Pollen counts and radiocarbon age determinations from 60 sites in eastern North America are used to determine the age of the mid-Holocene T.ugai canadensis decline, and to analyse the errors associated with such age estimation. The age is determined as 4750 14C yr BP with a standard error of the mean of about 50 years. Despite the quantity of data available, large uncertainties in the choice of age-depth model make it impossible to determine a more precise age for this event. It is likely that there are similar problems, or worse, with attempts to determine the age of other Holocene events. Within the limitations of the available data set, the Tsuga canadensis decline was synchronous across the whole of its range.
Allison, T.D. , Moeller, R.E. and Davis, MMB . 1986: Pollen in laminated sediments provides evidence for a mid-Holocene forest pathogen outbreak . Ecology67, 1101-1105 .
2.
Anderson, RS. 1979: A Holocene record of vegetation andfire at Upper South Branch Pond in northern Maine. PhD thesis, University of Maine, Orono.
3.
Anderson, R.S. , Davis, RB. , Miller, N.G. and Stuckenrath, R.1986: History of lateand post-glacial vegetation and disturbance around Upper South Branch Pond, northern Maine . Canadian Journal of Botany64, 1977-1986 .
4.
Baillie, M.G.L.1991: Marking in marker dates: towards an archaeology with historical precision . World Archaeology23, 233-243 .
5.
Bennett, K.D.1987: Holocene history of forest trees in southern Ontario . Canadian Journal of Botany65, 1792-1801 .
6.
Bennett, K.D.1994: Confidence intervals for age estimates and deposition times in late-Quaternary sediment sequences . The Holocene4, 337-348 .
7.
Bennett, K.D.2001: psimpoll. Uppsala University, Sweden: Quaternary geology program . Software available from http:flwww.kv.geo.uu.se.
8.
Boucherle, M.M. , Smol, J.P. , Oliver, T.C. , Brown, S.R. and McNeely, R.1986: Limnologic consequences of the decline in hemlock 4800 years ago in three southern Ontario lakes . Hydrobiologia143, 217-225 .
9.
Davis, M.B.1958: Three pollen diagrams from central Massachusetts . American Journal of Science256, 540-570 .
10.
Davis, M.B.1967: Pollen accumulation rates at Rogers Lake, Connecticut, during lateand post-glacial time . Review of Palaeobotany and Palynology2, 219-230 .
11.
Davis, M.B.1969: Climatic changes in southern Connecticut recorded by pollen deposition at Rogers Lake . Ecology50, 409-422 .
12.
Davis, M.B.1978: Climatic interpretation of pollen in Quaternary sediments. In Walker, D. and Guppy, J.C. , editors, Biology and Quaternary environments, Canberra: Australian Academy of Science , 35-51.
13.
Davis, M.B.1981: Outbreaks of forest pathogens in Quaternary history. In Bharadwaj, D.C. , Vishnu-Mittre , and Maheshwari, H.K. , editors, Fourth International Palynological Czonference Proceedings Volume III, Lucknow: Birbal Sahni Institute of Palaeobotany , 216-228.
14.
Davis, M.B. and Deevey, E.S.1964: Pollen accumulation rates: estimates from late-glacial sediment of Rogers Lake . Science145, 1293-1295 .
15.
Davis, M.B. , Spear, R.W. and Shane, L.C.K.1980: Holocene climate of New England . Quaternary Research14, 240-250 .
16.
Dunwiddie, P.W.1990: Postglacial vegetation history of coastal islands in southeastern New England . National Geographic Research6, 178-195 .
17.
Filion, L. and Quinty, F.1993: Macrofossil and tree-ring evidence for a long-term forest succession and mid-Holocene hemlock decline . Quaternary Research40, 89-97 .
18.
Foster, D.R. and Zebryk, T.M.1993: Long-term vegetation dynamics and disturbance history of a Tsuga-dominated forest in New England . Ecology74, 982-998 .
19.
Foster, D.R. , Zebryk, T. , Schoonmaker, P. and Lezberg, A.1992: Postsettlement history of human land-use and vegetation dynamics of a Tsuga canadensis (hemlock) woodlot in central New England . Journal of Ecology80, 773-786 .
20.
Fritz, P. , Morgan, A.V. , Eicher, U. and McAndrews, J.H.1987: Stable isotope, fossil Coleoptera and pollen stratigraphy in late Quaternary sediments from Ontario and New York State . Palaeogeography, Palaeoclimatology, Palaeoecology58, 183-202 .
21.
Fuller, J.L.1997: Holocene forest dynamics in southern Ontario, Canada: line-resolution pollen data . Canadian Journal of Botany75, 1714-1727 .
22.
Fuller, J.L.1998: Ecological impact of the mid-Holocene hemlock decline in southern Ontario, Canada . Ecology79, 2337-2351 .
23.
Futyma, R.P.2000: Wolverine Lake pollen data. In Grimm, E.C. , editor, North American pollen database, NOAAINGDC Paleoclimatology Program, Boulder, CO.
24.
Gaudreau, D.C. 1986: Late-Quaternary vegetational history of the northeast: paleoecological implications of topographic patterns in pollen distributions. PhD thesis, Yale University, New Haven, CT.
25.
Gauthier, R. 1981: Histoire de la colonisation v1!getale postglaciaire des Montirigiennes: deux sites du mont Saint-Bruno. PhD thesis, Universit6 de Montreal, Quebec.
26.
Gleason, HA.1952: The News Britton and Brown illustratedflora of the Northeastern United States and adjacent Canada. New York: New York Botanical Garden .
27.
Grimm, E.C.1992: TILIA (software). Springfield: Illinois State Museum .
28.
Hadden, K.A.1975: A pollen diagram from a post-glacial peat bog in Hants County, Nova Scotia . Canadian Journal o Botany53, 39-47 .
29.
Hall, R.I. and Smol, J.P.1993: The influence of catchment size on lake trophic status during the hemlock decline and recovery (4800 to 3500 BP) in southern Ontario lakes . Hydrobiologia269, 371-390 .
30.
Heide, K.1984: Holocene pollen stratigraphy from a lake and small hollow in north-central Wisconsin, USA . Palynology8, 3-20 .
31.
Jacobson, G.L. Jr2000a: Loon Pond pollen data. In Grimm, E.C. , editor, North American pollen database, NOAA/NGDC Paleoclimatology Program, Boulder, CO.
32.
Jacobson, G.L. Jr2000b: Poland Spring Pond pollen data. In Grimm, E.C. , editor, North American pollen database, NOAAINGDC Paleoclimatology Program, Boulder, CO.
33.
Jacobson, G.L. Jr , Webb, T. III and Grimm, E.C.1987: Patterns and rates of vegetation change during the deglaciation of eastern North America. In Ruddiman, W.F. and Wright, H.E. Jr , editors, North America and adjacent oceans during the last deglaciation, The Geology of North America Volume K-3, Boulder, CO: Geological Society of America , 277-288.
34.
Kapp, R.O.2000: Demont Lake pollen data. In Grimm, E.C. , editor, North American pollen database, NOAAINGDC Paleoclimatology Program, Boulder, CO.
35.
Kellogg, D.C. 1991: Prehistoric landscaper paleoenvironments, and archaeology of Western Muscongus Bay, Maine. PhD thesis, University of Maine, Orono.
36.
Labelle, C. and Richard, P.1981: Vegetation tardiglaciaire et postglaciaire au sud-est du parc des Laurentides, Quebec . Geiographie physique et quaternaire35, 345-359 .
37.
Lawrenz, R.W. 1975: The developmental paleoecology of Green Lake, Antrim County, Michigan. PhD thesis, Central Michigan University, Mount Pleasant.
38.
Little, E.L. Jr1971: Atlas of United States trees, vol. 1. Coniyfrs and important hardwoods. 1146 Miscellaneous Publication, US Department of Agriculture Forest Service .
39.
Liu, K.B.1990: Holocene paleoecology of the boreal forest and Great Lakes-St Lawrence forest on northern Ontario . Ecological Monographs60, 179-212 .
40.
Livingstone, D.A.1968: Some interstadial and post-glacial pollen diagrams from eastern Canada . Ecological Monographs38, 87-125 .
41.
Maenza-Gmelch, T.E.1997a: Holocene vegetation, climate, and fire history of the Hudson Highlands, southeastern New York, USA . The Holocene7, 25-37 .
42.
Maenza-Gmelch, T.E.1997b: Vegetation, climate, and fire during the late-glacial-holocene transition at Spruce Pond, Hudson Highlands, southeastern New York, USA . Journal of Quaternary Science12, 15-24 .
43.
McAndrews, J.H. 1973: Pollen analyses of the sediments of the Great Lakes of North America In Palynology: Holocene and marine palynology, Proceedings of the Third International Palynological Conference, Moscow: Nauka, 76-80 .
44.
McAndrews, J.H.1981: Late Quaternary climate of Ontario: temperature trends from the fossil record. In Mahaney, W.C. , editor, Quaternarv paleoclimate, Norwich: GeoAbstracts , 319-333.
45.
McAndrews, J.H.2000: Shouldice Lake pollen data. In Grimm, E.C. , editor, North American pollen database, NOAA/NGDC Paleoclimatology Program, Boulder, CO.
46.
McAndrews, J.H. and Campbell, ID.1993: 6 ka mean July temperature in eastern Canada from Bartlein and Webb's (1985) pollen transfer functions: comments and illustrations. In Telka, A. , editor, Proxy climate data and models of the six thousand years before present time interval: the Canadian perspective, IR93-3 Canadian Global Changes Program Incidental Report Series, Royal Society of Canada , 22-25.
47.
Miller, N.G.1973: Late-glacial and postglacial vegetation change in southeastern New York State . Bulletin of the New York State Museum Science Service420, 102-102 pp.
48.
Mott, R.J.1975: Palynological studies of lake sediment profiles from southwestern New Brunswick . Canadian Journal of Earth Sciences12, 273-288 .
49.
Mott, R.J.1977: Late-Pleistocene and Holocene palynology in southwestern Quebec . Giographie Physique et Quaternaire31, 139-149 .
50.
Mott, R.J.1978: Populus in late-Pleistocene pollen spectra . Canadian Journal of Botany56, 1021-1031 .
51.
Mott, RJ. and Farley-Gill, L.D.1978: A late-Quaternary pollen profile from Woodstock, Ontario . Canadian Journal of Earth Science.s15, 1101-1111 .
52.
Mott, RJ. and Farley-Gill, L.D.1981: Two late Quaternary pollen profiles from Gatineau Park, Quebec . Geological Sunrey of Canada Special Paper, 80-3110-10 pp.
53.
Nelson, S.1984: Upland and wetland vegetational changes southeastern Massachusetts: a 12,000 year record . Northeastern Geology6, 181-191 .
54.
Newman, W.M. and Sproull, RXF . 1981: Principles of interactive computer graphics (second edition). Singapore: McGraw-Hill .
55.
Nickman, RJ.2000: Spring Lake pollen data. In Grimm, E.C. , editor, North American pollen database, NOAA/NGDC Paleoclimatology Program, Boulder, CO.
56.
Overpeck, J.T.1985: A pollen study of a late Quaternary peat bog, southcentral Adirondack Mountains, New York . Geological Society o)f America Bulletin96, 145-154 .
57.
Press, W.IL , Teukolsky, SA. , Vetterling, W.T. and Flannery, B.P.1992: Numerical recipes in C: the art of scientific computing (second edition). Cambridge: Cambridge University Press .
58.
Rasmussen, J.B. 1982: Pollen stratigraphy and vegetational history of Cub Lake, Kalkaska County, Michigan. PhD thesis, Central Michigan University, Mount Pleasant.
59.
Richard, P.J.H. 1977: Histoire post-wisconsinienne de la vegetation du Qu6bec m6ridional par l'analyse pollinique. Technical report, Service de Ia recherche, Direction generale des forats. Ministere des Terres et Forhts du Qu6bec, Quebec, Canada.
60.
Richard, P.J.H.1978: Histoire tardiglaciare et postglaciare de la vegbtation au Mont Shefford, Quebec . Gedgraphie physique et quaternaire32, 81-93 .
61.
Richard, P.J.H.2000a: Lac a Sam pollen data. In Grimm, E.C. , editor, North American pollen database, NOAAINGDC Paleoclimatology Program, Boulder, CO.
62.
Richard, P.J.H.2000b: Lac Castor pollen data. In Grimm, E.C. , editor, North American pollen database, NOAA/NGDC Paleoclimatology Program, Boulder, CO.
63.
Richard, P.J.H.2000c: Lac Geai pollen data. In Grimm, E.C. , editor, North American pollen database, NOAA/NGDC Paleocliniatology Program, Boulder, CO.
64.
Richard, P.J.H.2000d: Saint-Calixte pollen data. In Grimm, E.C. , editor, North American pollen database, NOAA/NGDC Paleoclimatology Program, Boulder, CO.
65.
Savoie, L. and Richard, P.1979: Palbophytogeographiede l'pisode de Saint-Narcisse dans la region de Sainte-Agathe, Quebec . Gedgraphie Physique et Quaternaire33, 175-188 .
66.
Spear, R.W. and Miller, N.G.1976: A radiocarbon dated pollen diagram from the Allegheny Plateau of New York State . Journal of the Arnold Arboretum57, 369-403 .
67.
Spear, R.W. , Davis, M.B. and Shane, L.C.K.1994: Late-Quaternary history of lowand mid-elevation vegetation in the White Mountains of New Hampshire . Ecological Monographs64, 85-109 .
68.
Stuiver, M. , Reimer, P.J. , Bard, E. , Beck, J.W. , Burr, G.S. , Rughen, KA. , Kromer, B. , McCormac, G. , van der Plicht, J. and Spurk, M.1998: INTCAL98 radiocarbon age calibration, 24,000-0 cal BP . Radiocarbon40. 1041-1083 .
69.
Suter, S.M.1985: Late-glacial and Holocene vegetation history in southeastern Massachusetts: a 14,000 year pollen record . Current Research in the Pleistocene2, 87-89 .
70.
Szeicz, J.M. and MacDonald, G.M.1991: Postglacial vegetation history of oak savanna in southern Ontario . Canadian Journal of Botany69, 1507-1519 .
71.
Watts, W.A.1979: Late Quaternary vegetation of central Appalachia and the New Jersey coastal plain . Ecological Monographs49, 427-469 .
72.
Webb, S.L. 1986: The Holocene extension of the range of American Beech Fagus grandifolia into Wisconsin: paleoecological evidence fbr long-distance seed dispersal. PhD thesis, University of Minnesota, Minneapolis.
73.
Webb, T. III1982: Temporal resolution in Holocene pollen data . Third North American Paleontological Convention Proceedings2, 569-572 .
74.
Whitehead, D.R.1979: Late-glacial and postglacial vegetational history of the Berkshires, western Massachusetts . Quaternary Research12, 333-357 .
75.
Whitehead, D.R. and CrIsman, T.L.1978: Paleolimnological studies of small New England (USA) pomds. Part I. Late-glacial and postglacial oscillations . Polskde Arch-wm Hydrobiologie25, 471-481 .
76.
Winkler, M.G.1985: A 12,000-year history of vegetation and climate for Cape Cod, Massachusetts . Quaternary Research23, 301-312 .
77.
Winkler, M.G.1988: Paleolimnology of a Cape Cod kettle pond: diatoms and reconstructed pH . Ecological Monographs58, 197-214 .
78.
Woods, K.D. and Davis, M.B.1989: Paleoecology of range limits: beech in the Upper Peninsula of Michigan . Ecology70, 681-696 .
