From: PO4::"QUATERNARY@MORGAN.UCS.MUN.CA" "Research in Quaternary Science" 27-APR-1996 11:56:00.17 To: Multiple recipients of list QUATERNARY CC: Subj: Re: Marginal and central core sequences At 12:14 26/04/96 +0100, you wrote: >As part of my PhD I am currently investigating the biostratigraphy >(molluscan and ostracod faunas) of a Holocene and Late-glacial sequence. >Two cores have been taken from the centre and margin of a marl lake in >Central East Anglia, UK, in an attempt to facilitate a more detailed >palaeolimnological understanding of the lake and eventually a >palaeoclimatic reconstruction of this area. To my knowledge very few >studies of this nature (comparing marginal and central sequences) have >been carried out. I am therefore interested in knowing whether any >similar work has been carried out or published, not just in the world of >molluscs and ostracods, but also pollen, diatoms and macrofossils. > >David C. Horne David and the list: Well, I hate to toot my own trumpet, but you might find the following paper of interest (Title and abstract follow): A.B. Beaudoin and M.A. Reasoner (1992) Evaluation of differential pollen deposition and pollen focussing from three Holocene intervals in sediments from Lake O'Hara, Yoho National Park, British Columbia, Canada: intra-lake variability in pollen percentages, concentrations and influx" Review of Palaeobotany and Palynology 75:103-131 Abstract: Pollen spectra from three discrete intervals, dated by tephras and radiocarbon, are examined in a lake-wide series of nineteen cores from Lake O'Hara, Yoho National Park. These represent three different pollen assemblage zones recognized in the record of a single core (LOH25). The three sample sets provide lake-wide pollen assemblages at ca. 2350, ca. 6800, and ca. 10,100 yr BP. These spectra are used to investigate two aspects of pollen accumulation: 1. whether pollen taxa have been differentially deposited in sediments in different parts of the lake basin, and 2. whether the entire assemblage has accumulated to a greater extent in deeper parts of the basin ("pollen focussing"). Percentages of the ten major taxa in the assemblages show remarkable basin-wide consistency within each sample set, suggesting that in this case a single core provides a representative pollen record. Multivariate statistical analyses (discriminant function analysis and analysis of variance) on pollen percentage, concentration, and influx data confirm that sample sets are distinctly different and supports zonation of the pollen record from a single core. Minor components of the assemblages (<1% of the pollen sum), mainly NAP, show great variability within and between sample sets and are therefore not reliable for interpretation of vegetation history. Lack of evidence for differential pollen deposition confirms that qualitative inferences based on major components of the pollen sum are probably reliable despite core location within the lake basin. The data do not display consistent evidence for greater pollen accumulation at deeper water sites implying that pollen focussing has not been a major process. Sedimentation rates are variable across the basin at each level, suggesting that pollen concentration and particularly pollen influx data are not reliable for interpretation of vegetation history from a single core, without much greater chronologic control. The paper also contains references to just about all the papers on this topic that we could find at that time, so it may be a useful starting point. I have a few reprints left so if you, or anyone else on the list, would like one, please let me know. Hope this is useful, Best regards, Alwynne Alwynne B. Beaudoin | My opinions do Palaeoenvironmentalist, Archaeological Survey | not represent Provincial Museum of Alberta | my employers 12845-102nd Avenue, Edmonton, Alberta, T5N 0M6, Canada | abeaudoi@gpu.srv.ualberta.ca | From: PO2::"rick.barbiero@SEAWEED.UCG.IE" "Rick Barbiero" 29-APR-1996 03:46:17.49 To: Multiple recipients of list ALGAE-L CC: Subj: Re: Strange phenomenon >Hi there, > >In shallow, eutrophic lakes and lowland rivers at around this time of the >year >bottom sediments often rise to the water surface bound up in a loose matrix >of filamentous algae. >Does anyone know anything about the mechanism behind this phenomenon or of >any referneces which talk about this process. Any ideas and help will be >very >much appreciated. > >Carl. > Hi Carl, That phenomenon, of benthic filamentous algae 'taking off' into the water column, is pretty common, and can even lead to what look like algal blooms in some cases. In Holland they even have a name for the water column stage of this phenomenon: Flab (see Hillebrand, H., 1983, pp. 31-39 in: Wetzel, R.G. (ed.), Periphyton of Freshwater Ecosystems, Junk Publishers, The Hague). In the Deep South in the US, there is a species of blue green alga, Lyngbia wollei, I believe, that forms nuisance growths in this manner. Barbara Speziale did some work on this critter a few years ago, though I don't have any references at hand. She's on the list, though, and perhaps will respond. Regards, Rick ============================== Rick Barbiero, Boy Limnologist Department of Botany, Block C University College Galway Galway, IRELAND. E-mail: rick.barbiero@seaweed.ucg.ie ============================== From: PO3::"QUATERNARY@MORGAN.UCS.MUN.CA" "Research in Quaternary Science" 30-APR-1996 04:53:45.55 To: Multiple recipients of list QUATERNARY CC: Subj: Marginal and central core sequences To Multiple recipients of the Quaternary list. Below are the references that have been suggested to me re: marginal and central core sequences, in no particular order. I hope you find them useful. Thank you to those who have contacted me regarding the above, in total I think I had around 18 replys, with some messages still coming in. yours David Horne Winkler. M.G. 1986 Middle Holocene Dry Period in the northern Midwestern United States: Lake Levels and Pollen Stratigraphy. Quat Res. 25 235-250 Beaudoin, A.B. & Reasoner, M.A., 1992.Evaluation of differential pollen deposition and pollen focusing from three Holocene intervals in sediments from Lake O'Hara, Yoho National Park, British Columbia, Canada: intra-lake variability in pollen percentages, concentration and influx. Review of Palaeobot. and Palynology, 75, p. 103-131. Gale S. et al. 1995 the 210Pb chronology of Late holocene deposition in an Eastern Australian lake basin. Quat. Sci. Rev. 14.4. 1995 p395-408 Boyd. W.E. 1988. Early Flandrian vegetation development on the coastal plain of north Ayrshire, Scotland: evidence from multiple pollen profiles. Journal of Biogeography, 15, 325-337 Bennett. K.D. 1983 Devensian Late-glacial and Flandrian vegetational history at Hockham Mere, Norfolk, England. New Phytologist, 95 457-487. Birks H.J.B., & Birks, H.H. 1980. Quaternary palaeoecology. London: Edward Arnold Limited. Glaser, P.H. 1981. Transport and deposition of leaves and seeds on tundra: a late-glacial analog. Arctic & Alpine Res. 13(2), 173-182 Warner, B.G., & Barnett, P.J. 1986. Transport, sorting and reworking of late Wisconsinan plant macrofossils from Lake Erie, Canada. Boreas, 15(4), 323-329 Winkler. M.G., & Sanford. P.R. 1995. Coastal Massachusetts pond development: edaphic, climatic, and sea level impacts since deglaciation. Journal of Palaeolimnology. 14. 311-336 Winkler. M.G.1985. A 12,000-Year History of Vegetation and climate for Cape Cod, Masssachusetts. Quat, Res. 23. 301-312 Winkler. M.G. 1988. Palaeolimnology of a Cape Cod Kettle Pond: Diatoms and reconstructed pH. Ecological Monographs, 58(3), pp197-214 Wolfe. 1996. Canadian Journal of Botany 74: 345-449 (Title not supplied). From: PO3::"QUATERNARY@MORGAN.UCS.MUN.CA" "Research in Quaternary Science" 30-APR-1996 14:47:21.23 To: Multiple recipients of list QUATERNARY CC: Subj: Re: Marginal and central core sequences >To Multiple recipients of the Quaternary list. Below are the >references that have been suggested to me re: marginal and central core >sequences, in no particular order. I hope you find them useful. > >Thank you to those who have contacted me regarding the above, in total I >think I had around 18 replys, with some messages still coming in. > Dear David, I did not recognize any malacological paper among your listed replys. Therefore, rather late, but still a reply of mine. In my paper on the Belvedere site, I drew some conclusions about the relative distance of the marginal area of the waterbody of two sections (sections 2 and 3). Because I am also interested in this subject I want to ask you to put the additional replys on the list as well. Meijer, T., 1985. The pre-Weichselian non-marine molluscan fauna from Maastricht-Belvedere (Southern Limburg, The Netherlands). - Meded. Rijks Geol. Dienst, 39(1): 75-103, 6 figs, 3 tabs, 2 pls. Bye, Tom. ------------------------------------------------------------------------------ Tom Meijer e-mail: T.Meijer@Inter.NL.net & T.Meijer@RGD.NL ------------------------------------------------------------------------------ Political decisions are made by expertologists with a thin twodimensional brainframe (This estimate of dimensional complexity may be wildly optimistic). ------------------------------------------------------------------------------ From: PO4::"QUATERNARY@MORGAN.UCS.MUN.CA" "Research in Quaternary Science" 26-APR-1996 07:22:46.38 To: Multiple recipients of list QUATERNARY CC: Subj: Marginal and central core sequences To all recipients, As part of my PhD I am currently investigating the biostratigraphy (molluscan and ostracod faunas) of a Holocene and Late-glacial sequence. Two cores have been taken from the centre and margin of a marl lake in Central East Anglia, UK, in an attempt to facilitate a more detailed palaeolimnological understanding of the lake and eventually a palaeoclimatic reconstruction of this area. To my knowledge very few studies of this nature (comparing marginal and central sequences) have been carried out. I am therefore interested in knowing whether any similar work has been carried out or published, not just in the world of molluscs and ostracods, but also pollen, diatoms and macrofossils. David C. Horne Dept. of Zoology University of Cambridge New Museum site Downing Street Cambridge CB2 3EJ Tel: 01223 336629 Fax: 01223 336676 E-mail: dch23@cus.cam.ac.uk