Species point records from 1977-79 SWBSS Grassholm, Skomer & Marloes Peninsula survey

Surveys of nearshore sublittoral ecosystems were carried out at Skomer in August 1977, Grassholm in June 1979 and on the Marloes Peninsula near Martins Haven in July 1979. The Skomer surveys were mainly a reconnaissance of the area whilst at Grassholm and Martins Haven, systematic surveys of the abundance of species in different habitats were carried out. The sites studied were subject to widely different regimes of exposure to water movement and included steep cliffs often extending into deep water, broken rock slopes, boulders and a variety of mixed sediments. A total of twenty-one sites were surveyed and the survey results are presented as an annotated list of 89 plant and 201 animal species with a description of each site, and summary of the communities present in different habitats. The survey results for Skomer and Martins Haven have been compared with the descriptions of the nine sublittoral habitats and communities defined for the whole coast of the area by Hunnam (1976). Although there are many similarities in the two sets of data, several of the habitats described here were either not encountered by Hunnam or their individual characteristics were lost in the generalised description of communities within a small number of habitat categories. The area described here included a wide variety of habitats and communities compared to most other locations of similar area in south-west Britain. Several locations were identified as of scientific interest. In addition, several species normally confined to the south or west coasts of the British Isles and abundant around Lundy were recorded but in very small amounts. It is recommended that future work related to conservation interests in the area should include studies of the west coast of Grassholm and The Smalls, and detailed descriptions of habitats and communities at key sites already identified in the region of Skomer. Some further basic survey to include previously undescribed habitats and communities and to provide a basis for mapping is also required in the region of Skomer.

于1977年8月，在斯克默岛对近岸次海底生态系统进行了调查；1979年6月，在格拉索姆岛；同年7月，在马丁斯湾附近的马尔洛斯半岛。斯克默岛的调查主要是对该地区的初步探查，而在格拉索姆岛和马丁斯湾，则对不同栖息地中物种的丰富度进行了系统调查。研究地点受水分运动暴露度的影响差异显著，包括陡峭的海崖，通常延伸至深水区，破碎的岩石坡，巨石以及多种混合沉积物。共计调查了21个地点，调查结果以89种植物和201种动物物种的注释列表呈现，并对每个地点进行了描述，以及不同栖息地中存在的社区概述。斯克默岛和马丁斯湾的调查结果与亨南（1976年）为该区域整个海岸线定义的九种次海底栖息地和社区描述进行了比较。尽管两组数据存在许多相似之处，但此处描述的某些栖息地要么未被亨南遇到，要么其个体特征在少数几个栖息地类别中的一般性社区描述中丧失。与英国西南部大多数类似区域相比，该区域包含了丰富的栖息地和社区。确定了几个具有科学意义的地点。此外，记录了通常局限于英国南部或西部海岸，并在吕迪岛附近丰富的几种物种，但数量极小。建议未来与该区域保护利益相关的工作应包括格拉索姆岛西海岸和斯莫尔斯小岛的调查研究，以及斯克默岛区域内已确定的关键地点的栖息地和社区详细描述。在斯克默岛区域还需要进行一些基本的调查，以包括之前未描述的栖息地和社区，并为制图提供基础。