Major disturbance to aquatic ecosystems in the South Island, New Zealand, following human settlement in the Late Holocene

Woodward, Craig, Shulmeister, James, Zawadzki, Atun and Jacobsen, Geraldine (2014) Major disturbance to aquatic ecosystems in the South Island, New Zealand, following human settlement in the Late Holocene. Holocene, 24 6: 668-678. doi:10.1177/0959683614526935


Author Woodward, Craig
Shulmeister, James
Zawadzki, Atun
Jacobsen, Geraldine
Title Major disturbance to aquatic ecosystems in the South Island, New Zealand, following human settlement in the Late Holocene
Journal name Holocene   Check publisher's open access policy
ISSN 1477-0911
0959-6836
Publication date 2014-06-01
Year available 2014
Sub-type Article (original research)
DOI 10.1177/0959683614526935
Volume 24
Issue 6
Start page 668
End page 678
Total pages 11
Place of publication London, United Kingdom
Publisher Sage Publications
Language eng
Abstract Lake sediment records from three lakes in the South Island of New Zealand were examined to determine the effects of human (Māori and European) impacts on the lake catchments during the Late Holocene. Major changes in lake biota occurred in the Early to Middle Holocene (11,000-6000 cal. yr BP), but there were no major changes between c. 6000 cal. yr BP and the time of human impact. Intensive Māori forest clearance occurred here between c.ad 1200 and 1600, which is consistent with other New Zealand records. Catchment erosion and increased sedimentation probably occurred in all of the studied lakes, but the most obvious changes occurred in Lake Clearwater and the Māori Lakes. There was evidence for gravity-induced slumping of the littoral sediments in Lake Clearwater due to increased sediment loading, and the outflow from the Māori Lakes was blocked by a migrating alluvial fan. The erosion of sediment (and nutrients) from the lake catchments led to eutrophication, but increases in lake depth were just as important in two of the lakes. Increased water depth was caused by damming of the Māori lakes outflow by a migrating alluvial fan. Reduced evapotranspiration following deforestation would also have led to increased water yield in lake catchments. European impacts were minor compared with the impacts of Māori deforestation, and all lakes display different levels of recovery towards pre-human impact conditions. Complete recovery is prevented by permanent changes in catchment hydrology and probable internal feedback mechanism such as wind-induced sediment re-suspension in the larger lakes.
Keyword Chironomid
Deforestation
Holocene
Human impact
Lake
New Zealand
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Geography, Planning and Environmental Management Publications
Official 2015 Collection
 
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