Limnological characteristics of two coastal Dune Lakes, Jervis Bay, South Eastern Australia

1993 ◽  
Vol 44 (3) ◽  
pp. 437 ◽  
Author(s):  
RH Norris ◽  
JL Moore ◽  
WA Maher ◽  
LP Wensing
Keyword(s):  
Oxygen Depletion ◽  
Coastal Dune ◽  
Organic Load ◽  
Physical Factors ◽  
Biological Interactions ◽  
Marine Aerosols ◽  
Low Salinity ◽  
Eastern Australia ◽  
Dune Lakes ◽  
Wind Mixing

Limnological features of two permanent, closed, coastal dune lakes that are separated by only about 400 m are reported. The depth of Lake Windermere fluctuated by about 7 m during this study (1982- 1988); however, fluctuations up to 15 m were observed between 1970 and 1988. Lake Windermere is exposed to wind mixing, is transparent and is usually mixed, or only weakly stratified. Lake McKenzie is semi-perched, darkly coloured and strongly stratified with an anoxic hypolimnion during summer. It is about one fifth of the surface area and half the depth of Lake Windermere and protected from wind mixing. Both lakes are acidic and have low salinity, and the dominant ions are sodium and chloride probably from precipitation of marine aerosols. Oxygen depletion in the hypolimnion of both lakes indicates a substantial organic load, the source of which is allochthonous material from the catchment rather than autochthonous material. Lake Windermere had higher densities of zooplankton (mostly Calamoecia tasmanica) than Lake McKenzie, but the latter lake had higher numbers of the predaceous Chaoborus sp. Lake McKenzie had higher invertebrate densities than Lake Windermere and these fluctuated widely between years, corresponding with variation in rainfall. Mayflies and chironomids were numerically dominant in Lake McKenzie, and caddisflies and chironomids were numerically dominant in Lake Windermere. Turtle and odonate predators were more common in Lake McKenzie than in Lake Windermere. It is postulated that biological interactions are more important in shaping the communities in Lake McKenzie and physical factors such as wave action are more important in Lake Windermere.

Reconnaissance limnology of some coastal dune lakes of Cape York Peninsula, Queensland

1986 ◽  
Vol 37 (2) ◽  
pp. 167 ◽  
Author(s):  
BV Timms
Keyword(s):  
Coastal Dune ◽  
Tropical Species ◽  
Eastern Australia ◽  
Dune Lakes ◽  
Littoral Invertebrates ◽  
Cape York ◽  
Almost All

All nine lakes studied are small (mean area 32 ha), shallow (< 5 m deep), watertable exposures in thin dunes overlying laterite or sandstone. Their water is fresh (mean salinity 52 mg I-1), acid (mean pH 4.8) and dominated by Na+ and Cl-, but with appreciable amounts of Ca2+, Mg2+ and HCO3-. Almost all macrophytes, littoral invertebrates, fish and limnetic zooplankters are common tropical species. A few species are shared with dune lakes in southern Australia and even fewer are endemic. Hence, these tropical dune lakes are different from those in temperate and subtropical eastern Australia.

Hierarchical interpretation of nonlinear relationships linking yellowfin tuna (Thunnus albacares) distribution to the environment in the Atlantic Ocean

2001 ◽  
Vol 58 (3) ◽  
pp. 458-469 ◽  
Author(s):  
Olivier Maury ◽  
Didier Gascuel ◽  
Francis Marsac ◽  
Alain Fonteneau ◽  
Anne-Laure De Rosa
Keyword(s):  
Adult Population ◽  
Yellowfin Tuna ◽  
Additive Models ◽  
Small Scale ◽  
Physical Factors ◽  
Thunnus Albacares ◽  
Catch Per Unit Effort ◽  
Low Salinity ◽  
Nonlinear Relationships ◽  
Unit Effort

Using generalized additive models, we show evidence for nonlinear relationships between various hydrological factors and age-structured catch per unit effort of Atlantic yellowfin tuna (Thunnus albacares) for two fishing fleets. Catchability effects are distinguished from tuna environmental preference effects in the catch per unit effort variability. With respect to catchability, an important nonlinear effect of local fishing effort is highlighted for each fleet. It is interpreted as resulting from a local overfishing phenomenon of adult yellowfin tuna and from vessel fishing tactics (cooperation/spying). The environmental preferences obtained facilitate the interpretation of the hierarchical spatial distribution and age-dependent movements of the yellowfin population. We show that, on a large spatiotemporal scale (the whole ocean), low salinity is a good predictor of yellowfin habitat. Juveniles are mainly distributed in low-salinity waters (<0.035 kg·kg–1) when adults extend their range to waters of 0.036 kg·kg–1. On a mesoscale, adult population annual reproductive transatlantic displacements are probably driven by temperature and salinity gradients to warm and low-salinity locations that are favorable for juveniles. North–south seasonal movements of the population are clearly related to warmwater seasonal oscillations. On a small scale, ocean thermic stability and gradients of sea surface temperature are important physical factors determining yellowfin concentration.

scholarly journals Editorial

1986 ◽  
Vol 3 ◽  
pp. 2-3
Author(s):  
Jay Hall
Keyword(s):  
Cultural Change ◽  
Late Holocene ◽  
The State ◽  
Coastal Dune ◽  
Human Occupation ◽  
Moreton Bay ◽  
Eastern Australia ◽  
Fundamental Research ◽  
Soil Units ◽  
Significant Discovery

1986 has been a very good year for archaeology in Queensland. As the following pages testify, fundamental research is being undertaken throughout the length and breadth of the state. Furthermore it is being carried out by researchers who hail from not only Queensland but institutions throughout Australia. Perhaps the most significant discovery reported this year was the site of Wallen Wallen Creek on North Stradbroke Island, Moreton Bay (see R. Neal and E. Stock, Nature 1986:618-621). While excavating a recent surface midden for salvage purposes, Rob Neal, a Ph.D candidate at Queensland University, discovered a deep (2.5m) deposit within a coastal dune which yielded a continuous human occupation sequence. Collaboration with geomorphologist Errol Stock from Griffith University established that two soil units were formed after the dune was laid down and that associated cultural material is relatively undisturbed. C14 dating revealed an internally consistent series of determinations which stretch to over 22,000 B.P. Present results indicate a dramatic increase in occupation intensity (as measured by discard rate) in the late Holocene (esp. after ca. 2,000 B.P.), a pattern which fits well with results from other research in this area (eg. Hall Robins QAR, Volume 1) as well as other parts of eastern Australia. This discovery has provided the Pleistocene-Holocene chronological framework that has been sought for the Moreton Region for several years now. Future analysis of Wallen Wallen Creek material promises to add much to our notions of cultural change in this and adjacent areas.

Optical properties, Nutrients and Phytoplankton of freshwater Coastal Dune Lakes in South-east Queensland

1988 ◽  
Vol 39 (6) ◽  
pp. 805 ◽  
Author(s):  
LC Bowling
Keyword(s):  
Optical Properties ◽  
Chlorophyll A ◽  
Coastal Dune ◽  
Photosynthetically Available Radiation ◽  
Attenuation Coefficients ◽  
Low Concentrations ◽  
Dune Lakes ◽  
Lake Waters

Gilvin was the main attenuator of photosynthetically available radiation (PAR) in 26 freshwater coastal dune lakes, despite most being only slightly humic (range 0.000-27.866 m-1, median = 1.088 m-1). Most were also non-turbid [range 0.27-3.00 nephelometric turbidity units (NTU), median = 0.77 NTU] and had low concentrations of chlorophyll a (range 0.212-15.869 �g I-1, median = 3.285 �g I-1). Accordingly there was only slight to moderate attenuation of PAR in most lakes, the majority having mean downwelling vertical attenuation coefficients of less than 1.0 m-1. However, Secchi depths indicate that the lake waters were more transparent during this study than previously reported in the literature. The lakes were typically oligotrophic, acidic, and of low conductivity. Desmids and Peridinium spp. dominated the phytoplankton, although Dynobryon cylindricum Imhof. and various Chlorococcales were also common.

scholarly journals The Relation of the Plankton to some Chemical and Physical Factors in the Clyde Sea Area

1927 ◽  
Vol 14 (4) ◽  
pp. 837-868 ◽  
Author(s):  
S. M. Marshall ◽  
A. P. Orr
Keyword(s):  
Ph Value ◽  
Close Relation ◽  
Physical Factors ◽  
Low Salinity ◽  
Open Sea ◽  
Clyde Sea ◽  
Sea Area ◽  
Physical And Chemical ◽  
Apparent Influence

1. Simultaneous observations are recorded of some biological, physical, and chemical changes in the Clyde Sea Area in 1924, 1925, and 1926.2. A close relation between diatom increases and changes in pH value, dissolved oxygen saturation and dissolved phosphate has been found.3. It appears that the more numerous diatom increases in Loch Strivan as compared with the open sea are due to the more frequent mixing.4. Confirmation of the fact that diatom increases begin at the surface and gradually spread into deeper water has been obtained.5. The occurrence of Peridinians is apparently related to high temperature and low salinity.6. The amount of sunshine in the early part of the year does not exert any apparent influence on the date of the spring diatom increase in the Clyde Sea Area.7. The regeneration of phosphate in the deep water of Loch Strivan has been described.

scholarly journals The effect of various abiotic factors on the survival growth of Escherichia coli and Pseudomonas aeruginosa in bathroom greywater

2012 ◽  
Vol 2 (2) ◽  
pp. 92-101 ◽  
Author(s):  
R. Khalaphallah ◽  
Y. Andres
Keyword(s):  
Escherichia Coli ◽  
Pseudomonas Aeruginosa ◽  
Zeta Potential ◽  
Decay Constant ◽  
Abiotic Factors ◽  
Physical Factors ◽  
E Coli ◽  
Low Salinity ◽  
Test Conditions ◽  
Aerobic And Anaerobic

This study was conducted to examine the effect of various abiotic (non-living chemical and physical) factors, which enhance or limit the growth of Escherichia coli and Pseudomonas aeruginosa in bathroom greywater (GW). These factors included: temperature (6 ± 2, 23 ± 2 and 42 ± 2 °C); aeration (aerobic and anaerobic); salinity (1.75 and 3.5%); GW with deionised water (DW) (50% GW:50% DW); and nutrient-rich and -poor medium. The survival period and decay constant (K) were less at 42 ± 2 °C than at 23 ± 2 °C and 6 ± 2 °C. The optimum survival of E. coli and P. aeruginosa was measured under aerobic and anaerobic condition, respectively. P. aeruginosa showed better survival in low salinity concentrations than E. coli. Cell size and zeta potential were also measured for both species under the test conditions.

Effects of environmental conditions on the production of hypocotyl hairs in seedlings of Melaleuca ericifolia (swamp paperbark)

2008 ◽  
Vol 56 (7) ◽  
pp. 564 ◽  
Author(s):  
Randall W. Robinson ◽  
Paul I. Boon ◽  
Nina Sawtell ◽  
Elizabeth A. James ◽  
Robert Cross
Keyword(s):  
Environmental Conditions ◽  
Water Availability ◽  
Coastal Wetlands ◽  
Root Hairs ◽  
Harsh Environments ◽  
Low Salinity ◽  
South Eastern ◽  
Eastern Australia ◽  
Small Wetland ◽  
South Eastern Australia

The production of hypocotyl hairs in the early stages of seedling development can strongly influence the success with which plants recruit sexually in harsh environments. Although wetlands are one type of environment in which seedlings might be expected to develop hypocotyl hairs, there have been few studies of these structures in the woody aquatic plants. We investigated the production of hypocotyl hairs in Melaleuca ericifolia Sm., a small wetland tree widely distributed across swampy coastal areas of south-eastern Australia, in relation to water availability, salinity, temperature and light regime. Hypocotyl hairs were ~20 mm long × 30 μm wide; in contrast, root hairs were generally less than 5 mm long and 15 μm wide. Hypocotyl hairs were produced only under a narrow range of environmental conditions—low salinity, low water availability, moderate temperature, and darkness—and seedlings that failed to produce hypocotyl hairs did not survive. Since the conditions under which hypocotyl hairs were produced were at least as, and possibly even more, restricted than those required for successful germination of seeds, it is likely that the successful sexual recruitment of M. ericifolia would be rare and episodic under conditions existing in most coastal wetlands in south-eastern Australia.

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