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We examined the hypothesis that the loss of canopy-forming macroalgae from rock pools would have stronger effects on associated algal assemblages along gradients of harsher cli- mate conditions (i.e. higher sea and air temperatures and irradiation) occurring in continental Por- tugal and the Canary Islands. The study was carried out at ‘cool’ and ‘warm’ regions in both sys- tems (N and SW Portugal and Lanzarote and El Hierro Islands, respectively), using a comparative approach involving the same manipulative experiment simultaneously conducted at multiple locations. Canopy-forming macroalgae were experimentally removed, and the structure (abun- dance and distribution) of associated algal assemblages (in terms of morpho-functional groups) was compared between treated and unmanipulated plots 6 and 12 mo after removal of the canopy. In both continental Portugal and the Canary Islands, warmer conditions were associated with a larger Euclidian distance in the structure of assemblages between canopy-removed and unmanip- ulated plots 6 mo, but not 12 mo, after the removal treatment. Responses of morpho-functional algal groups varied depending on the system, in addition to the environmental gradient. Although the present findings could not be unequivocally ascribed to causal effects of climate conditions alone, they indicate that the effects of algal canopy loss were enhanced along gradients of harsher environmental conditions at even supposedly very different continental and island systems over the short term. The studied systems were potentially able to recover about 1 yr after the distur- bance, but this might not happen under current or predicted scenarios of natural or anthropogenic disturbances able to drive a persistent loss of foundation species

Effects of loss of algal canopies along temperature and irradiation gradients in continental Portugal and the Canary Islands