Professor Thomas Schlacher | UniSC | University of the Sunshine Coast, Queensland, Australia

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Professor Thomas Schlacher

PhD P.Elizabeth, MSc Vienna

  • Professor, Marine Science
+61 7 5430 2847
Office location
H1.1.51, Building H, USC Sunshine Coast
Sunshine Coast
Thomas Schlacher

Research Themes

Thomas's scientific interests and work spans four broad thematic areas:

1. Ecological Interfaces: beaches, surf zones, dunes, estuaries

Interfaces are ubiquitous in the biosphere, forming hotspots of material processing, exchanges, biodiversity, and habitat heterogeneity. These interfaces couple ecosystems through the exchange of nutrients, material and organisms. I primarily work on two types of interfaces that represent the single longest interface on the planet – sandy beaches (as boundaries between the oceans and the land), and on interfaces that are sites of important interactions between society and coastal systems: estuaries. My published work and research projects examine both the structural properties of these interfaces and the processes which make them uniquely fascinating locations for ecologists. A major current effort in our research group is to identify the interplay of various drivers that shape fish assemblages in estuarine seascapes; what is increasingly evident is that a complex interaction exists between fish and the features of the seascape they inhabit. A similar effort is underway in the surf zone of ocean beaches, showing previously unrecognized diversity of fish in these dynamic environments. Some of the functional aspects which my lab investigates include the biological processing of animal carcasses at the land-ocean boundary (‘scavenger ecology’) and the role of carbon exchanges in spatially-coupled food webs (‘trophic linkages’).

2. Deep-Sea Ecology: continental margins, seamounts, submarine canyons.

The deep sea is the single largest biome of the planet, and perhaps the one last true frontier in ocean science. I have a long-standing interest and research stream in deep-sea ecology and conservation, focusing on seamounts (undersea mountains), continental margins, and submarine canyons. Each of these habitats is characterised by under-reported habitat heterogeneity and complexity of the seascape, and harbours highly diverse animal communities. My work has challenged conventional paradigms about elevated endemism and productivity of isolated topographic features, provided spatial data as biological input for conservation planning in the deep sea, and highlights the vulnerability of deep-sea systems to fishing and mining; the mining of the deep seabed has potentially massive environmental implications in coming years, and this aspect of my research (together with broader conservation questions) is gaining further momentum.

3. Biological Conservation: from indicators to spatial solutions

I strive to be ethically responsible by articulating my research work into society and the broader environment to achieve benefits beyond academia. To this end, a sizeable part of my research concerns questions about the environmental effects of human activities, and the strategies that are most effective in conserving vulnerable and irreplaceable features of the natural environment. There are several themes in this line of research: i.) the development of accurate pollution indicators in estuaries and marine waters (e.g. fish health, isotopes); ii) scientifically robust assessments of the consequences that urbanisation and recreation have for coastal dunes and beaches; iii) improvements to metrics used to gauge environmental conditions and monitor the effectiveness of management interventions; iv) evaluating impacts of bottom-trawling on seafloor communities; v) developing strategies to lower conflicts between humans and wildlife; and iv) the identification of areas of special biological significance on the High Seas. These projects involve international partners (e.g. ISA – International Seabed Authority, CBD – Convention on Biological Diversity) and a sizeable network of international collaborators.

4. Habitat Restoration: oyster reefs and beyond

In a world where options for conservation that seek to regulate detrimental activities of humans can increasingly be limited, restoring key habitats and ecological processes becomes a sensible and efficient option. Our group has over the last few years applied this philosophy to estuarine oyster reefs in Eastern Australia. These ecosystems collapsed near catastrophically around the middle of the last century to the point of being now quasi functionally extinct in many coastal systems. With sterling support from several key partners (e.g. Noosa Council, TNC, Noosa Biosphere Foundation, Healthy Land & Water) we have designed and installed a number of reefs with a ‘twist’: from the outset we have incorporated key lessons from modern seascape ecology, emphasizing connectivity of reefs to the mosaic of alternative estuarine habitats (e.g. mangroves, seagrass meadows) and the ocean (to facilitate recruitment of fish and oysters). More broadly, our ‘scientific philosophy’ to restoration involves explicit recognition of spatial principles long-established in biological conservation and empirical data on ‘habitat values’.

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Current grants

Chief Investigator(s)/Years
Project Title/Funding Body/Role - Schlacher
Grant value (AUD)

Schlacher TA, Gloster M, Gillies C, Game E, Olds A, Gilby B, Walker S (2016 - 2018) Bringing back Noosa's fish. Noosa Biosphere Reserve Foundation; Lead CI.


O’Hara T, Wilson R, Rowden A, Schlacher TA, Ahyong S, Bruce N, King R, Hubble T, Glover A, McCallum A (2015 - 2016) Sampling the abyss: latitudinal biodiversity patterns along the base of Australia’s eastern continental margin. Marine National Facility; CI.


Olds A, Schlacher TA, Gilby B, Connolly R, Sheaves M, Flint N (2017 - 2018) Environmental features shape habitat values for fish: effects on diversity and productivity in Central Queensland estuaries. Department of Environment & Heritage Protection; CI.


Connolly R, Rasheed M, Sheaves M, York P, Schlacher TA, Olds A (2017 - 2018) The value of tidal wetland habitats in sustaining fisheries production. Department of Environment & Heritage Protection; CI.


Connolly RM, Schlacher TA (2015 - 2017) Connectivity and resilience: factors determining the resistance and recovery of aquatic systems to disturbance. Australian Research Council (ARC) - Discovery Projects (DP); CI.


Schlacher TA, Olds AD, Weston M, Gilby BL, Connolly R (2016 - 2020) Bird Diversity and Exotic Species of Coastal Dunes and Sandy Beaches. Sekisui House; Lead CI.



Key publications of Thomas Schlacher are also available from Google scholar and Researchgate.

Research projects for Honours, Masters and PhD students

  • Extreme trophic subsidies: when island biogeography meets food-web ecology on remote Pacific Islands.
  • Connectivity and resilience in ecosystems: what makes natural systems resist and recover from disturbance?
  • Whole ecosystem effects of scavengers: some serious scaling-up of food-web experiments.
  • Assembly rules for scavenger guilds: testing fundamental processes in ecology with new models.
  • Submarine canyons on Australia’s continental margin: what drives elevated biomass and diversity of deep-sea fauna in highly complex sea.
  • Reserves and cross-boundary fluxes: the many faces of connectivity in achieving conservation success in marine systems.
  • Putrefaction and carrion palatability: how much do scavengers care about microbiology?
  • Food-web effects of apex predators: are introduced foxes functionally equivalent to dingos on sandy beaches?
  • More to land-ocean gradients: estuaries as scavenging corridors in the coastal zone.

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Research areas

  • ecology of ocean beaches and coastal dunes
  • scavengers & carrion-based food webs
  • connectivity and resilience in modular ecosystems
  • restoration of oyster reefs to enhance fish and fisheries
  • drivers of fish diversity and assemblages in estuarine seascapes
  • community assembly in variable habitats
  • deep-sea biology (submarine canyons, seamounts)
  • dynamics of carbon processing at ecological interfaces
  • metrics in environmental management and conservation
  • connectivity and cross-system coupling

Teaching areas

  • Marine Ecology
  • Animal Ecology
  • Biological Conservation
  • Environmental Management

Professor Schlacher's specialist areas of knowledge include: science, oceanography, marine ecology, coastal ecology, conservation, pollution, Fraser Island, deep-sea communities

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