Distribution of scaled chrysophytes in 17 Adirondack (New York) lakes with special reference to pH

1988 ◽  
Vol 66 (7) ◽  
pp. 1391-1403 ◽  
Author(s):  
Peter A. Siver
Keyword(s):  
New York ◽  
Special Reference ◽  
Surface Sediments ◽  
Species Distributions ◽  
Franklin County ◽  
Scaled Chrysophytes ◽  
Bog Lakes ◽  
Adirondack Lakes ◽  
The Common ◽  
Similarities And Differences

Thirty-four scaled chrysophyte taxa are described from 17 Adirondack lakes located in either Hamilton or Franklin counties. Ten taxa, Synura sphagnicola, Syn. echinulata, Syn. petersenii, Mallomonas acaroides var. muskokana, M. hamata, M. caudata, M. crassisquama, M. galeiformis, Spiniferomonas trioralis, and Chrysosphaerella longispina, were found in more than 40% of the study lakes. Mallomonas acaroides var. muskokana, M. hamata, Syn. sphagnicola, Syn. echinulata, and Spiniferomonas coronacircumspina were common and important components of the phytoplankton floras in lakes with a pH < 5.4; however, M. hamata and Sp. coronacircumspina were noticeably absent from bog lakes. Synura sphagnicola and Syn. echinulata were as common in samples with a pH between 5.4 and 7 as they were below pH 5.4. Mallomonas crassisquama, M. caudata, M. pseudocoronata, and Synura spinosa were found in a significantly greater percentage of samples from circumneutral lakes and were lacking from waters with a pH < 5.4. Differences in species distributions between Hamilton County (higher mean pH) and Franklin County lakes further supported the observed pH ranges of the common taxa. Similarities and differences are made with a study of Smol et al. (Can. J. Bot. 62: 911–923), who described the distribution of scaled chrysophytes from the surface sediments of Adirondack lakes.

When Did Acid-Sensitive Adirondack Lakes (New York, USA) Begin to Acidify and Are They Still Acidifying?

1994 ◽  
Vol 51 (7) ◽  
pp. 1550-1568 ◽  
Author(s):  
B. F. Cumming ◽  
K. A. Davey ◽  
J. P. Smol ◽  
H. J. B. Birks
Keyword(s):  
New York ◽  
Transfer Function ◽  
Species Composition ◽  
Acidic Deposition ◽  
Sediment Cores ◽  
Scaled Chrysophytes ◽  
Sulfate Deposition ◽  
Ph Values ◽  
Water Ph ◽  
Adirondack Lakes

A transfer function was used to reconstruct pH values of 20 low-alkalinity Adirondack Park lakes based on the species composition of scaled chrysophytes (Chrysophyceae, Synurophyceae) in stratigraphie intervals from 210Pb-dated sediment cores. Approximately 80% of the lakes acidified since preindustrial times. Four categories of lake response to acidic deposition were identified: (i) lakes that showed little or no evidence of acidification since preindustrial times, (ii) lakes with preindustrial pH values between 5 and 6 that began to acidify ca. 1900, (iii) "naturally" acidic lakes that acidified even further ca. 1900, and (iv) lakes with preindustrial pH values around 6 that acidified ca. 1930–50. Lakes that acidified ca. 1900 were generally smaller, higher elevation lakes with lower preindustrial pH values than lakes in category i or iv. These patterns are consistent with the acidic deposition hypothesis of recent lake acidification. Our results indicated that "critical" sulfate deposition loads for Adirondack lakes that started to acidify ca. 1900 and ca. 1950 are between 5–10 and 20–25 kg∙ha−1∙yr−1, respectively. Post-1970 trends in lake water pH have been small and variable, suggesting that low-alkalinity Adirondack lakes have been relatively unresponsive to the post-1970 declines in sulfate deposition.

Pre-Cambrian geology of the Chateaugay quadrangle, Franklin County, New York

1954 ◽  
Author(s):  
Arthur E. Nelson ◽  
Donald Richard Wiesnet ◽  
Albert Williams Postel
Keyword(s):  
New York ◽  
Franklin County
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