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Diurnal and monthly vertical profiles of benthic microalgae within intertidal sediments from two temperate localities
Citation
Jordan, L and McMinn, A and Wotherspoon, SJ, Diurnal and monthly vertical profiles of benthic microalgae within intertidal sediments from two temperate localities, Marine and Freshwater Research, 59, (10) pp. 931-939. ISSN 1323-1650 (2008) [Refereed Article]
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Copyright Statement
Copyright © 2008 CSIRO
Official URL: http://www.publish.csiro.au/
DOI: doi:10.1071/MF07105
Abstract
Intertidal areas supporting microphytobenthos (MPB) are dynamic with changes in light intensity over short
(tidal) and long (seasonal) time scales.The ability ofMPBto migrate away from or towards the sediment surface to optimise
sunlight is one reason they are so successful in intertidal areas. Over 12 months, we investigated the effects of time of day
on the migration of benthic diatoms at two sites near Hobart, Tasmania, using a pulse amplitude modulation fluorometer
to measure chlorophyll fluorescence. Chlorophyll a content and maximum quantum yield (FV/FM) were used to examine
profiles of microalgal biomass within sediment cores. There was a seasonal pattern of chlorophyll a biofilm development,
peaking in summer at the sandy site, Pipe Clay Lagoon, and in spring at the muddier Browns River. The muddier site had
an overall greater MPB biomass than the sandy site. The FV/FM values demonstrated that cells were more ‘stressed’ at
midday when sunlight was highest. However, significant seasonal variation was only observed at Browns River. Vertical
migration through the sediment was not evident. It seems that the MPB at these two sites are using photoadaptive strategies
along with small-scale vertical migration below the detection limit of the methods used in the present study.
Item Details
Item Type: | Refereed Article |
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Keywords: | chlorophyll, fluorometer, maximum quantum yield |
Research Division: | Biological Sciences |
Research Group: | Ecology |
Research Field: | Marine and estuarine ecology (incl. marine ichthyology) |
Objective Division: | Environmental Management |
Objective Group: | Other environmental management |
Objective Field: | Other environmental management not elsewhere classified |
UTAS Author: | Jordan, L (Ms Leonie McCrossen) |
UTAS Author: | McMinn, A (Professor Andrew McMinn) |
UTAS Author: | Wotherspoon, SJ (Dr Simon Wotherspoon) |
ID Code: | 54367 |
Year Published: | 2008 |
Web of Science® Times Cited: | 5 |
Deposited By: | IASOS |
Deposited On: | 2009-02-18 |
Last Modified: | 2012-04-30 |
Downloads: | 0 |
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