Vertical distributions of chlorophyll in deep, warm monomictic lakes

Hamilton, David P., O'Brien, Katherine R., Burford, Michele A., Brookes, Justin D. and McBride, Chris G. (2010) Vertical distributions of chlorophyll in deep, warm monomictic lakes. Aquatic Sciences, 72 3: 295-307. doi:10.1007/s00027-010-0131-1

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Author Hamilton, David P.
O'Brien, Katherine R.
Burford, Michele A.
Brookes, Justin D.
McBride, Chris G.
Title Vertical distributions of chlorophyll in deep, warm monomictic lakes
Journal name Aquatic Sciences   Check publisher's open access policy
ISSN 1015-1621
Publication date 2010-06
Sub-type Article (original research)
DOI 10.1007/s00027-010-0131-1
Volume 72
Issue 3
Start page 295
End page 307
Total pages 13
Editor Klement Tockner
Place of publication Basel, Switzerland ; Boston, U.S.A.
Publisher Birkhäuser
Collection year 2011
Language eng
Formatted abstract
The factors affecting vertical distributions of chlorophyll fluorescence were examined in four temperate, warm monomictic lakes. Each of the lakes (maximum depth >80 m) was sampled over 2 years at intervals from monthly to seasonal. Profiles were taken of chlorophyll fluorescence (as a proxy for algal biomass), temperature and irradiance, as well as integrated samples from the surface mixed layer for chlorophyll a (chl a) and nutrient concentrations in each lake. Depth profiles of chlorophyll fluorescence were also made along transects of the longest axis of each lake. Chlorophyll fluorescence maxima occurred at depths closely correlated with euphotic depth (r2 = 0.67, P < 0.01), which varied with nutrient status of the lakes. While seasonal thermal density stratification is a prerequisite for the existence of a deep chlorophyll maximum (DCM), our study provides evidence that the depth of light penetration largely dictates the DCM depth during stratification. Reduction in water clarity through eutrophication can cause a shift in phytoplankton distributions from a DCM in spring or summer to a surface chlorophyll maximum within the surface mixed layer when the depth of the euphotic zone (zeu) is consistently shallower than the depth of the surface mixed layer (zSML). Trophic status has a key role in determining vertical distributions of chlorophyll in the four lakes, but does not appear to disrupt the annual cycle of maximum chlorophyll in winter.
© 2010 Springer Basel AG.
Keyword Deep chlorophyll maximum
Non-photochemical quenching
Rotorua lakes
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2011 Collection
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Citation counts: TR Web of Science Citation Count  Cited 16 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 19 times in Scopus Article | Citations
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Created: Wed, 08 Dec 2010, 16:27:08 EST by Dr Kate O'brien on behalf of School of Chemical Engineering