Nutrient and plankton dynamics in an intermittently closed/open lagoon, Smiths Lake, south-eastern Australia: An ecological model

Everett, JD; Baird, ME; Suthers, IM

Nutrient and plankton dynamics in an intermittently closed/open lagoon, Smiths Lake, south-eastern Australia: An ecological model

Everett, JD

Baird, ME

Suthers, IM

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Publication Type:: Journal Article
Citation:: Estuarine, Coastal and Shelf Science, 2007, 72 (4), pp. 690 - 702
Issue Date:: 2007-05-01

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Field	Value	Language
dc.contributor.author	Everett, JD https://orcid.org/0000-0002-6681-8054	en_US
dc.contributor.author	Baird, ME https://orcid.org/0000-0003-4955-2298	en_US
dc.contributor.author	Suthers, IM	en_US
dc.date.issued	2007-05-01	en_US
dc.identifier.citation	Estuarine, Coastal and Shelf Science, 2007, 72 (4), pp. 690 - 702	en_US
dc.identifier.issn	0272-7714	en_US
dc.identifier.uri	http://hdl.handle.net/10453/13158
dc.description.abstract	A spatially resolved, eleven-box ecological model is presented for an Intermittently Closed and Open Lake or Lagoon (ICOLL), configured for Smiths Lake, NSW Australia. ICOLLs are characterised by low flow from the catchment and a dynamic sand bar blocking oceanic exchange, which creates two distinct phases - open and closed. The process descriptions in the ecological model are based on a combination of physical and physiological limits to the processes of nutrient uptake, light capture by phytoplankton and predator-prey interactions. An inverse model is used to calculate mixing coefficients from salinity observations. When compared to field data, the ecological model obtains a fit for salinity, nitrogen, phosphorus, chlorophyll a and zooplankton which is within 1.5 standard deviations of the mean of the field data. Simulations show that nutrient limitation (nitrogen and phosphorus) is the dominant factor limiting growth of the autotrophic state variables during both the open and closed phases of the lake. The model is characterised by strong oscillations in phytoplankton and zooplankton abundance, typical of predator-prey cycles. There is an increase in the productivity of phytoplankton and zooplankton during the open phase. This increased productivity is exported out of the lagoon with a net nitrogen export from water column variables of 489 and 2012 mol N d-1 during the two studied openings. The model is found to be most sensitive to the mortality and feeding efficiency of zooplankton. © 2006 Elsevier Ltd. All rights reserved.	en_US
dc.relation.ispartof	Estuarine, Coastal and Shelf Science	en_US
dc.relation.isbasedon	10.1016/j.ecss.2006.12.001	en_US
dc.subject.classification	Marine Biology & Hydrobiology	en_US
dc.title	Nutrient and plankton dynamics in an intermittently closed/open lagoon, Smiths Lake, south-eastern Australia: An ecological model	en_US
dc.type	Journal Article
utslib.citation.volume	4	en_US
utslib.citation.volume	72	en_US
utslib.for	0602 Ecology	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
utslib.copyright.status	closed_access
pubs.issue	4	en_US
pubs.publication-status	Published	en_US
pubs.volume	72	en_US

Abstract:

A spatially resolved, eleven-box ecological model is presented for an Intermittently Closed and Open Lake or Lagoon (ICOLL), configured for Smiths Lake, NSW Australia. ICOLLs are characterised by low flow from the catchment and a dynamic sand bar blocking oceanic exchange, which creates two distinct phases - open and closed. The process descriptions in the ecological model are based on a combination of physical and physiological limits to the processes of nutrient uptake, light capture by phytoplankton and predator-prey interactions. An inverse model is used to calculate mixing coefficients from salinity observations. When compared to field data, the ecological model obtains a fit for salinity, nitrogen, phosphorus, chlorophyll a and zooplankton which is within 1.5 standard deviations of the mean of the field data. Simulations show that nutrient limitation (nitrogen and phosphorus) is the dominant factor limiting growth of the autotrophic state variables during both the open and closed phases of the lake. The model is characterised by strong oscillations in phytoplankton and zooplankton abundance, typical of predator-prey cycles. There is an increase in the productivity of phytoplankton and zooplankton during the open phase. This increased productivity is exported out of the lagoon with a net nitrogen export from water column variables of 489 and 2012 mol N d-1 during the two studied openings. The model is found to be most sensitive to the mortality and feeding efficiency of zooplankton. © 2006 Elsevier Ltd. All rights reserved.

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http://hdl.handle.net/10453/13158