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17 results for “northern Rocky Mountains”
Linked collectors and determiners for: A Contribution To The Knowledge Of Sweltsa Exquisita (Frison) And S. Occidens (Frison) And Description Of A New Species Of Sweltsa From The Northern Rocky Mountains, U. S. A. (Plecoptera: Chloroperlidae).
Natural history specimen data linked to collectors and determiners held within, "A Contribution To The Knowledge Of Sweltsa Exquisita (Frison) And S. Occidens (Frison) And Description Of A New Species Of Sweltsa From The Northern Rocky Mountains, U. S. A. (Plecoptera: Chloroperlidae)". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/6f2b8c70-3a9b-4723-aad7-6f30ae75e6c4">https://bionomia.net/dataset/6f2b8c70-3a9b-4723-aad7-6f30ae75e6c4</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/6f2b8c70-3a9b-4723-aad7-6f30ae75e6c4">https://gbif.org/dataset/6f2b8c70-3a9b-4723-aad7-6f30ae75e6c4</a>. Formatted as a Frictionless Data package.
Data and code for: Wildfire activity in northern Rocky Mountain subalpine forests still within millennial-scale range of variability
<p>Increasing area burned across western North America raises questions about the precedence and magnitude of changes in fire activity, relative to the historical range of variability (HRV) that ecosystems experienced over recent centuries and millennia. Paleoecological records of past fire occurrence provide context for contemporary changes in ecosystems characterized by infrequent, high-severity fire regimes. Here we present a network of 12 fire-history records derived from macroscopic charcoal preserved in sediments of small subalpine lakes within a c. 10,000 km<sup>2</sup> landscape in the U.S. northern Rocky Mountains (Northern Rockies). We used this network to characterize landscape-scale burning over the past 2500 yr and evaluate the precedence of widespread regional burning experienced in the early 20<sup>th</sup> and 21<sup>st </sup>centuries. We further compare the Northern Rockies fire history to a previously published network of fire-history records in the Southern Rockies. In Northern Rockies subalpine forests, widespread fire activity was strongly linked to seasonal climate conditions, in contemporary, historical, and paleo records. The average estimated fire rotation period (FRP) over the past 2500 years was 164 yr (HRV: 127-225 yr), while the contemporary FRP from 1900-2021 CE was 215 yr. Thus, extensive regional burning in the early 20<sup>th</sup> century (e.g., 1910 CE) and in recent decades was within the HRV of recent millennia. Results from the Northern Rockies contrast with the Southern Rockies, which burned with less frequency on average over the past 2500 yr, and where 21<sup>st</sup>-century burning has exceeded the HRV. Our results support expectations that Northern Rockies fire activity will continue to increase with climatic warming, surpassing historical burning if more than one exceptional fire year akin to 1910 occurs within the next several decades. The societal and ecological consequences of climatic warming in subalpine forests will depend, in large part, on the magnitude of fire-regime changes relative to the past.</p>
Data and code for: Wildfire activity in northern Rocky Mountain subalpine forests still within millennial-scale range of variability
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Conifer seedling demography reveals mechanisms of initial forest resilience to wildfires in the northern Rocky Mountains
<p>Climate warming and an increased frequency and severity of wildfires are expected to transform forest ecosystems, in part through altered post-fire vegetation trajectories. Such a loss of forest resilience to wildfires arises due to a failure to pass through one or more critical demographic stages, or "filters," including seed availability, germination, establishment, and survival. Here we quantify the relative influence of microclimate and microsite conditions on key stages of post-fire seedling demography in two large, lightning-ignited wildfires from the regionally extensive fire season of 2017 in the northern Rocky Mountains, U.S.A. We tracked conifer seedling density, survival, and growth in the first three years post-fire in 69 plots spanning gradients in fire severity, topography, and climate; all plots were limited to within 100 m of a seed source to assure seed availability. Microclimate conditions were inferred based on measurements in a subset of 46 plots. We found abundant post-fire conifer regeneration, with a median of 2,633 seedlings per hectare after three years, highlighting early resilience to wildfire. This robust regeneration was due in part to moderate post-fire climate conditions, supporting high survivorship (>50% on average) of all seedlings tracked over the study period (n = 763). A statistical model based on variables describing potential seed availability, microclimate, fire severity, understory vegetation, and soil nitrogen availability explained 75% of the variability in seedling density among plots. This analysis highlights the overarching importance of fine-scale heterogeneity in fire effects, which determine microclimate conditions and create diverse microsites for seedlings, ultimately facilitating post-fire tree regeneration. Our study elucidates mechanisms of forest resilience to wildfires and demonstrates the utility of a demographic perspective for anticipating forest responses to future wildfires under changing environmental conditions.</p>
Conifer seedling demography reveals mechanisms of initial forest resilience to wildfires in the northern Rocky Mountains
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Data from: Delisting the Northern Rocky Mountain Gray Wolf from the U.S. Endangered Species Act: An assessment of political discourse over 20 years
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FIGURE 25 in Five new species of Stauroneis (Bacillariophyta, Stauroneidaceae) from the northern Rocky Mountains, USA
FIGURE 25: Wolverine Lakes in the Galton Range, northwest Montana. Upper Wolverine Lake (foreground) is the type locality of Stauroneis thompsonii and typical of habitats for Stauroneis species in the northern Rocky Mountains. Photo by the author.
FIGURES 9–24 in Five new species of Stauroneis (Bacillariophyta, Stauroneidaceae) from the northern Rocky Mountains, USA
FIGURES 9–24: Stauroneis sacajaweae, S. spauldingiae, and S. thompsonii. Figs 9–15: Stauroneis sacajaweae. Figs 9, 11–15: Type locality. Fig. 10: Haystack Seep, Going-To-The-Sun Road, Glacier National Park, Montana. Figs 16–21: Stauroneis spauldingiae. Figs 16–18, 20, 21: Copper Lake, Shoshone County, Idaho (type locality). Fig. 19: Lily Lake, Lemhi County, Idaho. Figs 22–24: Stauroneis thompsonii from the type locality.
FIGURES 1–8 in Five new species of Stauroneis (Bacillariophyta, Stauroneidaceae) from the northern Rocky Mountains, USA
FIGURES 1–8: Stauroneis clarkii and Stauroneis lewisii. Figs 1–4: Stauroneis clarkii from the type locality. Figs 5–8: Stauroneis lewisii from various locations. Figs 5–6: Blodgett Lake, Selway-Bitterroot Wilderness, Montana (type locality). Fig. 7: Fred Burr Lake, Selway-Bitterroot Wilderness, Montana. Fig. 8: Bloody Dick Pond No. 6, Beaverhead County, Montana.
FIGURES 3–20 in Encyonema hamsherae, a new diatom species from the Northern Rocky Mountains, USA
FIGURES 3–20: Figures 3–16, Encyonema hamsherae sp. nov. Figures 17–20. Encyonema hebridicum. Figs 3 (holotype), 4, 7, 8, 10–13. Shovel Creek, Montana; Figs 5, 9. Castle Creek (Stillwater), Montana; Fig. 6. Tongue River, Wyoming; Figs 14–16. Trout Creek, Montana; Figs 17, 18. Kootenai Fen, Glacier National Park, Montana (MDC sample # 451707 (1), University of Montana Herbarium (MONTU) accession #39–85); Figs 19, 20. (isotype) Lulea Lappmark, Sweden (Cleve and Möller Nr. 37), Fig. 20 shows two focal planes of same valve. Scale bars are 10 µm unless otherwise noted.
FIGURE 2b in Encyonema hamsherae, a new diatom species from the Northern Rocky Mountains, USA
FIGURE 2b:Dorsal and ventral striae densities of these sample populations, range for E. hebridicum (Krammer, 1997) is illustrated by the line in the lower left of the graph.
FIGURE 2a in Encyonema hamsherae, a new diatom species from the Northern Rocky Mountains, USA
FIGURE 2a:Length and width measurements of different populations of E. hamsherae sp. nov. from Montana and Wyoming, the range for E. hebridicum given by Krammer (1997) is shown by the rounded box.
FIGURE 1 in Encyonema hamsherae, a new diatom species from the Northern Rocky Mountains, USA
FIGURE 1: Sites in Montana and Wyoming where Encyonema hamsherae has been recorded. Numbers for each site correspond to those in Table 1. Circle size is proportional to number of E. hamsherae valves recorded in an 800 valve count; please refer to Table 1 for abundance data for each site. Only those sites with associated physical and water chemistry data are listed in Table 2.
FIGURES 3–10 in Encyonema droseraphilum sp. nov. (Bacillariophyta) and other rare diatoms from undisturbed floating-mat fens in the northern Rocky Mountains, USA
FIGURES 3–10: Encyonema droseraphilum sp. nov. Figs 3–8: LM, size diminution series from the type locality. Fig. 4: Holotype specimen. Fig. 9: SEM, external valve view. Fig. 10: SEM, internal valve view. Arrows indicate dorsally bent (not curved) proximal
FIGURE 2 in Encyonema droseraphilum sp. nov. (Bacillariophyta) and other rare diatoms from undisturbed floating-mat fens in the northern Rocky Mountains, USA
FIGURE 2: Floating-mat fen with central pool (site 4525). Site 4526 is similar but lacks a central pool of open water. Photo by Loren Bahls.
FIGURE 1 in Encyonema droseraphilum sp. nov. (Bacillariophyta) and other rare diatoms from undisturbed floating-mat fens in the northern Rocky Mountains, USA
FIGURE 1: Location of Indian Meadows Research Natural Area in western Montana, USA. Inset: Site map showing relative positions of abandoned beaver pond (site 1241), floating-mat fen with central pool (site 4525), and floating-mat fen without central pool (site 4526).
Data from: Patterns of hybridization among cutthroat trout and rainbow trout in northern Rocky Mountain streams
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