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New research finds surveys of larval-stage organisms effective for measuring marine biodiversity

There is a push to document the biodiversity of the world within 25 years. However, the magnitude of this challenge is not well known, especially when it comes to vast and often inaccessible marine environments. To date, surveys of species diversity in the world's oceans have focused on adult organisms, but new research from Boston University has found that studying marine life in its larval phase with DNA barcoding is a valuable way to estimate biodiversity.

Using this novel approach, Paul Barber, an assistant professor of biology at BU, discovered that biodiversity is greatly underestimated in the region of the Pacific known as the "Coral Triangle" and in the Red Sea. The study, which focused on coral reef-dwelling mantis shrimp (stomatopods), is the first to compare larval stage organisms to adults.

Through DNA barcoding ?a new method not commonly used in aquatic settings ?Dr. Barber and his colleague, Sarah Boyce of Harvard University, compared the DNA sequences of a random sampling of stomatopod larvae to a sequence database of most known mature species of mantis shrimp. The comparisons revealed numerous new varieties of shrimp that are completely unknown in their adult forms.

"Our results show that biodiversity in mantis shrimp in these regions is estimated to be at least 50 to 150 percent higher than presently believed," said Barber. "Given that few groups of marine organisms are as well studied as mantis shrimp, the biodiversity in other groups is likely even more poorly known. What's unique about this study is that we didn't just discover new species, we used DNA barcoding to quantify how much biodiversity is out there that we don't know about."

According to Barber, the results suggest that examining marine life in the larval stage offers a new and highly effective way to estimate biodiversity since most organisms have a developmental phase where minute larvae disperse on ocean currents.

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Source:Boston University


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