Repeating Islands

In his article “Parrots of the Caribbean: Extinction Looms in the Bahamas,” Zach Fitzner makes a enthralling case for trying to save the Cuban Amazon parrot (Amazona leucocephala bahamensis) from extinction. Here are excerpts:

Ecosystems have come and gone, the planet destroyed and rebuilt over and over. [. . .] I get to work in the morning and the reminders of the past don’t stop. Piles of fossil casts line shelves, sit on tables, and often clutter the floor. The walls are covered by old skulls and artifacts; dugout canoes hang from the ceiling, more reminders of a world long lost and of one we seem to be losing. On any given day I might work on creating a replica of a skeleton of an extinct tyrannosaur, an armored fish or a giant sloth.

So it’s natural for me to think of the possibility of modern extinction when I work with living animals. I recently spent three months working with the Cuban Amazon (Amazona leucocephala bahamensis) on Abaco Island in the Bahamas. The Cuban Amazon is an unassuming little parrot living in forests of Caribbean pine next to beaches sought out by generation after generation of happy honeymooners. [. . .] They’re small compared to a scarlet macaw, close to the size of a puffin or a really large pigeon. Seen on the white page of a field guide, the parrot is vibrant in color, so it’s surprising how well they blend into their environment. Their bodies are a bright green with bright blue feathers at the fringe of the wings that are usually only seen when they’re in flight. Their faces are white and their necks a bright scarlet. They have hooked beaks that can do a nasty number on your hands (I received one bite over the summer but nothing debilitating) and strong feet for grasping branches, pine cones, and the fingers of biologists banding them.

The parrots nest in limestone cavities, a very unusual home for a bird. Abaco is built of old coral reef systems. Through the magic of geological alchemy, the reefs have been turned into a limestone island riddled with caves and little pockets like the ones the parrots nest in. A quick look around the pine forest and the benefit of nesting in small holes in the ground, especially limestone holes, becomes obvious. Bits of ash cling to the pine trees that all exhibit obvious signs of fire; the Caribbean pine is a tree adapted to an ecosystem with lots of periodic fires. No place in the forest could be safer from fire than underground in a limestone parrot bunker. This is just one hypothesis to explain a limestone cavity nesting behavior, but it’s an explanation that makes good sense. [. . .]

Still, there is that thought of extinction I mentioned earlier, the thought that conjures images of those ghastly, spectral, giant skeletons I sometimes work with. If the parrot is so cautious, protecting its nest and sneaking home to remain undetected from predators, what could be the danger? People. Of course, people are the danger. This is a familiar story but the details are more complex than the same old parable told everywhere else. How endangered the Cuban Amazon is depends on its designation as one species instead of several. The PhD student I worked for in the Bahamas appealed to the American Ornithologists Union to have the status of the Bahamas parrot officially changed from that of a subspecies to its own species. If it became its own species, it would be obvious how endangered it is. Even as a single species—instead of several differing species—the population is not as strong as it once was. Numbers of the Cuban Amazon in Cuba are down and several islands where it once lived have no parrots at all now. A remnant population clings to Cuba and Isle of Pines, as well as Great Inagua and, of course, Abaco in the Bahamas. They once lived on all of the islands of the Bahamas but have been extirpated from all but the two. If the new species designation was made official, it would mean that the relatively small population on Abaco and Great Inagua would be all that is left of a species. The main threats to the parrots on Abaco are the pet trade and predation by house cats.

Banding parrot chicks is a lot of work. [. . .] The first nest that I helped band mysteriously lost all of its chicks. It’s very likely that those chicks were captured and sold in the pet trade. The nest they disappeared from is one we learned later had a reputation in the community. It was a large cavity, easy to reach into, with chicks ready to be sold for thousands of dollars in Miami. Every individual of a species doesn’t have to actually die for that species to become ecologically extinct. The species just has to be completely divorced from its ecosystem, completely removed from the wild.

The sad truth is that besides being sold into the pet trade, the Cuban Amazon has other very real threats. One of the major threats is the house cat. It has been estimated that house cat predation is the number one cause of death for song birds in North America. It’s no less true that in Abaco house cats are a big problem for parrots. This is where the Bahamas National Trust (a pseudo government agency similar to the National Park Service) comes in. Not only have they created a park system, they’ve created a predator control program. There’s a man in South Abaco whose job, among other things, is to hunt house cats. He leaves in the early morning, the back of his truck full of his hunting dogs of no distinct breed, radio collars strapped to their necks. He carries a shotgun in the cab with him; sometimes the cats get treed out of the dogs reach or he needs to take care of them himself for any number of other reasons. We also set up electric fences around nest cavities to test their effectiveness against cats. It’s a continuing battle, not one that is likely ever to end. People continue to buy cats; cats continue to breed; some of those cats will wander into the forest of South Abaco. Beyond that, there will be more growth, more tourists and more people wanting to retire to a subtropical paradise they will discover in Abaco. The pressures on the parrots will only increase, and to keep them extant, work will have to continue indefinitely. The question we have to ask, as we’ve had to worldwide with so many species, is: how much is the Cuban Amazon worth? With any luck, the work will continue and the parrot will have a bright future. This work, however, is always propping a species up, never bringing it lasting security. If the work stops for a short time, numerous threats could snuff out a unique lineage. The labor is Sisyphean; conservation is always working to maintain the status quo, fighting against a final, inevitable defeat. What we must ask is: when can a species go extinct and when should we fight to the end for it?

These are the things I wonder about as I cast those cumbersome skeletons of shovel nosed elephants and ankylosaurs. The truth is that most animals that have lived on this planet have gone extinct. The difference now is that we as humans have the power to cause, or to prevent (at least for a time) extinctions. May we learn to wield this power wisely for the sake of the parrots on Abaco and for life everywhere.

Photo (by Lhb1239): Cuban Amazon in the Grand Cayman islands, a different subspecies than the Bahamas’ Cuban Amazon.

For full commentary, see http://news.mongabay.com/2012/1008-fitzner-cuban-amazon.html