![]() (See "Alien-Wasp Swarms Devouring Birds, Bugs in Hawaii.") "The peat moss has had explosive growth where it was introduced, especially on Oahu," Karlin said. In the past century, people have used the moss for packing material, in doing so moving the species across Big Island as well as on the island of Oahu. But people have also lent a helping-though unwitting-hand in the moss's spread. Sexual reproduction-which creates airborne spores-would be required for the plant to move elsewhere. "So given a sufficient period of time, you will find that offspring from a clone may be genetically different from one another." "However, there are probably other plant populations on islands having a similar history that we haven't studied yet." Alien Moss a "Problem" for Local Plants Given the absence of sex, the moss has been likely "trapped" on the Kohala summit, Karlin said. "They're not identical because mutations are always occurring," Karlin said. The genetic analysis also revealed surprising diversity-challenging the popular assumption that clones are genetically drab because they can't swap DNA through sex. Using this mutation rate, they estimated how long it took for the different moss populations to get to where they are genetically-about 50,000 years. To find out, the team analyzed the genetic diversity of the current population of moss on the island and determined a mutation rate. (See your Hawaii pictures.) From these remains, Karlin and colleagues inferred that the moss had been in Hawaii at least that long, and perhaps longer. palustre moss remains have been found in 23,900-year-old peat near the summit of Kohala Mountain on Big Island (Hawaii). Ancient Moss Surprisingly Diverse Fossilized S. However, it is unlikely that there were many founding plants with each one having the same rare trait," he said. "You would expect one founding plant to have this rare trait. palustre is unisexual, having male and female plants, sexual reproduction would not have been possible, said study co-author Eric Karlin, a plant ecologist at Ramapo College in New Jersey. (See "Group to Clone California Redwoods.") All the moss populations sampled share a rare genetic marker, which suggests they're descended from a single founder plant that was carried via wind to Hawaii tens of thousands of years ago. The peat moss Sphagnum palustre is found throughout the Northern Hemisphere, but the moss living in Hawaii appears to reproduce only through cloning, without the need for sex or production of spores. ![]() Ker Than for National Geographic News Published DecemA moss spreading throughout the Hawaiian Islands (map) appears to be an ancient clone that has copied itself for some 50,000 years-and may be one of the oldest multicellular organisms on Earth, a new study suggests. 1 Moss & Fern Sphagnum palustre Hapu’u Tree Fern
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