Girman, Derek J.http://hdl.handle.net/10211.1/15472024-03-28T20:50:50Z2024-03-28T20:50:50ZPopulation structure and genetic diversity of trout (Oncorhynchus mykiss) above and below natural and man-made barriers in the Russian River, CaliforniaDeiner, KristyGarza, John CarlosCoey, RobertGirman, Derek J.http://hdl.handle.net/10211.1/15502014-11-14T17:36:06Z2007-01-01T00:00:00ZPopulation structure and genetic diversity of trout (Oncorhynchus mykiss) above and below natural and man-made barriers in the Russian River, California
Deiner, Kristy; Garza, John Carlos; Coey, Robert; Girman, Derek J.
The effects of landscape features on gene
flow in threatened and endangered species play an
important role in influencing the genetic structure of
populations. We examined genetic variation of trout in
the species Oncorhynchus mykiss at 22 microsatellite
loci from 20 sites in the Russian River basin in central
California. We assessed relative patterns of genetic
structure and variation in fish from above and below
both natural (waterfalls) and man-made (dams) barriers.
Additionally, we compared sites sampled in the
Russian River with sites from 16 other coastal watersheds
in California. Genetic variation among the 20 sites
sampled within the Russian River was significantly
partitioned into six groups above natural barriers and
one group consisting of all below barrier and above dam
sites. Although the below-barrier sites showed moderate
gene flow, we found some support for sub-population
differentiation of individual tributaries in the watershed.
Genetic variation at all below-barrier sites was high
compared to above-barrier sites. Fish above dams were
similar to those from below-barrier sites and had similar
levels of genetic diversity, indicating they have not been
isolated very long from below-barrier populations.Population samples from above natural barriers were
highly divergent, with large Fst values, and had significantly
lower genetic diversity, indicating relatively small
population sizes. The origins of populations above natural
barriers could not be ascertained by comparing
microsatellite diversity to other California rivers.
Finally, below-barrier sites farther inland were more
genetically differentiated from other watersheds than
below-barrier sites nearer the river’s mouth.
The final publication is available at link.springer.com. Link to abstract: http://link.springer.com/article/10.1007/s10592-006-9183-0
2007-01-01T00:00:00ZMolecular systematics of basal subfamilies of ants using 28S rRNA (Hymenoptera: Formicidae)Ouellette, Gary D.Fisher, Brian L.Girman, Derek J.http://hdl.handle.net/10211.1/15492019-12-12T20:37:05Z2006-01-01T00:00:00ZMolecular systematics of basal subfamilies of ants using 28S rRNA (Hymenoptera: Formicidae)
Ouellette, Gary D.; Fisher, Brian L.; Girman, Derek J.
For many years, the ant subfamily Ponerinae was hypothesized to contain the basal (early branching) lineages of ants. Recently the
Ponerinae were reclassified into six poneromorph subfamilies based on morphological analysis. We evaluate this new poneromorph classification
using 1240 base pairs of DNA sequence data obtained from 28S rRNA gene sequences of 68 terminal taxa. The molecular tree
supported the monophyly of the ant family Formicidae, with 100% parsimony bootstrap (PB) support and posterior probabilities (PP) of
1.00, with the ant subfamily Leptanillinae as a sister group to all other ants (PBD62, PPD93). However, our analyses strongly support
the polyphyly of the Poneromorph subfamilies (sensu Bolton). The Ectatomminae and Heteroponerinae are more closely related to the
Formicoid subfamilies than to the rest of the poneromophs (PBD96, PPD100). The Amblyoponinae (PBD52, PPD96), Paraponerinae
(PBD100, PPD100), Ponerinae (PB<50, PPD71), and Proceratiinae (PBD98, PPD100) appear as distinct lineages at the base of the
tree and are identiWed as a poneroid grade. Monophyletic origins for the poneroid subfamilies Amblyoponinae, Paraponerinae, Ponerinae
and Proceratiinae are supported in our analysis. However, the genus Platythyrea forms a distinct sister group to the Ponerini within the
Ponerinae. The Heteroponerinae, based on our sample of Heteroponera, are associated with the subfamily Ectatomminae (PBD98,
PPD100). Furthermore, our data indicate the genus Probolomyrmex belongs to the Proceratiinae as suggested by recent morphological
analysis (PB 98, PP 100).
Published by and copyright of Elsevier. The definitive edition is available at http://www.journals.elsevier.com/molecular-phylogenetics-and-evolution/.
2006-01-01T00:00:00ZEffects of Holocene climate change on the historical demography of migrating sharp-shinned hawks ( Accipiter striatus velox ) in North AmericaHull, JoshuaGirman, Derek J.http://hdl.handle.net/10211.1/15482019-12-12T20:37:04Z2005-01-01T00:00:00ZEffects of Holocene climate change on the historical demography of migrating sharp-shinned hawks ( Accipiter striatus velox ) in North America
Hull, Joshua; Girman, Derek J.
DNA sequences of the mitochondrial control region were analysed from 298 individual sharpshinned
hawks (Accipiter striatus velox) sampled at 12 different migration study sites across
North America. The control region proved to be an appropriate genetic marker for identification
of continental-scale population genetic structure and for determining the historical
demography of population units. These data suggest that sharp-shinned hawks sampled at
migration sites in North America are divided into distinct eastern and western groups. The
eastern group appears to have recently expanded in response to the retreat of glacial ice at the
end of the last glacial maximum. The western group appears to have been strongly effected
by the Holocene Hypsithermal dry period, with molecular evidence indicating the most recent
expansion following this mid-Holocene climatic event 7000–5000 years before present.
The definitive version is available at www.blackwell-synergy.com.
2005-01-01T00:00:00Z