roles of Neogene geology and late Pleistocene lake levels in shaping the genetic structure of the Lahontan redside shiner Richardsonius egregius (Teleostei: Cyprinidae)

Shifting drainage patterns in western North America, shaped by geological activity and changing global climates, have influenced the evolution of many aquatic taxa. We investigated the role of late Pleistocene high stands in pluvial Lake Lahontan on the genetic structure of Richardsonius egregius, a...

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Bibliographic Details
Published in:Biological journal of the Linnean Society 2011-09, Vol.104 (1), p.163-176
Main Authors: HOUSTON, DEREK D, SHIOZAWA, DENNIS K, RIDDLE, BRETT R
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Biological and medical sciences
Biological evolution
Cyprinidae
cytochrome b
drainage
evolution
Fresh water ecosystems
Freshwater
Fundamental and applied biological sciences. Psychology
gene flow
genes
genetic variation
Genetics of eukaryotes. Biological and molecular evolution
Great Basin
immigration
lakes
minnows
molecular clock
phylogeography
Richardsonius egregius
Synecology
Teleostei
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Summary:Shifting drainage patterns in western North America, shaped by geological activity and changing global climates, have influenced the evolution of many aquatic taxa. We investigated the role of late Pleistocene high stands in pluvial Lake Lahontan on the genetic structure of Richardsonius egregius, a minnow endemic to the Lahontan Basin of the western Great Basin. We used the mitochondrial cytochrome b gene to generate a phylogeny and assess intraspecific genetic diversity, to estimate divergence times between clades, and to evaluate whether gene flow currently occurs. The results obtained show that R. egregius exhibits genetic divergence between eastern and western Lahontan Basin populations. Divergence time estimates show that intraspecific genetic diversification began in the Pliocene or early Pleistocene, before the pluvial lake high stands associated with the last glacial maximum. These results imply that the fluctuating water levels in pluvial Lake Lahontan had a minimal effect on shaping the genetic architecture of R. egregius. Coalescent analyses using the immigration with migration model show that contemporary gene flow between eastern and western Lahontan Basin populations does not occur. © 2011 The Linnean Society of London, Biological Journal of the Linnean Society, 2011, 104, 163–176.
ISSN:0024-4066
1095-8312
DOI:10.1111/j.1095-8312.2011.01723.x