Restoration techniques for Macrocystis pyrifera (Phaeophyceae) populationsat the southern limit of their distribution in Mexico

Following the 1982-83 Fl Nino, Macrocystis pyrifera (L.) C. Agardh, forests disappeared throughout their range in Baja California. The giant kelp fore sts subsequently recovered within this range except at their extreme southe rn limit, a region encompassing 50 km of coastline with a former giant kelp standing stock of 28,000 wet tons. Two techniques were tested to restore t hese forests: juvenile transplantation and seeding with sporophylls. For tr ansplanting, juvenile M. pyrifera sporophytes were attached to Eisenia arbo rea stumps seasonally over a two-year period. Average survival of transplan ts ranged from 7% in spring to 41% in winter. After two years, the average number of basal fronds per plant increased from 2 to 64 per plant and surfa ce fronds from 0 to 34 per plant. Average frond growth rate of the transpla nts ranged from 8.1 cm day(-1) in summer to 10.8 cm day(-1) in winter. No s ignificant differences in growth rate were found among treatments (seasons) for the transplants, but control plants showed a seasonal variation, with higher frond growth rates in winter (13.3 cm day(-1)) and spring (9.3 cm da y(-1)) and lower in summer (4.4 cm day(-1)). The seeding technique was test ed in a fully orthogonal-block design with three factors with two levels (f actors: + sporophylls addition, +/- Eisenia arborea and +/- understory alga e). Macrocystis pyrifera recruitment occurred only in treatments with added sporophylls. The highest recruitment occurred where all algae were removed from the bottom, followed by the treatments without understory algae but w ith Eisenia arborea. This results suggest that a lack of spores and the pre sence of understory algae were the main factors inhibiting Macrocystis pyri fera recruitment in the area. Lower sea water temperatures and high nutrien t concentrations occurred in spring and high temperatures and low nutrients in summer suggesting, as in southern California, an inverse relationship b etween these two factors. The results suggest a combined approach of transp lanting juveniles and seeding during spring would be most effective for res toring the M. pyrifera forests.