Species point records from 1983 OPRU Bardsey and the Lleyn Peninsula littoral survey

The survey was carried out to describe the range of habitats, communities and species present on littoral rock on Bardsey and the Lleyn Peninsula and to classify the sites according to the communities present and their scientific interest and probable nature conservation importance. Sites were selected from the maps and charts to ensure that as wide a range of habitats as possible was surveyed in the time available. Systematic surveys were carried out of open-shore communities and records of the abundance of conspicuous species were obtained from the main subzones on the shore. These results enabled the classification of different shore types based on communities present and topographical features. Particular attention was given to the description of other habitats such as rockpools, boulders and caves. Colour transparency photographs were taken of the shores and species present. Twenty-five sites were described during the survey and a total of 118 algal, 9 lichen and 124 animal taxa was recorded. Six different shore types were described ranging from shores of steep rock which were very exposed to wave action to flat sheltered shores. Separate descriptions were made of the communities present under boulders, in caves and in rockpools. Much of the considerable length of coastline surveyed was of a wave-exposed nature and good examples of exposed shore communities were described. Other more sheltered types of habitat and associated communities were limited in extent. Although flora and fauna characteristic of more southerly latitudes were found within the survey area, the geographical position, range of sea temperatures and configuration of the coastline mitigated against the occurrence of many of these species within the littoral zone. The coastline of Bardsey Island included almost as many different shore types as the whole area surveyed and several southern species present on the island were absent from the adjacent mainland. Unusual communities present within large caves were encountered in the vicinity of St Tudwal's. The area surveyed includes a considerable extent of very similar coastline with locations identified as unusual or particularly rich in species widely seperated. Decisions regarding the location of boundaries for the proposed statutory marine nature reserve will have to consider whether these isolated sites of high scientific interest can be included or whether the central one of Bardsey and the nearby mainland coast, which includes a very wide range of habitats and communities, is a more practical area to propose.

本调查旨在详细描述巴德西岛和莱恩半岛沿岸岩石栖息地的范围、群落及物种组成，并根据现有群落、科学价值及可能的自然保护重要性对场地进行分类。场地选择基于地图和图表，以确保在有限的时间内对尽可能广泛的栖息地进行调查。对开放式海岸群落进行了系统调查，并从海岸的主要子区域收集了显眼物种丰富度的记录。这些结果使得根据群落和地形特征对不同的海岸类型进行分类成为可能。特别关注了对其他栖息地的描述，如岩池、巨石和洞穴。对海岸和现存物种进行了彩色透明摄影。在调查过程中，描述了25个场地，并记录了总计118种藻类、9种地衣和124种动物类群。描述了六种不同的海岸类型，从极易受到波浪侵蚀的陡峭岩石海岸到平坦的避风海岸。对巨石下、洞穴内和岩池中的群落分别进行了详细描述。调查的海岸线大部分是暴露于波浪之中的，并对暴露海岸群落进行了良好的描述。其他更为避风的栖息地类型及其相关群落分布范围有限。尽管在调查区域内发现了特征于更南纬度的植物和动物，但地理位置、海洋温度范围和海岸线构型减缓了这些物种在沿岸区域的分布。巴德西岛的海岸线包含了与整个调查区域几乎一样多的不同海岸类型，岛上的几种南方物种在相邻的陆地上并不存在。在圣图德瓦尔的附近遇到了大型洞穴中不寻常的群落。调查区域包括大量相似的海岸线，其中一些地点被识别为异常或物种多样性特别丰富的地区。关于提议建立法定海洋自然保护区边界位置的决策，必须考虑这些高科学兴趣的孤立场地是否可以包括在内，或者是否以巴德西岛及其附近大陆海岸为中心，该区域包含广泛的栖息地和群落，是一个更实际的提议区域。