The behavior of ships governs the degree to which they accidentally transport invasive species around the globe. Because more than 90% of all goods moved internationally are carried on ships, global trade strongly influences marine invasive species introduction patterns. Shifts in voyage route are generally driven by changes in market pressures but can also be caused by changing inter-ocean corridors (e.g., expansion of Suez and Panama Canals, growing trans-Arctic shipping.) The NBIC tracks the number and type of ship arrivals to US ports or places. When combined with other ballast water reporting form information, such as levels of ballast water discharge, time of year, last port of call, and other factors, invasion opportunity and risk can be assessed. Additionally, invasive species can also be moved on the submerged undersides of ships as hull fouling, so amassing and analyzing shipping routes and arrivals is important for understanding this separate mode of ship-mediated invasion.
Below are some useful ways to analyze patterns of vessel arrivals throughout the waters of the United States based on Ballast Water Management Reports (BWM reports) submitted to the NBIC. You can interrogate the data by type of arrival (coastwise arrivals, overseas arrivals or the combined total) or by ship type over time, as well as by spatial level of interest: National, Coastal, or State level.
Note: All data available in graphs and tables extend through the last complete month and are refreshed monthly. Because ballast water management reports may be amended, corrected or changed during quality control processes, particularly within the 20 days from arrival date for the last complete month, this may result in updates that will register when the data are next refreshed. All data are subject to change and use of any of the NBIC data implies agreement with the NBIC Data Use Agreement policy. Cite our data.