December 06, 2010
Everyone knows the tiger, the panda, the blue whale, but what about the other five to thirty million species estimated to inhabit our Earth? Many of these marvelous, stunning, and rare species have received little attention from the media, conservation groups, and the public. This series is an attempt to give these 'forgotten species' some well-deserved attention.
Here's why: cycads are ancient plants unrelated to anything on Earth. They are in a way living fossils of a bygone world, not unlike crocodiles. According to the fossil record, the cycads heyday was during the time of the dinosaurs, and, according to Dr. Thomas Marler, an expert on the plants of Guam, these great trees with massive sex organs (i.e. cones) look exactly like what one expects from an era when great beasts roamed antediluvian forests.
The unmistakable male cone of the Cycas micronesica. Photo courtesy of Thomas Marler.
Marler first became captivated by the cycad when as a child he observed the Cycas micronesica, one of some 300 known species of cycad, on the island of Guam. In particular the species' massive cones left him in awe.
"I was so impressed as a young child that something that massive and beautiful could develop so rapidly on a tree. The mature male cone, which can reach heights greater than 50 centimeters, emerges from the stem tip and develops into its full geometric grandeur in less than 2 months," Marler says.
Cycas micronesica is a cycad surviving in the western Pacific Ocean, including the island of Guam. As if being a cycad wasn't enough, Cycas micronesica is unique for a number of reasons: the Cycas micronesica lacks the protective armor produced on leaves of other cycads and the species is the only cycad known to be pollinated by a moth. In addition, the Cycas micronesica is also at the center of a mysterious neurological disease that has inflicted human residents of Guam. While the origin of the disease is unknown, researchers have hypothesized that toxins in Cycas micronesica could be to blame.
"Consumption of flour made from the seeds of Cycas micronesica trees is one viable candidate as the source of this environmental toxin," says Marler. But "continuing loss of trees is acutely compromising the ongoing research on these human neurological diseases."
A healthy Cycas micronesica. Photo courtesy of Thomas Marler.
"The speed with which Cycas micronesica plummeted from the most abundant tree species on Guam in 2002 forestry surveys to IUCN endangered status in 2006 is perhaps unrivaled," Marler says, who adds that 90% of the trees have vanished in the last seven years.
What caused this precipitous decline? Two words: invasive species.
"In 2003 the armored scale Aulacaspis yasumatsui [a parasitic insect of plants] invaded Guam. I predicated this invasion in writing in 2000, shortly after the scale invaded Hawaii. I also tried to secure a ban on ornamental cycad imports as a means of keeping the scale out of Guam’s Cycas micronesica habitat. We don’t really know how the scale invaded Guam, but within a year of its invasion it had already become established […] Mortality of all Cycas micronesica seedlings and small juvenile trees was rapid, and mortality of large trees has been sustained for 4-5 years as of the end of 2010. This devastating insect has immigrated to Rota and some Palau islands, and is now threatening the Cycas plants in these islands," says Marler.
As if this wasn't enough another invasive species, a butterfly which deposits it's young on cycads to feed off of them, landed in Guam in 2005 causing what Marler says is a "double-whammy to any [Cycas micronesica] population ".
Now, once non-lethal damage to the species—such as from feral pigs, deer, and local insects—are finishing off plants one-by-one. So, what can be done? Or is the Cycas micronesica doomed to go the way of its long-lost neighbors, the dinosaurs?
Marler suggests that infected islands fight invasive species with invasive species: researchers are looking at bringing in a natural predator of the scale insect—a "small, parasitic wasp" to keep the other invasive in check.
In addition the population of Cycas micronesica that is still free of invasive species must be protected from them.
Infested seeds on a female Cycas micronesica. Photo courtesy of Thomas Marler.
Still, it's not easy to rally the public around saving plants. Even though they provide us with much of our food, shelter, and medicine, they are often seen as an element of the background, rather than something immediate and important.
"As normally sessile [i.e. immobile] organisms, the recognized ability for humans to interact with plants pales in comparison to cute, fuzzy, highly mobile animals. While plants do respond to human stimulus, those responses are largely unimpressive and unnoticed by the general public," Marler says.
But the more we realize how incredible all species are—from scales to polar bears to cycads—the better chance we have of saving the world's varied and important life forms.
The healthy female reproductive structure of a Cycas micronesica, known as a "megastrobilus". Photo courtesy of Thomas Marler.
Infested male cone. Photo courtesy of Thomas Marler.
To discover more of the world's forgotten species: Click Here.
Mass extinction fears widen: 22 percent of world's plants endangered
(09/28/2010) Scientific warnings that the world is in the midst of a mass extinction were bolstered today by the release of a new study that shows just over a fifth of the world's known plants are threatened with extinction—levels comparable to the Earth's mammals and greater than birds. Conducted by the Royal Botanic Gardens, Kew; the Natural History Museum, London; and the International Union for the Conservation of Nature (IUCN), the study is the first time researchers have outlined the full threat level to the world's plant species. In order to estimate overall threat levels, researchers created a Sampled Red List Index for Plants, analyzing 7,000 representative species, including both common and rare plants.
Losing nature's medicine cabinet
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Giant exploding palm tree discovered in Madagascar
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