Researchers from the Sydney Institute of Marine Science servicing the IMOS Acoustic Telemetry Network. Credit: Fabrice Jaine, SIMS.

News

New continental-scale data from the IMOS animal tracking system maps a decade of widespread marine species movement

The data published today in the prestigious Nature journal Scientific Data, has tracked the whereabouts of 117 marine species, ranging from sharks and saltwater crocs all the way to sea turtles and sea cows (dugongs), off the shores of Australia.

A new continental-scale marine animal tracking dataset has been published from the Integrated Marine Observing System’s Animal Tracking Facility, based on a permanent network of acoustic signal receivers installed in coastal waters around Australia, shedding light on the movements of some of our most majestic and dangerous sea creatures.

The resulting dataset consists of detections collected over 10 years by 3,777 tags deployed on 117 marine species, including sharks, crocodiles, fish and dugongs, with distances travelled by the animals ranging from a few to thousands of kilometres.

The system will allow researchers to track how our marine animals are responding to climate change-related issues, such as warming waters, lack of oxygen and ocean acidification.

The data is helping to unravel the widespread movements of Australian marine species, the researchers say, and provide insight into the natural habitats, distributions and changing behaviours of these animals in the face of climate change.

“The established IMOS Animal Tracking Facility network (which is operated by the Sydney Institute of Marine Science), consisting of nearly 2,000 receiving stations located around the country, allowed us to track 3,777 Australian sea animals, including some of Australia’s most iconic species, such as great white sharks, green sea turtles and tunas,” explained lead author Dr Xavier Hoenner from the Integrated Marine Observing System (IMOS).

“We collected and quality controlled 49.6 million acoustic detections from these tagged animals, which has given us insights into how far they moved, ranging from only a few kilometres to thousands, their preferred habitats and how their movements vary over time,” added Hoenner.

It has been known for some time that climate change is causing oceans around Australia to be warmer further south, meaning many marine species are also shifting south, altering their habitual movements and feeding habits.

“The data gives an in-depth picture of the behaviour of these animals over the ten years of the study enabling us to predict how behaviour might change in the future. For example, in the case of bull sharks – a species we tracked that is known to be potentially dangerous - research has shown that they move within warmer waters, meaning it is important that we understand how they modify their movements in response to changes in ocean conditions and processes,” explained Professor Rob Harcourt from Macquarie University, who is the Leader of the Animal Tracking Facility at IMOS.

The researchers say that the data is a powerful addition to their centralised national database, and hope that the results will also foster future investigations by other marine research groups.

“In this study we were able to validate our tracking data by developing an open-source, state of the art algorithm that identifies background noise signals and anomalous movements, thus strengthening considerably the quality and re-usability of our dataset. The data is available through the online Australian Ocean Data Network Portal, making it a very valuable resource for comparing the behaviour of marine animals today and in the future.  We are also going to add the data to public marine species location databases to improve existing biodiversity records and enhance existing geographical distribution maps for Australian sea species,” Professor Harcourt concluded.

The full paper:

Hoenner, Xavier; Huveneers, Charlie; Steckenreuter, Andre; Simpfendorfer, Colin; Tattersall, Katherine; Jaine, Fabrice; Atkins, Natalia; Babcock, Russ; Brodie, Stephanie; Burgess, Jonathan; Campbell, Hamish; Heupel, Michelle; Pasquer, Benedicte; Proctor, Roger; Taylor, Matthew D; Udyawer, Vinay; Harcourt, Robert. Australia’s continental-scale acoustic tracking database and its automated quality control process. Scientific Data. February 2018.

Categories:  news, Facility, Animal Tracking, Home Slider, AODN

Acoustic tags deployed on marine animals are detected when swimming within the detection range of receivers. Researchers offload receiver detections when servicing their equipment and subsequently upload those, along with tag, animal, and receiver metadata into the IMOS ATF web application, where these are available for download in non-quality-controlled format. A quality control procedure is applied on detections of public registered tags and the resulting data are made available through the AODN portal.

Example of species map produced as part of the technical validation showing the spatial distribution of detections for tags deployed on grey reef sharks.