@article {2612,
	title = {Climate variability and cultural eutrophication at Walden Pond (Massachusetts, USA) during the last 1800 years},
	journal = {PLOS ONE},
	volume = {131786944304936355638925103443261363251824210727417625108525645371825392233490545519069849653235772249},
	year = {2018},
	month = {Apr-04-2018},
	pages = {e0191755},
	abstract = {Recent shifts in the ecological condition of Walden Pond, MA, are of
potentially wide interest due to the lake{\textquoteright}s importance as a cultural,
historical, and recreational resource in addition to its scientific
value as an indicator of local and global environmental change. Algal
microfossils in six sediment cores document changes in hydroclimate and
trophic status of the lake during the last 1800 years and extend two
previous sediment core records of shorter length. Low percentages of
planktonic diatoms in the longest cores (WAL-3, WAL-15) indicate
shallowing and/or greater water clarity associated with a relatively
arid interval during the Medieval Climate Anomaly, ca. A.D. 1150-1300,
Cultural eutrophication of the lake since the A.D. 1920s caused diatoms
in the genera Asterionella and Synedra to increase in relative abundance
at the expense of Cyclotella, Discostella, and the chrysophyte alga
Mallomonas allorgel. Percentages of Asterionella and Synedra have
remained fairly stable since A.D. 2000 when a previous sediment core
study was conducted, but scaled chrysophytes have become more numerous.
These findings suggest that, although mitigation efforts have curtailed
anthropogenic nutrient inputs to Walden Pond, the lake has not returned
to the pre-impact condition described by Henry David Thoreau and may
become increasingly vulnerable to further changes in water quality in a
warmer and possibly wetter future.},
	keywords = {BOREAL LAKES, canada, CRAWFORD LAKE, DEPTH MODELS, ENVIRONMENTAL-CHANGE, ice-age, new-england, NORTH-AMERICA, NORTHEASTERN UNITED-STATES, organic-matter},
	doi = {10.1371/journal.pone.0191755},
	url = {https://www.sciencedaily.com/releases/2018/04/180404143418.htm},
	author = {Stager, J. Curt and Wiltse, Brendan and Hubeny, J. Bradford and Yankowsky, Eric and Nardelli, David and Primack, Richard},
	editor = {Doi, Hideyuki}
}
@article {2209,
	title = {Deglaciation of the northwestern White Mountains, New Hampshire},
	journal = {Geographie Physique Et Quaternaire},
	volume = {53},
	year = {1999},
	note = {218kbTimes Cited:18
Cited References Count:56
},
	month = {1999},
	pages = {59-77},
	abstract = {The mode of deglaciation in the northwestern White Mountains of New Hampshire has been controversial since the mid 1800{\textquoteright}s. Early workers believed that active ice deposited the Bethlehem Moraine complex in the Ammonoosuc River basin during recession of the last ice sheet. In the 1930{\textquoteright}s this deglaciation model was replaced by the concept of widespread simultaneous stagnation and downwastage of Late Wisconsinan ice. The present authors reexamined the Bethlehem Moraine complex and support the original interpretation of a series of moraines deposited by active ice. We found other moraine clusters of similar age to the northeast in the Johns River and lsrael River basins. lce-marginal deposits that probably correlate with the Bethlehem Moraine also occur west of Littleton. The Bethlehem Moraine complex and equivalent deposits in adjacent areas were formed by readvance and oscillatory retreat of the Connecticut Valley lobe of the Laurentide Ice Sheet. This event is called the Littleton-Bethlehem Readvance. Throughout the study area, sequences of glaciolacustrine deposits and meltwater drainage channels indicate progressive northward recession of the glacier margin. Radiocarbon dates from nearby New England and Quebec suggest that the ice sheet withdrew from this part of the White Mountains between about 12,500 and 12,000 (14)C yr BP. We attribute the Littleton-Bethlehem Readvance to a brief climatic cooling during Older Dyas time, close to 12,000 BP.},
	keywords = {canada, chronology, climate, last termination, new-england, record, tills},
	isbn = {0705-7199},
	author = {Thompson, W. B. and Fowler, B. K. and Dorion, C. C.}
}
