In arid SE Spain,Miranda et al. (2009a) also found high resistance in the response
of annual plant communities to reductions in water supply thanks
to the presence of species adapted to high climate variability.
Plant spatial distribution also affects water use efficiency and
productivity in this area, being higher when Stipa tenacissima L.
tussocks are perpendicularly distributed to the maximum slope
(Puigdefábregas et al., 1999).