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Lake evolution in a semi-arid montane environment: response to catchment change and hydroclimatic variation

Lamb, H. and Roberts, N. and Leng, M. and Barker, P. and Benkaddour, A. and van der Kaars, S. (1999) Lake evolution in a semi-arid montane environment: response to catchment change and hydroclimatic variation. Journal of Paleolimnology, 21 (3). pp. 325-343. ISSN 0921-2728

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Abstract

Pollen, geochemical and sedimentological data from Sidi Ali, a montane Moroccan lake, provide a 7000 yr record of changes in climate, catchment vegetation and soil erosion intensity. Diatoms, non-silicious algae, macrophyte fossils and ostracods from the same core record the dynamics of the lake ecosystem. Oxygen isotope and trace-element ratios of benthic ostracods appear to be relatively insensitive to climatic variation in this open lake with low water-residence time, but diatom plankton / periphyton (P/L) ratios show lake-level variations that are probably climate controlled. At least two superimposed processes are recorded, but at different timescales: catchment vegetation and soils show long-term changes due to climate and human impact, whereas P/L ratios suggest century-scale oscillations in lake depth. The timing of changes in algal and macrophyte productivity and carbon cycling within the lake broadly corresponds to changes in terrestrial vegetation, suggesting either that lake nutrient status is linked to catchment vegetation and soils, or that both were influenced by climate. The lack of a sensitive and independent (non-biological) climate proxy makes it more difficult to assess the lake''s ecological response to short-term climate variation. Overall, the lake''s evolution has been influenced both by catchment-mediated nutrient flux and by changes in water balance, thus having characteristics in common with both temperate and arid zone lakes.

Item Type: Article
Journal or Publication Title: Journal of Paleolimnology
Additional Information: Mar Lake evolution in a semi-arid montane environment: response to catchment change and hydroclimatic variation Times Cited: 16
Uncontrolled Keywords: pollen ; diatoms ; algae ; ostracods ; stable isotopes ; palaeolimnology ; Holocene ; Morocco
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 53054
Deposited By: ep_importer_pure
Deposited On: 20 Mar 2012 01:19
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 23:13
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/53054

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