Flushing of dense, hypoxic water from a cavity of the Swan River estuary, Western Australia

Kurup, Rajendra G.; Hamilton, David P.

doi:10.1007/bf02691339

Cited by 36 publications

(25 citation statements)

References 25 publications

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“…Tides can disrupt stratification (Dyer 1997), but flushing within canals is reduced with increased depth, increased length, and bathymetry features (U.S. Environmental Protection Agency 1975; Luther et al 2004). Localized stratification behind sills and in holes can be especially resistant to flushing (Kurup and Hamilton 2002;Luther et al 2004), and even where bottom topography is smooth, stratification can persist in the face of large tides (Dyer 1997).…”

Section: Discussionmentioning

confidence: 99%

Temperature Inverted Haloclines Provide Winter Warm-Water Refugia for Manatees in Southwest Florida

Stith

Reid

Langtimm

et al. 2010

Estuaries and Coasts

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Florida manatees (Trichechus manatus latirostris) overwintering in the Ten Thousand Islands and western Everglades have no access to power plants or major artesian springs that provide warm-water refugia in other parts of Florida. Instead, hundreds of manatees aggregate at artificial canals, basins, and natural deep water sites that act as passive thermal refugia (PTR). Monitoring at two canal sites revealed temperature inverted haloclines, which provided warm salty bottom layers that generally remained above temperatures considered adverse for manatees. At the largest PTR, the warmer bottom layer disappeared unless significant salt stratification was maintained by upstream freshwater inflow over a persistent tidal wedge. A detailed threedimensional hydrology model showed that salinity stratification inhibited vertical convection induced by atmospheric cooling. Management or creation of temperature inverted haloclines may be a feasible and desirable option for resource managers to provide passive thermal refugia for manatees and other temperature sensitive aquatic species.

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Section: Discussionmentioning

confidence: 99%

Temperature Inverted Haloclines Provide Winter Warm-Water Refugia for Manatees in Southwest Florida

Stith

Reid

Langtimm

et al. 2010

Estuaries and Coasts

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“…For comparison, the rate of deoxygenation obtained for several rivers in other countries are as follows [11][12][13]:…”

Section: Slope Methods Introduced By Thomasmentioning

confidence: 99%

The deoxygenation rate determination based on physical condition of river body, case study of Citepus River

Yustiani¹,

Mulyatna²,

Pranata³

2013

AIP Conference Proceedings

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Articles you may be interested inGround and river water quality monitoring using a smartphone-based pH sensor AIP Advances 5, 057151 (2015); 10.1063/1.4921835The Langat River water quality index based on principal component analysis AIP Conf.Abstract. The rate of deoxygenation is one important parameter in the calculation of river water quality. Deoxygenation process itself can be a general characteristic of the river in the perspective of its biological activity, i.e. the uptake of oxygen by microorganisms in performing the decomposition process. Determination of the rate of deoxygenation is usually performed in the laboratory by carry out incubation and analysis on the sample of water for 10-20 days. However, to obtain the rate of deoxygenation with a shorter time, the physical condition of the river can be used in several equations proposed by Hydroscience. These equations utilize the physical condition of the river body, i.e. water depth, for the calculation of deoxygenation rate. In this study, the results of these empirical equations for the value of the rate of deoxygenation were compared to the results of laboratory analysis for Citepus River. Based on the laboratory analysis, the deoxygenation rate was highly varied around 0.06 to 0.48 per day, whereas the result of the empirical equation calculation shows numbers that are not too varied, i.e. 0.42 to 0.64 per day. In this case, the highest value of deoxygenation rate resulted from laboratory analysis similar to the lowest value of calculation using Hydroscience equation.

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“…The bloom was initially located over a patch of hypoxic bottom water that stretched from above the 35 km station to the 25 km station (Fig. 5E), environmental conditions that are not uncommon in this portion of the SRE (Stephens and Imberger, 1996; Thompson, 1998; Hamilton et al, 2001) associated with strong salinity stratification (Kurup and Hamilton, 2002) and elevated inorganic nutrient availability (Hamilton et al, 1999). Although not specifically addressed in this study, the ability of K. veneficum to undergo vertical migrations (sensu Hall and Paerl, 2011) may give this species an advantage over other forms in the stratified upper SRE environment, although this would not explain the differential success of K. veneficum over other flagellates capable of vertical migrations.…”

Section: Discussionmentioning

confidence: 99%

“…Hypoxia ranks with HAB as a global symptom of ecosystem decline (Cloern, 2001; Kemp et al, 2005; Diaz and Rosenberg, 2008) and can co-occur spatially and temporally with HAB, including Karlodinium veneficum (Hall et al, 2008). Hypoxic or anoxic conditions are common in the upper SRE (Stephens and Imberger, 1996; Hamilton et al, 2001), associated with water column stratification (Kurup and Hamilton, 2002). Further, night time oxygen levels were likely lower than the daytime values that were measured, potentially increasing their role in this fish kill.…”

Section: Discussionmentioning

confidence: 99%

Ichthyotoxic Karlodinium veneficum (Ballantine) J Larsen in the Upper Swan River Estuary (Western Australia): Ecological conditions leading to a fish kill

et al. 2015

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Ichthyotoxic Karlodinium veneficum has become a persistent problem in the eutrophic Swan River Estuary (SRE) near Perth, Western Australia. Karlotoxin (KmTx) concentrations and K. veneficum were sampled from March to July 2005, spanning a bloom confirmed by microscopy and genetics (ITS sequence), and a fish kill coincident with end of the bloom. The objective of this study was to investigate K. veneficum cell and toxin dynamics, and water quality conditions, leading up to the bloom and fish kill in this estuarine system. Abundance of K. veneficum increased as diatom abundance decreased over a 3-month period (Jan-Mar) preceding the bloom. Low freshwater flow to the SRE characterized the bloom initiation period, while elevated seasonal flows altered water quality and preceded the end of the bloom and fish kill. The bloom of K. veneficum was localized over a bottom layer of hypoxic water in a stratified water column. Low nitrate levels, DIN:DIP (mol) near unity, and particulate C:N:P of K. veneficum-rich water samples were consistent with nitrogen limitation of phytoplankton. A KmTx 2 congener was present in the concentration range 0–1052 ng KmTx mL−1, levels that were sufficient to kill larval fish in the laboratory within 4 h. A KmTx cell quota of 2.8 pg KmTx cell−1 was estimated for the bloom, which is moderately high for the species. Gill histopathology of fish from this fish kill showed signs of damage similar to those caused by KmTx in the lab. Results from this study suggest that conditions in the SRE, including elevated K. veneficum abundance and KmTx cell quotas, as well as hypoxia in the upper SRE, likely contribute to seasonal fish kills observed in this system.

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Flushing of dense, hypoxic water from a cavity of the Swan River estuary, Western Australia

Cited by 36 publications

References 25 publications

Temperature Inverted Haloclines Provide Winter Warm-Water Refugia for Manatees in Southwest Florida

Temperature Inverted Haloclines Provide Winter Warm-Water Refugia for Manatees in Southwest Florida

The deoxygenation rate determination based on physical condition of river body, case study of Citepus River

Ichthyotoxic Karlodinium veneficum (Ballantine) J Larsen in the Upper Swan River Estuary (Western Australia): Ecological conditions leading to a fish kill

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