Polynesian Island yields ‘treasure trove’ of fungal biodiversity —


The islands of the South Pacific are a scorching spot for biodiversity, however their jagged peaks, scorching and humid circumstances, and distant areas have restricted scientists’ means to doc the various incredible types of life within the area.

In a brand new research revealed this week within the Journal of Biogeography, researchers from the College of California, Berkeley, present the primary detailed description of the gorgeous array of fungi that make their house on the Polynesian island of Mo’orea. The gathering contains greater than 200 species of macrofungi — that’s, fungi producing seen, fruiting our bodies — lots of which can be new to science.

“It is like a treasure trove,” mentioned research lead writer Matteo Garbelotto, cooperative extension specialist and adjunct professor of environmental science, coverage and administration at UC Berkeley. “It is actually uncharted territory in evolutionary biology and biodiversity of the fungal kingdom, and that is one the primary makes an attempt to generate baseline info on fungal range, not only for Mo’orea, however for your entire and huge Insular Oceania area.”

As a part of the Mo’orea Biocode Venture, the research staff spent months trekking throughout the island in the hunt for new species of fungi, in the end gathering a complete of 553 fungal specimens and sequencing the DNA of 433 of them. As a result of solely a handful of the sequenced specimens have precise genetic matches with different identified species, the Mo’orea collections are more likely to comprise utterly new species.

By evaluating the DNA sequences of those fungi to these of different species world wide, the staff was additionally in a position to piece collectively the place the fungal biodiversity on the distant island might have originated. The findings counsel that almost all of the species, or their ancestors, have been carried by easterly winds from Australia or different South Pacific islands, although a small quantity might have been delivered to Mo’orea by people from far-flung areas like East Asia, Europe and South America.

“We have been actually within the biodiversity of the island,” mentioned research first writer Todd Osmundson, who accomplished the work as a postdoctoral researcher at UC Berkeley. “Mo’orea is an island in the course of the ocean, and it is a geologically younger volcanic island. It is by no means touched one other piece of land. How did fungi get there, and the place did they arrive from?”

Understanding each the biodiversity of fungi on the island and the way completely different species have traveled world wide to reach at this distant location may help as scientists grapple with the continued impacts of worldwide journey and commerce on biodiversity.

“The Mo’orea BioCode undertaking was the primary all-taxa-survey of a tropical island to incorporate DNA vouchers and different related info. It included all organisms from marine and terrestrial habitats and every thing bigger than micro organism,” mentioned George Roderick, William Muriece Hoskins Professor of environmental science, coverage and administration at UC Berkeley. “Since, the information has confirmed to be enormously beneficial in monitoring the impacts of worldwide change on Mo’orea but in addition on different tropical Pacific Islands.”

‘On daily basis we had a unique problem’

The Mo’orea Biocode Venture was led by Neil Davies, government director of UC Berkeley’s Gump South Pacific Analysis Station, and ran from 2007 to 2010. One of many motivations for the undertaking was to create a mannequin ecosystem that might be used to reply elementary questions on how ecosystems work.

“Fungi are actually vital components of ecosystems,” mentioned Osmundson, who’s presently a professor of biology on the College of Wisconsin-La Crosse. “They act as major decomposers, and in some circumstances (as) pathogens that break down decaying natural matter and recycle the vitamins into kinds that different organisms can use. They’re additionally actually vital as symbionts. They stay with different organisms and profit that organism in alternate for different issues. As an example, some fungi will connect to the roots of crops and alternate vitamins with them.”

To gather the specimens, the analysis staff spent months on Mo’orea, starting earlier than daybreak every day to collect samples of fungi from all corners of the ecosystem, together with the soil, the roots and leaves of crops, and even the air.

As the warmth and humidity rose all through the day, the out of doors circumstances would usually grow to be inhospitable to each the scientists and the fragile fruiting our bodies of the fungi that they had collected. By early afternoon, they’d take their samples again to the lab and start the method of documenting and culturing the specimens that they had discovered, usually staying up late into the night time to finish their work.

“The terrain on the island is extremely steep, and when it rains it turns into extremely muddy, and a variety of areas will not be managed. So, day by day we had a unique problem,” Garbelotto mentioned. “There are some slopes you can solely actually discover on ropes. I keep in mind being hooked up to a rope with my arms protruding on the precipice, attempting to gather a mushroom that was rising on slightly outcrop the place you could not presumably stroll.

Every of the specimens was photographed and dried for storage within the College Herbarium and in comparison with databases of identified species. As a part of the biocode undertaking, the analysis staff additionally obtained DNA sequences of a particular gene that can be utilized as a singular “barcode” to distinguish one species from one other.

“In some ways, Mo’orea shouldn’t be a pristine island, and that really makes it extra attention-grabbing to me,” Garbelotto mentioned. “The island has utterly pristine areas and likewise has areas which were inhabited and deeply modified by people, beginning with the arrival of Polynesians 3,000 years in the past and persevering with till comparatively just lately with the arrival of the French, the English and the People. In comparison with locations which can be utterly pristine, Mo’orea is extra attention-grabbing to me as a result of it is extra consultant of what the world really is.”

Extra co-authors of the paper are Sarah E. Bergemann of Center Tennessee State College and Rikke Rasmussen, who labored on DNA sequencing as a volunteer at UC Berkeley. The Moorea Biocode Venture was supported by the Gordon and Betty Moore Basis.