  The characteristics of ion temperature gradient (ITG) turbulence in the
presence of a magnetic island are numerically investigated using a gyrokinetic
model. We observe that in the absence of the usual ITG drive gradient, a
solitary magnetic island alone can drive ITG instability. The magnetic island
not only drives high-n modes of ITG instability but also induces low-n modes of
vortex flow. Moreover, as the magnetic island width increases, the width of the
vortex flow also increases. This implies that wider islands may more easily
induce vortex flows. The study further indicates that the saturated amplitude
and transport level of MI-induced ITG turbulence vary with different magnetic
island widths. In general, larger magnetic islands enhance both particle and
heat transport. When the magnetic island is of the order of 21 times the ion
gyroradius (21\{rho}_i), the turbulence-driven transport level can reach the
same level in cases where ITG is driven by pressure gradients.
