Study identifies most vulnerable tropical reef fish

February 5, 2016, University of Adelaide

Scientists have identified the key drivers of why some species are absent from reefs in the Indian and Pacific oceans, and which species are most vulnerable. Incorporating this knowledge in to conservation strategies will help to reduce human impact on species loss.

Published in the journal Nature Communications, the findings are the result of an involving a large team of scientists including from the University of Adelaide. Together they produced one of the world's most extensive datasets of reef fishes. By analysing almost 10,000 records from more than 900 locations, the team was able to identify specific types of fishes that are most vulnerable to human impacts and .

"Our analysis of 241 fish species showed that larger-bodied fish, especially those with smaller geographic ranges are especially vulnerable," explains lead author Dr Camille Mellin, from the University of Adelaide's Environment Institute and the Australian Institute of Marine Science. "In fact, these species are 67% less likely to occur where and temperature seasonality exceed critical thresholds.

"So, for example, these types of fish actually occur less commonly on reefs in the Coral Triangle (between the Philippines, Indonesia and Papua New Guinea), which is surprising given that this is a well-known marine biodiversity hotspot.

"In the Coral Triangle, coral reefs tend to be highly affected by human activity, such as fishing and urban development, in contrast to the less-impacted reefs in New Caledonia or on the Great Barrier Reef that tend to host more of these large, small-ranging fish species."

Although these fish represent only 7% of all the species the team examined, they often provide unique and important functions on the reef.

"The greater sensitivity of these larger-bodied, small-ranging to human pressure could have serious consequences for reef ecosystems if they are lost," says project leader Dr Julian Caley from the Australian Institute of Marine Science.

These findings highlight the need to focus on these at-risk species, and pay particular attention to management of those factors that make them vulnerable.

Explore further: 'Twilight zone' fish swim silently with forked tails

More information: C. Mellin et al. Humans and seasonal climate variability threaten large-bodied coral reef fish with small ranges, Nature Communications (2016). DOI: 10.1038/ncomms10491

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