Ryan Lokteff's research while affiliated with Utah State University and other places
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Publications (8)
Riparia surrounding low-order streams are dynamic environments that often support distinct biodiversity. Because of their connection to nearby uplands, riparian vegetation communities at these streams respond to many environmental filters—climatic, physical, chemical or biotic factors—that restrict what species can occur at a given location from wi...
Riparian vegetation may recover quickly from disturbance when the disturbance vector is removed or reduced. Grazing is a disturbance that removes plant biomass through herbivory, while overgrazing is a more severe disturbance that can deplete plant propagule pools and inhibit plant community recovery. We tested the hypothesis that riparian vegetati...
Dams created by North American beavers Castor canadensis (hereafter, “beavers”) have numerous effects on stream habitat use by trout. Many of these changes to the stream are seen as positive, and many stream restoration projects seek either to reintroduce beavers or to mimic the habitat that they create. The extent to which beaver dams act as movem...
Archer, E.K., N. Hough-Snee*, A. Van Wagenen, R. Lokteff, B.B. Roper. 2012. The PACFISH/INFISH Biological Opinion (PIBO) Effectiveness Monitoring Program and Invasive Plant Species Detection: A Retrospective Summary 2003-2011. USDA Forest Service, Logan, UT. 26pp.
The Logan River and its tributaries in northern Utah sustain a
significant population of the imperiled Bonneville cutthroat trout
(Oncorhynchus clarki Utah) as well as invasive brown trout (Salmo
trutta). In general, the upper reaches of the system are populated by
cutthroat trout and the lower reaches by brown trout. Spawn Creek is a
unique tribut...
The Logan River and its tributaries in northern Utah are among the last remaining habitats that support a significant population of the imperiled Bonneville cutthroat trout (BCT - Oncorhynchus clarki Utah). Efforts to protect and study the physical and biologic needs of BCT in the Logan River watershed include invasive species removal, habitat rest...
Availability of Bonneville cutthroat trout (BCT - Oncorhynchus clarki Utah) habitat continues to decline in the Great Basin due to a lack of stream connectivity, over allocation of water resources, and detrimental land use practices. The Logan River and its tributaries in northern Utah are one of the last remaining systems supporting a significant...
Citations
... Similarly, valley settings, the river planform and sediment and flow regime patterns can help in identifying the theoretical species composition and structure of vegetation patches along river segments, and can also inform about riparian dynamism. Sediment size, channel geometry and flood/drought disturbance regime at the reach scale can be theoretically used to infer local riparian vegetation features based on functional zones, spatial distribution of pioneer species, age structure or location and dimensions of dominant riparian guilds (Bejarano et al., 2012;Gurnell et al., 2016b;Hough-Snee et al., 2015b). Some modelling approaches are currently under development and may assist in predicting the potential vegetation that can be expected (Ochs et al., 2020). ...
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... reversibility of the osmoregulatory preparations for SW entry, as exhibited in the postsmolt life-stage in salmonids, may be adaptive. For instance, it would be adaptive to reverse preparations for marine life if a migratory fish seasonally loses access to the sea due to reasons either zoogenic (e.g., damming) or environmental (e.g., drought) or a combination of the two (Kemp et al. 2012;Lokteff et al. 2013;Malison et al. 2014). It has been shown that over evolutionary time, populations of anadromous salmonids landlocked by anthropogenic damming have adapted to lessen their osmoregulatory preparations for marine life (McCormick et al. 2019). ...
... We applied a Spearman correlation method with a Bray-Curtis similarity index to the assemblage presence-absence data. We used the Mantel test with 999 permutations to determine whether the results were significant [48,49]. Significance was set at p < 0.05 in all analyses. ...
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... To facilitate model validation, actual dam counts were collected using a combination of on-the-ground surveys (e.g. Lokteff et al., 2013), aerial overflights (e.g. , and virtual reconnaissance in Google Earth. For the Fremont, Logan-Little Bear, Strawberry, and Price watersheds, we conducted detailed dam count censuses using Google Earth to navigate up and down every stream in the drainage network at an altitude of roughly 500-600 m above ground. ...
