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Notopala sublineata, Notopala hanleyi(Viviparidae) andThiara balonnensis (Thiaridae) are prosobranchgastropodsthat were once abundant in the lower River Murray. These andothersnail taxa have declined markedly over the last 50 years,coinciding with increased flow regulation by dams and weirs.Inthis paper we speculate that the decline may be linked(More)
Stable water levels and turbidity associated with flow regulation in the River Murray have promoted the growth of filamentous green algae and Cyanobacteria in biofilms on submerged wood. We investigated the assimilation of biofilm algae by two dominant consumers, the decapod crustaceans Macrobrachium australiense (Palaemonidae) and Paratya australiensis(More)
The present study validates age estimates from a suite of calcified structures (scales, opercular bones and otoliths), assesses the consistency of age interpretations and evaluates growth models in common carp from the lower Murray River, Australia. Marginal increment analysis was used to validate annulus counts, with attention to the 'edge interpretation(More)
The conservation biology of Australasian freshwater mussels is hindered by lack of a taxonomic framework that employs molecular data as a complement to shell characters, larval forms and internal anatomy. The fauna includes more than 32 known species (30+ Hyriidae, 2 Unionidae), but has not been revised for 55 years, despite minor amendments. The hyriids(More)
The breakdown of litter from eight common plants was investigated in Sunnyside Swamp, a wetland connected to the River Murray. Breakdown rates were related to the content of structural carbohydrate tissue in each species. Burial in wetland sediments inhibited the breakdown of relatively fast-decomposing species (e.g. Myriophyllum caput-medusae), but did not(More)
PURPOSE The purpose of this study was to explore the details of the experiences and meanings that adolescents associate with spirituality. DESIGN AND METHODS This exploratory qualitative study used focus group discussions to uncover the experiences of 22 adolescents ages 16-19 years from two midwestern Canadian high schools. RESULTS Three themes(More)
Molecular genetic information should be a pre-requisite when evaluating conservation priorities in highly structured species such as freshwater fishes. Nuclear (allozyme) and mitochondrial (cytochrome b) markers were used to investigate phylogeographic structure in the Yarra pygmy perch Nannoperca obscura (Klunzinger), a threatened freshwater fish endemic(More)
The rotifer Brachionus plicatilis Muiller, shown in Fig. 13.1, is a cosmopolitan inhabitant of inland saline and coastal brackish waters. It tolerates a remarkable range of environmental conditions and, especially in alkaline (soda) lakes, may attain very high population densities. Like the familiar brineshrimp Artemia, and the green alga Dunaliella, B.(More)
Literature data on the relative growth of body parts, functional morphology, feeding behaviour and differential growth capacity in 0+ carp, Cyprinus carpio, were relatively consistent with respect to the onset of the juvenile period in this species, which occurs at 20-25 mm standard length (20-30 days after hatching), when the process of metamorphosis(More)