Biologists call it a “Mcdonald’s ecosystem”
I was at the book store one lunch break, trying to find Shadow Divers or The Last Dive or Diver Down because the thumbs up here perked my interest but that branch didn't have any of these on their shelves. I instead ended up with Out of Eden (An Odyssey of Ecological Invasion) by Alan Burdick.
Starts with plane-hitching brown tree snakes that have been eating Guam’s birds and practically “anything that smells of blood.” Ends with -- yes, there is a marine equivalent (in dispersal rate and rapaciousness) -- the European Green Crab.
Around one-third of the book dwells on marine bioinvasion and ballast ecology. Burdick says the appearance and content of entire marine ecosystems may be historically suspect. What we think is natural is really introduced over a century of maritime trade. He describes ballast water as moving aquariums infesting local waters with exotic marine pests. Sometimes the result is simply addition/absorption (new niches open up) but sometimes its disastrous subtraction -- like in the green crab’s case (not only depressing local populations, even single-handedly collapsing one city’s soft-shell industry).
Reads like a field report, fascinating in ts musing and detail. For example: If a marine biocontrol agent for the green crab would ever be attempted, a biologist proposes employing a parasitic barnacle (known to infect it in its home range). Apparently, as a gelatinous blob at the start of its life cycle, it finds a crab and, like a syringe, injects its parasitic innards. It then extends its roots throughout the crab’s body, weakening it but keeping it alive enough to go about its business -- including trying to reproduce except that instead of larval cabs, its brood is larval barnacles. “Sacculina carcini could be Alien for alien crabs, their Night of the Living Dead...Imagining itself as an organism in control of its fate and the trajectory of its offspring, in fact it is gradually fashioning a future in which it is merely a vessel for another form of life...” Good stuff :)