Stable isotope composition of the Miocene Dinaride Lake System deduced from its endemic mollusc fauna

Hydrobiologia

Volumn 682, Issue 1, 2012, Pages 27-46

  Harzhauser, Mathias ^a   Mandic, Oleg ^a   Latal, Christine ^b   Kern, Andrea ^a  

^a NATURHISTORISCHES MUSEUM WIEN   (Austria)

^b GRAZ UNIVERSITY OF TECHNOLOGY   (Austria)

Author keywords

Ancient lakes; Coexistence approach; Endemism; Freshwater molluscs; Miocene; Stable isotopes

Indexed keywords

ADAPTIVE RADIATION; AIR TEMPERATURE; ARAGONITE; CARBON ISOTOPE; CATCHMENT; COEXISTENCE; DATA SET; DISSOLVED INORGANIC CARBON; ENDEMISM; HABITAT STRUCTURE; ISOTOPIC COMPOSITION; LAKE ECOSYSTEM; MIOCENE; MOLLUSC; OXYGEN ISOTOPE; PALEOBOTANY; PALEOECOLOGY; PALEOENVIRONMENT; SHELL; SPECIATION (BIOLOGY); STABLE ISOTOPE; SURFACE WATER; SYMPATRY; WATER TEMPERATURE;

MOLLUSCA; PERIZOMA ALCHEMILLATA;

EID: 84856191515     PISSN: 00188158     EISSN: 15735117     Source Type: Journal    
DOI: 10.1007/s10750-011-0618-3     Document Type: Article

References (95)

1. Albrecht, C., S. Trajanovski, K. Kuhn, B. Streit & T. Wilke, 2006. Rapid evolution of an ancient lake species flock: freshwater limpets (Gastropoda: Ancylidae) in the Balkan Lake Ohrid. Organisms, Diversity & Evolution 6: 294-307.
2. Albrecht, C., C. Wolff, P. Gloer & T. Wilke, 2008. Concurrent evolution of ancient sister lakes and sister species: the freshwater gastropod genus Radix in lakes Ohrid and Prespa. Hydrobiologia 615: 157-167.
3. Anadón, P., M. Martín-Rubio, J. Robles, J. Rodriguez-Lázaro, R. Utrilla & A. Vázquez, 2010. Variation in Sr uptake in the shell of the freshwater gastropod Bithynia tentaculata from Lake Arreo (northern Spain) and culture experiments. Palaeogeography, Palaeoclimatology, Palaeoecology 288: 24-34.
4. Babić, L. & J. Zupanič, 2007. Major events and stages in the Paleogene Promina Basin (Dinarides, Croatia). Natura Croatica 16: 215-232.
5. Bandel, K., 1990. Shell structure of the Gastropoda excluding the Archaeogastropoda. In Carter, J. G. (ed.), Skeletal Biomineralization: Patterns Processes and Evolutionary Trends 1. van Nostrand Reinolds, New York: 117-134.
6. Bandel, K., N. Sivan & J. Heller, 2007. Melanopsis from Al-Qarn, Jordan Valley (Gastropoda: Cerithioidea). Paläontologische Zeitschrift 81: 304-315.
7. Bilgin, F. H., 1973. Studies on the functional anatomy of Melanopsis praemorsa (L.) and Zemelanopsis trifasciata (Gray). Proceedings of the Malacological Society of London 40: 379-393.
8. Brendelberger, H. & S. Jürgens, 1993. Suspension feeding in Bithynia tentaculata (Prosobranchia, Bithyniidae), as affected by body size, food and temperature. Oecologia 94: 36-42.
9. Brown, D. S., 1994. Freshwater Snails of Africa and their Medical Importance, 2nd ed. Taylor & Francis, London.
10. Brusina, S., 1870. Monographie der Gattung Emmericia und Fossarulus. Verhandlungen der k. k. zoologisch-botanischen Gesellschaft in Wien 1870: 925-938.
11. Brusina, S., 1874. Fossile Binnen-Mollusken aus Dalmatien, Kroatien und Slavonien nebst einem Anhange. Deutsche vemehrte Ausgabe der kroatischen im Rad der südslavischen Akademie der Wissenschaften und Künste in Agram (28, 1874) erschienen Abhandlung, Actienbuchdruckerei, Agram. 1-143.
12. Brusina, S., 1876. Decription d'especes nouvelles, provenant des terrains tertiaires de Dalmatie. Journal de Conchyliologie 24: 109-116.
13. Brusina, S., 1878. Molluscorum fossilium species novae et emendatae, in tellure tertiaria Dalmatiae, Croatiae et Slavoniae inventae. Journal de Conchyliologie 1878: 1-10.
14. Brusina, S., 1882. Orygoceras, eine neue Gasteropoden-Gattung der Melanopsiden-Mergel Dalmatiens. Beiträge zur Paläontologie Österreich-Ungarns und des Orients 2: 33-46.
15. Brusina, S., 1884. Die Neritodonta Dalmatiens und Slavoniens nebst allerlei malakologischen Bemerkungen. Jahrbücher der Deutschen Malakozoologischen Gesellschaft 11: 17-120.
16. Brusina, S., 1897. Gragja za Neogensku Malakološku faunu Dalmacije, Hrvatske i Slavonije uz neke vrste iz Bosne, Hercegovine i Serbije. Djela Jugoslavenske Akademije Znanosti i Umjetnosti 18: 1-43.
17. Brusina, S., 1902. Iconographia Molluscorum Fossilium in tellure tertiaria Hungariae, Croatiae, Slavoniae, Dalmatiae, Bosniae, Herzegovinae, Serbiae and Bulgariae inventorum. 30 plates, Officina Soc. Typographicae, Agram, unpaginated.
18. Bunje, P. M. E., 2005. Pan-European phylogeography of the aquatic snail Theodoxus fluviatilis (Gastropoda: Neritidae). Molecular Ecology 14: 4323-4340.
19. Calow, P., 1975. The feeding strategies of two freshwater gastropods, Ancylus fluviatilis Müll. and Planorbis contortus Linn. (Pulmonata), in terms of ingestion rates and absorption efficiencies. Oecologia 20: 33-49.
20. Chergui, H. & E. Pattee, 1991. An experimental study of the breakdown of submerged leaves by hyphomycetes and invertebrates in Morocco. Freshwater Biology 26: 97-110.
21. Conroy, J., 2003. A high resolution Holocene paleoclimate record from Western Ireland: evidence from population, biometric, and stable isotope values of freshwater molluscs. 16th Keck Symposium Volume, 4 pages (unpaginated), Beloit College [http://keckgeology. org/files/pdf/symvol/16th/ireland/conroy. pdf].
22. Darling, W. G., 2004. Hydrological factors in the interpretation of stable isotopic proxy data present and past: a European perspective. Quaternary Science Reviews 23: 743-770.
23. de Leeuw, A., O. Mandic, A. Vranjković, D. Pavelić, M. Harzhauser, W. Krijgsman & K. F. Kuiper, 2010. Chronology and integrated stratigraphy of the Miocene Sinj Basin (Dinaride Lake System, Croatia). Palaeogeography, Palaeoclimatology, Palaeoecology 292: 155-167.
24. Dettman, D. L., 1999. Controls on stable isotope composition of seasonal growth bands in aragonitic fresh-water bivalves (unionidea). Geochimica et Cosmochimica Acta 63: 1049-1057.
25. Dettman, D. L., M. R. Palacios-Fest, H. H. Nkotagu & A. S. Cohen, 2005. Paleolimnological investigations of anthropogenic environmental change in lake Tanganyika: VII. Carbonate isotope geochemistry as a record of riverine runoff. Journal of Paleolimnology 34: 93-105.
26. Djamali, M., L. Soulié-Märsche, D. Esu, E. Ghiozzi & R. Okhravi, 2006. Palaeoenvironment of a Late Quaternary lacustrine-palustrine carbonate complex: Zarand Basin, Saveh, central Iran. Palaeogeography, Palaeoclimatology, Palaeoecology 237: 315-334.
27. Dokulil, M. T., A. Jagsch, G. D. George, O. Anneville, T. Jankowski, B. Wahl, B. Lenhart, T. Blenckner & K. Teubner, 2006. Twenty years of spatially coherent deep-water warming in lakes across Europe related to North-Atlantic Oscillation. Limnology and Oceanography 51: 2787-2793.
28. Esu, D. & O. Girotti, 2001. The genus Prososthenia Neumayr in Italy (Gastropoda: Prosobranchia: Hydrobiidae). Bollettino della societa paleontologica italiana 40: 179-184.
29. Falkner, G., P. Obrdlik, E. Castella & M. C. D. Speight, 2001. Shelled Gastropoda of Western Europe. Verlag der Friedrich-Held-Gesellschaft, München.
30. Fastovsky, D. E., M. E. Arthur, N. H. Strater & A. Foss, 1993. Freshwater bivalves (Unionidae), disequilibrium isotopic fractionation, and temperature. Palaios 8: 602-608.
31. Gajurel, A. P., C. France-Lanord, P. Huyghe, C. Guilmette & D. Gurung, 2006. C and O isotope compositions of modern fresh-water mollusc shells and river waters from the Himalaya and Ganga plain. Chemical Geology 233: 156-183.
32. Geary, D. H., A. W. Staley, P. Müller & I. Magyar, 2002. Iterative changes in Lake Pannon Melanopsis reflect a recurrent theme in gastropod morphological evolution. Paleobiology 28: 208-221.
33. Geist, J., K. Auerswald & A. Boom, 2005. Stable carbon isotopes in freshwater mussel shells: environmental record or marker for metabolic acitivity? Geochimica et Cosmochimica Acta 69: 3545-3554.
34. Ghetti, P., P. Anadon, A. Bestini, D. Esu, E. Ghiozzi, L. Rook & I. Soulie-Marsche, 2002. The Early Messinian Velona basin (Siena, central Italy): paleoenvironmental and paleobiogeographical reconstructions. Palaeogeography, Palaeoclimatology, Palaeoecology 187: 1-33.
35. Gloer, P. & M. L. Zettler, 2007. Pseudamnicola beckmanni n. sp. und P. granjanis n. sp., zwei neue Art von den Balearen (Gastropoda: Hydrobiidae). In Beckmann, K.-H. (ed.), Die Land- und Süsswassermollusken der Balearischen Inseln. ConchBooks, Hackenhein: 171-174.
36. Gofas, S., 2010. Pseudamnicola anatina (Draparnaud). Accessed through: World Register of Marine Species at http://www. marinespecies. org/aphia. php?p=taxdetails&id=153974 on 2010-06-10.
37. Grafenstein, U. v., H. Erlenkeuser, J. Müller, P. Trimborn & J. Alefs, 1996. A 200-year mid-European air temperature record preserved in lake sediments: an extension of the air temperature-d18OP relation into the past. Geochimica et Cosmochimica Acta 60: 4025-4036.
38. Griffiths, H. I., J. M. Reed, M. J. Leng, S. Ryan & S. Petkovski, 2002. The recent palaeoecology and conservation status of Balkan Lake Dojran. Biological Conservation 104: 35-49.
39. Grossman, E. L. & T.-L. Ku, 1986. Oxygen and carbon isotope fractionation in biogenic aragonite: temperature effects. Chemical Geology 59: 59-74.
40. Hajek-Tadesse, V., M. Belak, J. Sremac, D. Vrsaljko & L. Wacha, 2009. Early Miocene ostracods from the Sadovi section (Mt Požeška gora, Croatia). Geologica Carpathica 60: 251-262.
41. Harzhauser, M. & O. Mandic, 2008. Neogene lake systems of Central and South-Eastern Europe: faunal diversity, gradients and interrelations. Palaeogeography, Palaeoclimatology, Palaeoecology 260: 417-434.
42. Harzhauser, M. & O. Mandic, 2010. Neogene dreissenids in Central Europe:evolutionary shifts and diversity changes, Chap. 2. In van der Velde, G., S. Rajagopal & A.Bij de Vaate (eds), The Zebra Mussel in Europe. Backhuys Publishers, Leiden/Margraf Publishers, Weikersheim: 11-29.
43. Harzhauser, M., T. Kowalke & O. Mandic, 2002. Late Miocene (Pannonian) gastropods of Lake Pannon with special emphasis on early ontogenetic development. Annalen des Naturhistorischen Museums Wien 103A: 75-141.
44. Harzhauser, M., C. Latal & W. E. Piller, 2007a. The stable isotope archive of Lake Pannon as a mirror of Late Miocene climate change. Palaeogeography, Palaeoclimatology, Palaeoecology 249: 335-350.
45. Harzhauser, M., W. E. Piller & C. Latal, 2007b. Geodynamic impact on the stable isotope signatures in a shallow epicontinental sea. Terra Nova 19: 1-7.
46. Hauffe, T., C. Albrecht, K. Schreiber, K. Birkhofer, S. Trajanovski & T. Wilke, 2010. Spatially explicit analyses of gastropod biodiversity in ancient Lake Ohrid. Biogeosciences Discussions 7: 4953-4985.
47. Heller, J. & A. Abotbol, 1997. Litter shredding in a desert oasis by the snail Melanopsis praemorsa. Hydrobiologia 344: 65-73.
48. Ivanović, A., V. Sikirica, S. Marković & K. Sakač, 1977. Osnovna geološka karta SFRJ. Drniš. 1: 100000. Savezni geološki zavod, Beograd.
49. Jiménez-Moreno, G., O. Mandic, M. Harzhauser, D. Pavelić & A. Vranjković, 2008. Vegetation and climate dynamics during the early Middle Miocene from Lake Sinj (Dinaride Lake System, SE Croatia). Review of Palaeobotany and Palynology 152: 237-245.
50. Jiménez-Moreno, G., A. de Leeuw, O. Mandic, M. Harzhauser, D. Pavelić, W. Krijgsman & A. Vranjković, 2009. Integrated stratigraphy of the early Miocene lacustrine deposits of Pag Island (SW Croatia): palaeovegetation and environmental changes in the Dinaride Lake System. Palaeogeography, Palaeoclimatology, Palaeoecology 280: 193-206.
51. Jokinen, E., 1992. The Freshwater Snails (Mollusca: Gastropoda) of New York State. The University of the State of New York, The State Education Department, The New York State Museum, Albany, New York: 1-112.
52. Jurišić-Polšak, Z., 1999. O Olujićevu dosada neobjavljenom radu. In Olujić, J. (ed.), O razvojnim nizovima nekoliko melanopsida i prozostenida iz sarmatskih naslaga okolice Sinja (Dalmacija, Hrvatska). Hrvatski prirodoslovni muzej Zagreb & Provincijalat Franjevacke provincije Presvetog otkupitelja Sinj, Zagreb: 89-112.
53. Jurišić-Polšak, Z., Z. Bajraktarević & S. Bahun, 1992. Spiridon Brusina's Miocene freshwater and Pleistocene marine fossile from Sinjsko polje. Natura Croatica 1: 19-26.
54. Kaandorp, R. J. G., H. B. Vonhof, C. Del Busto, F. P. Wesselingh, G. M. Ganssen, A. E. Marmól, L. Romero Pittman & J. E. van Hinte, 2003. Seasonal stable isotope variations of the modern Amazonian fresh water bivalve Anodontites trapesialis. Palaeogeography, Palaeoclimatology, Palaeoecology 194: 339-354.
55. Kaandorp, R. J. G., F. P. Wesselingh & H. B. Vonhof, 2005. Ecological implications from stable isotope records of Miocene western Amazonian bivalves. Journal of South American Earth Sciences 21: 54-74.
56. Kerner, F. v., 1905a. Gliederung der Sinjaner Neogen-formation. Verhandlungen der Geologischen Reichanstalt 1905: 127-165.
57. Kerner, F. v., 1905b. Neogenpflanzen vom Nordrande des Sinjsko polje in Mitteldalmatien. Jahrbuch der k. k. Geologischen Reichanstalt 55: 593-612.
58. Kirkegaard, J., 2006. Life history, growth and production of Theodoxus fluviatilis in Lake Esrom, Denmark. Limnologica - Ecology and Management of Inland Waters 36: 26-41.
59. Kittl, E., 1895. Bericht über eine Reise in Norddalmatien und einem angrenzenden Theile Bosniens. Annalen des k. k. Naturhistorischen Hofmuseums 10: 91-96.
60. Korbar, T., 2009. Orogenic evolution of the External Dinarides in the NE Adriatic region: a model constrained by tectonostratigraphy of Upper Cretaceous to Paleogene carbonates. Earth-Science Reviews 96: 296-312.
61. Krstić, N., L. Savić, G. Jovanović & E. Bodor, 2003. Lower Miocene lakes of the Balkan Land. Acta Geologica Hungarica 46: 291-299.
62. Latal, C., W. E. Piller & M. Harzhauser, 2004. Paleoenvironmental reconstruction by stable isotopes of Middle Miocene gastropods of the Central Paratethys. Palaeogeography, Palaeoclimatology, Palaeoecology 211: 157-169.
63. Latal, C., W. E. Piller & M. Harzhauser, 2005. Small-scaled environmental changes: indications from stable isotopes of gastropods (Early Miocene, Korneuburg Basin, Austria). International Journal of Earth Sciences 95: 95-106.
64. Latal, C., W. E. Piller & M. Harzhauser, 2006. Shifts in oxygen and carbon isotope signals in marine molluscs from the Central Paratethys (Europe) around the Lower/Middle Miocene transition. Palaeogeography, Palaeoclimatology, Palaeoecology 231: 347-360.
65. Leng, M. & J. D. Marshall, 2004. Palaeoclimate interpretation of stable isotope data from lake sediment archives. Quaternary Science Reviews 23: 811-831.
66. Leng, M. J., I. Baneschi, G. Zanchetta, C. N. Jex, B. Wagner & H. Vogel, 2010. Late Quaternari palaeoenvieonmental reconstruction from Lakes Ohrid and Prespa (Macedonia/Albania border) using stable isotopes. Biogeosciences 7: 3109-3122.
67. Livingstone, D. M. & M. T. Dokulil, 2001. Eighty years of spatially coherent Austrian lake surface water temperatures and their relationship to regional air temperature and the North Atlantic Oscillation. Limnology and Oceanography 46: 1220-1227.
68. Lojen, S., T. Dolenec, B. Vokal, N. Cukrov, G. Mihelćić & W. Papesch, 2004. C and O stable isotope variability in recent freshwater carbonates (River Krka, Croatia). Sedimentology 51: 361-375.
69. Mandic, O., D. Pavelić, M. Harzhauser, J. Zupanič, D. Reischenbacher, R. F. Sachsenhofer, N. Tadej & A. Vranjković, 2009. Depositional history of the Miocene Lake Sinj (Dinaride Lake System, Croatia): a long-lived hard-water lake in a pull-apart tectonic setting. Journal of Paleolimnology 41: 431-452.
70. Mátyás, J., S. J. Burns, P. Müller & I. Magyar, 1996. What can stable isotopes say about salinity? An example from the late Miocene Pannonian Lake. Palaios 11: 31-39.
71. Matzinger, A., M. Jordanoski, E. Veljanoska-Sarafiloska, M. Sturm, B. Müller & A. Wüest, 2006. Is Lake Prespa jeopardizing the ecosystem of ancient Lake Ohrid? Hydrobiologia 553: 89-109.
72. McCombie, A. M., 1959. Some relations between air temperatures and the surface water temperature of lakes. Limnology and Oceanography 4: 252-258.
73. McConnaughey, T. A. & D. P. Gillikin, 2008. Carbon isotopes in mollusk shell carbonates. Geo-Marine Letters 28: 287-299.
74. Moreno, J. L., D. G. Angeler & J. De las Heras, 2010. Seasonal dynamics of macroinvertebrate communities in a semiarid saline spring stream with contrasting environmental conditions. Aquatic Ecology 44: 177-194.
75. Mosbrugger, V. & T. Utescher, 1997. The coexistence approach - a new method for quantitative reconstructions of teriary terrestrial paleoclimate data using plant fossils. Palaeogeoraphy, Palaeoclimatology, Palaeoecology 134: 61-86.
76. Neumayr, M., 1869. Beiträge zur Kenntniss fossiler Binnenfaunen. Jahrbuch der k. k. geologischen Reichsanstalt 1869: 355-382.
77. Neumayr, M., & C. M. Paul, 1875. Die Congerien- und Paludinenschichten Slavoniens und deren Faunen. Ein Beitrag zur Descendenz-Theorie. Abhandlungen der k. k. geologischen Reichsanstalt 7: 1-111.
78. Papeš, J., R. Marinković, V. Raić, N. Magaš & V. Sikirica, 1984. Osnovna geološka karta SFRJ. Sinj. 1: 100000, (Savezni geološki zavod) Beograd.
79. Popov, S. V., F. Rögl, A. Y. Rozanov, F. F. Steininger, I. G. Shcherba & M. Kováč, 2004. Lithological-paleogeographic maps of Paratethys. 10 maps late Eocene to Pliocene. Courier Forschungsinstitut Senckenberg 250: 1-46.
80. Raić, V., J. Papeš, V. Sikirica & N. Magaš, 1984. Tumač za list Sinj K 33-10. Osnovna geološka karta SFRJ 1: 100000 (Savezni geološki zavod) Beograd: 1-48.
81. Reinhardt, E. G., R. J. Fitton & H. P. Schwarcz, 2003. Isotopic (Sr, O, C) indicators of salinity and taphonomy in marginal marine settings. Journal of Foraminiferal Research 33: 262-272.
82. Ricken, W., T. Steuber, H. Freitag, M. Hirschfeld & B. Niedenzu, 2003. Recent and historical discharge of a large European river system - oxygen isotopic composition of river water and skeletal aragonite of Unionidae in the Rhine. Palaeogeography, Palaeoclimatology, Palaeoecology 193: 73-86.
83. Rögl, F., 1998. Palaeogeographic considerations for Mediterranean and Paratethys Seaways (Oligocene to Miocene). Annalen des Naturhistorischen Museums in Wien 99: 279-310.
84. Sandberger, F., 1874. Die Land-und Süßwasser-Conchylien der Vorwelt. Kreidel, Wiesbaden: 353-616.
85. Schmid, S. M., D. Bernoulli, B. Fügenschuh, L. Matenco, S. Schefer, R. Schuster, M. Tischler & K. Ustaszewski, 2008. The Alpine-Carpathian-Dinaridic orogenic system: correlation and evolution of tectonic units. Swiss Journal of Geosciences 101: 139-183.
86. Schütt, H., 2000. Die Höhlenmollusken der Ombla-Quelle (The subterranean molluscs of the Ombla spring). Natura Croatica 9: 203-215.
87. Sharma, S., S. C. Walker & D. A. Jackson, 2008. Empirical modelling of lake water-temperature relationships: a comparison of approaches. Freshwater Biology 53: 897-911.
88. Staal, M. J., R. Thar, M. Kühl, M. C. M. van Loosdrecht, G. Wolf, J. F. C. De Brouwer & J. W. Rijstenbil, 2007. Different carbon isotope fractionation in developing natural phototrophic biofilms. Biogeosciences 4: 613-626.
89. Šušnjara, A. & K. Sakač, 1988. Miocenski slatkovodni sedimenti područja Sinja u srednjoj Dalmaciji (Miocene freshwater sediments of the Sinj area - Middle Dalmatia). Geološki vjesnik 41: 51-74.
90. Symanowski, F. & J.-P. Hildebrandt, 2010. Differences in osmotolerance in freshwater and brackish water populations of Theodoxus fluviatilis (Gastropoda: Neritidae) are associated with differential protein expression. Journal of Comparative Physiology B 180: 337-346.
91. Szarowska, M., A. Falniowski, F. Riedel & T. Wilke, 2005. Phylogenetic relationships of the subfamily Pyrgulinae (Gastropoda: Caenogastropoda: Hydrobiidae) with emphasis on the genus Dianella Gude, 1913. Zootaxa 891: 1-32.
92. Tari, V., 2002. Evolution of the northern and western Dinarides: a tectonostratigraphic approach. EGU Stephan Mueller Special Publication Series 1: 223-236.
93. Trajanovski, S., C. Albrecht, K. Schreiber, R. Schultheiß, T. Stadler, M. Benke & T. Wilke, 2010. Testing the spatial and temporal framework of speciation in an ancient lake species flock: the leech genus Dina (Hirudinea: Erpobdellidae) in Lake Ohrid. Biogeosciences Discussions 7: 5011-5045.
94. Vonhof, H. B., F. P. Wesselingh, R. J. G. Kaandorp, G. R. Davies, J. E. van Hinte, J. Guerrero, M. M. Räsänen, L. Romero-Pittman & A. Ranzi, 2003. Paleogeography of Miocene Western Amazonia: isotopic composition of molluscan shells constrains the influence of marine incursions. Geological Society of America Bulletin 115: 983-993.
95. Wurster, C. M. & W. P. Patterson, 2001. Seasonal variation in stable oxygen and carbon isotope values recovered from modern lacustrine freshwater molluscs: paleoclimatological implications for sub-weekly temperature records. Journal of Paleolimnology 26: 205-218.