Tell me what experiments with speciation ever did that.
By Chris Stassen
ere is a short list of referenced speciation events. I picked four relatively well-known examples, from about a dozen that I had documented in materials that I have around my home. These are all common knowledge, and by no means do they encompass all or most of the available examples.
Example one:
Two strains of
Drosophila paulistorum developed hybrid sterility of male offspring between 1958 and 1963. Artificial selection induced strong intra-strain mating preferences.
(Test for speciation: sterile offspring and lack of interbreeding affinity.)
Dobzhansky, Th., and O. Pavlovsky, 1971. "An experimentally created incipient species of Drosophila",
Nature 23:289-292.
Example two:
Evidence that a species of fireweed formed by doubling of the chromosome count, from the original stock. (Note that polyploids are generally considered to be a separate "race" of the same species as the original stock, but they do meet the criteria which you suggested.)
(Test for speciation: cannot produce offspring with the original stock.)
Mosquin, T., 1967. "Evidence for autopolyploidy in
Epilobium angustifolium (Onaagraceae)",
Evolution 21:713-719
Example three:
Rapid speciation of the Faeroe Island house mouse, which occurred in less than 250 years after man brought the creature to the island.
(Test for speciation in this case is based on morphology. It is unlikely that forced breeding experiments have been performed with the parent stock.)
Stanley, S., 1979.
Macroevolution: Pattern and Process, San Francisco, W.H. Freeman and Company. p. 41
Example four:
Formation of five new species of cichlid fishes which formed since they were isolated less than 4000 years ago from the parent stock, Lake Nagubago.
(Test for speciation in this case is by morphology and lack of natural interbreeding. These fish have complex mating rituals and different coloration. While it might be possible that different species are inter-fertile, they cannot be convinced to mate.)
Mayr, E., 1970.
Populations, Species, and Evolution, Massachusetts, Harvard University Press. p. 348
By James Meritt
Someone writes:
I have a friend who says since we have never seen a species actually split into two different species during recorded history that he has trouble believing in the theory of evolution. Is this bogus and have humans seen animals bred into different species? (The various highly bred english dogs come to mind but I suppose this would be easier to find in vegetation. Corn, wheat strains? Donkeys and mules? )This is bogus. We've seen it happen naturally
without our tampering with the process. From the FAQ:
"Three species of wildflowers called goatsbeards were introduced to the United States from Europe shortly after the turn of the century. Within a few decades their populations expanded and began to encounter one another in the American West. Whenever mixed populations occurred, the specied interbred (hybridizing) producing sterile hybrid offspring. Suddenly, in the late forties two new species of goatsbeard appeared near Pullman, Washington. Although the new species were similar in appearance to the hybrids, they produced fertile offspring. The evolutionary process had created a separate species that could reproduce but not mate with the goatsbeard plants from which it had evolved."
The article is on page 22 of the February, 1989 issue of
Scientific American. It's called "A Breed Apart." It tells about studies conducted on a fruit fly,
Rhagoletis pomonella, that is a parasite of the hawthorn tree and its fruit, which is commonly called the thorn apple. About 150 years ago, some of these flies began infesting apple trees, as well. The flies feed and breed on either apples or thorn apples, but not both. There's enough evidence to convince the scientific investigators that they're witnessing speciation in action. Note that some of the investigators set out to prove that speciation was not happening; the evidence convinced them otherwise.
By Anneliese Lilje
Just a smattering of a
huge database of articles (1991 only):
- Bullini, L and Nascetti, G, 1991, Speciation by Hybridization in phasmids and other insects, Canadian Journal of Zoology, Volume 68(8), pages 1747-1760.
- Ramadevon, S and Deaken, M.A.B., 1991, The Gibbons speciation mechanism, Journal of Theoretical Biology, Volume 145(4) pages 447-456.
- Sharman, G.B., Close, R.L, Maynes, G.M., 1991, Chromosome evolution, phylogeny, and speciation of rock wallabies, Australian Journal of Zoology, Volume 37(2-4), pages 351-363.
- Werth, C. R., and Windham, M.D., 1991, A model for divergent, allopatric, speciation of polyploid pteridophytes resulting from silencing of duplicate- gene expression, AM-Natural, Volume 137(4):515-526.
- Spooner, D.M., Sytsma, K.J., Smith, J., A Molecular reexamination of diploid hybrid speciation of Solanum raphanifolium, Evolution, Volume 45, Number 3, pages 757-764.
- Arnold, M.L., Buckner, C.M., Robinson, J.J., 1991, Pollen-mediated introgression and hybrid speciation in Louisiana Irises, P-NAS-US, Volume 88, Number 4, pages 1398-1402.
- Nevo, E., 1991, Evolutionary Theory and process of active speciation and adaptive radiation in subterranean mole rats, spalax-ehrenbergi superspecies, in Israel, Evolutionary Biology, Volume 25, pages 1-125.
... on and on to about #50 if you like...
There are about 100 each for every year before 1991 to 1987 in my database.
By L. Drew Davis
A List of Speciation References
- Weiberg, James R.. Starczak, Victoria R.. Jorg, Daniele. Evidence for rapid speciation following a founder event in the laboratory. Evolution. V46. P1214(7) August, 1992.
- Kluger, Jeffrey. Go fish. (rapid fish speciation in African lakes). Discover. V13. P18(1) March, 1992.
- Hauffe, Heidi C.. Searle, Jeremy B.. A disappearing speciation event? (response to J.A. Coyne, Nature, vol. 355, p. 511, 1992). Nature. V357. P26(1) May 7, 1992.
Abstract: Analysis of contact between two chromosomal races of house mice in northern Italy show that natural selection will produce alleles that bar interracial matings if the resulting offspring are unfit hybrids. This is an important exception to the general rule that intermixing races will not tend to become separate species because the constant sharing of genes minimizes the genetic diversity requisite for speciation.
- Barrowclough, George F.. Speciation and Geographic Variation in Black-tailed Gnatcatchers. (book reviews) The Condor. V94. P555(2) May, 1992.
- Rabe, Eric W.. Haufler, Christopher H.. Incipient polyploid speciation in the maidenhair fern (Adiantum pedatum; Adiantaceae)? The American Journal of Botany. V79. P701(7) June, 1992.
- Nores, Manuel. Bird speciation in subtropical South America in relation to forest expansion and retraction. The Auk. V109. P346(12) April, 1992.
Abstract:
The climatic and geographic history of the Pleistocene and Holocene periods modified the distribution of the bird population in the South American forests. Forest birds are found dispersed in the Yungas and Paranese areas with only minimal infiltration of the Chaco woodland, indicating an atmospheric change during the interglacial periods. In the Chaco lowlands, the interactions between non-forest birds reveal the existence of presence of a forest belt along the Bermejo and Pilcomayo rivers.
- Kondrashov, Alexey S.. Jablonka, Eva. Lamb, Marion J.. Species and speciation. (response to J.A. Coyne, Nature, vol. 355, p. 511, 1992). Nature. V356. P752(1) April 30, 1992.
Abstract: J.A. Coyne wrongly asserted that neodarwinism includes allopatric evolution but not sympatric evolution. Allopatric evolution occurs among geographically isolated populations, whereas sympatric evolution occurs within one species' entire population. Both are neodarwinian since each results from natural selection of genetic variation. Also, Coyne failed to recognize that the molecular models used to illustrate how genetic changes bring on speciation are most useful when researchers acknowledge that both inherited epigenetic and genetic changes affect speciation.
- Spooner, David M.. Sytsma, Kenneth J.. Smith, James F.. A molecular reexamination of diploid hybrid speciation of Solanum raphanifolium. Evolution. V45. P757(8) May, 1991.
- Orr, H. Allen. Is single-gene speciation possible?. Evolution. V45. P764(6) May, 1991.
- Miller, Julie Ann. Pathogens and speciation. (Research Update). BioScience. V40. P714(1) Nov, 1990.
- Barton, N.H. Hewitt, G.M. Adaptation, speciation and hybrid zones; many species are divided into a mosaic of genetically distinct populations, separated by narrow zones of hybridization. Studies of hybrid zones allow us to quantify the genetic differences responsible for speciation, to measure the diffusion of genes between diverging taxa, and to understand the spread of alternative adaptations. (includes related information) Nature. V341. P497(7) Oct 12, 1989.
- Wright, Karen. A breed apart; finicky flies lend credence to a theory of speciation. Scientific American. V260. P22(2) Feb, 1989.
- Coyne, Jerry A. Orr, H. Allen. Patterns of speciation in Drosophila. Evolution. V43. P362(20) March, 1989.
- Feder, Jeffrey L. Bush, Guy L. A field test of differential host-plant usage between two sibling species of Rhagoletis pomonella fruit flies (Diptera: Tephritidae) and its consequences for sympatric models of speciation. Evolution. V43. P1813(7) Dec, 1989.
- Soltis, Douglas E. Soltis, Pamela S. Allopolyploid speciation in Tragopogon: insights from chloroplast DNA. The American Journal of Botany. V76. P1119(6) August, 1989.
- Coyne, J.A. Barton, N.H. What do we know about speciation?. Nature. V331. P485(2) Feb 11, 1988.
- Barton, N.H. Jones, J.S. Mallet, J. No barriers to speciation. (morphological evolution). Nature. V336. P13(2) Nov 3, 1988.
- Kaneshiro, Kenneth Y. Speciation in the Hawaiian drosophila: sexual selection appears to play an important role. BioScience. V38. P258(6) April, 1988