt rapidly enough.[42] High rates of origination must therefore correlate with high rates of extinction.[4] Stanley's rule, which applies to almost all taxa and geologic ages, is therefore an indication for a dominant role of biotic interactions in macroevolution.

Evolution of multicellularity

Main page: Biology:Multicellular organism

The evolution of multicellular organisms is one of the major breakthroughs in evolution. The first step of converting a unicellular organism into a metazoan (a multicellular organism) is to allow cells to attach to each other. This can be achieved by one or a few mutations. In fact, many bacteria form multicellular assemblies, e.g. cyanobacteria or myxobacteria. Another species of bacteria, Jeongeupia sacculi, form well-ordered sheets of cells, which ultimately develop into a bulbous structure.[43][44] Similarly, unicellular yeast cells can become multicellular by a single mutation in the ACE2 gene, which causes the cells to form a branched multicellular form.[45]

Evolution of bat wings

The wings of bats have the same structural elements (bones) as any other five-fingered mammal (see periodicity in limb development). However, the finger bones in bats are dramatically elongated, so the question is how these bones became so long. It has been shown that certain growth factors such as bone morphogenetic proteins (specifically Bmp2) is over expressed so that it stimulates an elongation of certain bones. Genetic changes in the bat genome identified the changes that lead to this phenotype and it has been recapitulated in mice: when specific bat DNA is inserted in the mouse genome, recapitulating these mutations, the bones of mice grow longer.[46]

Limb loss in lizards and snakes

Limbloss in lizards can be observed in the genus Lerista which shows many intermediary steps with increasing loss of digits and toes. The species shown here, Lerista cinerea, has no digits and only 1 toe left.

Snakes evolved from lizards. Phylogenetic analysis shows that snakes are actually nested within the phylogenetic tree of lizards, demonstrating that they have a common ancestor.[47] This split happened about 180 million years ago and several intermediary fossils are known to document the origin. In fact, limbs have been lost in numerous clades of reptiles, and there are cases of recent limb loss. For instance, the skink genus Lerista has lost limbs in multiple cases, with all possible intermediary steps, that is, there are species which have fully developed limbs, shorter limbs with 5, 4, 3, 2, 1 or no toes at all.[48]

Human evolution

While human evolution from their primate ancestors did not require massive morphological changes, our brain has sufficiently changed to allow human consciousness and intelligence. While the latter involves relatively minor morphological changes it did result in dramatic changes to brain function.[49] Thus, macroevolution does not have to be morphological, it can also be functional.

The study of human (brain) evolution benefits from the fact that human and ape genomes are available so that the genomes of our common ancestor can be reconstructed.[50] Even though the precise genetic mechanisms that shaped the human brain are not known, the mutations involved in human brain evolution are largely known, given that the genes expressed in the brain are relatively well understood.[51]

Evolution of viviparity in lizards

The European Common Lizard (Zootoca vivipara) consists of populations that are egg-laying or live-bearing, demonstrating that this dramatic difference can even evolve within a species.

Most lizards are egg-laying and thus need an environment that is warm enough to incubate their eggs. However, some species have evolved viviparity, that is, they give birth to live young, as almost all mammals do. In several clades of lizards, egg-laying (oviparous) species have evolved into live-bearing ones, apparently with very little genetic change. For instance, a European common lizard, Zootoca vivipara, is viviparous throughout most of its range, but oviparous in the extreme southwest portion.[52][53] That is, within a single species, a radical change in reproductive behavior has happened. Similar cases are known from South American lizards of the genus Liolaemus which have egg-laying species at lower altitudes, but closely related viviparous species at higher altitudes, suggesting that the switch from oviparous to viviparous reproduction does not require many genetic changes.[54]

Research topics

Subjects studied within macroevolution include:[55]

See also

Notes

  1. ↑ Rolland et al. (2023)[5] in the introduction describe ‘microevolution’ and ‘macroevolution’ occurring at two different scales; below the species level and at/above the species level respectively: “Since the modern synthesis, many evolutionary biologists have focused their attention on evolution at one of two different timescales: microevolution, that is, the evolution of populations below the species level (in fields such as population genetics, phylogeography and quantitative genetics), or macroevolution, that is, the evolution of species or higher taxonomic levels (for example, phylogenetics, palaeobiology and biogeography).”
  2. ↑ Saupe & Myers (2021)[1] states: “Macroevolution is the study of patterns and processes associated with evolutionary change at and above the species level, and includes investigations of both evolutionary tempo and mode.”
  3. ↑ Michael Hautmann (2019)[4] discusses 3 categories of definitions that have been historically used. He argues in favor of the following definition [added clarity]: "Macroevolution is evolutionary change that is guided by sorting of interspecific [between-species] variation."
  4. ↑ David Jablonski (2017)[6][7] states: “Macroevolution, defined broadly as evolution above the species level, is thriving as a field.”
  5. ↑ In his book “The Structure of Evolutionary Theory” (2002)[3] page 612, Stephen J. Gould describes the species as the basic unit of macroevolution, and compares speciation and extinction to birth and death in microevolutionary processes respectively: “In particular, and continuing to use species as a “type” example of individuality at higher levels, all evolutionary criteria apply to the species as a basic unit of macro-evolution. Species have children by branching (in our professional jargon, we even engender these offspring as “daughter species”). Speciation surely obeys principles of hereditary, for daughters, by strong constraints of homology, originate with phenotypes and genotypes closer to those of their parent than to any other species of a collateral lineage. Species certainly vary, for the defining property of reproductive isolation demands genetic differentiation from parents and collateral relatives. Finally, species interact with the environment in a causal way that can influence rates of birth (speciation) and death (extinction).”
  6. ↑ In his paper proposing the theory of species selection, Steven M. Stanly (1974)[2] described macroevolution as being evolution above the species level and decoupled from microevolution: “In reaction to the arguments of macromutationists who opposed Neo-Darwinism, modern evolutionists have forcefully asserted that the process of natural selection is responsible for both microevolution, or evolution within species, and evolution above the species level, which is also known as macroevolution or transpecific evolution. [...] Macroevolution is decoupled from microevolution, and we must envision the process governing its course as being analogous to natural selection but operating at a higher level of biological organization. In this higher-level process species become analogous to individuals, and speciation replaces reproduction”
  7. ↑ The ‘Understanding Evolution’ website[8] by UCMP: “Microevolution happens on a small scale (within a single population), while macroevolution happens on a scale that transcends the boundaries of a single species”
  8. ↑ Thomas Holtz’s course GEOL331 lecture notes[9] discusses macroevolution observed in the fossil record:“Following these early attempted modifications of Darwinism, the rest of the 20th Century onward stayed largely within a Darwinian model. However, there were different major schools of thought. Many of these differences hinged on views of microevolution (evolutionary change within a species) and macroevolution (evolutionary change above the species level). While most agreed that the ultimate processes in macroevolution were ultimately microevolutionary, there were disagreement[s] whether the patterns produced were actually reducible to microevolutionary changes.”
  9. ↑ The ‘Digital Atlas of Ancient Life’ website[10] by PRI provides a very detailed historical overview for the definition of ‘macroevolution’: “The meaning of the term “macroevolution” has shifted over time. Indeed, early definitions do to not necessarily make much sense in light of our current understanding of evolution, yet are still worth considering to show how the field itself has evolved. Here we will consider usage of the term macroevolution in a few key works, as well as present a definition of macroevolution that we endorse. [...] Lieberman and Eldredge (2014) defined macroevolution as “the patterns and processes pertaining to the birth, death, and persistence of species” and we adopt this definition here.”


References

  1. ↑ 1.0 1.1 1.2 1.3 Saupe, Erin E.; Myers, Corinne E. (April 1, 2021). "Macroevolution". in Nuño de la Rosa, Laura; Müller, Gerd B.. Chapter: Macroevolution, Book: Evolutionary Developmental Biology - A Reference Guide (1 ed.). Springer, Cham.. pp. 149–167. doi:10.1007/978-3-319-32979-6_126. ISBN 978-3-319-32979-6. https://doi.org/10.1007/978-3-319-32979-6_126. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Stanley, S. M. (1975-02-01). "A theory of evolution above the species level" (in en). Proceedings of the National Academy of Sciences 72 (2): 646–50. doi:10.1073/pnas.72.2.646. ISSN 0027-8424. PMID 1054846. Bibcode: 1975PNAS...72..646S. 
  3. ↑ 3.0 3.1 3.2 3.3 Gould, Stephen Jay (2002). The structure of evolutionary theory. Cambridge, Mass.: Belknap Press of Harvard University Press. ISBN 0-674-00613-5. OCLC 47869352. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Hautmann, Michael (2020). "What is macroevolution?" (in en). Palaeontology 63 (1): 1–11. doi:10.1111/pala.12465. ISSN 0031-0239. Bibcode: 2020Palgy..63....1H. 
  5. ↑ 5.0 5.1 5.2 5.3 Rolland, J.; Henao-Diaz, L.F.; Doebeli, M. et al. (July 10, 2023). "Conceptual and empirical bridges between micro- and macroevolution.". Nature Ecology & Evolution 7 (8): 1181–1193. doi:10.1038/s41559-023-02116-7. ISSN 2397-334X. PMID 37429904. Bibcode: 2023NatEE...7.1181R. https://files.zoology.ubc.ca/mank-lab/pdf/2023NEEGaps.pdf. 
  6. ↑ Jablonski, D. (June 3, 2017). "Approaches to Macroevolution: 1. General Concepts and Origin of Variation.". Springer, Evolutionary Biology 44 (4): 427–450. doi:10.1007/s11692-017-9420-0. PMID 29142333. Bibcode: 2017EvBio..44..427J. 
  7. ↑ Jablonski, D. (October 24, 2017). "Approaches to Macroevolution: 2. Sorting of Variation, Some Overarching Issues, and General Conclusions.". Springer, Evolutionary Biology 44 (4): 451–475. doi:10.1007/s11692-017-9434-7. PMID 29142334. Bibcode: 2017EvBio..44..451J. 
  8. ↑ "Evolution at different scales". UCMP, Berkely. https://evolution.berkeley.edu/evolution-at-different-scales-micro-to-macro/. 
  9. ↑ 9.0 9.1 9.2 "Macroevolution in the Fossil Record?". University of Maryland Department of Geology. https://www.geol.umd.edu/~tholtz/G331/lectures/331macroevo.html. 
  10. ↑ 10.0 10.1 10.2 10.3 "What is Macroevolution?". PRI. https://www.digitalatlasofancientlife.org/learn/evolution/macroevolution/. 
  11. ↑ 11.0 11.1 Filipchenko, J. (1927). Variabilität und Variation. Berlin: Borntraeger. 
  12. ↑ 12.0 12.1 Gregory, T.R. (June 25, 2008). "Evolutionary Trends". Evo Edu Outreach 1 (3): 259–273. doi:10.1007/s12052-008-0055-6. ISSN 1936-6434. 
  13. ↑ Darwin, C. (1859). On the origin of species by means of natural selection. London: John Murray. 
  14. ↑ Hendricks, Jonathan R.; Saupe, Erin E; Myers, Corinne E.; Hermsen, Elizabeth J.; Allmon, Warren D. (2014). "he generification of the fossil record.". Paleobiology 40 (4): 511–528. doi:10.1666/13076. 
  15. ↑ 15.0 15.1 Adams, Mark B (1990). "Filipchenko [Philiptschenko, Iurii Aleksandrovich."]. Dictionary of Scientific Biography 17 (297–303). https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/filipchenko-philiptschenko-iurii-aleksandrovich. 
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  17. ↑ Goldschmidt, R. (1940). The material basis of evolution. Yale University Press. 
  18. ↑ Theißen, Günter (March 2009). "Saltational evolution: hopeful monsters are here to stay" (in en). Theory in Biosciences 128 (1): 43–51. doi:10.1007/s12064-009-0058-z. ISSN 1431-7613. PMID 19224263. 
  19. ↑ Rieppel, Olivier (13 March 2017). Turtles as hopeful monsters : origins and evolution. Bloomington, Indiana. ISBN 978-0-253-02507-4. OCLC 962141060. 
  20. ↑ Dobzhanski, T. (1937). Genetics and the origin of species.. Columbia University Press. 
  21. ↑ Ayala Francisco J (1983). "Beyond Darwinism? The Challenge of Macroevolution to the Synthetic Theory of Evolution". PSA 1982. 2. Philosophy of Science Association. pp. 118–132. 
  22. ↑ Genetics, Paleontology, and Macroevolution 2nd edition. Cambridge, UK: Cambridge University Press. 2001. ISBN 0-521-80317-9. 
  23. ↑ Simons, Andrew M. (August 21, 2002). "The continuity of microevolution and macroevolution". Journal of Evolutionary Biology 15 (5): 688–701. doi:10.1046/j.1420-9101.2002.00437.x. 
  24. ↑ Erwin, Douglas H. (December 24, 2001). "Macroevolution is more than repeated rounds of microevolution". Evolution & Development 2 (2): 78–84. doi:10.1046/j.1525-142x.2000.00045.x. PMID 11258393. 
  25. ↑ Moran, Laurence A. (October 13, 2022). "Macroevolution". https://sandwalk.blogspot.com/2022/10/macroevolution.html. 
  26. ↑ Kin, Adrian; Błażejowski, Błażej (2014-10-02). "The Horseshoe Crab of the Genus Limulus: Living Fossil or Stabilomorph?" (in en). PLOS ONE 9 (10): e108036. doi:10.1371/journal.pone.0108036. ISSN 1932-6203. PMID 25275563. Bibcode: 2014PLoSO...9j8036K. 
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  28. ↑ Frost, Darrel R.; Hillis, David M. (1990). "Species in Concept and Practice: Herpetological Applications". Herpetologica 46 (1): 86–104. ISSN 0018-0831. https://www.jstor.org/stable/3892607. 
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  30. ↑ Grantham, T A (November 1995). "Hierarchical Approaches to Macroevolution: Recent Work on Species Selection and the "Effect Hypothesis"" (in en). Annual Review of Ecology and Systematics 26 (1): 301–321. doi:10.1146/annurev.es.26.110195.001505. ISSN 0066-4162. Bibcode: 1995AnRES..26..301G. 
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  52. ↑ Heulin, Benoît (1990-05-01). "Étude comparative de la membrane coquillère chez les souches ovipare et vivipare du lézard Lacerta vivipara" (in en). Canadian Journal of Zoology 68 (5): 1015–1019. doi:10.1139/z90-147. ISSN 0008-4301. Bibcode: 1990CaJZ...68.1015H. http://www.nrcresearchpress.com/doi/10.1139/z90-147. 
  53. ↑ Arrayago, Maria-Jesus; Bea, Antonio; Heulin, Benoit (1996). "Hybridization Experiment between Oviparous and Viviparous Strains of Lacerta vivipara: A New Insight into the Evolution of Viviparity in Reptiles". Herpetologica 52 (3): 333–342. ISSN 0018-0831. https://www.jstor.org/stable/3892653. 
  54. ↑ Ii, James A. Schulte; Macey, J. Robert; Espinoza, Robert E.; Larson, Allan (January 2000). "Phylogenetic relationships in the iguanid lizard genus Liolaemus: multiple origins of viviparous reproduction and evidence for recurring Andean vicariance and dispersal" (in en). Biological Journal of the Linnean Society 69 (1): 75–102. doi:10.1111/j.1095-8312.2000.tb01670.x. 
  55. ↑ Grinin, L., Markov, A. V., Korotayev, A. Aromorphoses in Biological and Social Evolution: Some General Rules for Biological and Social Forms of Macroevolution / Social evolution & History, vol.8, num. 2, 2009 [1]

Further reading



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