An ecological investigation of the Myall Lakes region

Atkinson, G.; P.A, Hutchings; Johnson, Merike; W.D, Johnson; Melville,

doi:10.1111/j.1442-9993.1981.tb01580.x

Cited by 19 publications

(14 citation statements)

References 18 publications

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“…This may vary from semi-permanent connections to the sea (sites 5 and 6 ; Atkinson et al, 1981) to infrequent incursions of seawater. Pond B of this study may be an example of the latter, showing a higher total ionic concentration relative to nearby ponds further from the sea .…”

Section: Discussion and Interpretationmentioning

confidence: 99%

“…This is a broad category and includes the influence of soil type as seen in this study and fluctuations in stream input or output (site 8 ; Timms, 1973) . Some of the coastal Myall lakes studied by Atkinson et al (1981) are filled by river water, and lake chemistry is closely related to river chemistry. The nature of the surrounding vegetation can also be important, as illustrated by the input into dune lakes of colored acids leached from nearby swamps (Timms, 1973 ;Alderdice et al, 1978), or by ion scavenging or release in the littoral or pelagic zone (Banoub 1975 ;Gaudet & Denny, 1981) .…”

Section: Discussion and Interpretationmentioning

confidence: 99%

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The physicochemistry of some dune ponds on the Outer Banks, North Carolina

Kling

1986

Hydrobiologia

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A survey of the chemical composition of five coastal dune ponds on the Outer Banks, North Carolina, showed the ponds to be more similar to underlying groundwater than to dilute seawater or average river water. With a mean total ionic content of 3 .14 mmol 1 -1 the ponds were decidedly fresh . Variations in chemistry between the ponds resulted from physiographic association with leached or unleached dunes, and from different soil types in the pond basins . Near isothermal conditions were found in all but one pond . Oxygen levels were reduced at depth in every pond (10 to 25 0 'o saturation) . Comparative data show the influences on major ion chemistry in these ponds to be substantially different from those of some other coastal dune waters .

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Section: Discussion and Interpretationmentioning

confidence: 99%

Section: Discussion and Interpretationmentioning

confidence: 99%

The physicochemistry of some dune ponds on the Outer Banks, North Carolina

Kling

1986

Hydrobiologia

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“…The remainder is relatively undisturbed vegetation within either state forest, national park or uncleared private land holdings (Atkinson et al, 1981). The BB is approximately 22 km 2 in size (Fig.…”

Section: Study Areamentioning

confidence: 99%

Biogeochemical processes at the sediment–water interface, Bombah Broadwater, Myall Lakes

et al. 2008

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Myall Lakes has experienced algal blooms in recent years which threaten water quality. Biomarkers, benthic fluxes measured with chambers, and pore water metabolites were used to identify the nature and reactivity of organic matter (OM) in the sediments of Bombah Broadwater (BB), and the processes controlling sediment-nutrient release into the overlying waters. The OM in the sediments was principally from algal sources although terrestrial OM was found near the Myall River. Terrestrial faecal matter was identified in muddy sediments and was probably sourced via runoff from farm lands. The reactive OM which released nutrients into the overlying waters was from diatoms, dinoflagellates and probably cyanobacteria. Microcystis filaments were observed in surface sediments. OM degradation rates varied between 5.3 and 47.1 mmol m -2 day -1 (64-565 mg m -2 day -1 ), were highest in the muddy sediments and sulphate reduction rates accounted for 20-40% of the OM degraded. Diatoms, being heavy sink rapidly, and are an important vector to transport catchment N and P to sites of denitrification and P-trapping in the sediments. Denitrification rates (mean *4 mmol N m -2 day -1 ), up to 7 mmol N m -2 day -1 (105 mg N m -2 day -1 ) were measured, and denitrification efficiencies were highest (mean = 86 ± 4%) in the sandy sediments (*20% of the area of BB), but lower in the muddy sediments (mean = 63 ± 15%). These differences probably result from higher OM loads and anaerobic respiration in muddy sediments. Most DIP ([70%) from OM degradation was not released into overlying waters but remained trapped in surface sediments. Biophysical (advective) processes were responsible for the measured metabolite (O 2 , CO 2 , DSi, DIN and DIP) fluxes across the sediment-water interface.

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“…Blindow (1992) observes that angiosperms may outcompete charophytes in shallow turbid water. Atkinson et al (1981) suggests Myall Lake is particularly susceptible to pollution and eutrophication associated with increased development. Increased loads of nutrients and sediments have the potential to increase turbidity to the detriment of the submerged macrophytes that presently dominate Myall Lake.…”

Section: Introductionmentioning

confidence: 97%

Mechanisms affecting biomass and distribution of charophytes and Najas marina in Myall Lake, New South Wales, Australia

Sanderson¹,

Asaeda

Rajapakse

et al. 2008

Hydrobiologia

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Two years of measurements are explored with a view to formulating an ecosystem model for Myall Lake. Stable physical characteristics, low catchment loads, low light attenuation, flat-bottomed hypsometry, and soft gyttja substrate allow stable charophyte biomass throughout the year in Myall Lake. Chara fibrosa dominates the total biomass and is abundant over the depth range 0.5-4 m. Nitella hyalina is found over the same depth range but has diminished biomass at depths greater than 2 m due to increased incidence of zero-biomass samples at depths greater than 1.5 m. Upper bounds for biomass densities were estimated for charophytes. Najas marina has great seasonal variability and meadows can have very high biomass in waters 1.5-2.7 m deep. High biomass of Najas marina is associated with low biomass of Nitella hyalina and may be a factor determining how the biomass of Nitella hyalina is distributed with respect to depth. Patchiness of Najas marina is particularly high. Temperature and light can support two growing seasons for Najas marina but mechanical disturbance is often high in spring and high biomass was only observed in late autumn during the present study. Less than 5% of the present-day production of submerged macrophytes would have been required to produce organic material of the gyttja over a 1,000-year period. The spatial distributions of gyttja and the dominant macrophytes are consistent with wind patterns. Downlake limits on the distributions of charophytes and Najas marina are related to a gradient in the coefficient of light attenuation that is, in turn, related to proximity to the bulk of the catchment load.

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An ecological investigation of the Myall Lakes region

Cited by 19 publications

References 18 publications

The physicochemistry of some dune ponds on the Outer Banks, North Carolina

The physicochemistry of some dune ponds on the Outer Banks, North Carolina

Biogeochemical processes at the sediment–water interface, Bombah Broadwater, Myall Lakes

Mechanisms affecting biomass and distribution of charophytes and Najas marina in Myall Lake, New South Wales, Australia

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