Filamentous algae at Waulkmill Bay

Thread-like Algae at Waulkmill Bay

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Fine threads of lime green seaweed coil over the beach stones by the river that crosses the shore at Waulkmill Bay on Mainland, Orkney. Larger stones provide a secure attachment for the clumps of Horned Wrack that also favours the lowered salinity occurring with freshwater input at that location. At first I thought that these bright threads were a filamentous algae akin to Cladophora – but now I think it is a type of tubular seaweed like Gutweed (Ulva spp.) in which the narrow tubes have become flattened. Or maybe it is a combination of both.

Marine Life Information Network Filamentous green seaweeds on low salinity infralittoral mixed sediment or rock.

Bunker, F. StP. D., Maggs, C. A., Brodie, J. A., Bunker, A. R. 2017 Seaweeds of Britain and Ireland. Second Edition, Wild Nature Press, Plymouth, UK

4 Replies to “Thread-like Algae at Waulkmill Bay”

  1. Do you have a microscope? To find out more about these, a microscope might be fine. I got one last spring and it is really fun to use. I don’t have a camera attached yet.

    Liked by 1 person

  2. Hi, Nannus. Yes, I do have a binocular microscope at home but I was on holiday when I took these pictures. Like you, I have not been able to fix a camera to it. I also have a small pocket digital microscope but have not yet learnt how to use it with a mobile phone so that I can try it on the beach. A new project for this year – provided I am able to bend down low enough to examine things when I get to the seashore.

    Liked by 1 person

  3. Thank you, Emma. I find I am increasingly drawn to that colour. I have already bought some kitchen utensils that shade – and I see that Seasalt has just introduced new clothing lines that reflect seashore colours like seaweed and seawater inspired by the Scilly Isles.

    Liked by 1 person

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