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Dive into the research topics where Daniel P Harrison is active.

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Featured researches published by Daniel P Harrison.


Frontiers in Microbiology | 2016

Bacterioplankton Dynamics within a Large Anthropogenically Impacted Urban Estuary

Thomas C. Jeffries; Maria Luiza Schmitz Fontes; Daniel P Harrison; Virginie Van-Dongen-Vogels; Bradley D. Eyre; Peter J. Ralph; Justin R. Seymour

The abundant and diverse microorganisms that inhabit aquatic systems are both determinants and indicators of aquatic health, providing essential ecosystem services such as nutrient cycling but also causing harmful blooms and disease in impacted habitats. Estuaries are among the most urbanized coastal ecosystems and as a consequence experience substantial environmental pressures, providing ideal systems to study the influence of anthropogenic inputs on microbial ecology. Here we use the highly urbanized Sydney Harbor, Australia, as a model system to investigate shifts in microbial community composition and function along natural and anthopogenic physicochemical gradients, driven by stormwater inflows, tidal flushing and the input of contaminants and both naturally and anthropogenically derived nutrients. Using a combination of amplicon sequencing of the 16S rRNA gene and shotgun metagenomics, we observed strong patterns in microbial biogeography across the estuary during two periods: one of high and another of low rainfall. These patterns were driven by shifts in nutrient concentration and dissolved oxygen leading to a partitioning of microbial community composition in different areas of the harbor with different nutrient regimes. Patterns in bacterial composition were related to shifts in the abundance of Rhodobacteraceae, Flavobacteriaceae, Microbacteriaceae, Halomonadaceae, Acidomicrobiales, and Synechococcus, coupled to an enrichment of total microbial metabolic pathways including phosphorus and nitrogen metabolism, sulfate reduction, virulence, and the degradation of hydrocarbons. Additionally, community beta-diversity was partitioned between the two sampling periods. This potentially reflected the influence of shifting allochtonous nutrient inputs on microbial communities and highlighted the temporally dynamic nature of the system. Combined, our results provide insights into the simultaneous influence of natural and anthropogenic drivers on the structure and function of microbial communities within a highly urbanized aquatic ecosystem.


International Journal of Global Warming | 2013

A method for estimating the cost to sequester carbon dioxide by delivering iron to the ocean

Daniel P Harrison

The need to find economical methods of CO2 sequestration is now urgent. Ocean iron fertilisation has been suggested as a low cost mitigation option to capture and store carbon. However, previous methods of estimating the cost fail to account for many of the losses and offsets occurring over the storage period. A method for calculating the net carbon stored from iron fertilisation of high nutrient low chlorophyll ocean regions is provided. Ship based fertilisation of the Southern Ocean is considered as a case study, on average, a single fertilisation is found to result in a net sequestration of 0.01 t C km–2 for 100 years at a cost of US


Environmental Microbiology Reports | 2016

Partitioning of fungal assemblages across different marine habitats

Thomas C. Jeffries; Nathalie J.A. Curlevski; Mark V. Brown; Daniel P Harrison; Martina A. Doblin; Katherina Petrou; Peter J. Ralph; Justin R. Seymour

457 per tonne CO2. Previous estimates of cost underestimate the economic challenge of distributing low concentrations of iron over large areas of the ocean surface, and the subsequent loss processes that result in only a small net storage of carbon per km2 fertilised. Technologies that could lower the cost are discussed.


Environmental Monitoring and Assessment | 2016

Development of an estuarine assessment scheme for the management of a highly urbanised catchment/estuary system, Sydney estuary, Australia

Gavin F. Birch; T. Gunns; D. Chapman; Daniel P Harrison

Fungi are a highly diverse group of microbes that fundamentally influence the biogeochemistry of the biosphere, but we currently know little about the diversity and distribution of fungi in aquatic habitats. Here we describe shifts in marine fungal community composition across different marine habitats, using targeted pyrosequencing of the fungal Internal Transcribed Spacer (ITS) region. Our results demonstrate strong partitioning of fungal community composition between estuarine, coastal and oceanic samples, with each habitat hosting discrete communities that are controlled by patterns in salinity, temperature, oxygen and nutrients. Whereas estuarine habitats comprised a significant proportion of fungal groups often found in terrestrial habitats, the open ocean sites were dominated by previously unidentified groups. The patterns observed here indicate that fungi are potentially a significant, although largely overlooked, feature of the oceans microbiota, but greater efforts to characterize marine species are required before the full ecological and biogeochemical importance of marine fungi can be ascertained.


Scientific Data | 2018

A database of chlorophyll a in Australian waters

Claire H. Davies; Penelope Ajani; Linda H. Armbrecht; Natalia Atkins; Mark E. Baird; Jason M. Beard; Prudence Bonham; Michele Astrid Burford; Lesley Clementson; Peter Coad; C Crawford; Jocelyn Dela-Cruz; Martina A. Doblin; Steven Edgar; Ruth Eriksen; Jason D. Everett; Miles Furnas; Daniel P Harrison; Christel S. Hassler; Natasha Henschke; Xavier Hoenner; Timl Ingleton; Ian Jameson; John K. Keesing; Sophie C. Leterme; James McLaughlin; Margaret Miller; David Moffatt; Andrew Moss; S. Nayar

As coastal populations increase, considerable pressures are exerted on estuarine environments. Recently, there has been a trend towards the development and use of estuarine assessment schemes as a decision support tool in the management of these environments. These schemes offer a method by which complex environmental data is converted into a readily understandable and communicable format for informed decision making and effective distribution of limited management resources. Reliability and effectiveness of these schemes are often limited due to a complex assessment framework, poor data management and use of ineffective environmental indicators. The current scheme aims to improve reliability in the reporting of estuarine condition by including a concise assessment framework, employing high-value indicators and, in a unique approach, employing fuzzy logic in indicator evaluation. Using Sydney estuary as a case study, each of the 15 sub-catchment/sub-estuary systems were assessed using the current scheme. Results identified that poor sediment quality was a significant issue in Blackwattle/Rozelle Bay, Iron Cove and Hen and Chicken Bay while poor water quality was of particular concern in Duck River, Homebush Bay and the Parramatta River. Overall results of the assessment scheme were used to prioritise the management of each sub-catchment/sub-estuary assessed with Blackwattle/Rozelle Bay, Homebush Bay, Iron Cove and Duck River considered to be in need of a high priority management response. A report card format, using letter grades, was employed to convey the results of the assessment in a readily understood manner to estuarine managers and members of the public. Letter grades also provide benchmarking and performance monitoring ability, allowing estuarine managers to set improvement targets and assesses the effectiveness of management strategies. The current assessment scheme provides an effective, integrated and consistent assessment of estuarine health and provides an effective decision support tool to maximise the efficient distribution of limited management resources.


Lecture Notes in Engineering and Computer Science | 2008

Engineering Ocean Nourishment

Bruce Judd; Daniel P Harrison; Ian S. F. Jones

Chlorophyll a is the most commonly used indicator of phytoplankton biomass in the marine environment. It is relatively simple and cost effective to measure when compared to phytoplankton abundance and is thus routinely included in many surveys. Here we collate 173, 333 records of chlorophyll a collected since 1965 from Australian waters gathered from researchers on regular coastal monitoring surveys and ocean voyages into a single repository. This dataset includes the chlorophyll a values as measured from samples analysed using spectrophotometry, fluorometry and high performance liquid chromatography (HPLC). The Australian Chlorophyll a database is freely available through the Australian Ocean Data Network portal (https://portal.aodn.org.au/). These data can be used in isolation as an index of phytoplankton biomass or in combination with other data to provide insight into water quality, ecosystem state, and relationships with other trophic levels such as zooplankton or fish.


Handbook of Microalgal Culture: Applied Phycology and Biotechnology, Second Edition | 2013

The enhancement of marine productivity for climate stabilization and food security.

Ian S. F. Jones; Daniel P Harrison


Environmental Research Letters | 2017

Global negative emissions capacity of ocean macronutrient fertilization

Daniel P Harrison


Fisheries Oceanography | 2017

The pelagic habitat analysis module for ecosystem-based fisheries science and management

Daniel P Harrison; Michael G. Hinton; Suzanne Kohin; Edward M. Armstrong; Stephanie Snyder; Frank O'Brien; Dale K. Kiefer


Fisheries Oceanography | 2018

Habitat analysis of the commercial tuna of the Eastern Tropical Pacific Ocean

Chen Hu; Daniel P Harrison; Michael G. Hinton; Zachary C. Siegrist; Dale A. Kiefer

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Michael G. Hinton

Inter-American Tropical Tuna Commission

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T. Gunns

University of Sydney

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Stephanie Snyder

National Oceanic and Atmospheric Administration

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Suzanne Kohin

National Oceanic and Atmospheric Administration

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Andrew Moss

Queensland Environmental Protection Agency

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Bradley D. Eyre

Southern Cross University

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