  This work explores the relation between magnetic islands, long range temporal
correlations and heat transport. A low order rational surface ($\iota/2\pi =
3/2$) was purposely scanned outward through an Electron Cyclotron Resonance
Heated (ECRH) plasma in the TJ-II stellarator. Density turbulence and the
poloidal flow velocity (or radial electric field) were characterized using a
two channel Doppler Reflectometer. Simultaneously, the ECRH power was modulated
to characterize heat transport, using measurements from a 12 channel Electron
Cyclotron Emission diagnostic. A systematic variation of the poloidal velocity
was found to be associated with the stationary $\iota/2\pi = 3/2$ magnetic
island. Inside from the rational surface, the Hurst coefficient, quantifying
the nature of long-range correlations, was found to be significantly enhanced.
Simultaneously, heat transport was enhanced as well, establishing a clear link
between density fluctuations and anomalous heat transport. The variation of the
Hurst coefficient was consistent with a magnetohydrodynamic turbulence
simulation.
