Advection: supply/loss to GB Background
	• Fronts have implications for the relative importance of local vs. exchange processes, and the environmental conditions experienced by the plankton on GB •  Animals on the crest are generally retained on GB (Gentleman, 2000), and experience high food and predation levels • Animals on the lower-food SF are generally advected off GB in winter-spring, but may be advected northward, and possibly even back to the NEP in late spring