domenica 29 marzo 2009

I fondali sabbiosi

Nello scorso post abbiamo accennato ai tipi di substrato che caratterizzano l'ambiente marino; sicuramente per tutti i subacquei i fondi duri (relitti, pareti, secche) sono l'ambiente ideale per fare un'immersione....i fondi molli sono sempre bistrattati perchè sembrano dei deserti realtà non è così...soprattutto di notte fanno vedere le loro meraviglie!!

Iniziamo col dire che i fondi molli rappresentano circa il 75% delle nostre coste e che vengono classificati in base alle dimensioni granulometriche del sedimento che li costituisce.
Essi sono molto influenzati dal moto ondoso, specialmente sottocosta, e dalle correnti quindi la loro morfologia cambia continuamente.
Le forme più comuni di questo tipo di fondali sono i ripples mark che sono delle ondulazioni di solito parallele a costa.
I fondi sabbiosi sono abitati in prevalenza da animali che vivono all'interno del sedimento (è per questo che appaiono come dei deserti) ma ci sono anche alcune specie che vivono sopra la sabbia anche se si vedono soprattutto di notte.
Questo tipo di fondale è il regno degli anellidi (vermi) e dei molluschi (soprattutto bivalvi) ma si trovano anche tanti echinodermi - i famosi ricci dollaro anch'essi "nottambuli", stelle ed oloturie- e pesci - specialmente pesci piatti.

Ora basta chiacchiere...ecco alcune tra le simpatiche bestiole che potete trovare sui fondi sabbiosi!

(1) (2)

(1) Halcampoides purpurea; (2) Raja clavata; (3) Astropecten aranciacus; (4) Spatangus purpureus

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Piano piano soddisferemo tutte le curiosità!! foto dell'Halcapoides purpurea (foto 1) è di Vittorio....a Cesare quello chè è di Cesare...soprattutto perchè la foto è molto bella e da un punto di vista biologico rara!! Grande Victor!!

Vittorio (Archimede) ha detto...

Brava Ilaria, bel post, solitamente non vado in giro per sabbioni ,ma chissà che non ti fornisca qualche altra foto interessante.

Un abbraccio.

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Roberto ha detto...

La foto (3) non è Astropecten aranciacus ma è Astropecten jonstoni.
La (4) non penso possa essere Spatangus purpureus, mi sembra Echinocardium sp.

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