I have a true passion for amphibians, those creatures with moist skin and sticky toes that many people fear or dislike. They are jumpy and at times hard to find, yet that’s nothing more than a challenging proposition to a frog fan like me. This time the trip took me for the second time in less than 6 months to the Bocas del Toro district in Panama. There’s something magical happening in this area composed of the mainland and few surrounding islands to the point that scientist called them the Galapagos of the Caribbean. By now you should know the importance of the Galapagos Islands and if you don’t here’s a tip. The Galapagos are a living evolution laboratory, where we can observe the effects of adaptive radiation, a process in which organisms diversify rapidly from an ancestral species into a multitude of new forms. In the case of Bocas del Toro, a tiny frog has evolved many different phenotypes – a description of observable physical, physiological or behavioral characteristics that separate a group of individuals from the rest of the species. Different from genotypes which are the actual genetic identity, phenotypes are affected by both the genotype and the unique environmental conditions surrounding the individual. My subject is a tiny frog — Oophaga Pumulio — aka the Strawberry Poison Dart Frog. In it’s most common form it looks like the one below.
The challenging part was finding these tiny frogs no more than one inch in length while dodging the weather. For starters, these guys don’t like bad weather. In order to find them I needed to hear them first. Too much rain and they go mute, making them nearly impossible to find on the leaf litter of the forest floor. Even when the conditions were optimal, they will choose impossible places from where to call, making them inaccessible or difficult to photograph. Walking through muddied trails, slipping down the hill sides or landing on large puddles of water made the adventure more exciting at times. Once found then I had to battle the elements and the gear. Constant drizzle and high humidity sabotaged the gear more than once. The copious sweat getting in the eyes and all over the cameras added to the miserable ground conditions. To visit some of the sites where these frogs can be found we had to take boats. One of the interesting things about these frogs is the fact that several phenotypes can be found in one same island. In the case of Isla Bastimentos there are at least three different forms of the frog. Isla Colon also have their share. Every island in the Bocas del Toro archipelago offers at least two phenotypes. But the mainland offer a unique set of conditions that produced even more phenotypes. Geographical isolation by either rivers or mountains provided enough separation for the establishment of various morphs, occasionally only separated by a river and in places where two distinct population exist, you can even find some individuals sharing characteristics of both populations. Insane to think that such a small area produced so much color evolution, but considering these frogs have a tiny range and small number of offspring.