Nonadaptive radiations are a subset of evolutionary radiations (or species flocks) that are characterized by diversification that is not driven by resource partitioning.[1][2][3][4] The species that are a part of a nonadaptive radiation will tend to have very similar niches, and in many (though not all) cases will be morphologically similar.[4] Nonadaptive radiations are driven by nonecological speciation.[2][4] In many cases, this nonecological speciation is allopatric, and the organisms are dispersal-limited such that populations can be geographically isolated within a landscape with relatively similar ecological conditions.[4] For example, Albinaria land snails on islands in the Mediterranean[1] and Batrachoseps salamanders from California[2] each include relatively dispersal-limited, and closely related, ecologically similar species often have minimal range overlap, a pattern consistent with allopatric, nonecological speciation. In other cases, such as certain damselflies[3] and crickets from Hawaii,[5] there can be range overlap in closely related species, and it is likely that sexual selection (and species recognition) plays a role in maintaining (and perhaps giving rise to) species boundaries.[4]

See also


  1. ^ a b Gittenberger, E. (1991-08-01). "What about non-adaptive radiation?". Biological Journal of the Linnean Society. 43 (4): 263–272. doi:10.1111/j.1095-8312.1991.tb00598.x. ISSN 0024-4066.
  2. ^ a b c Rundell, Rebecca J.; Price, Trevor D. (2009-07-01). "Adaptive radiation, nonadaptive radiation, ecological speciation and nonecological speciation". Trends in Ecology & Evolution. 24 (7): 394–399. doi:10.1016/j.tree.2009.02.007. ISSN 0169-5347. PMID 19409647.
  3. ^ a b Wellenreuther, Maren; Sánchez-Guillén, Rosa Ana (2016). "Nonadaptive radiation in damselflies". Evolutionary Applications. 9 (1): 103–118. Bibcode:2016EvApp...9..103W. doi:10.1111/eva.12269. ISSN 1752-4571. PMC 4780385. PMID 27087842.
  4. ^ a b c d e Czekanski-Moir, Jesse E.; Rundell, Rebecca J. (2019-05-01). "The Ecology of Nonecological Speciation and Nonadaptive Radiations" (PDF). Trends in Ecology & Evolution. 34 (5): 400–415. doi:10.1016/j.tree.2019.01.012. ISSN 0169-5347. PMID 30824193. S2CID 73494468.
  5. ^ Xu, Mingzi; Shaw, Kerry L. (2020-02-05). "Spatial Mixing between Calling Males of Two Closely Related, Sympatric Crickets Suggests Beneficial Heterospecific Interactions in a NonAdaptive Radiation". Journal of Heredity. 111 (1): 84–91. doi:10.1093/jhered/esz062. ISSN 0022-1503. PMID 31782960.