Deglaciation and Postglacial Vegetation History of the West Mountains, West-Central Idaho, U.S.A.

Doerner, James P.; Carrara, Paul E.

doi:10.2307/1552261

Cited by 11 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is broadly similar to paleoclimate histories inferred from other pollen records in the region. [ Doerner and Carrara , 1999] interpreted pollen in sediment cores 55–70 km southwest of Tailholt Mountain as implying conditions that were, relative to the present climate, warm and dry from 11.2 ka to 3.4 ka and cool and moist after 3.4 ka. [ Whitlock et al , 2011] interpreted pollen in a sediment core 125 km south‐southeast of Tailholt Mountain as a reflection of conditions that were, relative to present conditions, warmer and drier from 8.24 ka to 2.65 ka, with a transition to a climate supporting the modern forest composition by 2.65 ka.…”

Section: Chemical Erosion Rates Regolith Chemical Depletion and CLImentioning

confidence: 99%

Weak influences of climate and mineral supply rates on chemical erosion rates: Measurements along two altitudinal transects in the Idaho Batholith

2012

View full text Add to dashboard Cite

[1] Chemical weathering promotes regolith production, physical erosion, nutrient supply, and drawdown of atmospheric CO 2 . Although mineral dissolution rates show dependences on temperature and moisture in theoretical models and laboratory experiments, effects of climate on chemical erosion rates in nature remain uncertain, in part because variations in physical erosion rates and lithology can obscure climatic signals in chemical erosion rate measurements. Here we present new estimates of millennial-scale chemical and physical erosion rates along two altitudinal transects in the Idaho Batholith. Our measurements suggest that chemical erosion rates and the extent of regolith chemical alteration are insensitive to mean annual regolith temperature, even though the study sites span a wide range in temperatures (4.8 C-10.9 C). These data also suggest that rates of chemical erosion and the extent of regolith chemical alteration are weakly correlated with the annual duration of high regolith moisture conditions. Lastly, our measurements show that the sampled regoliths tend to grow more chemically weathered with increasing regolith residence time, implying that weathering at these sites is primarily limited by mineral dissolution kinetics rather than mineral supply rates to the regolith. The lack of strong control by mineral supply means that chemical erosion rates at these sites could potentially vary in response to climatic factors. Such climatically driven variation in chemical erosion rates is not obvious in our data, however. Instead, our measurements suggest that chemical erosion rates at these sites are insensitive to mean annual regolith temperature and only weakly dependent on the length of the wet season.

show abstract

Section: Chemical Erosion Rates Regolith Chemical Depletion and CLImentioning

confidence: 99%

Weak influences of climate and mineral supply rates on chemical erosion rates: Measurements along two altitudinal transects in the Idaho Batholith

2012

View full text Add to dashboard Cite

show abstract

“…A glacial maximum was reached between 17,000 and 14,000 yr bp (Thackray et al. , 2004); glaciers had receded from the region by c. 11,500 yr bp (Doerner & Carrara, 1999). Studies of plants, mammals, insects, fish, and crustaceans (Conroy & Cook, 2000; Althoff & Thompson, 2001; Arbogast et al.…”

Section: Introductionmentioning

confidence: 99%

Patterns of genetic differentiation in Thamnophis and Taricha from the Pacific Northwest

Ridenhour

Brodie

2006

Journal of Biogeography

View full text Add to dashboard Cite

Aim The co‐evolutionary interaction between the common garter snake, Thamnophis sirtalis, and the rough‐skinned newt, Taricha granulosa, takes place throughout much of the Pacific Northwest (North America). The biogeography of the Pacific Northwest has been heavily influenced by the last Pleistocene glaciation, which reached a maximum as late as 14,000 yr bp. We researched: (1) what type of population structure is present for garter snakes and newts, (2) whether the population structure of these species is consistent with a Pleistocene glaciation hypothesis, and (3) how population structure and migration possibly affect co‐evolution between these species. Location The Pacific Northwest of North America, specifically northern California, Oregon and Washington in the USA. Methods We sampled approximately 20 populations for each species from three different transects. Using microsatellite markers and tissue samples from both species, we quantified the population structure for both species. Individual‐based assignment tests were used to estimate contemporary migration rates. Results Both Th. sirtalis and Ta. granulosa exhibited little genetic differentiation among our study sites, even among those separated by large distances. Significant population structure was detected on multiple geographic scales. Differences in population structure were observed among transects and between garter snake and newt transects. Contemporary migration rate estimates indicate high levels of genetic exchange between populations. Main conclusions Prior to this study, little was known about the fine‐scale population structure of either species in this region. Patterns of population structure for garter snakes and newts reflect a shared biogeographical history affected by the Pleistocene glaciation in the Pacific Northwest. Both species apparently migrate frequently between populations, thus potentially retarding the process of adaptive co‐evolution. We find that populations from a northern coastal transect (Washington) are most likely to be locally adapted.

show abstract

Elevation‐dependent responses of streamflow to climate warming

Tennant

Crosby

Godsey

2014

Hydrological Processes

View full text Add to dashboard Cite

Abstract:Warming will affect snowline elevation, potentially altering the timing and magnitude of streamflow from mountain landscapes. Presently, the assessment of potential elevation-dependent responses is difficult because many gauged watersheds integrate drainage areas that are both snow and rain dominated. To predict the impact of snowline rise on streamflow, we mapped the current snowline (1980 m) for the Salmon River watershed (Idaho, USA) and projected its elevation after 3°C warming (2440 m). This increase results in a 40% reduction in snow-covered area during winter months. We expand this analysis by collecting streamflow records from a new, elevation-stratified gauging network of watersheds contained within high (2250-3800 m), mid (1500-2250 m) and low (300-1500 m) elevations that isolate snow, mixed and rain-dominated precipitation regimes. Results indicate that lags between percentiles of precipitation and streamflow are much shorter in low elevations than in mid-and high-elevation watersheds. Low elevation annual percentiles (Q 25 and Q 75 ) of streamflow occur 30-50 days earlier than in higher elevation watersheds. Extreme events in low elevations are dominated by low-and no-flow events whereas mid-and high-elevation extreme events are primarily large magnitude floods. Only mid-and high-elevation watersheds are strongly cross correlated with catchment-wide flow of the Salmon River, suggesting that changes in contributions from low-elevation catchments may be poorly represented using mainstem gauges. As snowline rises, mid-elevation watersheds will likely exhibit behaviours currently observed only at lower elevations. Streamflow monitoring networks designed for operational decision making or change detection may require modification to capture elevation-dependent responses of streamflow to warming.

show abstract

Deglaciation and Postglacial Vegetation History of the West Mountains, West-Central Idaho, U.S.A.

Cited by 11 publications

References 0 publications

Weak influences of climate and mineral supply rates on chemical erosion rates: Measurements along two altitudinal transects in the Idaho Batholith

Weak influences of climate and mineral supply rates on chemical erosion rates: Measurements along two altitudinal transects in the Idaho Batholith

Patterns of genetic differentiation in Thamnophis and Taricha from the Pacific Northwest

Elevation‐dependent responses of streamflow to climate warming

Contact Info

Product

Resources

About