科研之友
微信
新浪微博
Facebook
分享链接
摘要
seedlings of ipomoea pes-caprae occurred on nine of the beaches studied (n = 10) at santa catarina island, (state of santa catarina) and in 21 monitored patches (n = 30); it did not occur at the smallest beach. seedling densities varied from 0 to 5.2 m2, and these differences are in part explained by viable seed bank densities. seedling survival was low (0.6%) considering the 2823 plants monitored over three years. the main causes of death were wave erosion and burial. no seedlings survived at the beach zone (n = 2684). seedlings survived in the fore dune, in patches of ipomoea pes-caprae (0.8%, n = 119), in recolonization areas where ipomoea pes-caprae was partially removed (80.0%, n = 20) and in recent dune areas, which were reconstructed after intense wave erosion (four seedlings observed). seedling growth was greatest at the latter. experiments showed that one-month-old seedlings did not tolerate burial in 10 cm of sand. when buried by 5 cm of sand, 50.0% of the seedlings survived, but these had fewer leaves, lower biomass and lower allocation to root and shoot development. all established seedlings of ipomoea pes-caprae were recruited in a period without wave erosion; habitat stability was a key factor in ipomoea pes-caprae regeneration.
