A One-Colored Big “Small” Cat
Where have all the coatis gone?
By Jack Ewing
Gatun Lake was created when the Panama Canal was built. Before the area was flooded there was nothing but primary rainforest. Once the lake was full only the top of a mountain remained above water. Today that 15.6 square kilometers of forest covered mountain top is known as Barro Colorado Island, and it is one of the most intensively studied rainforests in the world. At some point scientists noticed that bird populations on the island were diminishing, and they endeavored to find out why. As it turned out, the root of the problem had to do with big cats. When the lake was flooded a few pumas and jaguars ended up on Barro Colorado. Since the island was too small to support even one large cat for any length of time they all eventually swam to shore. That’s when the birds started diminishing. Without pumas and jaguars to prey on the coatis and raccoons their populations increased rapidly. Both of these mammal species are omnivorous, both are semi arboreal, both are opportunistic predators, and they wreaked havoc on the nesting birds. As often happens when Mother Nature is allowed a free rein, the problem eventually solved itself. From time to time a large cat will swim to the island, stay and hunt until the prey base is thinned considerably, and swim back to the mainland. This keeps populations coatis and raccoons more or less under control.
The Quepos Bridge Club plays at 12 noon every Tuesday at Dos Locos Restaurant.















