Green Lake, British Columbia

Anomalous early 20th century sedimentation in proglacial Green Lake, British Columbia, Canada

Canadian Journal of Earth Sciences ◽

10.1139/e06-016 ◽

2006 ◽

Vol 43 (6) ◽

pp. 671-678 ◽

Cited By ~ 20

Author(s):

Brian Menounos

Keyword(s):

British Columbia ◽

Air Temperature ◽

Laminated Sediments ◽

Annual Maximum ◽

Coast Mountains ◽

Varve Thickness ◽

Green Lake ◽

Daily Discharge ◽

Temperature Records ◽

Temperature Proxy

Annually laminated sediments were recovered from Green Lake, a proglacial lake in the southern Coast Mountains in British Columbia, to examine their potential as a temperature proxy. Varve thickness is moderately correlated with temperature anomalies (A.D. 1900–1994) and annual maximum mean daily discharge of Lillooet River (A.D. 1930–1999), but these relations are not stable through time. Following A.D. 1977, the relation between varve thickness and annual maximum mean daily discharge is stronger. Prior to A.D. 1977, varve thickness is correlated with March to October air temperature, which controls the intensity and duration of glacier runoff. Varve thickness is weakly correlated with reconstructed air temperature records for North America and the Northern Hemisphere for the period A.D. 1600–1976. Less extensive glacier cover may explain the lack of a clear temperature signal in the varved sediment record prior to A.D. 1600 and following A.D. 1977. The period of highest lake sedimentation, from A.D. 1920 to 1945, coincides with rapid retreat of glaciers in the watershed. The lack of a similar level of sedimentation in the varve chronology suggests that glacier recession during the period 1920–1945 was higher than at any time in the past 600 years.

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Surficial geology, Green Lake, British Columbia

10.4095/247597 ◽

2009 ◽

Cited By ~ 3

Author(s):

A Plouffe

Keyword(s):

British Columbia ◽

Surficial Geology ◽

Green Lake

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First Records of the Yellow Bullhead, Ameiurus natalis, a Loricariid Catfish, Panaque suttonorum, and a Silver Pacu, Piaractus cf. P. brachypomus, in British Columbia

The Canadian Field-Naturalist ◽

10.22621/cfn.v120i4.349 ◽

2006 ◽

Vol 120 (4) ◽

pp. 421

Author(s):

G. F. Hanke ◽

M. C. E. McNall ◽

J. Roberts

Keyword(s):

British Columbia ◽

Micropterus Salmoides ◽

First Record ◽

Vancouver Island ◽

Western Canada ◽

Black Bullhead ◽

Green Lake ◽

Ameiurus Nebulosus ◽

Continental Divide ◽

Ameiurus Melas

In Canada, there are no native catfish west of the continental divide and until recently, the list of extant exotic catfishes in British Columbia only included introduced Black Bullhead (Ameiurus melas) and Brown Bullhead (Ameiurus nebulosus). We report that a single Yellow Bullhead (Ameiurus natalis) was collected from Silvermere Lake in the Lower Fraser River drainage. This represents the first record of the Yellow Bullhead in western Canada, and its introduction likely was accidental with a shipment of Largemouth Bass (Micropterus salmoides) rather than dispersal from Washington. Warm, eutrophic, weedy habitat in the Fraser Delta provides ample habitat for Yellow Bullheads and other exotic fishes. A Blue-eyed Panaque (Panaque suttonorum), a loricariid catfish found in 1995 in Shawnigan Lake, Vancouver Island, probably represents a single, illegally released aquarium fish, as does a large Silver Pacu (Piaractus cf. P. brachypomus), which was found in Green Lake on Vancouver Island in 2004.

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