The sediments at Waulkmill Bay must be very fertile judging by the millions of lugworm casts and burrows in the sand. They seem to occupy almost every space of the upper shore, and represent worms of every size, burrowing to different depths.
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Wow. I love the look but I don’t know if I understand the process (I mean The curly parts). Or lugworms, either. My lack of shore knowledge is showing!
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Worm casts are fascinating, like thousands of tiny worm sculptures.
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Lugworms are marine worms that live in the wet sediments on the beach. They wriggle down and create a U-shaped vertical burrow which has an two holes at the surface. The front end of the worm is at one end of the burrow where there is a dip and hole at the surface. The worm eats the sand or mud to remove any organic particles attached to the grains, and then the waste products are squeeze out of the posterior end and deposited on the surface via the second hole of the burrow. The evacuated gut contents have the shape of toothpaste squeezed out of a tube – these are the “curly parts” or worm casts. The diameter of the tubular casts indicates the size if the worm. Small immature worms make a narrower cast. Lighter coloured sediments are from eating aerated sand near the surface of the beach, and the darker coloured casts are made of anaerobic sediments deeper down.
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Thank you. I had no idea. I am not sure we have lugworms here in the eastern US, I will check. This is fascination how it all works, and, that there are so many of them and how they affect the landscape.
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