@article {2858,
	title = {Paleoenvironmental context for the Late Pleistocene appearance of Didymosphenia in a North American alpine lake},
	journal = {Aquatic Sciences},
	volume = {82},
	year = {2020},
	month = {Jan-01-2020},
	abstract = {The nuisance species Didymosphenia geminata is thought to have been spread by humans across North and South America and New Zealand. This diatom is of interest for its ability to form thick benthic mats in streams, altering ecosystem properties. Little is known, however, about its historic distribution and the parameters that are associated with its growth in absence of human influence. Although it is considered to be native to Arctic regions, its status at lower latitudes is uncertain. We measured the concentration of D. geminata cells in a sediment core from Beauty Lake, WY, a record that dates back to the Late Pleistocene. From approximately 11,233{\textendash}8750 years before present (ybp), a Didymosphenia maximum persisted, with peak concentrations of 3774{\textpm}20 valves/mg dry sediment (9985 ybp). The period corresponded to low flux of Al, Fe, and P within the sediments, supporting the importance of low P in controlling distribution. Furthermore, we demonstrate that D. geminata arrived in Beauty Lake shortly after deglaciation of the watershed. This species arrived without the aid of human introduction, implying an inherent ability for dispersal. We also examined the sediment record of nearby Yellowstone Lake, WY for the presence of D. geminata during the same time interval, but cells were not detected. The Yellowstone caldera is composed of rhyolite, a rock rich in silica (Si) and modest amounts of P. We conclude that both watersheds were exposed to the potential colonization by D. geminata, but just as the North Island of New Zealand has not been able to support this diatom because of P concentrations exceeding a threshold, the Yellowstone watershed is not able to support it either.},
	issn = {1015-1621},
	doi = {10.1007/s00027-019-0681-9},
	url = {http://link.springer.com/10.1007/s00027-019-0681-9},
	author = {Spaulding, Sarah A. and Stone, Jeffery R. and Norton, Stephen A. and Nurse, Andrea and Saros, Jasmine E.}
}
@article {2783,
	title = {Trends in catchment processes and lake evolution during the late-glacial and early- to mid-Holocene inferred from high-resolution XRF data in the Yellowstone region},
	journal = {Journal of Paleolimnology},
	volume = {58},
	year = {2017},
	month = {Jan-12-2017},
	pages = {551 - 569},
	abstract = {High-resolution records of geochemical data from four lakes in the Greater Yellowstone region were used to investigate watershed and lake history during the late-glacial and early-Holocene periods. Clastic input to regional lakes was high and variable during the early stages of lake development, when the surrounding landscape was geomorphically unstable and sparsely vegetated, and it decreased as vegetation gradually developed in each catchment. The decrease of clastic input was not regionally synchronous but occurred in a time-transgressive pattern from south to north. Long-term organic matter concentration and diatom production were inversely related to catchment erosion during the early stages of lake development and increased as temperatures warmed and in-lake nutrient concentrations increased. Similarly, calcite production usually was low following lake formation and increased over time, driven by climate change and its associated influences on lake-level, algal production, and lake thermal structure. Overall differences in the timing and pattern of geochemical change indicate that once the landscape had stabilized following deglaciation, changes in the geochemical character of the sediments were strongly influenced by local factors.},
	issn = {0921-2728},
	doi = {10.1007/s10933-017-9991-x},
	url = {http://link.springer.com/10.1007/s10933-017-9991-x},
	author = {Lu, Yanbin and Fritz, Sherilyn C. and Stone, Jeffery R. and Krause, Teresa R. and Whitlock, Cathy and Brown, Erik T. and Benes, James V.}
}
