Museum veteran carefully conserving shipwreck treasures
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Shipwrecks may capture the imagination, but the job of retrieving what is left behind from reefs, rocky coastlines and the seabed beneath wild oceans is painstaking and at times challenging.

Western Australian Museum conservator Jon Carpenter, who has dived on ship and aircraft wrecks around Australia and overseas, said safely delivering the historic pieces to shore required meticulous planning and careful packing.

Mr Carpenter has worked at the museum since 1974 and gave a presentation to senior school students as part of the Western Australian Marine Science Institution’s Thinking Blue outreach program.

Some of the objects he’s helped recover and conserve are displayed at the WA Shipwrecks Museum in Fremantle. These include a cast iron cannon from Australia’s earliest shipwreck, Trial (wrecked in 1622) and a wrought iron anchor from the Zuytdorp (1712). Other objects, now located at the Museum of Tropical Queensland, are a silver pocket watch and pistol from HMS Pandora (1791).

“Objects that we recover from the ocean have absorbed water and incorporated salts and have been altered by it,” Mr Carpenter said.

“It is important that they are kept in wet storage, to prevent damage due to drying, corrosion and crystallization of salts,” he said.

“If an organic object such as one made of waterlogged wood dries out before impregnation or consolidation treatment it will irreversibly shrink, crack and distort.”

To avoid the potential for osmotic shock, ceramic objects recovered from the sea are initially soaked in seawater diluted with freshwater, and eventually desalinated completely in freshwater.

“Legislation protects underwater archaeological sites so you cannot indiscriminately recover material. You must also know how to conserve it properly,” he said.

On a wreck site, buried objects are uncovered using an airlift or water dredge which operate like an underwater vacuum cleaner. It is safer to expose an object by using a hand to fan the sand to mobilize it and allow the vacuum to carry it away.

Mr Carpenter said the material a vessel was made of, the location where it sank and the prevailing environment on the seafloor all affect how well it is preserved more than the time it’s spent underwater.

“When a ship is buried, and the environment is stable it is usually conducive to preservation and that is why the remains of many shipwrecks are more than 2,000 years old,” Mr Carpenter said.

Dozens of ships have been wrecked along Western Australia’s coast and include Batavia (1629), the Vergulde Draeck or Gilt Dragon (1656), Zeewijk (1727), Xantho (1872) and Omeo (1905).

“When you uncover personal belongings like the watch from HMS Pandora, it is a reminder that people were on board and may have lost their lives.”

The Zuytdorp, wrecked near present day Kalbarri, is the only Dutch East India Company ship to have run into the coast of the Australian mainland rather than on a reef or island.

Mr Carpenter said ships wreck because they are in the wrong place either by human error or by loss of control. Working these sometimes dangerous locations can also pose challenges to marine archaeologists and conservators centuries later.

Diving on the Zuytdorp, at the base of coastal cliffs, was one area where the diving team had to be aware of the risks and take particular caution.

Mr Carpenter said while the objects have been recovered from many shipwrecks and after conservation displayed in museums some wrecks such as HMAS Sydney II are designated war graves and will remain untouched.

Jon Carpenter’s presentation: Shipwreck to Showcase is available to view on WAMSI’s YouTube channel.

 

 

The messy, muddy work retrieving recorders from the sea floor

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They are moments of excitement mixed with relief when researchers pull up their mud and weed covered hydrophones and recorders which have spent months on the seafloor quietly capturing the sounds of weather, marine life, boats and ships.

The equipment used for the ‘Noise’ theme project in the WAMSI Westport Marine Science Program was put out three times over a year in Cockburn Sound and left under water for four months.

The research team carefully noted the coordinates of the devices when they lowered them under water and connected them by rope to weights to stop them drifting.

The underwater recorders contain enough batteries to sustain them through the months of data collection and are built to withstand the pressures of saltwater, sediment and sometimes rough weather conditions.

Because of the boating and fishing activity in Cockburn Sound the team decided not to attach the devices to floats which would increase the possibility of ropes becoming snagged in propellers.

When it comes time to retrieve the devices, the team takes its boat to the drop sites using the GPS coordinates and uses a hook to grab the line. It can feel like looking for a needle in a haystack.

When they are found, the recorders are usually covered in mud and some are tangled in seagrass but once they are cleaned the precious data is retrieved.

What’s downloaded are the sounds of the Sound. There are wind and bubbles, jet skis, boats, large ships but also fish, dolphins, crabs and many noisy shrimp.

 

 

 

‘More than just teeth’: Shark Deck inspires respect for sharks

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Spotting a shark while snorkelling as a child then, in a flash, realising it was gone was an early lesson on these supposed ‘monsters of the deep’ for marine biologist Dr Charlotte Birkmanis.

“I was 10 when I first saw a shark and I remember thinking that here was an animal that I’m supposed to be afraid of, but it couldn’t get away fast enough,” Dr Birkmanis said.

It fuelled a passion for ocean life in the scientist, who recently released Shark Deck, featuring 50 species of sharks with images of sharks on one side and information, including their diet, size, and one of her ‘fin facts’ on the back.

When the Director of the philanthropic Jock Clough Marine Foundation wrote Shark Deck, she made a point of including lesser-known species as well as the better-known tiger and great white sharks.

“There are more than 530 species of sharks in the world, yet we commonly only hear about a handful of them,” she said.

The variety is extraordinary —there is the bus-sized whale shark, the yellowish lemon shark and the tiny ‘glow in the dark’ pocket shark.

“The more I have learned about sharks, the more I am fascinated by them and I love sharing this with others through books, radio and television,” Dr Birkmanis said.

“I do a lot of public talks and interviews about sharks and our oceans, and I try to get people to think about sharks as more than just their teeth. I like to remind them the largest sharks eat plankton.”

Despite the facts about the animals, headlines scream about sharks stalking, lurking, attacking and prowling. They are described as rogues and monsters.

Many have alarmingly low populations and are threatened so Dr Birkmanis was delighted when The Washington Post recommended Shark Deck as “engaging” with “cool facts about the shark’s biology, habitat, range and more”.

Dr Birkmanis, an Adjunct Research Fellow at The University of Western Australia’s Oceans Institute, said the interest shown for the animals when she gives talks to schools and community groups and shares information on television and in social media was encouraging. So much so she’s been given the title of ‘PR Manager for sharks’.

“I think there is a genuine interest in sharks, but a lot of the scientific material is inaccessible,” she said.

Dr Birkmanis has tagged and dived with sharks across the Indian Ocean, in places such as the Chagos, Mozambique and South Africa, including white sharks.

“The way they move is incredible,” Dr Birkmanis said.

She is now continuing her research on sharks as a Postdoctoral Research Fellow with the Max Planck Centre, looking at shark movement, behaviour and how they may even be able to help us heal.

The Shark Deck follows Dr Birkmanis’ children’s book Little Shark Lulu is sleeping, a fun fact-filled fable about what goes on in the ocean when the sun goes down, told through the eyes of a little shark named Lulu. Notably Lulu has no teeth.

Ground breaking data sharing project to better inform environmental assessments

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A ground breaking project, to securely share data from industry, academia and government and better inform environmental approval processes, has been launched in Perth this morning by Western Australian Science Minister Stephen Dawson.

The Shared Environmental Analytics Facility (SEAF), which now has pilot programs in Cockburn Sound and the Pilbara, takes data from a broad range of sources to support environmental impact assessments and to create useful products such as maps, reports and forecasting tools.

SEAF was developed by The Western Australian Biodiversity Science Institute (WABSI) and the Western Australian Marine Science Institution (WAMSI), which have been joined by the National Collaborative Research Infrastructure Strategy (NCRIS) funded Australian Research Data Commons (ARDC) for the next stage of the program.

WABSI CEO Professor Owen Nevin said it was an exciting project that met a local and global demand for more information about cumulative pressures on the environment.

“The key benefit of SEAF is that it unlocks the real value of environmental information available. It transforms science and shared data into useable tools, enabling decision-makers from industry, government and regulators to make more robust, repeatable and sustainable decisions,” Professor Nevin said.

The two pilot studies in Western Australia have been broadly supported by industries in the regions.

WAMSI CEO Dr Luke Twomey said it was important to help decision makers by consolidating as much scientific information as possible in areas where a population was having an impact on the marine environment and landscape.

This ultimately would inform important decisions.

“The pilot studies are a significant way of demonstrating that we can securely share the results of research across different sectors,” Dr Twomey said.

ARDC CEO Rosie Hicks said, “This is a smart new way of sharing information with good governance and strong IT protections to help regulators and industry make better decisions.”

Science Minister Stephen Dawson commended the collaboration and commitment by WABSI and WAMSI to create and develop their Data and Information Management Program.

“This is a world leading innovation research project being progressed in Western Australia that can dramatically change the way environmental approvals and assessments are prepared and progressed using the latest digital data available,” Minister Dawson said.

“The project can be a game changer for government, industries, regulators and the private sector in sourcing reliable, consistent and easy to access environmental information as part of their decision-making processes.”

“I have been lucky enough to be involved in the development of this ground breaking project for a number of years and I am very pleased these pilot projects in the Cockburn Sound and the Pilbara are being launched and progressed,” Minister Dawson said.

“Our government has invested significantly in bringing this project to fruition and this milestone is another example of how we’re supporting and advancing scientific research and innovation to enhance biodiversity outcomes for WA.”

Protections around accessing the data will work in a similar way to the sharing of health data, where there are access restrictions around confidentiality.

Environmental Protection Authority (EPA) Deputy Chair Lee McIntosh said a shared mechanism for consolidating and interpreting environmental data would be a very valuable tool for environmental impact assessment.

“The EPA welcomes any initiative that helps deliver protection and good environmental outcomes for our State’s significant assets,” Ms McIntosh said.

“I particularly look forward to this collaboration improving our understanding of cumulative impacts through well managed biodiversity data.”

You can find more information at the SEAF website: www.seaf.org.au

Ship safety system helping Sound’s noise research

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A safety system that tracks ships and helps prevent collisions is being used as part of a study of noise levels in Cockburn Sound and their potential impact on marine life.

Cristina Tollefsen from Curtin University said researchers were using ship location information from the worldwide Automatic Identification System along with data from recorders on the seabed.

At the start of the project, researchers placed recorders with hydrophones (underwater microphones) at nine locations in and around the Sound.

“AIS gives us details of ships and their location which means we can attribute portions of the recording to certain vessel types,” Dr Tollefsen said.

“Because we can combine this information with data from the recorders, we have been able to measure the sound levels of all the different vessel classes from tugboats and the pilot vessel to the massive bulk carrier ships,” Dr Tollefsen said.

“Port activities require more than one vessel typically, so we wanted to capture a set of activities including the pilot boats meeting larger ships as they arrive and the tug boats assisting ships as they come into port.

“It’s less common in research to measure the combined noises but that is much more realistic.”

Dr Tollefsen, who is working on the project for the WAMSI Westport Marine Science Program, said there was growing awareness of the impact of noise on animals.

“Because light doesn’t penetrate very well under water, a lot of animals use sound to communicate,” Dr Tollefsen said.

“The best-known animals to do this are whales and dolphins but invertebrates and fish also use sound.

“If it’s too noisy from human activities, you can imagine that it’s harder for the animals to find a mate or find food.

“That’s why we’re doing this work is to understand the sounds in Cockburn Sound and whether there are ways to estimate a potential increase in noise or mitigate any increase if shipping traffic were to increase.”

Dr Tollefsen said a port in Vancouver, Canada had implemented a strategy to slow vessels on approach as a way of protecting the endangered population of orcas in the area.

She said by slowing the vessels, similar to a maritime equivalent of a traffic school zone, they had made the waters less noisy with the aim of reducing the impact of human-caused noise on the marine mammals.

Indigenous led research vessel launched with dockside cultural smoking ceremony

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A newly-refurbished vessel was launched today to be used for a landmark research, training and environment rehabilitation collaboration in Shark Bay – an area which has been hit hard by devastating marine heatwaves.

The 23-metre ‘Marine 2’ is owned by The Jock Clough Marine Foundation, which offered it to the Indigenous-owned and operated Tidal Moon for its exclusive use. The event took place with a dockside cultural smoking ceremony at Fremantle’s Sardine Jetty.

Tidal Moon has a sea cucumber harvesting business and has applied for a license to help rehabilitate up to 1,000 square kilometres of seagrass in Shark Bay. The meadows were lost just over a decade ago in a series of marine heatwaves.

‘Marine 2’ will enable the training and employment of local Malgana People, as well as marine research delivered by the Western Australian Marine Science Institution (WAMSI) with its partners.

“Seagrass provides a vital habitat and breeding area for marine animals,” Mr Wear said.

“It also prevents the release of thousands of tonnes of carbon dioxide and is regarded as the ocean’s lungs.”

“Myself and Malgana Elders are honoured that Shark Bay’s Traditional Custodians will lead this exciting collaboration which brings together important marine research and innovative projects that benefit the environment.”

“We are combining Western marine science and Indigenous Sea Country knowledge.”

“This is also going to create new private sector job opportunities and give our young people new opportunities to care for Sea Country,” Mr Wear said.

WA philanthropist, businessman and Jock Clough Marine Foundation Co-Trustee, Jock Clough said he was looking forward to supporting the collaborative effort.

“This is a wonderful opportunity for Tidal Moon, with its Traditional Owners and custodians, WAMSI and the Jock Clough Marine Foundation to work together, and really make a difference to the knowledge of a very special place,” Mr Clough said.

WAMSI CEO Dr Luke Twomey said the organisation had developed a Science Plan for Shark Bay (Gathaagudu) and further research would provide essential data to help inform the way local and global marine ecosystems were managed. “Shark Bay is like the canary in the coalmine for climate change and our partner scientists will be able to make a real difference through this initiative,” Dr Twomey said.

Tidal Moon has been working with scientists from WAMSI’s partner institutions and with CSIRO to better understand the role of seagrass in Shark Bay’s ecosystem and the best ways to prevent future losses.

WAMSI manages major marine science projects through its partnership with Curtin University, Edith Cowan University, Murdoch University, The University of Western Australia as well as the Department of Biodiversity Conservation and Attractions, the Department of Water and Environmental Regulation, the Western Australian Museum, Australian Institute of Marine Science and the Department of Primary Industries and Regional Development.

Penguin ‘poop study’ to help unlock colony’s diet

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Researchers from The University of Western Australia and Murdoch University are analysing DNA from the excrement of little penguins in Cockburn Sound to find out what, other than fish, they are eating and whether it is affecting their breeding.

Penguin researcher Dr Belinda Cannell, from UWA, said analysing the animals’ diet in greater detail would provide an insight into their breeding and how it related to the availability of their primary diet, which is fish.

Little penguins in Cockburn Sound (their northern most range in Western Australia) primarily eat anchovies, pilchards, scaly mackerel and sandy sprat.

Penguins are known to also feed on crustaceans, cephalopods and even jellyfish.

“If it’s a poor year and there are not a lot of fish around, the little penguins may be feeding more on other things such as jellyfish,” Dr Cannell said.

This could then have an impact on their ability to produce and raise young.

“This other food may not get them into the condition where they can breed and feed their young,” Dr Cannell said.

“It may be that the chicks don’t fatten up as quickly.”

She said diet made up one element of the project, which is part of the WAMSI Westport Marine Science Program.

Another methodology being used to determine diet composition is the analysis of stable isotopes of carbon, nitrogen and sulphur from the down of little penguin chicks and feathers from adults.

“Stable isotopes of carbon reflect primary production sources and is more enriched in inshore, seagrass dominated areas, compared to offshore food webs,” Dr Cannell said.

“The stable isotope of nitrogen increases up the food chain and can also increase between size classes of the same prey species.”

“Stable isotopes of sulphur can be useful to distinguish between offshore and inshore components in food webs and can also indicate if producers are using sulphur from seawater, which is more enriched, or from sediments which are less enriched.

“This gives us a better idea of the whole diet of these birds.”

Dr Cannell said stable isotopes assist with establishing diet composition.

“I presume little penguins are eating jellyfish, but we haven’t had stable isotopes for jellyfish until now.”

The Western Australian Museum provided samples to assist with the research.

Cockburn Sound research reports now online

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Cockburn Sound research teams have started delivering project reports for their work on the WAMSI Westport Marine Science Program.

These are now published on WAMSI’s Cockburn Sound webpage under ‘Research Themes and Reports‘.

More than 100 scientists and researchers are working across 33 projects, helping to build a picture of the Sound’s environment and provide key input into the port design.

In one of the latest reports to be released, scientists have carried out a detailed literature review identifying potential invasive marine species which may have become established in Cockburn Sound, with procedures to mitigate the risk of introducing these to future Westport facilities.

Another project explores the potential effects of suspended sediment on fishes from dredging, while a social science study has identified and mapped 31 non-fishing recreational activities and 11 associated values for the Sound.

Reports will continue to be published on our website over the next few months.

 

Eco-design and pre-seeding among options to encourage healthy port marine life

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Pre-seeding new port structures to encourage the colonisation of native species is one of the mitigation measures against invasive marine plants and animals, outlined in a new report prepared for the WAMSI Westport Marine Science Program.

The literature review by Curtin University School of Molecular and Life Sciences Adjunct Professor Fred Wells lists many of the invasive marine species that have been recorded in waters around Perth and mitigation measures that could be used during any port construction.

Pre-seeding works by attaching local, fast-growing species to a new structure. The common mussel is one option identified in the report.

Professor Wells said invasive marine species were a worldwide problem and shipping was the most common way they spread to coastal areas. Ninety-eight percent of trade in and out of Australia is on vessels.

“Invasive marine species are concentrated on artificial surfaces and eco-engineering is a new field that attempts to encourage biodiversity and prevent potential marine pests taking hold,” Professor Wells said.

“The risk of introducing new species is greatest during construction but experience during the construction boom in the Pilbara demonstrated the issue is manageable.”

Professor Wells said eco-design was a new and evolving field that could help improve the biodiversity of the marine community that develops underwater, while minimising the risk of invasive species.

“Current design procedures tend to create uniform habitats, such as seawalls with smooth vertical faces. The lack of habitat diversity reduces the biodiversity of the marine community that develops on the structure. “

“Increasing the habitat diversity of new immersed structures and pre-seeding them with native species appear to be the most promising ways for mitigating against species that can cause ecological harm and prove expensive.”

Professor Wells said the biggest threats from invasive species to marine ecosystems were introducing disease, displacing native species, changing the ecology of native communities, clogging pipes and damaging other critical infrastructure.

The report, which was done to understand potential risks, is a literature review of invasive marine species from Cottesloe to Cockburn Sound, including waters around Fremantle and the Swan River.

A comprehensive survey more than a decade ago recorded 60 introduced marine species living in WA waters. Three were on the national marine pest list. Four additional marine pests were subsequently recorded in WA.

“Fortunately, most introduced marine species are apparently innocuous, causing no known adverse effects and we know only a small portion become pests,” Professor Wells said.

 

 

Sediment samples at the core of a model project

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Dozens of core samples, taken from sediment around Cockburn Sound, will play a crucial role in the creation of a model of the area’s ecosystem to help inform environmental assessment of the proposed port.

The work, being done as part of the WAMSI Westport Marine Science Program, involved divers collecting three sediment cores from 12 sites and scientists analysing them at a specially created laboratory nearby.

The project is being run by Professor Bradley Eyre from Southern Cross University and Professor Matthew Hipsey, from The University of Western Australia.

Professor Eyre said the tubes of sediment and water were set up in a laboratory, in the garage of a beachside home, where conditions simulated in situ temperature and changing light conditions between night and day, at the sediment surface.

“Some analysis is best done when we have fresh samples, so we wanted to avoid any delays,” Professor Eyre said.

“Other samples will be sent back to the Southern Cross University campus near Byron Bay, which has the only instrumentation in Australia for some of the analyses.”

The 12 locations in the Sound, represent different types of shallow and deep sediments including muds, seagrass meadows, and sandy areas.

“In the laboratory, we were measuring the flux of oxygen and nutrients in and out of sediment including nutrients such as ammonia and phosphate,” Professor Eyre said

“Some of the tubes contained sediment with seagrass growing in it.

“We are also measuring a critical process in the sediments called denitrification.

“Denitrification is a natural process by which ecosystems such as Cockburn Sound can remove nitrogen.”

“It is a really important cleansing process but if the carbon load gets too high the process can be reduced.”

The researchers said data from the sediment testing would underpin new water quality modelling of the Cockburn Sound ecosystem.

“The data complements other key experimental data being collected as part of the WAMSI Westport Marine Science Program on the chemical and biological conditions, allowing the development of Cockburn Sound Integrated Ecosystem Model platform to help manage the system,” Professor Hipsey said

“What we are measuring will reflect what is happening currently in the Sound and when used alongside the modelling we will be able to predict what will happen under future scenarios.”