Recovery of the encrusting bryozoan, Parasmittina delicatula, from damage at Flinders, Victoria.

Parasmittina delicatula colonies were located on the Flinders pier in early 1999 and assigned to a small size class (10-15mm) or large size class (30mm or more). Each colony was damaged by scraping colony parts according to assigned treatment. The treatments were large control (>30mm diameter), large fragment with edge intact, large fragment with edge removed, central fragment, small control and small fragment with edge removed (see attached resource for more details). Colonies were photographed in situ with an underwater camera using slide film at intervals of 1, 2, 3, 4 and 8 months. A total of 56 established colonies were photographed over the 8 month period. In the laboratory, the slides were projected onto graph paper, and the outlines of the colonies traced. The images were then scanned and colony survival, morality, size, growth and fragmentation were recorded using SigmaScan 2.0.

1999年初，研究人员在弗林德斯码头发现了优美副膜孔苔虫（Parasmittina delicatula）的群落，并将其划分为小型（10~15mm）与大型（30mm及以上）两个尺寸等级。随后按照预设处理方案，通过刮除群落部分组织对每个群落施加损伤处理。设置的处理组包括：大型对照组（直径＞30mm）、边缘完整的大型片段、去除边缘的大型片段、中央片段、小型对照组以及去除边缘的小型片段（详细信息参见附件资源）。分别以1、2、3、4和8个月为间隔，使用搭载幻灯片胶片的水下相机对群落进行原位拍摄。在整个8个月的观测周期内，共计对56个已定植群落完成拍摄。在实验室中，将拍摄用的幻灯片投影至方格纸上并描记群落轮廓；随后对扫描得到的图像使用SigmaScan 2.0软件进行分析，记录群落的存活状态、死亡率、尺寸、生长及碎裂情况。