Species point records from 1991 MNCR Loch Long (Lochalsh) littoral survey

This rapid survey was undertaken to supplement observations from Loch Long in Connor 1989 (CSD Report 977, MNCR Report SR/010) and particulary to investigate distribution of species on hard substrata in relation to the lowered salinity which eists along Loch Long. The flora and fauna present on hard substrata along Loch Long clearly reflects the salinity gradient. Effects of very low salinity at the head of the loch are less marked than expected with Fucus ceranoides confined to streams. The Fucus muscoides bed was very well developed. The apparently very dense population of Mya arenaria in the sand and sandy mud of the delta at the head of the loch is notable if only because extensive pure sediments areunusual in sealochs.本快速调查旨在补充Connor于1989年针对洛赫朗（Loch Long）开展的观测工作（相关报告包括CSD Report 977与MNCR Report SR/010），并重点探究硬质基质上的物种分布与沿洛赫朗分布的盐度降低现象之间的关联。洛赫朗沿岸硬质基质上的动植物区系清晰地反映了该区域的盐度梯度变化。该海湾湾顶的极低盐度影响较预期更弱，仅在溪流中可见长角墨角藻（Fucus ceranoides）的分布。藓状墨角藻（Fucus muscoides）的藻床发育状况极佳。在该海湾湾顶三角洲的沙质及砂质泥质沉积物中，砂海螂（Mya arenaria）的种群密度极高，这一现象值得关注——究其原因，大面积的纯净单一沉积物在海洋湖湾中实属罕见。