21 years later, the other stream frog shoe drops

Thursday, July 12, 2012
Rafe Brown


Today was a cathartic day in my own personal journey in studies of Philippine biodiversity. The story starts in 1991 when, as an undergraduate student at Miami University, I joined my first biodiversity inventory expedition to the Philippines. This was a great experience for a 22 year old, and my life took an immediate and irreversible turn (for the better) towards my passion for the study of life in islands archipelagos. But more to the point: in 1991 we surveyed the southern slopes of Mt. Busa in South Cotobato Province (southern Mindanao). The southern Philippines was a bit wild back then and a major commercial logging operation was focused on logging out the remaining huge, closed-canopy, forests along the south coast of Mindanao. Valued at $10,000 per trunk on the Japanese timber market, the hardwood logs that came down the slopes of Mt. Busa made two Kiamba area families extremely wealthy…and changed the landscape and biodiversity of the immediate area forever.

In 1991 I took this image of a WWII MacArthur era weapons carrier truck, converted to a logging skidder, carrying out the massive trunks of the last giant trees from the lowland forests of southern Mindanao. The environmental devastation imparted by this kind of logging is clearly evident; in this picture a logging truck drives through a small stream in a denuded area where a few days before I had collected frog specimens in what had then been pristine forest.

On that trip, justifiably convinced that all local frog populations were going locally extinct, we mounted a salvage operation and collected specimens to the very legal limit allowable by our permits. We anticipated that no animals would survive the holocaust of large-scale commercial logging in that drainage on Mt. Busa and we did the best we could to document every resident species’ presence in the form of preserved specimens, before the record of their existence had been erased forever.

In the middle of a large series of preserved frogs, I unknowingly preserved a single specimen of what I have, over many years, come to believe is new species, still unnamed and unknown to the world. At the time, the slight morphological differences did not impress me and I misidentified the specimen as one of the locally common species. Years later, during my Masters work at Miami University, I showed that this one individual was genetically distinct…but I hesitated to name it because I had only that one specimen…

Now, 21 years later—last night—I finally collected another specimen and knew in an instant what it was…as I flash backed to my memories of Mt. Busa in 1991. How could I have ever doubted myself? This frog obviously is a new species of great conservation significance.

After decades of biodiversity work, so many species discoveries, years of contributions to conservation efforts and student training, I reflect back on so many arguments with my fellow “conversation” biologists on the topic of faunal collecting and the age-old tradition (standardized by Linnaeu) of preserving specimens for describing and documenting biodiversity. Some individuals, understandably abhorring the killing of animals for any reason, frequently speak ill of the practice of collecting and preserving specimens for science. They argue that it is no longer necessary, that it is unethical, or that scientists may actually contribute to extinction of a species by removing a few individuals from the gene pool. Given the unceasing pace of habitat destruction brought about by logging, mining, and gradual conversion of forest to agriculture, there is absolutely no doubt in anyone’s mind that the real threat to biodiversity is habitat loss, not occasional specimen preservation by scientists. We can debate about all the possible causes, but at the end of the day the fact remains: when we cut down the forest, the organisms that depend on it will go extinct. If we cut down all the forest in an area in rapid succession, there is little to no chance for survivors.

For my part, I’m reminded of how important it is to document biodiversity assessments with vouchered specimens. I’m relieved that I unknowingly collected and preserved that large series of frogs in 1991, before their population’s extinction at the hands of the loggers. We now know that there once was a population in the previously forested area, which has now been converted to scorched, arid, grassland. And in the process we discovered a new, unknown species, albeit by mistake. It has taken me 21 years to convince myself of its distinctiveness, but today I am vindicated. And another population (in a protected area) has now been identified, with positive prospects for the continued survival of the species. Finally, the Philippines now has 110 + 1 species of amphibians.