13 Can We use a Landscape Approach to Assess Natural and Anthropogenic . . .
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Fig. 13.5 Temporal evolution of the macroalgal cover of the two faces of one single boulder, after
have been overturned. a–b: initial position of the boulder before over turned experimentally upside
down (a upper face September 2010; b lower face September 2010). c–e–g: the upper face which
became the lower face (c October 2010: upper face upside down since one month (the boulder
had been overturned just to the shot, then reversed); e February 2011; g April 2011). d–f–h the
lower face which became the upper face (d lower face upside down since one month October 2010;
f February 2011; h April 2011). (© M. Bernard, All rights reserved)