Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Sydney harbors deadly diet for sea creatures

08.04.2008
Contaminated seaweeds in Sydney Harbour could be threatening the small animals that feed on them, according to a new study revealing that the harbour's seaweeds have the world's highest levels of copper and lead contamination.

Up to 75 percent of the offspring of small crustaceans that feed on a common brown seaweed, for example, are killed when they are exposed to copper at levels found in some parts of the harbour, UNSW laboratory and field experiments have shown.

The UNSW study sampled seaweed from 10 bays within the harbour, ranging from 3km to 11km from Sydney Heads. Concentrations of copper, lead and zinc in a species of brown seaweed found in Woolloomooloo Bay, Balls Head Bay and Rushcutters Bay equal or exceed levels found in the Hong Kong Islands and Brazil's Sepetiba Bay, which are among the world's most heavy metal-contaminated waterways.

Heavy metals such as copper, lead and zinc find their way into Sydney Harbour from stormwater runoff, industrial waters and motorised watercraft. These seaweeds "bioaccumulate" metals inside their tissues and scientists use them to monitor environmental pollutants.

Published in an upcoming issue of the journal Environmental Pollution, it is the first investigation of the geographic relationship between metal contamination in seaweeds and the crustaceans that feed on them.

The study reveals that high concentrations of copper in one seaweed species (Padinacrassa) were associated with a low abundance of grazing amphipods - small shrimp-like creatures - that feed on algae. These creatures are highly abundant in all marine habitats: on average there are some 6,000 animals per square metre of algal bed in Sydney Harbour.

"The habitats that we sampled within Sydney Harbour contain among the highest concentrations of metals yet identified in brown seaweeds," says study lead author, Dr David Roberts.

"In seven of the 10 sample harbour sites, we measured copper concentrations in one seaweed species that exceeded levels known to threaten small crustaceans. These concentrations exceed all previously scientifically reported levels."

David Roberts | EurekAlert!
Further information:
http://www.UNSWalumni.com

More articles from Ecology, The Environment and Conservation:

nachricht Dry landscapes can increase disease transmission
20.06.2018 | Forschungsverbund Berlin e.V.

nachricht 100 % Organic Farming in Bhutan – a Realistic Target?
15.06.2018 | Humboldt-Universität zu Berlin

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Temperature-controlled fiber-optic light source with liquid core

In a recent publication in the renowned journal Optica, scientists of Leibniz-Institute of Photonic Technology (Leibniz IPHT) in Jena showed that they can accurately control the optical properties of liquid-core fiber lasers and therefore their spectral band width by temperature and pressure tuning.

Already last year, the researchers provided experimental proof of a new dynamic of hybrid solitons– temporally and spectrally stationary light waves resulting...

Im Focus: Overdosing on Calcium

Nano crystals impact stem cell fate during bone formation

Scientists from the University of Freiburg and the University of Basel identified a master regulator for bone regeneration. Prasad Shastri, Professor of...

Im Focus: AchemAsia 2019 will take place in Shanghai

Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.

Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...

Im Focus: First real-time test of Li-Fi utilization for the industrial Internet of Things

The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.

Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.

Im Focus: Sharp images with flexible fibers

An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.

Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Munich conference on asteroid detection, tracking and defense

13.06.2018 | Event News

2nd International Baltic Earth Conference in Denmark: “The Baltic Sea region in Transition”

08.06.2018 | Event News

ISEKI_Food 2018: Conference with Holistic View of Food Production

05.06.2018 | Event News

 
Latest News

Controlling robots with brainwaves and hand gestures

20.06.2018 | Information Technology

Electron sandwich doubles thermoelectric performance

20.06.2018 | Power and Electrical Engineering

Intelligent maps will help robots navigate in your home

20.06.2018 | Information Technology

VideoLinks
Science & Research
Overview of more VideoLinks >>>