Survival 



In September, 4 months after our initial planting, the survival of 

 plugs was significantly greater than that of sprigs for all three 

 species (Table 3). Survival averaged over transplant type was about 

 65% for both Puccinellia and Spartina but only about 50% for Juncus. 

 Reevaluation of these May 1979 transplants 1 year after planting 

 indicated that significant mortality of both transplant types occurred 

 over winter (Table 3). Greater overwinter mortality occurred in plug 

 than in sprig transplants for both Puccinellia and Juncus . These 

 results suggest that whatever factors were causing mortality in the 

 sprigs were still affecting the plugs and that it was simply taking 

 longer to cause mortality in the larger transplant type. Overall 

 survival was less than 50% for both transplant types for all species, 

 but still significantly higher for plugs than for sprigs. These 

 relatively low survival percentages included plantings in unfavorable 

 (low elevation, exposed, poorly drained) locations, since we were 

 trying to determine response over a wide range of conditions. In the 

 more favorable sites, at about the elevation of the natural Juncus 

 marsh, survival of plug transplants was consistently above 70% for 

 Puccinellia . On those planting sites where 10% or more of the 

 transplants survived through the second year, plugs continued to 

 survive better than sprigs for Puccinellia and Juncus (Table 4). Of 

 all the 1979 transplants, only those of Puccinellia on the better sites 

 yielded survival values of greater than 60%. 



TABLE 3. Percent survival at 4 and 12 months for two types of 

 transplants 3 for three species for the combined plantings 

 made at lie Grande and Kerlavos in May 1979. 



Survival (%) by time" by type 



Species 4 months 12 months 



Sprig Plug Sprig Plug 



a There were 230, 979, and 100 transplants of each type for Juncus , 

 Puccinellia and Spartina , respectively. 



b Survival of plugs was significantly greater than that of sprigs 

 within and over all three species at each of the two sampling periods 

 based on chi-square analysis. The reduced survival of both transplant 

 types over species between the two sampling periods was also 

 significant based on chi-square. 



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