While researching my previous blog A Dry Rainforest? I learned that Costa Rica is having a more extreme dry season than most and is actually experiencing a drought. To the untrained eye (like mine and most tourists) the forest appears fine; the plants are green and the lack of rain is assumed to be due to the dry season. For those familiar with rainforests, however, the signs are everywhere. Plants have fewer new growths than usual, deciduous trees have lost many of their leaves, and there have been many days with no precipitation at all. The cloud forest in Monteverde, normally a place of constant precipitation even in dry seasons, has received no precipitation for the past five days.
The drought has consequences reaching far beyond the rainforest. Hydroelectric dams generate approximately 82% of Costa Rica’s energy. The dropping water levels caused by the drought result in less water pressure to power the dams, reducing their total hydroelectric power. Costa Ricans must compensate by shifting to fossil fuels, hindering their goal to become the world’s first carbon neutral nation by 2021. It is believed that this drought is the result of a severe El Niño – the same weather system bringing floods to southern California – but the effect is exacerbated by recent climate trends. Global climate change has affected the region by increasing the number of completely dry days during the dry season. Since 2011 the area began experiencing over 100 dry days a year. Ironically, Costa Rica’s forced use of more fossil fuels only exacerbates the issue. If they are to achieve carbon neutral status, Costa Ricans (and the entire global population) will need to find a way to avoid regressing towards using fossil fuels.
In class I learned to classify a rainforest as a forest that receives ample precipitation throughout the year. I was confused then to find out that the Carara National Forest, while still a vibrant green, is currently in its dry season. We learned that there are different formations, or classifications, of rainforests that depend on factors including climate, soil, and elevation. Carara, for example, is a seasonal forest because it experiences a wet and dry season.
The seasonal changes in Carara are not due to Earth’s axial tilt, like the seasons we are used to in temperate climates. Instead, the seasons are a result of wind patterns over the mountainous continental divide. During the summer strong trade winds drive clouds from the Caribbean side of Costa Rica over the continental divide to the Pacific side. On their journey up the mountains the clouds lose much of their precipitation and create a rain shadow effect in Pacific forests like Carara. In the winter, the trade winds die down and allow clouds from the Pacific side to rise up over the central mountains, thus beginning the wet season.
En route to Jaco from San Jose there is a bridge over the Rio Tarcoles made famous from the large population of American Crocodiles (Crocodylus acutus) that gather down below. The bridge has become a popular ecotourist stop, and after going there I see why. The bridge is just wide enough that people can exit their cars and walk alongside the road. We counted 26 enormous crocodiles in the water below us!
The reason for the large population is unclear, but their presence is evidence of the respect Costa Ricans hold for the environment. The crocodiles thrive because they are protected by the Costa Rican government. In 2012, a law was unanimously passed to ban all sport-hunting in Costa Rica. Not only was this the first law of its kind in the Americas, but it was also the first bill in Costa Rica to be proposed by popular initiative. Because of the widespread value Costa Ricans place on their environment, there is a large public movement to protect wildlife. The petition for the law submitted to Congress had 177,000 signatures.
My name is Tracey Funk and I am a freshman at KU studying Biology. I have always been interested in ecology and enjoy spending time outdoors. Participating in the Field Biology program in Costa Rica will give me an opportunity to develop my research skills and experience true fieldwork. I am especially looking forward to seeing a cloud forest firsthand and learning more about the dynamics in the unique ecosystem. My favorite aspect of ecology is exploring the relationships between different organisms. While in Costa Rica, I hope to compare and contrast the relationships in tropical ecosystems to those in the prairie ecosystems I am familiar with in Kansas.