Norm Duke
University of Queensland
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Norm Duke.
Environmental Conservation | 2011
Kimberley Warren-Rhodes; Anne-Maree Schwarz; Linda Ng Boyle; Joelle Albert; Stephen Suti Agalo; Regon Warren; Andrew Bana; Chris Paul; Ringo Kodosiku; Wilko Bosma; Patrik Rönnbäck; Beatrice Crona; Norm Duke
Mangroves are an imperilled biome whose protection and restoration through payments for ecosystem services (PES) can contribute to improved livelihoods, climate mitigation and adaptation. Interviews with resource users in three Solomon Islands villages suggest a strong reliance upon mangrove goods for subsistence and cash, particularly for firewood, food and building materials. Village-derived economic data indicates a minimum annual subsistence value from mangroves of US
Mangroves and Salt Marshes | 1999
Kathy Burns; Susan Codi; R Swannell; Norm Duke
345–1501 per household. Fish and nursery habitat and storm protection were widely recognized and highly valued mangrove ecosystem services. All villagers agreed that mangroves were under threat, with firewood overharvesting considered the primary cause. Multivariate analyses revealed village affiliation and religious denomination as the most important factors determining the use and importance of mangrove goods. These factors, together with gender, affected users’ awareness of ecosystem services. The importance placed on mangrove services did not differ significantly by village, religious denomination, gender, age, income, education or occupation. Mangrove ecosystem surveys are useful as tools for raising community awareness and input prior to design of PES systems. Land tenure and marine property rights, and how this complexity may both complicate and facilitate potential carbon credit programmes in the Pacific, are discussed.
Global Ecology and Biogeography | 2011
Chandra Giri; E. Ochieng; Larry L. Tieszen; Zhiliang Zhu; Ashbindu Singh; Thomas R. Loveland; Jeffery G. Masek; Norm Duke
As part of a larger study on the bioremediation of oil spills in tropical mangrove habitats, we conducted a series of flask experiments to test for the presence of hydrocarbon degrading micro‐organisms in representative wetland habitats. Also tested was the biodegradation of selected oils (Gippsland Crude, Arabian Light Crude and Bunker C), that are transported along the Australian coast. We also tested for potential inhibition of biodegradation by natural organics in the mangrove pore waters and evaluated the ability of an oxygen release compound (ORC) to stimulate biodegradative processes. Evaporation was a significant factor in removing the light alkane and aromatic hydrocarbons from air and nitrogen sparged flasks. Evaporation removed ∼27% of the Gippsland, ∼37%of the Arabian, and ∼10% of the Bunker oils. Oxygen was necessary to support biodegradation as expected. The micro‐organisms were capable of biodegrading the non‐volatile saturate fraction of each oil. Degradation removed another 14 of the Gippsland, 30 of the Arabian, and 22 of the Bunker C oils. Normalisation of the individual aromatic hydrocarbon classes to internal triterpane biomarkers indicated some degradation of aromatics in the Arabian Light and Bunker C oils. Although alkane degradation rates were comparable in the three oils, the Gippsland oil had a higher wax content and after 14 days incubation, still contained as much as 25 of the alkanes present in the original oil. Thus, degradation of its aromatic fraction may have been delayed. Based on these results we estimate that Arabian Light Crude oil would have a shorter residence time than the other oils in mangrove sediment. It has a higher content of light hydrocarbons, which are readily removed by both physical and microbial processes. The Bunker C would be expected to have the longest residence time in mangrove sediment, because it contains a larger percentage of higher molecular weight, unresolved components. Comparison of the efficiency of inoculates from three tropical intertidal habitats (Avicennia and Rhizophora mangroves, plus salt marsh sediments) indicated the presence of hydrocarbon degrading micro‐organisms in all three habitats. There was no known history of oil contamination in the soil source area. There was no inhibition of degradation due to addition of mangrove pore waters. The ORC did not facilitate degradation in closed laboratory experiments. These results were used to formulate a bioremediation strategy to treat oiled sediments in mangrove forests in Queensland Australia, which was based on forced aeration and nutrient addition.Evaporation was a significant factor in removing the light alkane and aromatic hydrocarbons from air and nitrogen sparged flasks. Evaporation removed ∼27% of the Gippsland, ∼37% of the Arabian, and ∼10% of the Bunker oils. Oxygen was necessary to support biodegradation as expected. The micro-organisms were capable of biodegrading the non-volatile saturate fraction of each oil. Degradation removed another 14% of the Gippsland, 30% of the Arabian, and 22% of the Bunker C oils. Normalisation of the individual aromatic hydrocarbon classes to internal triterpane biomarkers indicated some degradation of aromatics in the Arabian Light and Bunker C oils. Although alkane degradation rates were comparable in the three oils, the Gippsland oil had a higher wax content and after 14 days incubation, still contained as much as 25% of the alkanes present in the original oil. Thus, degradation of its aromatic fraction may have been delayed. Based on these results we estimate that Arabian Light Crude oil would have a shorter residence time than the other oils in mangrove sediment. It has a higher content of light hydrocarbons, which are readily removed by both physical and microbial processes. The Bunker C would be expected to have the longest residence time in mangrove sediment, because it contains a larger percentage of higher molecular weight, unresolved components. Comparison of the efficiency of inoculates from three tropical intertidal habitats (Avicennia and Rhizophora mangroves, plus salt marsh sediments) indicated the presence of hydrocarbon degrading micro-organisms in all three habitats. There was no known history of oil contamination in the soil source area. There was no inhibition of degradation due to addition of mangrove pore waters. The ORC did not facilitate degradation in closed laboratory experiments.These results were used to formulate a bioremediation strategy to treat oiled sediments in mangrove forests in Queensland Australia, which was based on forced aeration and nutrient addition.
The APPEA Journal | 1998
Norm Duke; Kathy Burns; Otto Dalhaus
The APPEA Journal | 1998
Norm Duke; Jc Ellison; Kathy Burns
EPIC3Brisbane, The University of Queensland | 2012
Simon Albert; Alistair Grinham; John C. Bythell; Andrew D. Olds; Anne-Maree Schwarz; Kirsten Abernethy; Kiel Aranani; Myknee Sirikolo; Claudine Watoto; Norm Duke; J. McKenzie; Chris Roelfsema; Libby Liggins; Eran Brokovich; Olga Pantos; Janet Oeta; B. Gibbes
Archive | 2002
Norm Duke; Kathy Burns; R Swannell
Archive | 2007
Norm Duke; James Udy; Simon Albert; Mark Love; Annie Ross; Ian R. Tibbetts; Chris Roelfsema; David Neil; Guy Marion; Joelle Prange; Jennifer Corrin-Care; William Carter; P. J. Dart; Sean Hough
Archive | 2010
Simon Albert; Alistair Grinham; John C. Bythell; Andrew D. Olds; Anne-Maree Schwarz; Kirsten Abernethy; K. Aranani; Myknee Sirikolo; C. Watoto; Norm Duke; J. McKenzie; Chris Roelfsema; Libby Liggins; Eran Brokovich; Olga Pantos; Janet Oeta; B. Gibbes
Archive | 2007
Simon Albert; Mark Love; James Udy; Ian R. Tibbetts; Chris Roelfsema; David Neil; Guy Marion; Sean Hough; Anne Ross; Norm Duke