Resumen de las observaciones realizadas en cada metro de profundidad en Casamata Noroeste de Isabel II. Autor: Luis Sánchez Tocino. Universidad de Granada
Representación del relieve del terreno en Casamata Noroeste de Isabel II
0m. Los moluscos Patella ferruginea y Phorcus turbinatus junto con el cirrípedo Chthamalus stellatus son los organismos más abundantes en el mediolitoral superior.
0m. El alga Haliptilon virgatum cubre, prácticamente, todo el fondo a esta profundidad.
–1m. Sólo algunos erizos rompen la monotonía de esta comunidad de Haliptilon virgatum.
–2m. El ramoneo de los erizos deja algunas zonas blanquecinas entre las algas.
–3m. En los pequeños extraplomos se aprecian algunas colonias de coral anaranjado (Astroides calycularis). En primer plano se pueden ver varias castañuelas (Chromis chromis).
–4m. En la parte central de la imagen vemos una pequeña comunidad de Algas Calcáreas y Erizos rodeada entre otras por el alga parda Halopteris scoparia.
–5 m. Varios erizos comunes (Paracentrotus lividus) flanquean una pequeña colonia del madreporario Oculina patagónica.
–6m. La competición por el sustrato entre invertebrados y algas se decanta claramente e a favor de estas últimas.
–7m. Una pequeña colonia de la gorgonia Eunicella singularis aparece a esta profundidad.
–8m. Erizos comunes (Paracentrotus lividus), coral anaranjado (Astroides calycularis), gorgonias (Eunicella singularis), algunas muertas o parcialmente epifitadas y esponjas (Chondrosia reniformis y, posiblemente, Cambre cambre) son los invertebrados que podemos ver, a simple vista, en esta fotografía.
–9m. Exceptuando algunas manchas naranjas de las colonias de Astroides calycularis , la pared sigue descendiendo con un monótono color pardo debido a las algas. En la parte inferior izquierda se puede ver un ejemplar del molusco bivalvo Arca noae, cubierto por una esponja roja.
–10m. La inclinación del sustrato y el aumento de la profundidad permite la presencia del alga verde de ambientes umbríos, Flabellia petiolata.
–11m. A esta profundidad la pared vertical da paso a un fondo menos inclinado, formado por bloques de piedra de diferentes tamaños, cubiertos principalmente por el alga parda Halopteris scoparia.
–12m. El bosque de algas pardas se extiende por todo el fondo.
–13m. Un ejemplar solitario de Anemonia viridis destaca por su color amarillo entre las algas pardas.
–14m. El alga parda de color blanquecino Padina pavonica abunda en este fondo blando de arena gruesa con pequeñas piedras.
–15m. El alga Padina pavonica, tan abundante en la imagen, se utiliza mucho en cosmética debido a la gran cantidad de calcio que contiene.
–16m. El transecto corta un promontorio rocoso que aparece por la parte izquierda del mismo y con una gran población de la gorgonia Eunicella singularis.
–17m. Entre la comunidad de Eunicella singularis aparece una colonia muerta de Ellisella paraplexauroides.
–18m. El transecto continúa hacia el centro del canal, que separa la isla de Isabel II de la del Congreso, con un fondo de arena gruesa y pequeñas piedras.
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