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We construct far-from-onset radially symmetric spot and gap solutions in atwo-component dryland ecosystem model of vegetation pattern formation on flatterrain, using spatial dynamics and geometric singular perturbation theory. Wedraw connections between the geometry of the spot and gap solutions with thatof traveling and stationary front solutions in the same model. In particular,we demonstrate the instability of spots of large radius by deriving anasymptotic relationship between a critical eigenvalue associated with the spotand a coefficient which encodes the sideband instability of a nearby stationaryfront. Furthermore, we demonstrate that spots are unstable to a range ofperturbations of intermediate wavelength in the angular direction, provided thespot radius is not too small. Our results are accompanied by numericalsimulations and spectral computations.

Large amplitude radially symmetric spots and gaps in a dryland ecosystem model