Baptiste Lake, Alberta ? A late Holocene history of changes in a lake and its catchment in the southern Boreal forest

Hickman, Michael; Schweger, Charles E.; Klarer, David M.

doi:10.1007/bf00239698

Cited by 23 publications

(10 citation statements)

References 36 publications

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“…4), these changes did not greatly alter community composition. These patterns are consistent with analyses of fossil pigments and diatoms from these (Hall et al 1999a,b) and other prairie lakes (Hickman and Klarer 1981;Vinebrooke et al 1998;Blais et al 2000) that show little effect of grassland conversion to agriculture on algal communities and water quality. However, our results contrast with other paleoecological investigations, which demonstrate that deforestation and concomitant agricultural development profoundly alter lake chemistry and biotic composition (e.g., Siver et al 1999).…”

Section: Discussionsupporting

confidence: 83%

Landscape effects of climate, agriculture, and urbanization on benthic invertebrate communities of Canadian prairie lakes

Quinlan

Leavitt

Dixit

et al. 2002

Limnology & Oceanography

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Paleoecological analyses of fossil chironomid assemblages from eight lakes of the Qu'Appelle Valley, Saskatchewan, Canada, were used to quantify the relative influence of climate, resource use, and urbanization on benthic invertebrate communities 1850-1995. Fossil analyses inferred that Qu'Appelle lakes are naturally productive but that invertebrate communities were altered by agriculture and urbanization. In western lakes, rates of community change (chord distance per 5 yr) were low and nonsignificant (P Ͼ 0.05) prior to European settlement, but increased twofold after ϳ1930-1940. In contrast, uniformly significant rates of community change were recorded in eastern downstream lakes only after the 1960s. In both cases, high rates of change corresponded to alterations in the balance between deep-water (Chironomus) and littoral species (Cladotanytarsus mancus group, Tanytarsus s.lat. [s.l.]).Comparison of historical and fossil time series (ϳ1920-1993) using variance partitioning analysis (VPA) explained up to 86.6% of past variations in chironomid community composition. Unexpectedly, climate (winter temperature) explained a significant (P Ͻ 0.05) and substantial (mean Ϯ SD, n ϭ 8; 24.8 Ϯ 21.9%) amount of community variance at all sites except Round Lake. In contrast, land-use practices exhibited significant but less substantial (6.7 Ϯ 6.1%, n ϭ 8) impacts on zoobenthos of five lakes, whereas significant urban impacts (3.6 Ϯ 7.5%, n ϭ 8) were recorded only at two sites. Similarly, redundancy analysis showed that minimum winter or spring temperature significantly influenced the relative abundance of littoral taxa in seven lakes. Such strong effects of climate on benthic invertebrate communities contrast its weak effects on phytoplankton in these lakes and suggest that future environmental change may be expressed differentially among habitats.

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Section: Discussionsupporting

confidence: 83%

Landscape effects of climate, agriculture, and urbanization on benthic invertebrate communities of Canadian prairie lakes

Quinlan

Leavitt

Dixit

et al. 2002

Limnology & Oceanography

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“…It is only in the semi-arid regions, where precipitation events are not rare but evaporation nevertheless exceeds precipitation that neither the level of the sill nor the level of distally-recharged ground water will exert a controlling influence on lake level. This agrees well with previous studies in Alberta, which taken together form a transect from the Low Boreal Forest to the Shortgrass Prairie, in which the moister northern sites show less variation in lake level during the last few thousand years than the more southern sites (Hickman et al, 1990;Schweger and Hickman, 1989;Vance, 1991).…”

Section: Resultssupporting

confidence: 92%

Lake Area Variability Across a Climatic and Vegetational Transect in Southeastern Alberta

Campbell¹,

Campbell²,

Hogg³

2007

gpq

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ABSTRACTAreas of 34 small lakes forming a transect across the southern margin of the Boreal Forest into the Grassland in southern Alberta were obtained from 326 aerial photographs, with at least six photographs for each lake in different months and different years from 1949 to 1992. Standard deviations of standardised lake areas (used as an index of lake area sensitivity to short term climate fluctuations) were plotted against a climatic moisture index; the resulting scatter of points is constrained by a function relating lake sensitivity to long-term regional climatic moisture. The lakes show high sensitivity in the Grassland where potential évapotranspiration exceeds precipitation, a steep drop in sensitivity over a small range of climatic moisture values in the Aspen Parkland, and very low sensitivity in the Boreal Forest where precipitation exceeds potential évapotranspiration.

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“…La Ronge (Kuhry et al, 1992(Kuhry et al, , 1993, 70. Baptiste Lake (Hickman et al, 1990), 71. Beauval (Kuhry et al, 1993), 72.…”

Section: B) Boreal Forestmentioning

confidence: 99%

The Paleoecological Record of 6 ka BP Climate in the Canadian Prairie Provinces

Vance¹,

Beaudoin²,

Luckman³

2007

gpq

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ABSTRACTSynthesis of available paleoecological studies in the Prairie provinces of Canada indicates that although the peak in postglacial aridity that characterized early Holocene climate of the western foothills and plains had passed, conditions remained warmer and drier than present throughout the region ca. 6000 yr BP Compared to today, treeline elevations were higher and alpine glaciers were reduced in size in the Rocky Mountains, lake levels were lower over much of the Interior Plains, and the grassland and boreal forest ecozones extended north of their present positions. Forest fires were more prevalent ca. 6000 yr BP than they are today, aiding westward migration of jack pine (Pinus banksiana) through the boreal forest and increasing the area occupied by grassland in boreal and montane forest regions. Attempts to quantify the magnitude of 6 ka temperature and precipitation differences have produced variable results, but suggest that mean annual temperature was 0.50°C to 1.50°C higher than today (summer temperature may have been up to 3°C higher) and mean annual precipitation was reduced by 65 mm (or summer precipitation was reduced by 50 mm), compared to present. The nature and scale of these changes suggests that a vigorous zonal atmospheric circulation pattern, similar to that of the 1930s but shifted northward, prevailed at 6 ka.

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Baptiste Lake, Alberta ? A late Holocene history of changes in a lake and its catchment in the southern Boreal forest

Cited by 23 publications

References 36 publications

Landscape effects of climate, agriculture, and urbanization on benthic invertebrate communities of Canadian prairie lakes

Landscape effects of climate, agriculture, and urbanization on benthic invertebrate communities of Canadian prairie lakes

Lake Area Variability Across a Climatic and Vegetational Transect in Southeastern Alberta

The Paleoecological Record of 6 ka BP Climate in the Canadian Prairie Provinces

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