Any interaction that is mutually detrimental or harmful to both participants, occurring between species that share limited resources, such as food or space. A competitor is a species that may compete with another species for resources
US Department of Commerce, National Oceanic and Atmospheric Administration, Glossary - NOAA's State of the Coast (SOTC), Washington, DC, USA 2013. http://stateofthecoast.noaa.gov/glossary.html, (CoaStormEmr - Amer) {881}