From Elsa.Peinerud@SB.LUTH.SETue Apr 29 15:42:54 1997 Date: Wed, 26 Mar 1997 10:12:19 +0000 From: Elsa Peinerud To: DIATOM-L@IUBVM.UCS.INDIANA.EDU Subject: diatom blooms in subarctic lakes [The following text is in the "iso-8859-1" character set] [Your display is set for the "US-ASCII" character set] [Some characters may be displayed incorrectly] Dear Diatomists, I am working on diatoms and variations of dissolved and particulate Si in lakes in northern Sweden. Here, I have found a continuous bloom throughout most of the ice-free season, and not, as is often described in literature, distinct blooms in spring and autumn. Does anyone have any references on similar bloom patterns? Another problem is the too high (compared with literature) values for Si content/cell that I have achieved in some of my samples. There might be several reasons for this, e. g. fractionation or loss of small diatoms during sample preparation. Has anyone came across this problem? Elsa Peinerud ************************************ Elsa Peinerud Div. of Applied Geology Dept. of Environmental Planning and Design Luleå University of Technology 971 87 Luleå Sweden phone: +46-920-91390 e-mail: Elsa.Peinerud@sb.luth.se From stoermer@UMICH.EDUTue Apr 29 15:42:54 1997 Date: Wed, 26 Mar 1997 09:38:33 -0500 From: Gene Stoermer To: DIATOM-L@IUBVM.UCS.INDIANA.EDU Subject: Re: diatom blooms in subarctic lakes On Wed, 26 Mar 1997, Elsa Peinerud wrote: > Dear Diatomists, > > I am working on diatoms and variations of dissolved and particulate Si in > lakes in northern Sweden. Here, I have found a continuous bloom throughout > most of the ice-free season, and not, as is often described in literature, > distinct blooms in spring and autumn. Does anyone have any references on > similar bloom patterns? Such patterns are common in a) lakes shallow enough to allow circulation to the bottom during summer and b) deep lakes large enough, or having morphometries conducive to upwellings. In the North American Great Lakes large shallow bays (western Lake Erie, Saginaw Bay of Lake Huron, Green Bay of Lake Michigan, etc.) have summer blooms throughout the summer. They are really periodic - depending on physical conditions - but diatoms are continuously present in abundance. Also in these lakes, the windward shores (Wisconsin shore of Lake Michigan, Michigan shore of Lake Huron, etc.) have quasi-continuous upwellings and maintain much higher proportions of diatoms in regional phytoplankton assemblages than mid-lake regions. Wind reversals occasionally cause massive upwellings on leeward shores, resulting in spectacular diatom blooms - similar to oceanic situations. Other situations I have investigated personally - shallow lakes in Florida have diatom blooms through even the warmest parts of the year - indeed there are a number of species of Aulacoseira that are particularly adapted to growth is such situaitons. Another case, perhaps more interesting to you is Douglas Lake, Michigan, where our University has its biological station. This is a fairly deep lake (25 m) with complex morphometry, whose long axis is aligned with the most common summer wind direction. Upwellings are generated throughout the summer which, in turn, generate periodic diatom blooms throughout the summer. > Another problem is the too high (compared with literature) values for Si > content/cell that I have achieved in some of my samples. There might be > several reasons for this, e. g. fractionation or loss of small diatoms during > sample preparation. Has anyone came across this problem? > What is too high? Freshwater diatoms generally have much higher silica content that one might think from reading the general literature. Dan Conley - now in Denmark - has written several papers about thisw. > Elsa Peinerud > > > ************************************ > Elsa Peinerud > Div. of Applied Geology > Dept. of Environmental Planning and Design > Luleå University of Technology > 971 87 Luleå > Sweden > phone: +46-920-91390 > e-mail: Elsa.Peinerud@sb.luth.se > ***************************************************************** Eugene Stoermer, University of Michigan Internet e-mail address: stoermer@umich.edu Voice Phone: 313-764-5238 Fax: 313-647-2748 ***************************************************************** From kingston@USGS.GOVTue Apr 29 15:42:54 1997 Date: Wed, 26 Mar 1997 08:45:25 -0700 From: "John C. Kingston" To: DIATOM-L@IUBVM.UCS.INDIANA.EDU Subject: Re: diatom blooms in subarctic lakes Elsa- You may be interested in papers about algal succession in Newfoundland, Canada. The island is characterized by a cold and windy climate, high precipitation, low evaporation, bogs and fens, very shallow soils, and lots of runoff. The lakes and ponds are almost all drainage systems (with inlet and outlet streams). Some of these papers show spring/fall abundance peaks of various algae, but you can see that some blooms extend through summer. Papers I could find quickly: Davis, C.C. 1972. Plankton succession in a Newfoundland lake. Int. Revue ges. Hydrobiol. 57(3): 367-395. Davis, C.C. 1973. A seasonal quantitative study of the plankton of Bauline Long Pond, a Newfoundland lake. Le Naturaliste Canadien 100 (2): 85-105. O'Connell, M.F. and C.W. Andrews. 1977. Plankton ecology in Long Pond, St. John's, Newfoundland: a polluted pond characterized by a high flushing rate. Int. Revue ges. Hydrobiol. 62(1): 133-152. Palmer, C.M. 1965. Phytoplankton periodicity in a Newfoundland pond. J. Phycol. 1: 38-39. --John ---------- From: Elsa Peinerud[SMTP:Elsa.Peinerud@SB.LUTH.SE] Sent: Wednesday, March 26, 1997 3:12 AM To: DIATOM-L@IUBVM.UCS.INDIANA.EDU Subject: diatom blooms in subarctic lakes Dear Diatomists, I am working on diatoms and variations of dissolved and particulate Si in lakes in northern Sweden. Here, I have found a continuous bloom throughout most of the ice-free season, and not, as is often described in literature, distinct blooms in spring and autumn. Does anyone have any references on similar bloom patterns? Elsa Peinerud ************************************ Elsa Peinerud Div. of Applied Geology Dept. of Environmental Planning and Design Lulea University of Technology 971 87 Lulea Sweden phone: +46-920-91390 e-mail: Elsa.Peinerud@sb.luth.se