1. the establishment and naturalization of a non-native species in a new habitat or environment
Usage: technical term used in ecology and biology; often refers to successful colonization by introduced or invasive species

Examples

• The ecesis of rabbits in Australia had dramatic ecological consequences.
• Scientists study the ecesis of invasive plant species in native ecosystems.
• The rapid ecesis of the zebra mussel in North American waterways alarmed environmental officials.
• Ecesis requires that an introduced organism survive, reproduce, and spread in its new environment.
• The ecesis of feral cats on islands has threatened numerous bird populations.