Data from: Are exotic plants more abundant in the introduced versus native range?

Dean E. Pearson, Özkan Eren, Yvette K. Ortega, Diego Villarreal, Muhyettin Şentürk, Florencia M. Miguel, Miguel C. Weinzettel, Aníbal Prina & José L. Hierro
Many invasion hypotheses postulate that introducing species to novel environments allows some organisms to escape population controls within the native range to attain higher abundance in the introduced range. However, introductions may also allow inherently successful species access to new regions where they may flourish without increasing in abundance. To examine these hypotheses, we randomly surveyed semi-arid grasslands in the native and two introduced ranges (12,000-21,000 km2 per range) to quantify local abundance (mean cover...
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These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?