NDLI: Holocene development and anthropogenic disturbance of a shallow lake system in Central Ireland recorded by diatoms

Content Provider	Springer Nature Link
Author	Selby, K. A. Brown, A. G.
Copyright Year	2007
Abstract	Three cores from two connected lakes in Central Ireland (Lough Kinale and Derragh Lough) were investigated using diatom analysis to establish the Holocene development of the lacustrine system, any local variations within the lakes and any anthropogenic influences. The study area was situated in a lowland location and the lakes were shallow, unstratified and interconnected. Litho-and bio-stratigraphical analyses of the lake cores and deposits beneath a mire separating the two lakes showed the changing spatial configuration of the lake system in the early Holocene and the separation of the initial lake into three basins (cf. lacustrine cells) and finally into two interlinked lakes. The evolution of the lake system is conceptualised as the development of distinct lacustrine cells, and its sediments have recorded changes in the physical (geography, depth and sedimentation) and chemical (water chemistry) properties of the lakes inferred through diatom analyses. The longest sequence, from the early Holocene, records fluctuating lake levels and these are correlated with geomorphological mapping and surveying of palaeoshorelines. The diatom assemblages of the upper 2 m of the three cores, covering approximately the last 2000–3000 radiocarbon years show considerable difference in trophic status and life-form categories. This is related to the location of the cores in the lake and also the distance from human settlement with particular reference to proximity to crannog (artificial island) construction and use. The most central core from the deepest part of Lough Kinale has the least representation of the human settlement and agricultural activity in the catchment and on the fringes of the lake, whereas the core taken from the edge of a crannog is able to identify when construction and use of the crannog occurred. The local nature of the palaeoecological response to human activity due to incomplete water mixing has the advantage of allowing the lake sediment cores to be used to determine spatially discrete settlement patterns.
Starting Page	419
Ending Page	440
Page Count	22
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	38
Issue Number	3
e-ISSN	15730417
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-01-19
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Shallow lakes Diatoms Holocene Trophic status changes Human impact Crannogs Multiple cores Geology Hydrobiology Physical Geography Climate Change Sedimentology Environment
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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