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Northern New South Wales (northern + new_south_wales)
Selected AbstractsRural Youth Migration Trends in Australia: an Overview of Recent Trends and Two Inland Case StudiesGEOGRAPHICAL RESEARCH, Issue 2 2008NEIL ARGENT Abstract Much of what has been written on the topic of Australian rural youth migration trends and processes has often proceeded from data-free, or data-poor grounds. In this context, this paper analyses recent trends in youth (15 to 24 years of age) migration for a temporally-consistent set of Statistical Divisions (SDs) in inland rural Australia, and for local government areas within the Northern Tablelands and Slopes and Ranges of northern New South Wales and the Western Australian Central Wheatbelt. The paper finds that rates of youth loss from rural regions have increased over the past twenty years. Yet the patterns, processes, causes and impacts of rural youth migration are distributed in a spatially-uneven fashion. Some remote areas are receiving net migration gains while booming ,sea change' coastal regions have experienced heavy losses. While the ,flight to the bright city lights' syndrome is evident, relatively high proportions of young people in the Northern SD of NSW move within their immediate region. Nevertheless, some common understandings concerning youth mobility were also confirmed. Gender differentials in migration propensity between women and men are evident even at quite local scales. Young people are also more likely to search out capital cities than the rest of the population. Most inland areas still continue to experience heavy losses of local youth. A more precise understanding of rural youth migration trends is an important stepping stone in the establishment of a reinvigorated research effort into young rural people's perspectives of their changing life chances in their home communities. [source] A geomorphological framework for river characterization and habitat assessmentAQUATIC CONSERVATION: MARINE AND FRESHWATER ECOSYSTEMS, Issue 5 2001J.R. Thomson Abstract 1.,Methods to assess the physical habitat available to aquatic organisms provide important tools for many aspects of river management, including river health monitoring, determination of river restoration/rehabilitation strategies, setting and evaluating environmental flows and as surrogates for biodiversity assessment. 2.,Procedures used to assess physical habitat need to be ecologically and geomorphologically meaningful, as well as practicable. A conceptual methodological procedure is presented that evaluates and links instream habitat and geomorphology. 3.,The heterogeneity of habitat potential is determined within geomorphic units (such as pools, runs, riffles) by assessing flow hydraulics and substrate character. These two variables are integrated as hydraulic units , patches of uniform flow and substrate. 4.,This methodology forms a logical extension of the River Styles framework that characterizes river form and behaviour at four inter-related scales: catchments, landscape units, River Styles (reaches) and geomorphic units. As geomorphic units constitute the basis to assess aquatic habitat availability, and they form the building blocks of river and floodplain systems, intact reaches of a particular River Style should have similar assemblages of instream and floodplain habitat. 5.,An application of the hydraulic unit procedure is demonstrated in gorge, partly-confined and alluvial River Styles from the Manning catchment in northern New South Wales, Australia. Copyright © 2001 John Wiley & Sons, Ltd. [source] Variability in Transport Properties for Blackbutt Timber in New South Wales: Within and Between-Tree VariabilityASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING, Issue 1-2 2006S. J. Cabardo Variability is a key issue in the processing of biological materials, in this case the hying of hardwood timber. This paper reports the measurements of variability of transport properties. which are relevant to the drying of blackbutt, Eucalyptus pilularis Sm, from northern New South Wales. Specifically, within-tree and between-tree variations are reported for two blackbutt regrowth logs. An analysis of variance showed that some timber properties were affected by the board positions within-trees and between-trees. Circumferential and radial efects were significant for the within- tree variability of most transport properties. Similarly, radial and circumferential effects were signlficant for most of the transport parameters between trees, but can be tentatively stated because only two regrowth logs were assessed. Timber boards with high initial moisture contents had higher rates of diffirsion and low basic densities using principal components analysis. A possible reason is that if there is less wood material per unit volume, these vacant spaces may be occupied by water, and there is also less resistance for diffusive transport of moisture. [source] Flowering phenology of myrtaceous trees and their relation to climatic, environmental and disturbance variables in northern New South WalesAUSTRAL ECOLOGY, Issue 2 2000B. Law Abstract Patterns of flowering phenology, which represent a partial description of food availability for nectarivores, are described for 20 species of myrtaceous trees on the mid-north coast of New South Wales (NSW), Australia. Data were recorded monthly between 1982 and 1992 across 23 sites that comprise a variety of local environmental conditions and disturbance histories. Flowering periodicity and intensity were highly variable between species and sites, ranging from annual flowering to no flowering over the 10-year period. Cool temperatures prior to floral budding was a strong predictor of flowering for nine species. Extraordinary climatic events also influenced flowering. The period of greatest flowering for all species combined occurred 9 months after the highest monthly rainfall recorded in the survey (March 1985). An 18-month extreme drought led to poor flowering in Corymbia variegata, Eucalyptus acmenoides, Eucalyptus grandis and Eucalyptus resinifera, but recovery after the drought broke was rapid. In contrast to climate, few site-based environmental variables explained the intersite variation in flowering performance of the tree species. Site disturbance from logging at two sites during the survey did not influence flowering in the remaining canopy over following years. No species showed a negative correlation with a history of recent logging, and direct comparisons, between large- and medium-sized trees, of the percentage of foliage in flower showed no differences for any species. At the scale of a timber production forest, the negligible effect of tree size (if >10 cm diameter at breast height over bark), and high stem density resulting from selective logging, leave about half of the net harvestable area producing flowers at a similar density to unlogged forest. However, larger trees flowered more frequently than medium-sized trees in C. variegata (medium: every 5.9 years; large: every 2.3 years) and there was a trend in this direction for 13 of 17 species. Low-intensity burns and wildfires caused differing amounts of crown scorch, sometimes resulting in bud loss, but most species flowered at prefire levels 1,3 years after the disturbance. Eucalyptus microcorys and Angophora costata flowered poorly at sites that experienced frequent low-intensity burns. Regionally, blossom shortages occur through a combination of spatial and temporal patchiness in flowering and the clearing of those species that occurred on soils preferred for agriculture. On the north coast of NSW, these shortages commonly occur from late winter to spring. Species that flower reliably in this period include Eucalyptus robusta, Eucalyptus tereticornis and Eucalyptus siderophloia in late winter and E. siderophloia and E. acmenoides in spring. [source] Broadleaf privet, Ligustrum lucidum Aiton (Oleaceae), a late-season host for Nezara viridula (L.), Plautia affinis Dallas and Glaucias amyoti (Dallas) (Hemiptera: Pentatomidae) in northern New South Wales, AustraliaAUSTRALIAN JOURNAL OF ENTOMOLOGY, Issue 4 2004Marc Coombs Abstract Seasonal abundances of the pentatomids Nezara viridula, Plautia affinis and Glaucias amyoti were monitored on the introduced weed, broadleaf privet, Ligustrum lucidum from January 1998 to July 2000 at Moree, New South Wales, Australia. All developmental stages (eggs, nymphal instars and adults) of N. viridula, P. affinis and G. amyoti were recovered from privet. For all species, adult and nymphal densities peaked from February to May, coincident with privet fruiting. Nymphs of each species successfully developed when fed L. lucidum berries in the laboratory. The importance of L. lucidum as a host is discussed in relation to its role in maintaining populations of pentatomid pest species and in particular as a late-season host prior to overwintering. [source] Seasonal phenology of the gall-making fly Fergusonina sp. (Diptera: Fergusoninidae) and its implications for biological control of Melaleuca quinquenerviaAUSTRALIAN JOURNAL OF ENTOMOLOGY, Issue 4 2000John A Goolsby Abstract A gall-making fly, Fergusonina sp., is under study as a potential biological control agent of Melaleuca quinquenervia (Cav.) S. T. Blake, an invasive weed in Florida, USA. The seasonal phenology of Fergusonina sp. and its host M. quinquenervia was studied over 2 years in northern New South Wales and south-eastern Queensland. Fergusonina sp. populations followed an annual cycle, with gall numbers peaking in August/September. Gall density was strongly correlated with leaf bud density and temperature, but not rainfall. Comparison of climates in Australia across the native range of Fergusonina sp. with the climate of Miami, Florida, predicts that climate should not be a limiting factor in its establishment. The fly/nematode complex of Fergusonina/Fergusobia sp. is compared with other gall-making agents used in biological control programs. Galls are formed from primordial leaf bud and reproductive structures of the plant and have many of the attributes of a moderately powerful metabolic sink. High gall densities could potentially suppress seed production and reduce the vigour of the tree, which would make this insect species an effective biological control agent of M. quinquenervia. [source] | ||||||||||