ident - line identifier
Year - Year published
First - Is the lead paragraph based on ecological theory (Theory) or boilerplate (Bioler)
Control - Is the study Exerimental or Observational?
Invasive - What organism type was the invasive species?
Native - What organism type was the native species?
System - What type of study system was used (Terrestrial or Aquatic?)
Better_competitor - Was the invasive or native species better competitor? Or was there no.effect or mixed effects?
Study_type - Was the study based in the field or lab or mixed?
Habitat - Did the habitat appear relatively Natural or Anthropogenically disturbed?
Journal - The journal in which the study appeared.