Antarctic Sea Slug Reveals Hidden Biodiversity

Marine scientists have discovered that the Antarctic nudibranch Doris kerguelenensis, previously thought to be a single species, actually comprises at least 75 distinct species. The research was led by Dr Paige Maroni and Dr Nerida Wilson from the University of Western Australia's School of Biological Sciences and Oceans Institute.

Key Findings

• Large-scale genomic analysis of 130 specimens identified at least 75 distinct species within what was once considered a single species.
• Earlier genetic work had suggested approximately 59 hidden species.
• The discovery was enabled by advanced genomic techniques and museum collection specimens.

Background

Doris kerguelenensis is a sea slug found in Antarctic waters. As adults, they crawl along the seafloor. The evolution of the species complex is linked to Antarctic glacial cycles over millions of years.

Expert Statements

"Antarctica is often perceived as biologically sparse, but discoveries like this reveal it contains extraordinary hidden diversity."

"Advanced genomic techniques show that what appeared to be a single species is actually a complex system of many distinct evolutionary lineages."

— Dr. Nerida Wilson

"Over millions of years, Antarctic marine life has repeatedly been fragmented, displaced and reconnected as massive ice sheets advanced and retreated across the continental shelf. These glacial cycles appear to have acted like an evolutionary engine driving the formation of entirely new species. "

— Dr. Paige Maroni

Implications

The study provides a framework for understanding how climate-driven environmental change shapes biodiversity over evolutionary timescales. It may help predict how marine ecosystems respond to rapid climate change.