5.0 out of 5 stars
Fighting the good fight, Sep 18 2011
This review is from: Rat Island (Hardcover)
This is a fascinating book about the dramatic effect of invasive species on native fauna. In particular, it focuses primarily on the effects of rats on island populations of birds. When birds evolve in habitats without rats or other mammalian ground carnivores, they become extremely susceptible to rats. Surprisingly (to me), rats are quite vicious and efficient predators. I thought that was a capacity they had, but were primarily scavengers. Not on new islands they aren't!
The book details the efforts of conservationists who grasp this truth and try to find a way of protecting endangered birds from invading hordes of rats. Ultimately, they realize that there is only one promising solution. Kill the rats/invaders. And in the last few decades, this has become possible. Islands in New Zealand and Alaska are featured in this book as conservationists turn into cold-blooded killers. That is part of the controversy, as are the inadvertent deaths of other species that feed on the poison rats. However, both forms of death are temporary. Bald eagles aren't being driven to extinction by eating a few dead rats on a few islands for one summer. And the idea that common rats are in danger of extinction is just silly. Unfortunately, it isn't silly or unrealistic to suggest that their prey (i.e., island ground-nesting birds) are in such danger. It's not a perfect solution, but the alternative to killing lots of rats and a few "bystanders" is the loss of many species.
This doesn't appear to be a new phenomenon. Supposedly, the humans who colonized the Pacific islands brought rats with them as good luck and an adaptable source of meat. That worked too well in too many cases. Indeed, the book (citing a research paper on the topic) suggests that the collapse of Easter Island's ecology may have been due to introduced rats eating all the seeds of the dominant tree species.
So this is a book about contradictions. Killing animals to save animals. Sadly, life is shades of grey, not black and white, so this has become necessary in some cases. I've read other books about invasive species where they suggest that invasives are most problematic when the environment has changed so that the native species is no longer as well-suited to it as they were. That opens the door for the invader, who can then outcompete the native in the new, compromised environment. This book clearly doesn't support that for many cases of rats invading islands. They are predators attacking prey who have not evolved any kind of a defense mechanism, and who are unable to respond quickly enough. So while the idea of shooting, trapping, and poisoning some rats, cats, and ferrets may seem offensive to some (it does to me), the alternative, permanently losing dozens of species, seems far worse. Overall, the book is well written and easy to read. This isn't a completely happy book, but it does offer the inspiring and much-needed message that humans can, if they are willing to really try, make the planet a better home for more species. And that's a message I can really buy into.
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