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  1. Article ; Online: Cloud Processing for Simultaneous Mapping of Seagrass Meadows in Optically Complex and Varied Water

    Eva M. Kovacs / Chris Roelfsema / James Udy / Simon Baltais / Mitchell Lyons / Stuart Phinn

    Remote Sensing, Vol 14, Iss 609, p

    2022  Volume 609

    Abstract: Improved development of remote sensing approaches to deliver timely and accurate measurements for environmental monitoring, particularly with respect to marine and estuarine environments is a priority. We describe a machine learning, cloud processing ... ...

    Abstract Improved development of remote sensing approaches to deliver timely and accurate measurements for environmental monitoring, particularly with respect to marine and estuarine environments is a priority. We describe a machine learning, cloud processing protocol for simultaneous mapping seagrass meadows in waters of variable quality across Moreton Bay, Australia. This method was adapted from a protocol developed for mapping coral reef areas. Georeferenced spot check field-survey data were obtained across Moreton Bay, covering areas of differing water quality, and categorized into either substrate or ≥25% seagrass cover. These point data with coincident Landsat 8 OLI satellite imagery (30 m resolution; pulled directly from Google Earth Engine’s public archive) and a bathymetric layer (30 m resolution) were incorporated to train a random forest classifier. The semiautomated machine learning algorithm was applied to map seagrass in shallow areas of variable water quality simultaneously, and a bay-wide map was created for Moreton Bay. The output benthic habitat map representing seagrass presence/absence was accurate (63%) as determined by validation with an independent data set.
    Keywords seagrass ; water quality ; cloud processing ; Moreton Bay ; machine learning ; field data ; Science ; Q
    Subject code 333
    Language English
    Publishing date 2022-01-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: The Risk of Multiple Anthropogenic and Climate Change Threats Must Be Considered for Continental Scale Conservation and Management of Seagrass Habitat

    Kathryn McMahon / Kieryn Kilminster / Robert Canto / Chris Roelfsema / Mitchell Lyons / Gary A. Kendrick / Michelle Waycott / James Udy

    Frontiers in Marine Science, Vol

    2022  Volume 9

    Abstract: Globally marine-terrestrial interfaces are highly impacted due to a range of human pressures. Seagrass habitats exist in the shallow marine waters of this interface, have significant values and are impacted by a range of pressures. Cumulative risk ... ...

    Abstract Globally marine-terrestrial interfaces are highly impacted due to a range of human pressures. Seagrass habitats exist in the shallow marine waters of this interface, have significant values and are impacted by a range of pressures. Cumulative risk analysis is widely used to identify risk from multiple threats and assist in prioritizing management actions. This study conducted a cumulative risk analysis of seagrass habitat associated with the Australian continent to support management actions. We developed a spatially explicit risk model based on a database of threats to coastal aquatic habitat in Australia, spanning 35,000 km of coastline. Risk hotspots were identified using the model and reducing the risk of nutrient and sediment pollution for seagrass habitat was assessed. Incorporating future threats greatly altered the spatial-distribution of risk. High risk from multiple current threats was identified throughout all bioregions, but high risk from climate change alone manifested in only two. Improving management of nutrient and sediment loads, a common approach to conserve seagrass habitat did reduce risk, but only in temperate regions, highlighting the danger of focusing management on a single strategy. Monitoring, management and conservation actions from a national and regional perspective can be guided by these outputs.
    Keywords coastal habitat ; seagrass ; risk assessment ; climate change ; management ; Science ; Q ; General. Including nature conservation ; geographical distribution ; QH1-199.5
    Subject code 333
    Language English
    Publishing date 2022-03-01T00:00:00Z
    Publisher Frontiers Media S.A.
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article: Methane and nitrous oxide emissions from a subtropical coastal embayment (Moreton Bay, Australia)

    Musenze, Ronald S / Alistair Grinham / James Udy / Ursula Werner / Zhiguo Yuan

    Journal of Environmental Sciences. 2015 Mar. 01, v. 29

    2015  

    Abstract: Surface water methane (CH4) and nitrous oxide (N2O) concentrations and fluxes were investigated in two subtropical coastal embayments (Bramble Bay and Deception Bay, which are part of the greater Moreton Bay, Australia). Measurements were done at 23 ... ...

    Abstract Surface water methane (CH4) and nitrous oxide (N2O) concentrations and fluxes were investigated in two subtropical coastal embayments (Bramble Bay and Deception Bay, which are part of the greater Moreton Bay, Australia). Measurements were done at 23 stations in seven campaigns covering different seasons during 2010–2012. Water–air fluxes were estimated using the Thin Boundary Layer approach with a combination of wind and currents-based models for the estimation of the gas transfer velocities. The two bays were strong sources of both CH4 and N2O with no significant differences in the degree of saturation of both gases between them during all measurement campaigns. Both CH4 and N2O concentrations had strong temporal but minimal spatial variability in both bays. During the seven seasons, CH4 varied between 500% and 4000% saturation while N2O varied between 128 and 255% in the two bays. Average seasonal CH4 fluxes for the two bays varied between 0.5±0.2 and 6.0±1.5mg CH4/(m2·day) while N2O varied between 0.4±0.1 and 1.6±0.6mg N2O/(m2·day). Weighted emissions (t CO2-e) were 63%–90% N2O dominated implying that a reduction in N2O inputs and/or nitrogen availability in the bays may significantly reduce the bays' greenhouse gas (GHG) budget. Emissions data for tropical and subtropical systems is still scarce. This work found subtropical bays to be significant aquatic sources of both CH4 and N2O and puts the estimated fluxes into the global context with measurements done from other climatic regions.
    Keywords emissions ; gases ; greenhouse gases ; methane ; methane production ; models ; nitrogen ; nitrous oxide ; surface water ; wind ; Australia
    Language English
    Dates of publication 2015-0301
    Size p. 82-96.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 1092300-7
    ISSN 1878-7320 ; 1001-0742
    ISSN (online) 1878-7320
    ISSN 1001-0742
    DOI 10.1016/j.jes.2014.06.049
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 7630: Show issues

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  4. Article: Methane and nitrous oxide emissions from a subtropical estuary (the Brisbane River estuary, Australia)

    Musenze, Ronald S / Ursula Werner / Alistair Grinham / James Udy / Zhiguo Yuan

    Science of the total environment. 2014 Feb. 15, v. 472

    2014  

    Abstract: Methane (CH4) and nitrous oxide (N2O) are two key greenhouse gases. Their global atmospheric budgeting is, however, flout with challenges partly due to lack of adequate field studies determining the source strengths. Knowledge and data limitations exist ... ...

    Abstract Methane (CH4) and nitrous oxide (N2O) are two key greenhouse gases. Their global atmospheric budgeting is, however, flout with challenges partly due to lack of adequate field studies determining the source strengths. Knowledge and data limitations exist for subtropical and tropical regions especially in the southern latitudes. Surface water methane and nitrous oxide concentrations were measured in a subtropical estuarine system in the southern latitudes in an extensive field study from 2010 to 2012 and water–air fluxes estimated using models considering the effects of both wind and flow induced turbulence. The estuary was found to be a strong net source of both CH4 and N2O all-year-round. Dissolved N2O concentrations ranged between 9.1±0.4 to 45.3±1.3nM or 135 to 435% of atmospheric saturation level, while CH4 concentrations varied between 31.1±3.7 to 578.4±58.8nM or 1210 to 26,430% of atmospheric saturation level. These results compare well with measurements from tropical estuarine systems. There was strong spatial variability with both CH4 and N2O concentrations increasing upstream the estuary. Strong temporal variability was also observed but there were no clear seasonal patterns. The degree of N2O saturation significantly increased with NOx concentrations (r2=0.55). The estimated water–air fluxes varied between 0.1 and 3.4mgN2Om−2d−1 and 0.3 to 27.9mgCH4m−2d−1. Total emissions (CO2-e) were N2O (64%) dominated, highlighting the need for reduced nitrogen inputs into the estuary. Choice of the model(s) for estimation of the gas transfer velocity had a big bearing on the estimated total emissions.
    Keywords emissions ; estuaries ; field experimentation ; greenhouse gases ; latitude ; methane ; models ; nitrogen ; nitrous oxide ; rivers ; seasonal variation ; surface water ; tropics ; turbulent flow ; wind ; Australia
    Language English
    Dates of publication 2014-0215
    Size p. 719-729.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2013.11.085
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 949: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  5. Article: Prioritizing management actions for the conservation of freshwater biodiversity under changing climate and land-cover

    Mantyka-Pringle, Chrystal S / Tara G. Martin / David B. Moffatt / James Udy / Jon Olley / Nina Saxton / Fran Sheldon / Stuart E. Bunn / Jonathan R. Rhodes

    Biological conservation. 2016 May, v. 197

    2016  

    Abstract: Freshwater ecosystems are declining under climate change and land-use change. To maximize the return on investment in freshwater conservation with limited financial resources, managers must prioritize management actions that are most cost-effective. ... ...

    Abstract Freshwater ecosystems are declining under climate change and land-use change. To maximize the return on investment in freshwater conservation with limited financial resources, managers must prioritize management actions that are most cost-effective. However, little is known about what these priorities may be under the combined effects of climate and land-cover change. We present a novel decision-making framework for prioritizing conservation resources to different management actions for the conservation of freshwater biodiversity. The approach is novel in that it has the ability to model interactions, rank management options for dealing with conservation threats from climate and land-cover change, and integrate empirical data with expert knowledge. We illustrate the approach using a case study in South East Queensland (SEQ), Australia under climate change, land-cover change and their combined effects. Our results show that the explicit inclusion of multiple threats and costs results in quite different priorities than when costs and interactions are ignored. When costs are not considered, stream and riparian restoration, as a single management strategy, provides the greatest overall protection of macroinvertebrate and fish richness in rural and urban areas of SEQ in response to climate change and/or urban growth. Whereas, when costs are considered, farm/land management with stream and riparian restoration are the most cost-effective strategies for macroinvertebrate and fish conservation. Our findings support riparian restoration as the most effective adaptation strategy to climate change and urban development, but because it is expensive it may often not be the most cost-efficient strategy. Our approach allows for these decisions to be evaluated explicitly.
    Keywords biodiversity ; case studies ; climate ; climate change ; cost effectiveness ; decision making ; expert opinion ; farms ; fish ; freshwater ; freshwater ecosystems ; land cover ; land use change ; macroinvertebrates ; managers ; natural resources conservation ; streams ; urban areas ; urbanization ; Queensland
    Language English
    Dates of publication 2016-05
    Size p. 80-89.
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0006-3207
    DOI 10.1016/j.biocon.2016.02.033
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: A review of Australian approaches for monitoring, assessing and reporting estuarine condition: II. State and Territory programs

    Hallett, Chris S / Adam Pope / Bronwyn M. Gillanders / Christine Crawford / D. Jeff Ross / Fiona Valesini / James Udy / Jan Barton / Julia Fortune / Kathryn Martin / Paul Maxwell / Peter Scanes / Qifeng Ye / Simon Townsend / Tim Glasby

    Elsevier Ltd Environmental science & policy. 2016 Dec., v. 66

    2016  

    Abstract: In contrast to Europe, the USA and South Africa, Australia has no specific, overarching federal legislation to underpin a nationally-coordinated framework for monitoring, assessing and reporting estuarine condition. This has resulted in a complex mosaic ... ...

    Abstract In contrast to Europe, the USA and South Africa, Australia has no specific, overarching federal legislation to underpin a nationally-coordinated framework for monitoring, assessing and reporting estuarine condition. This has resulted in a complex mosaic of diverse approaches and governance structures, hindering the ability to make inter-State comparisons. In this second part of a comprehensive three-part review, we present a systematic appraisal of current and impending approaches for measuring and reporting estuarine condition in each of Australia’s States and Territories. A concise summary is provided in each case, supported by extensive appendices containing detailed accounts of relevant monitoring and reporting programs. We synthesise and evaluate this output at the State/Territory level, highlighting areas of improvement and major gaps.
    Keywords estuaries ; governance ; laws and regulations ; monitoring ; Australia ; Europe ; South Africa ; United States
    Language English
    Dates of publication 2016-12
    Size p. 270-281.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 1454687-5
    ISSN 1462-9011
    ISSN 1462-9011
    DOI 10.1016/j.envsci.2016.07.013
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 7104: Show issues

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  7. Article: Unravelling complexity in seagrass systems for management: Australia as a microcosm

    Kilminster, Kieryn / Kathryn McMahon / Michelle Waycott / Gary A. Kendrick / Peter Scanes / Len McKenzie / Katherine R. O'Brien / Mitchell Lyons / Angus Ferguson / Paul Maxwell / Tim Glasby / James Udy

    Science of the total environment. 2015 Nov. 15, v. 534

    2015  

    Abstract: Environmental decision-making applies transdisciplinary knowledge to deliver optimal outcomes. Here we synthesise various aspects of seagrass ecology to aid environmental decision-making, management and policy. Managers often mediate conflicting values ... ...

    Abstract Environmental decision-making applies transdisciplinary knowledge to deliver optimal outcomes. Here we synthesise various aspects of seagrass ecology to aid environmental decision-making, management and policy. Managers often mediate conflicting values and opinions held by different stakeholders. Critical to this role is understanding the drivers for change, effects of management actions and societal benefits. We use the diversity of seagrass habitats in Australia to demonstrate that knowledge from numerous fields is required to understand seagrass condition and resilience. Managers are often time poor and need access to synthesised assessments, commonly referred to as narratives. However, there is no single narrative for management of seagrass habitats in Australia, due to the diversity of seagrass meadows and dominant pressures. To assist the manager, we developed a classification structure based on attributes of seagrass life history, habitat and meadow form. Seagrass communities are formed from species whose life history strategies can be described as colonising, opportunistic or persistent. They occupy habitats defined by the range and variability of their abiotic environment. This results in seagrass meadows that are either transitory or enduring. Transitory meadows may come and go and able to re-establish from complete loss through sexual reproduction. Enduring meadows may fluctuate in biomass but maintain a presence by resisting pressures across multiple scales. This contrast reflects the interaction between the spatial and temporal aspects of species life history and habitat variability. Most management and monitoring strategies in place today favour enduring seagrasses. We adopt a functional classification of seagrass habitats based on modes of resilience to inform management for all seagrass communities. These concepts have world-wide relevance as the Australian case-studies have many analogues throughout the world. Additionally, the approach used to classify primary scientific knowledge into synthesised categories to aid management has value for many other disciplines interfacing with environmental decision-making.
    Keywords attitudes and opinions ; biomass ; case studies ; decision making ; habitats ; issues and policy ; life history ; management systems ; meadows ; monitoring ; seagrasses ; sexual reproduction ; stakeholders ; Australia
    Language English
    Dates of publication 2015-1115
    Size p. 97-109.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2015.04.061
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 949: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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