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Готові списки джерел за темами / Stream ecology Victoria Acheron River

Добірка наукової літератури з теми "Stream ecology Victoria Acheron River"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 29 січня 2023

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Статті в журналах з теми "Stream ecology Victoria Acheron River"

1

DOEG, T. J., P. S. LAKE, and R. MARCHANT. "Colonization of experimentally disturbed patches by stream macroinvertebrates in the Acheron River, Victoria." Austral Ecology 14, no. 2 (June 1989): 207–20. http://dx.doi.org/10.1111/j.1442-9993.1989.tb01428.x.

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2

O'Leary, P., PS Lake, R. Marchant, and TJ Doeg. "Macroinvertebrate activity in the water column of backwaters in an upland stream in Victoria." Marine and Freshwater Research 43, no. 6 (1992): 1403. http://dx.doi.org/10.1071/mf9921403.

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The activity of benthic invertebrates was monitored in the water column of slowly flowing backwaters of the Acheron River during summer. Samples were taken throughout 24 h on two occasions, and densities of fauna were compared with densities in drift samples taken concurrently in the main channel. Drift densities were generally higher than those in backwaters, but not by orders of magnitude. Also, drift densities displayed significant die1 variation, whereas densities in backwaters did not consistently show such a pattern. Species composition generally differed between the two habitats. This brief study demonstrates that benthic invertebrates do swim in the water column of stream backwaters and that they may use this opportunity for colonization.

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3

LAKE, P. S., T. J. DOEG, and R. MARCHANT. "Effects of multiple disturbance on macroinvertebrate communities in the Acheron River, Victoria." Austral Ecology 14, no. 4 (December 1989): 507–14. http://dx.doi.org/10.1111/j.1442-9993.1989.tb01458.x.

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4

St.Clair, RM. "Life histories of six species of Leptoceridae (Insecta: Trichoptera) in Victoria." Marine and Freshwater Research 44, no. 2 (1993): 363. http://dx.doi.org/10.1071/mf9930363.

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Life history studies were carried out for populations of six species of Leptoceridae. Study sites were a permanent river (Acheron), a temporary river (Lerderderg) and a permanent lake (Monash University). Life histories varied in degree of synchrony of larval development, in length of adult emergence period, and from bi- to semivoltine. Oviposition requirements of adults were found to be the major factor influencing synchrony of the life history of one species. Life history features did not ameliorate the effects of the severe drought of 1982-83, nor did drought result in large changes in life histories.

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5

Marchant, R., and G. Hehir. "A method for quantifying hand-net samples of stream invertebrates." Marine and Freshwater Research 50, no. 2 (1999): 179. http://dx.doi.org/10.1071/mf98113.

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Quantitative sampling using a hand-net can be accomplished by taking three successive catches of invertebrates from the same point on the streambed. This is a form of removal sampling. By plotting the decline in number of individuals in each catch against the total previously caught, the total population at the sampling point can be estimated. From this, the probability of capture in a single catch (p) can be calculated. For Agapetus, other trichopteran, leptophlebiid, caenid and gripopterygid larvae from a site on a tributary of the Acheron River in southern Australia, p varied from 0.66 to 0.81. Additional data for a species of Gammarus from the Credit River in Ontario gave a p value of 0.67. In three successive catches the overall probability of capture exceeded 95% for all taxa, indicating that with this degree of effort most individuals present were caught.

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6

Downes, Barbara J., Alecia Bellgrove, and Jodie L. Street. "Drifting or walking? Colonisation routes used by different instars and species of lotic, macroinvertebrate filter feeders." Marine and Freshwater Research 56, no. 6 (2005): 815. http://dx.doi.org/10.1071/mf04281.

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Many views of stream invertebrate populations centre on drift as the major route of larval dispersal, but few studies have presented unambiguous information about the role of drift. We present the results from an experiment designed to determine whether the major route of colonisation of substrata by hydropsychid larvae (commonly found in the drift) is by drifting directly onto substrata or by walking along the stream bottom. The experimental design contained four treatments: substrata open to drifters and walkers; fenced substrata open to drifters only; and two treatments open to drifters and walkers that provided forms of fence controls. Fifteen replicates of each treatment were set out at random locations within a riffle at each of three sites, with each site on a different river (the Little River, the Steavenson River and the Acheron River) in the Acheron River catchment. The experiment was run twice, once during autumn (April 1999) and once during early summer (January 2000). Both experiments were colonised by three species of hydropsychids, Asmicridea sp. AV1, and Smicrophylax sp. AV1 and AV2. We found that 2nd/3rd instars of Asmicridea sp. AV1 walked as well as drifted, whereas all others primarily drifted. No relation between numbers of recruits and water speed was found when substrata were open only to drifters, whereas substrata open also to walkers gained more recruits in faster flows. Additionally, larvae more frequently abandoned nets in slow than fast flows, indicating that drifting into unfavourable flow environments may result in mortality or redispersal of larvae. These findings demonstrate that, although drift is important, it is not necessarily the only method used by hydropsychids to colonise substrata. Larvae may have more capacity to choose substrata in fast flows when they colonise substrata by walking. Spot measures of hydropsychid distribution cannot distinguish between these explanations. The finding that walkers can sometimes comprise significant numbers of recruits raises the prospect that hydropsychids can be sourced locally and have not inevitably drifted in from upstream locations.

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7

Rehman, Saqib, Kamran Khan, and Absar Ahmed. "Association between the Dynamics of Indian Ocean Subtropical High and Winter Time Precipitation and Stream Flow: A Case Study Over Acheron River Catchment, Victoria." British Journal of Applied Science & Technology 12, no. 3 (January 10, 2016): 1–9. http://dx.doi.org/10.9734/bjast/2016/20100.

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8

Atazadeh, Ehsan, Andrew Barton, and Jafar Razeghi. "Importance of environmental flows in the Wimmera catchment, Southeast Australia." Limnological Review 20, no. 4 (December 1, 2020): 185–98. http://dx.doi.org/10.2478/limre-2020-0018.

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Abstract In this paper the environment, climate, vegetation, indigenous and European settlement history, stream flow patterns, water quality and water resources development in western Victoria, Australia are studied. The last part of the paper focuses on the MacKenzie River, a tributary of the Wimmera River located on the northern slopes of the Grampians Ranges in western Victoria, Australia. Water release along the MacKenzie River was regulated to improve water quality, stream condition and river health especially in the downstream reaches. The upstream section tends to receive water most days of the year due to releases to secure the requirements of water supply for the city of Horsham and its recreational and conservation values, which is diverted into Mt Zero Channel. Below this the middle and downstream sections receive a more intermittent supply. Annually, a total of 10,000 dam3 of water is released from Wartook Reservoir into the MacKenzie River. Of this volume, only about 4,000 dam3 was released explicitly for environmental purposes. The remaining 6,000 dam3 was released to meet consumptive demands and to transfer water to downstream reservoirs. The empirical data and models showed the lower reaches of the river to be in poor condition under low flows, but this condition improved under flows of 35 dam3 per day, as indicated. The results are presented to tailor discharge and duration of the river flows by amalgamation of consumptive and environmental flows to improve the condition of the stream, thereby supplementing the flows dedicated to environmental outcomes. Ultimately the findings can be used by management to configure consumptive flows that would enhance the ecological condition of the MacKenzie River.

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9

Chessman, BC. "Impact of the 1983 wildfires on river water quality in East Gippsland, Victoria." Marine and Freshwater Research 37, no. 3 (1986): 399. http://dx.doi.org/10.1071/mf9860399.

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Eleven stream stations within the basins of the Bemm, Cann, Thurra, Wingan and Genoa Rivers were sampled during a 3-month interval following a prolonged drought and intense and extensive forest fires. Emphasis was placed on flows resulting from three major storms that occurred during this period. Water-quality impacts of the fires were intermingled with those of the preceding drought, and flow- related comparisons with pre-drought data showed appreciable increases in colour, turbidity, suspended solids, potassium and nitrogen levels in the Bemm River, which was only marginally affected by the fires. In the Cann and Genoa Rivers, with much larger proportions of catchment burnt, electrical conductivity and phosphorus concentrations also rose substantially. Marked depletion of dissolved oxygen (to <6 mg I-1) was unique to streams with burnt catchments, but resulted from stagnant conditions at the end of the drought as well as from changes occurring at the time of the first post-fire storm. The fires had little obvious effect on temperature and pH regimes. Peak turbidities and concentrations of suspended solids and phosphorus were much greater in the Cann and Genoa river systems than elsewhere. Maximum values for these indicators were 130 NTU, 2300 mg I-1 and over 0.8 mg I-1, respectively. In the Thurra and Wingan basins, which were also burnt, stream suspended-solids levels were lower (<200 mg I-1), but solutes sometimes reached very high maxima (indicated by peak electrical conductivities of up to 110 mS m-1). Variations in catchment topography and soils and the relative importance of surface and subsurface flow probably account for these differences. The first post-fire storm produced the highest measured levels of many indicators in most streams, although the greatest flows were associated with the third storm. Nitrite and ammonia were notable exceptions to this generalization. Estimates of catchment exports indicated high sediment yields and moderate to high phosphorus yields from the Cann and Genoa catchments, by comparison with other Australian data.

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10

Doeg, TJ, and GA Milledge. "Effect of experimentally increasing concentration of suspended sediment on macroinvertebrate drift." Marine and Freshwater Research 42, no. 5 (1991): 519. http://dx.doi.org/10.1071/mf9910519.

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The effect of artificially elevating concentrations of suspended sediment on macroinvertebrate drift was studied in the Acheron River, 100 km north-east of Melbourne. Two experimental channels were established in the stream, and suspended sediment was introduced into one channel over a period of 1.5 h. The second channel was left undisturbed as a control. The concentration of suspended sediment was altered every 15 min, rising and falling to imitate concentrations reported during natural flood events. Drift was collected from two nets at the downstream end of each channel during each 15-min period. Collections were made for three 15-min periods before the introduction of the sediment and for three periods after the release. The addition of suspended sediment at a mean concentration of 133.4 mg L-1 over a 15-min period (compared with around 20 mg L-1 in the control channel) resulted in a sevenfold increase in the total number of drifting invertebrates. At lower concentrations (both before and after this peak concentration), drift densities were more similar to prerelease conditions. The number of drifting taxa also showed an increase during the period of high release. Although the experiment did not conform strictly to a full experimental design, the results indicated that there may be a threshold level of suspended sediment that initiates macroinvertebrate drift, and this experiment represents an appropriate starting point for future investigations.

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Дисертації з теми "Stream ecology Victoria Acheron River"

1

Treadwell, Simon Andrew 1968. "Patterns in community metabolism and biomass of biofilms colonising large woody debris along an Australian lowland river." Monash University, Dept. of Biological Sciences, 2002. http://arrow.monash.edu.au/hdl/1959.1/5605.

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2

Lloyd, Natalie J. "Spatial autocorrelation of benthic invertebrate assemblages in two Victorian upland streams." Monash University, Dept. of Biological Sciences, 2002. http://arrow.monash.edu.au/hdl/1959.1/8428.

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