Friday, May 07, 2021

Recovery

This made me happy. It used to be, years back, that on any shore, from mid-tide on down, I would see mounds of purple and orange starfish. Then came the epidemic of starfish wasting disease. The purple starfish and the sunfish curled up, fell apart, and died in the millions. And then there were none.

Some days, in the last year, I've seen one or maybe even two starfish and rejoiced. This time, at the very bottom of the low intertidal zone, the starfish are back and healthy, to boot.

Purple starfish, Pisaster ochraceus

In a crack between two rocks, a lineup of starfish, with a red giant chiton.

Purple and orange. One species, two common colours. With green sea urchins.

More purples. That round spot is a hole in the sandstone with another starfish tightly coiled inside. On the far left, there's a small leather star.

So many starfish! Almost like old times! It got so that I was walking past piles of starfish without stopping to take their photos.

A rare pinkish-brown coloured star, with another of the purples.

Leather star, Demasterius imbricata.

The pale yellow circle on the top of this leather star is the madreporite; all starfish and other echinoderms, like the sea urchins and the sea cucumbers, have one, although not always so visible. The madreporite is a plate of porous calcium carbonate which funtions as a sieve regulating the water pressure in the starfish's vascular system.

Two leather stars and green sea urchins in another rock hole.

And not one sign of a rotting arm! So good!

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Esto me hizo feliz. Hace años, acostumbraba ver montones de estrellas de mar, de color azul púrpura o anaranjada, en todas las playas mientras se bajaba la marea. Y luego, por el año 2013, surgió la epidemia de desgaste de estrellas de mar, en la que se torcían y se desbarataban los brazos de las estrellas y los soles de mar, resultando siempre con la muerte del animal. Millones perecieron. Y luego, no se encontraban estrellas sanas en nuestras costas.

Algunas veces durante el año pasado, encontraba una o tal vez hasta dos estrellas cuando la marea bajaba, y me regocijaba. Ahora, en la parte más baja de la zona inferior de la intramareal, han regresado las estrellas, y todas parecen estar sanas. ¡Tantas eran, que por fin, pasaba a su lado sin pararme a sacar fotos! ¡Casi como los tiempos antiguos!

Fotos: estrellas de mar Pisaster ochraceus, anaranjadas y violetas, y estrellas "de cuero" Demasterius imbricatus, con su diseño de manchas anaranjadas. Y algunos erizos de mar verdes.

En la primera de las estrellas "de cuero", se ve claramente un círculo de un color más pálido. Esta es la madreporita, un órgano común a todos los equinodermos, tales como las estrellas de mar, los erizos y el pepino de mar, aunque en algunos apenas se puede ver. Es una placa porosa de carbonato de calcio, que sirve de coladera, y ayuda a mantener la presión del agua en el sistema vascular del animal.



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