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Animal species and evolution
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The article was published on 1963-01-01 and is currently open access. It has received 7870 citations till now. The article focuses on the topics: Species problem.read more
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Ecology and evolution of sympatric sticklebacks (Gasterosteus): evidence for a species-pair in Paxton Lake, Texada Island, British Columbia
TL;DR: In laboratory crosses, Paxton Lake benthic and limnetic sticklebacks breed true and this suggests that they represent separate gene pools rather than a foraging polymorphism.
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Adaptationism--how to carry out an exaptationist program.
TL;DR: The standards of evidence that could be used to identify adaptations and when and how they may be appropriately used are discussed and building an empirical case that certain features of a trait are best explained by exaptation, spandrel, or constraint requires demonstrating that the trait's features cannot be better accounted for by adaptationist hypotheses.
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Origin and evolution of insect wings and their relation to metamorphosis, as documented by the fossil record
TL;DR: All primitive Paleozoic pterygote nymphs are now known to have had articulated, freely movable wings reinforced by tubular veins, which suggests that the wings of early Pterygota were engaged in flapping movements, and that the immobilized, fixed, veinless wing pads of Recentnymphs have resulted from a later adaptation affecting only juveniles.
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Ecological genetics of a mosaic hybrid zone: mitochondrial, nuclear, and reproductive differentiation of crickets by soil type
TL;DR: There was little variation in morphological traits or in allozyme and mtDNA genotype frequencies among localities from within each of the four habitat types within the hybrid zone, however, there were very significant differences in each of these sets of markers.
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Genome sequencing reveals complex speciation in the Drosophila simulans clade
Daniel Garrigan,Sarah B. Kingan,Anthony J. Geneva,Peter Andolfatto,Andrew G. Clark,Kevin R. Thornton,Daven C. Presgraves +6 more
TL;DR: It is shown that gene flow has occurred throughout the genomes of the D. simulans clade species despite considerable geographic, ecological, and intrinsic reproductive isolation, and the relatively reduced efficacy of natural selection in D. sechellia is consistent with its derived, persistently reduced historical effective population size.