Sunday, September 13, 2020

Staying put

About those pilings:

All that remains

Once upon a time, long ago, there used to be a small dock here, at the far end of the beach south of Oyster Bay. All that is left is the double line of pilings, covered with mussels and barnacles.

Mostly mussels, Mytilus trossulus

And little acorn barnacles.

Peering into tide pools, or flipping rocks, or looking at masses of animals, like these, I take photos. Not very good photos, mostly; what there is to see is too muddled for the camera to focus, and I can't focus manually, wobbling on the mostly precarious footing. But at home, I zoom in and inspect the photos carefully; there's usually something I could not see without the help of the camera. They're not usually clear even then; I see the striped antenna of a hairy hermit, the angle of the knee of a kelp crab, a smiley face on the back of a shore crab, maybe a glimpse of the curved back of an amphipod or a flash of the iridescent body of a worm. There may be baby sea urchins, or a few tentacles of an anemone. Snails and limpets, usually.

In these mussel photos, and several more, there are barnacles. Not a hint of anything leggy. Barnacles and mussels, mussels and barnacles. Four or five small snails, on the outer edges of the clump.

 The thing is, mussels are dangerous to anything that wants to move about. Barnacles are sessile; once they're settled, they're there for life. But if you need to move to find food, better stay away from mussels. They tie themselves down to the substrate with incredibly tough threads, called byssal threads; I try to separate a few tied together by pulling them apart; can't be done. I would need a knife. One alone, I can handle with a good pull. And they tie down anything they touch.

I have put a few mussels in my aquarium; they're good filters. But I have to keep an eye on them; they capture wandering snails, tie them down, and let them die of starvation.

The mussels that have died and are gaping open have probably been eaten by swimming things.

Another couple of photos: the pilings are hollow, the inner wood eaten away. It was dark inside, and I couldn't see anything, but I poked the camera in and let the flash expose whatever was in there. I wish I had taken more: here are two that I took before I decided it was useless.

Most of the mussels and barnacles are on the outside. Inside, a red feather-duster tubeworm, a plumose anemone, sea lettuce.

A better look at the anemone.

~~~~~~~~~~~

Esos pilotes ...

Hace tiempo, había un muelle pequeño aquí al final de la playa al sur de Oyster Bay. Ahora no queda más que los pilotes, cubiertos de mejillones y bálanos.

En la playa, investigando pozas de marea, volteando piedras, o examinando masas de animales como estos, saco fotos. Muchas fotos, no muy buenas, ya que la cámara no puede decidir a donde enfocar, y no puedo usar enfoque a mano, puesto que estoy tambaleando sobre suelos resbalosos o temblantes. Pero en casa, examino esas fotos cuidadosamente, porque siempre hay algo que no pude ver a simple vista. La antena de un cangrejo ermitaño, Pagurus hirsutiusculus, el ángulo de la rodilla de un cangrejo "kelp", la cara sonriente marcada en el dorso de un cangrejo común, tal vez una fracción del dorso redondeado de un anfípodo, o los colores iridiscente de un gusano poliqueto. Habrá erizos de mar infantiles, los tentáculos de una anémona. Caracoles marinos y lapas, casi siempre.

En estas fotos de mejillones, y varias más que saqué en los pilotes, hay bálanos. Y ni un atisbo de nada con patas. Mejillones y bálanos, bálanos y mejillones. Unos cuatro o cinco conchas por las orillas.

La cosa es que los mejillones son peligrosos. Por lo menos, si algo quiere moverse. Los bálanos son sésiles; se adhieren a una superficie y nunca más se mueven. Pero si eres algo que tienes que andar de aquí para allá buscando comida, hay que evitar los mejillones. Ellos extienden sus lazos, los dichos hilos "byssus", muy fuertes, y amarran todo lo que tocan. He tratado de separar varios mejillones amarrados juntos; no pude. Necesitaba un cuchillo. Un mejillón en una piedra, si, con trabajos. Son increíblemente fuertes.

He traído a casa unos para añadirlos al acuario. Son animales filtrantes muy buenos. Pero los tengo que vigilar; atrapan y amarran conchas marinas, y las detienen hasta que se mueren de hambre.

El centro de los pilotes están vacíos. La madera interior se ha disuelto. Está muy oscuro ahí dentro, pero metí la cámara, usando el 'flash".  Lástima que no saqué más que tres o cuatro fotos antes de darme por vencida. Resulta que lo que vive adentro es distinto que lo que se halla afuera.

Estas dos fotos tienen un anélido de tubo "plumero", mostrando su flor rojo, y una anémona "Metridium senile", y un poco de alga "lechuga de mar".


2 comments:

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