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Type: Journal article
Title: Vertical distributions of chlorophyll in deep, warm monomictic lakes
Author: Hamilton, D.
O'Brien, K.
Burford, M.
Brookes, J.
McBride, C.
Citation: Aquatic Sciences, 2010; 72(3):295-307
Publisher: Birkhauser Verlag Ag
Issue Date: 2010
ISSN: 1015-1621
Statement of
David P. Hamilton, Katherine R. O’Brien, Michele A. Burford, Justin D. Brookes and Chris G. McBride
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 (r 2 = 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 (z eu) is consistently shallower than the depth of the surface mixed layer (z SML). 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.
Keywords: Phytoplankton; Deep chlorophyll maximum; Rotorua lakes; Fluorescence; Non-photochemical quenching
Rights: © Springer Basel AG 2010
RMID: 0020095437
DOI: 10.1007/s00027-010-0131-1
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute Leaders publications

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