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，研究人员于弗林德斯码头发现精致副膜孔苔虫（Parasmittina delicatula）的群体样本，并将其划分为小型组（10~15毫米）与大型组（30毫米及以上）。所有受试群体均按照预设处理方案，通过刮除部分群体组织施加损伤。本次实验的处理组别包括：大型对照组（直径＞30毫米）、边缘完整的大型断片组、边缘去除的大型断片组、中央断片组、小型对照组，以及边缘去除的小型断片组（详细信息参见附件资料）。研究人员使用搭载正片胶片的水下相机，分别于第1、2、3、4和8个月对原位群体进行拍摄。在为期8个月的观测周期内，共计完成56个已定植群体的拍摄工作。在实验室环境中，研究人员将胶片幻灯片投影至方格纸上，描摹出群体的轮廓。随后对扫描得到的图像进行分析，借助SigmaScan 2.0软件记录群体的存活状态、死亡率、尺寸、生长情况以及断片化事件。