Saturday, April 29, 2023

Cushioned wall

Eons ago, the glaciers slid off the emerging mountain peaks that form the bulk of Vancouver Island, and crawled slowly into the sea. As they reached the water, they sped up, carving long scratches into the rocks beneath them, dropping rocks as they melted into the sea water.

Along Stories Beach in Campbell River, they left these long dikes.

All sand on the north side of the dike, mostly rocks and stones on the south.

It almost looks like a human-built wall.

The dikes at this level of the intertidal zone are usually out of water at low tide. Some, but not much, seaweed grows on them. Tiny barnacles cover large portions of the rocks. In the sand alongside, look at pockmarks in the sand; down below, you'll probably find green sea anemones.

And they're there, in great numbers, along the vertical faces of the dikes.

A section of dike wall.

Coming closer.

And zooming in.

They grow in patches, separated by areas of clean rock.  Could this be evidence of colony war?

"Colonies of clones actually war against each other." (Marine Life of the PNW)

Probably the only way to be sure would be to compare their DNA. Not on the books at the moment.

Another colony. The small white circles are acorn barnacles. The large barnacles are the gianrt acorn barnacles.
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Hace milenios, los glaciares bajaron de las montañas que forman la isla de Vancouver, y se deslizaron hacia el mar. Al llegar al agua, aceleraron su marcha, haciendo grietas largas en el sustrato, abandonando rocas y piedras al descongelarse.

En la playa Stories Beach, en Campbell River, dejaron atrás estos diques.

Foto #1: En el lado norte del dique, hay arena; al lado del sur, los glaciares dejaron rocas y piedras.

#2: El lado norte del dique casi parece un viejo muro hecho por humanos.

Los diques a este nivel de la zona intramareal casi siempre quedan fuera del agua a marea baja. Unas pocas algas marinas crecen allí, y muchos balanitos. Entre la arena, si buscas en las depresiones pequeñas, encontrarás anémonas verdes.

Y en la parte baja del muro, allí están, en gran núnero.

 #3 a 5: Una parte del muro, vista de lejitos, de más cerca, y aun más cerca.

Crecen en grupo separados por areas limpias de la roca. ¿Será esto un indicio de las dichas "guerras" entre colonias?
"Las colonias compuestas de clones hasta llegan a hacer guerra contra otras." (De la enciclopedia Marine Life PNW)
Solo con una secuenciación de su ADN, se podrá saber por cierto. Por ahora, quien sabe.

#6: Otro grupo de anémonas. Los circulitos blancos son bálanos chicos, Balanus glandula; los bálanos grandes son Balanus nubilus.

2 comments:

  1. Not saying it's not, but I wonder if it's less about a colony war, and more about not wanting to stick out. It's hard to tell from the photograph, but it seems that they are huddled within minor recesses of the rock face, where there is slightly better protection.

    ReplyDelete
    Replies
    1. That's possible. I'll investigate that next time I get down to that beach.

      Delete

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