James Patterson books are an invasive species humans brought into library shelf environments because we wanted fast-reproducing, easily-digestible food. But at the time, we didn't know as much about their natural airport environment, which has very few available nutrients. This environment greatly favours the genericalist species like Patterson, so there's very little bibliodiversity compared to the more specialized library or bookstore environment. This means that each species in an airport has an enormously expanded niche compared to just about anywhere else books can thrive - in their natural habitat, Patterson books may be one of only 3 or 4 species competing for available nutrients. In these low-density, low-nutrient environments, Patterson books occupy vast swathes of territory without bothering other species. This history makes it extremely easy for them to outcompete the more specialized inhabitants of the library shelf, who have often been carefully selected to fill ultraspecific subgenre niches.
Left unweeded, Patterson books will expand their territory over multiple book bays, crowding out or even straight-up eliminating space for competitors and sending contributor-author runners out to other shelves. Contained to a single, planned set of shelves and kept strictly pruned, Patterson books can contribute to a healthy ecosystem. But many curators don't know or don't care to do the planning and maintenance, leading to the nightmare of overcrowding and loss of circulation.
