Fossil chrysophycean cyst flora in a small meromictic lake in southern Ontario, and its paleoecological interpretation

Rybak, Mariusz; Rybak, Izabela; Dickman, Mike

doi:10.1139/b87-330

Cited by 36 publications

(18 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Wilkinson et al (1999) observed the same relationship with Na + and dissolved TP for Dinobryon cylindricum (cyst 41), which is corroborated by this study (Figure 3). D. cylindricum has formerly been described as typical of cool, oligotrophic to mildly eutrophic waters (Rybak 1986;Rybak et al 1987;Eloranta 1989;Siver 1995) and appears to be fairly representative of arctic environments (Duff and Smol 1989). There is, however, some debate about its pH optimum.…”

Section: Cyst Autecologymentioning

confidence: 99%

Distribution and Autecology of Chrysophyte Cysts from High Arctic Svalbard Lakes: Preliminary Evidence of Recent Environmental Change

Betts-Piper

Zeeb

Smol

2004

Journal of Paleolimnology

View full text Add to dashboard Cite

Chrysophycean stomatocyst assemblages were analysed from the sediments of 17 lakes and ponds from Svalbard as one component of a multi-proxy investigation of recent environmental change in the high Arctic. Sediment cores and water chemistry were collected from each of the study lakes, and chrysophyte stomatocysts were investigated from the top 0.25 cm of sediment (present-day) and bottom (i.e. bottom of short sediment core, pre-industrial) sediment samples. This study represents the first undertaking of chrysophyte cyst morphology and distribution on Svalbard. A total of 153 cyst morphotypes were described with light microscopy and/or scanning electron microscopy, of which 21 are new forms.Canonical correspondence analysis indicates that the present-day distribution of cysts is significantly related to pH (p = 0.02), altitude (p = 0.02), and Na + (p = 0.04). Marked shifts in chrysophyte cyst assemblages were recorded between the top and bottom sediment samples of most lakes. Rose et al. (2004) have demonstrated that Svalbard lakes receive atmospheric contaminants from both local and remote sources. The observed assemblage shifts may be the result of the combined effects of these point sources and long-range pollutants, or the effects of recent climate change, or both.

show abstract

Section: Cyst Autecologymentioning

confidence: 99%

Distribution and Autecology of Chrysophyte Cysts from High Arctic Svalbard Lakes: Preliminary Evidence of Recent Environmental Change

Betts-Piper

Zeeb

Smol

2004

Journal of Paleolimnology

View full text Add to dashboard Cite

show abstract

“…13). Similar cysts include: Nygaard (1956) -cysta microspinosa, cysta stellata; Rybak (1986Rybak ( , 1987, Rybak et al (1987) -cysta stellata (Kortowskie Lake), cyst 23 (Racze lake), cyst 19 (Crawford Lake); Smith & White (1985) - Fig. 14 (Coldwater Lake); Duff & Smol (1989, 1991 -type 33 (Tasikutaaq Lake), type91 (Upper Wallface Pond). , 1980b is not.…”

Section: Cyst # 3 (Fig 5; Negative No Eb37-007) (Diameter: 4-7 I~m)mentioning

confidence: 99%

“…The surface is quite smooth to micro-textured. This cyst type is distributed quite widely: Nygaard (1956), Carney & S andgren (1983) -cysta curvieollis; -cyst 9; , 1980b, Adam & Mehringer (1980a) -type 56 (Upper Echo Lake, Alta Morris Lake, Lost Trail Pass Bog, Lake Aloha); Rybak (1986) -cysta curvicollis (Kortowskie Lake); Rybak et al (1987) -cyst 3 (Crawford Lake); Duff& Smol (1989) cyst 41 (Tasikutaaq Lake). This cyst type is probably produced primarily by Dinobryon cylindricum Imhof.…”

Section: Cyst # 13 (Fig 14; Negative No L450-005) (Diameter: 35-7mentioning

confidence: 99%

Chrysophycean cysts in Sierra Nevada (California) lake sediments: paleoecological potential

et al. 1992

View full text Add to dashboard Cite

Thirty-three lakes in the Sierra Nevada range of California were investigated as part of a paleoecological study of the potential effects of acid deposition on sensitive lake/watershed ecosystems. Chrysophyte cysts from surface sediment samples were analyzed and compared with data on pH and alkalinity. This paper identifies the twenty-five dominant chrysophyte cyst taxa and provides information on their morphology, abundance, distribution and ecology. Chrysophycean cysts were generally abundant and well-preserved in lake sediments of our study sites. Twelve taxa occurred in more than twenty of the thirty-three lakes; these taxa were often quite abundant. In contrast, only nine taxa occurred in ten or fewer lakes. Abundance Weighted Mean (AWM) pH varied from 6.45 to 8.34 and AWM alkalinity varied from 46 to 588 ~eq/L. We delineated pH preference categories, based on AWM pH values and frequency diagrams of cyst abundance vs. lakewater pH. We classified five taxa as acidophilous, nine as circumneutrals, six as alkaliphilous and five as indifferent. Given that the cyst types differ greatly in their abundance relative to pH and alkalinity, it is clear that they have potential for paleolimnological studies of Sierra lakes biogeochemistry.

show abstract

“…These changes in accumulation rates were closely correlated with trends in lake productivity as indicated by changes in fossil pigments and diatoms (see below) as well as chrysophycean cysts (Rybak et al, 1987b) .…”

Section: Methodsmentioning

confidence: 63%

Paleoecological reconstruction of changes in the productivity of a small, meromictic lake in Southern Ontario, Canada

Rybak¹,

Dickman

1988

Hydrobiologia

Self Cite

View full text Add to dashboard Cite

Some aspects of the paleoproductivity of meromictic Crawford Lake, near Toronto, are inferred from a study of its sedimentary pigments, and diatoms . Several stages of lake development are observed over the 35 cm-deep sediment core removed from the center of Crawford Lake . Evidence of changes in lake productivity during the last 300 years was reflected by significant stratigraphic sediment pigment changes which were associated with European settlement in the Crawford Lake watershed and recent alterations associated with the area's operation by the Conservation Authority (1969 -present) . One of the most important factors correlated with paleoproductivity was land clearance (mainly logging of white oak and pine) . Deforestation during the last century is correlated with an increase in the amount of algal pigments deposited in the lake's sediments during the 1800's . During the last 10 years a striking increase in the accumulation of chlorophyll derivatives was observed . This is correlated with a dramatic increase in the number of visitors to the lake .Stratigraphic changes in the ratio of cyanobacterial to phototrophic bacterial pigment accumulation are used to infer changes which occurred during the shift from mesotrophy to eutrophy in Crawford Lake.

show abstract

Fossil chrysophycean cyst flora in a small meromictic lake in southern Ontario, and its paleoecological interpretation

Cited by 36 publications

References 0 publications

Distribution and Autecology of Chrysophyte Cysts from High Arctic Svalbard Lakes: Preliminary Evidence of Recent Environmental Change

Distribution and Autecology of Chrysophyte Cysts from High Arctic Svalbard Lakes: Preliminary Evidence of Recent Environmental Change

Chrysophycean cysts in Sierra Nevada (California) lake sediments: paleoecological potential

Paleoecological reconstruction of changes in the productivity of a small, meromictic lake in Southern Ontario, Canada

Contact Info

Product

Resources

About