Specialist scientists at a workshop in Perth this week have been identifying a treasure trove of marine sponges and have confirmed unexpectedly high biodiversity in deep Western Australian waters off Ningaloo Reef.
More than 1,000 sponge samples were obtained from a joint AIMS/Geoscience Australia research cruise to the Ningaloo Reef region off the Western Australian coast in 2008. The project was funded by the Marine Biodiversity Hub of the Commonwealth Environment Research Facilities (CERF) initiative that supports public-good environmental research throughout Australia.
The samples complement more than 600 invertebrate species that have been collected from deep waters of Ningaloo Reef through previous expeditions by the Australian Institute of Marine Sciences and the Western Australian Museum.
Senior Curator at the Western Australian Museum, Dr Jane Fromont, said that some of the species found on the survey were rare and strange, such as the stony sponges that are quite different to the more familiar soft bath sponges. A renowned international expert on these Lithistid sponges, Dr Andrzej Pisera from the Institute of Paleobiology in Warsaw, Poland, is at the workshop identifying animals from this group.
"Many of samples being examined by the team of taxonomists at the workshop are either new discoveries for Western Australia or new to science," Dr Fromont said.
The new collections of sponges were gathered from the sea floor in waters between 20 and 120 metres deep and were accompanied by a rich profusion of other floor-dwelling marine life including corals, sea whips, sea fans and basket stars.
"These animals are all filter feeders and the richness of their communities points to highly productive plankton food sources around Ningaloo that we believe are fuelled by the regular upwelling of deep nutrient-rich waters," Dr Battershill said.
"Sponges have existed in the sea for hundreds of millions of years. This long history has allowed them to evolve into diverse forms so that they can live in an extensive range of marine environments from the tidal zone to the floors of the deep ocean," he said.
Ningaloo Reef is one of the largest and least studied coral reef ecosystems in the world. Filling the gaps in understanding patterns and processes of tropical marine biodiversity in this system is a priority for AIMS.
