Friday, May 29, 2026

Wind and waves and seaweed knees

 It was a windy afternoon. Not cold, not rainy. Just windy. I went to the beach to look at waves.

Just waves and rocks.

The water was bringing in piles of freshly ripped up seaweeds with each wave, dropping it well below the usual line of drying stuff at the high-tide line,

Overview

It's mostly rockweed and sea cauliflower.

Sea cauliflower, Leathesia marina, rockweed, sea lettuce, and shreds of some brown, wiry species.

An articulated coralline alga, with sea cauliflower cushions.

The same photo, cropped for iNaturalist, for a better look at the structure.

These coralline algae are red when alive, but turn white quickly when they die. Each hard, calcified segment is separated from the next by a flexible "knee", called a "geniculum", which allows the alga to survive in the strong currents of our coast. iNaturalist's program identifies this sample as "Genus Calliarthron, a member of ... Family Corallinaceae", but identification is iffy without a human input; there are several possibilities.

Back at the car, I took a photo through the windshield from my parking space.

The flowers are dandelions, daisies, pink clover, and a yellow mustard species. Just out of sight, the beach peas are flowering.

~~~~~~~~~~~~~
El dia era agradable; no hacía ni calor ni frio, no llovía, pero soplaba un viento fuerte. Fui a la playa para mirar las olas.

    1. Olas y piedras.

    2. Las olas traían grandes cantidades de algas rotas, recién arrancadas del fondo, y las amontonaban a media playa.

    3. La mayoría de las ofrendas del dia eran Fucus sp. y el "coliflor marino", Leathesia marina.

   4. Los "cojines" de Leathesia marina, un poco de Fucus sp. (a la izquierda), lechuga marina, Ulva sp., y fragmentos de un alga parda.

    5. Un alga coralina articulada, con dos cojines de coliflor marina.

    6. La misma foto, recortada para iNaturalist, para mostrar mejor la forma del alga.

Estas algas coralinas son rojas en vida, pero se vuelven blancas al morir. Cada sección calcificada se separa de la próxima por una "rodilla" flexible, llamada el genículo, que permite el movimiento necesario para mantener el alga con vida en las corrientes fuertes de nuestras aguas.  El programa de iNaturalist identifica esta muestra como Género Calliarthron, miembro de ... la Familia Corallinaceae", pero hay varias posibilidades; falta la confirmación por un experto humano.

    7. Volviendo al estacionamiento, saqué una foto desde el interior del coche. Las flores son dientes de león, margaritas, treboles color de rosa, y uno de los brasicales amarillos. 


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