Through thick and thin: Cryptic sympatric speciation in the submersed genus Najas (Hydrocharitaceae)

Les, Donald H.; Peredo, Elena L.; King, Ursula M.; Benoit, Lori K.; Tippery, Nicholas P.; Ball, Cassandra J.; Shannon, Robynn K.

doi:10.1016/j.ympev.2014.09.022

Cited by 22 publications

(26 citation statements)

References 73 publications

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“…Fossils document the presence of Najas flexilis in central Alaska some 9300 years ago (Les et al 2015;Robinson et al 2007). Yet until fairly recently, the current North American range of N. flexilis was thought to extend only to northern Alberta, Canada (Haynes 2000;Porsild and Cody 1980).…”

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“…Recently, Les et al (2015) demonstrated that Najas flexilis sensu lato actually comprises two cryptic, sympatric species, which are divergent genetically and differ subtly by quantitative seed traits. Their sympatric occurrence across North America (they often grow together in the same water body) has long masked their identities as distinct species, which consist of a broader-seeded diploid (N. flexilis) and its thinner-seeded allotetraploid derivative (N. canadensis Michx.…”

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confidence: 99%

“…Their sympatric occurrence across North America (they often grow together in the same water body) has long masked their identities as distinct species, which consist of a broader-seeded diploid (N. flexilis) and its thinner-seeded allotetraploid derivative (N. canadensis Michx. ; Les et al 2015). It is virtually impossible to distinguish from floristic accounts, whether one, the other, or both species occur(s) within an area, unless a photograph or an accurate illustration of the seed is provided for measurement.…”

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“…It is virtually impossible to distinguish from floristic accounts, whether one, the other, or both species occur(s) within an area, unless a photograph or an accurate illustration of the seed is provided for measurement. Thus, although "N. flexilis" had been reported from Alaska, it was essential to confirm the identity of that material by DNA analysis to determine whether one or both of the cryptic species occurred there (Les et al 2015).…”

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“…The resolution of which of the cryptic Najas species occur(s) in Alaska is phytogeographically important because Canada and the lower 48 United States contain both Najas canadensis and N. flexilis, whereas the Old World is inhabited only by N. canadensis (Les et al 2015). Old World populations of N. canadensis extended (at least historically) from northwestern Europe to southern Siberia (Backman 1948;Casper and Krausch 1980), and it is conceivable that the species 2015] Les et al-Najas flexilis in Alaska 355 could have migrated into North America via a trans-Beringian dispersal route.…”

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Najas Flexilis(Hydrocharitaceae) in Alaska: A Reassessment

Les

King

et al. 2015

Rhodora

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ABSTRACT. Fifteen Najas flexilis collections were made in Alaska during the summer of 2012, with 13 of the stations representing either new or formerly undocumented localities for this imperiled Alaskan species. These field collections characterize the Alaskan habitats of N. flexilis as shallow water sites (,1.5 m) with sand-dominated substrates (71% of sites) and have documented an additional 28 species associates (a 300% increase). However, the additional collections have not extended the elevational, latitudinal, or longitudinal extent of N. flexilis from the limits indicated by previous Alaskan collections. Najas flexilis remains rare in Alaska as evidenced by a low specimen recovery rate (10%) from potentially suitable sites, and a total of only 12 geographically distinct localities known across the entire state. The new collections have furnished valuable study material for morphological and genetic analyses, which have confirmed the identity of Alaskan populations as N. flexilis, rather than N. canadensis, a recently identified, cryptic, allotetraploid derivative. A synthesis of information indicates that N. flexilis is indigenous to Alaska, where it originated via past (versus recent) migrations from other North American rather than Old World populations.

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