Biologies of betrayal: Judas goats and sacrificial mice on the margins of Mexico

摘要

Invasive species are the subject of much debate and attention. Social scientific analyses of alien species have focused on rhetoric about invaders, arguing that the discourse about invasive species reflects how people think about nature, culture and agency. In this article, I argue for a focus not only on discourse, but also on what happens in practice in the encounter between field scientists and invasive animals. Through ethnographic fieldwork on Guadalupe Island in Mexico, I analyze both the place of islands in the Mexican nation and invasive species eradication programs as examples of 'care of the pest', that is, projects in which scientists carefully tend to invasive organisms in order to produce knowledge about them. This knowledge is then used against the animals to exterminate them in a 'biology of betrayal', and occasionally, animals are enlisted into these projects to aid scientists in eradicating fellow members of their species. This article shows how changing perceptions of the value of island ecologies affected the use of the land and the fates of the animals on Guadalupe Island as the island was variously configured as laboratory, field site and slaughterhouse.