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T9 Peatland development in Amazonia: palaeobotanical and stratigraphic evidence T.J. Kelly 1 *, I.T. Lawson 1 , K.H. Roucoux 1 , and T. R. Baker 1 . 1 School of Geography, University of Leeds, Leeds Amazonian floodplains occupy around 800,000 km 2 , with forested wetlands constituting a significant proportion of the lowland Amazon (c. 30%; Junk et al., 2013), yet we know very little about their palaeoecological history. The discovery of large peatland areas in northeast Peru (Lähteenoja et al., 2009) has brought to light a new archive of information in the Amazonian lowlands which can be used to improve our knowledge of these systems. This study aims to use pollen analysis to investigate the causes of vegetation change in a tropical peatland in Peru (Quistococha) over the last 5,000 years. Together with an existing peatland pollen record (see Roucoux et al., 2013), we have studied a lake core, and a further four peat cores from across the site; this is therefore one of the most comprehensive multi-core pollen studies of any tropical wetland. Comparison of our lake record with the peatland pollen data reveals some important differences in the pattern and timing of vegetation development recorded in each depositional environment. Whilst several vegetation changes are recorded at the same time in both cores (e.g. a decline in the secondary growth tree Cecropia which directly precedes peat initiation), in the lake record Mauritia type pollen becomes abundant c. 750 years before the increase is recorded in the peatland. The pollen source area of each peat core is likely to be smaller than that of the lake core due to the presence of closed canopy forest on the peat for much of its history. The difference in timing between the two depositional environments probably reflects differences in the timing of palm swamp expansion in the peatland and the wider floodplain. Vegetation changes in the five peatland records show some strong similarities. This suggests that a single core taken from the deepest point can indeed represent the main vegetation changes through time for a given site. However, the additional four peatland records have also revealed several past vegetation phases, including a one with abundant Ficus, a Symmeria paniculata phase, and a Euterpe-type palm phase, not recorded in the original core (cf. Roucoux et al., 2013). Thus, the additional cores have added useful spatial detail which can help when inferring developmental drivers. Keywords: peat; pollen; palm swamp; wetland; aguajal Junk WJ, Piedade MTF, Lourival R, Wittmann F, Kandus P, Lacerda LD, Bozelli RL, Esteves FA, Nunes da Cunha C, Maltchik L, Schongart J, Schaeffer-Novelli Y, and Agostinho AA (2013) Brazilian wetlands: their definition, delineation, and classification for research, sustainable management, and protection. Aquatic Conserv: Mar. Freshw. Ecosyst. DOI: 10.1002/aqc.2386 Lähteenoja O, Ruokolainen K, Schulman L and Oinonen M (2009) Amazonian peatlands: an ignored C sink and potential source. Global Change Biology 15: 2311-2320. Roucoux KH, Lawson IT, Jones TD, Baker TR, Coronado EN, Gosling WD and Lähteenoja O (2013) Vegetation development in an Amazonian peatland. Palaeogeography, Palaeoclimatology, Palaeoecology 374: 242-255.
Figure 1: The palm swamp forest at Quistococha. Three species dominate the vegetation at this site: Tabebuia insignis Sandwith and the palms Mauritia flexuosa L. and Mauritiella armata (Mart.) Burrett together represent 82% of the individuals.
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QRA@50: Quaternary Revolutions QRA
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Conference Programme Wednesday 8th
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General Notes Exhibitors A small nu
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QRA50: Top 50 UK Quaternary Sites N
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THEME 1: CAUSES OF CLIMATE CHANGE C
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THEME 2: MEASURING TIME Radiocarbon
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THEME 3: MEASURING AND UNDERSTANDIN
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THEME 4: MODELLING THE EARTH SYSTEM
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modeling context, or in the context
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THEME 5: ICE SHEET DYNAMICS Time, t
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THEME 7: THE OCEANS The Oceans, CO
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THEME 8: TERRESTRIAL STRATIGRAPHY A
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THEME 9: PALAEOECOLOGY Conservation
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THEME 9: PALAEOECOLOGY Beetles, bon
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THEME 10: HUMAN ORIGINS, ENVIRONMEN
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THEME 11: INSIGHTS FROM GENETICS In
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Van Walt m onitoring your needs Del
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T2 TRACEing Tephra Horizons in Nort
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T5 The Hebrides Ice Stream (HIS) an
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T9 Formation and Cultural Use of We
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T3 Glacier-based climate reconstruc
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T5 Reconstructing the maximum exten
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Page 151 and 152: T3 The temperature-δ 18 O relation
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T10 Neolithic land-use change clima
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T5 Assessing existing dating constr
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T10 Assessing the effects of the '2
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T5 Increased channelization of subg
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T7 Holocene controls on silicic aci
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T8 Tanera Mor: a new stratotype for
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T8 Landscape response to abrupt cli
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T9 Impact of vegetation shifts on i
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T9 Assessing seasonality changes du
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T2 Cryptotephra records as archives
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Westaway, R., Bridgland, D.R., Mish
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T3 Songs from the wood: tales of th
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T9 Lateglacial and Holocene Climate
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