What specific mechanism was entirely responsible for the global dispersal of the Round Goby?
Answer
Ballast water.
The movement of the Round Goby from its ancient home to distant continents was dependent on international shipping, specifically through the discharge of ballast water taken on in the departure port.

Related Questions
Where is the native range of the Round Goby concentrated?What specific mechanism was entirely responsible for the global dispersal of the Round Goby?When was the Round Goby first detected in the North American Great Lakes system?What anatomical feature aids the Round Goby in attaching to substrates in turbulent lake environments?What ecological advantage does the Goby possess during cold periods compared to many native fish?What specific location was the initial discovery point of the Round Goby in the Great Lakes?The Goby's success in exploiting new niches includes scavenging on what specific organism's beds?What is the current primary focus for resource managers concerning the established Round Goby population?The diet of the Round Goby includes which life stages of native fish?Besides the Great Lakes, where else have established Round Goby populations been noted in connected or downstream systems?