Acrothamnion preissii Species Gallery (0030)

Acrothamnion preissii Species Gallery (0020)

Scientific Name:

Acrothamnion preissii

Κοινό όνομα:

No common name

Ταξινομική Ομάδα:

Φύκη

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Πληροφορίες

Διαγνωστικά χαρακτηριστικά

Clumps of loose algae, rose-red in colour and highly branched, 0.5–1.5 cm long, forming dense monospecific mats up to 1 cm thick. The thallus is attached to the substrate or other algae by rhizoids.

The species can only be identified under a binocular microscope. Consequently, accurate identification might need to be checked by a specialist in this group.

Central cells are cylindrical, without cortication; main branches measure 150–300 µm long and 40–60 µm wide. In general, each central cell produces 3–4 lateral branches distally. Terminal gland cells, observed at the end of most branches, are transversely ovoid, 16–22 µm in diameter.

Αναγνώριση / Ενδιαίτημα

Often found as an epiphyte on sea grasses such as Posidonia oceanica or various algae, from shallow subtidal zones to depths of nearly 40 m. As an invasive species, it forms dense cotton-wool-like tufts, mostly in dim light conditions (i.e. on Posidonia oceanica rhizomes, in maerl beds, or in cave entrances and crevices).

Αναπαραγωγή

Στη Μεσόγειο Θάλασσα είναι γνωστή μόνο η αγενής αναπαραγωγή και δεν έχουν βρεθεί γόνιμα δείγματα.

Περιγραφή παρόμοιου είδους

Although it can easily be confused with other filamentous red algae (i.e. Womersleyella setacea) when directly observed in the field, the presence of terminal gland cells at the end of most branches is a useful character for identifying Acrothamnion preissii.

Acrothamnion preissii Similar Species (0010) EL — **Womersleyella setacea**

Παρόμοια είδη

Επιστημονικό όνομα: Womersleyella setacea

Κοινό όνομα: No common name

Ταξινομική Ομάδα: Φύκη

Ιστορία και τρόπος εισαγωγής

An Indo-Pacific species native to Western Australia, New Zealand, South Africa and Japan that has probably been introduced into Europe by maritime transport (on ship hulls). At present, it is mainly distributed in the north-western Mediterranean, forming invasive populations in France, Italy, Monaco and Spain.

Οικολογικές επιπτώσεις

Ecological impacts of the red alga Acrothamnion preissii are still largely unknown but, when invasive, it becomes dominant outcompeting or replacing most native algal species.

Οικονομικές επιπτώσεις

Δεν είναι γνωστό.

Διαχειριστικά μέτρα

Μόλις γίνει εισβολικό, η εξάλειψη και ακόμη και ο περιορισμός τους δεν είναι δυνατός. Το είδος μπορεί να ελεγχθεί με τον πιο αποτελεσματικό τρόπο, και με το χαμηλότερο κόστος πριν εξαπλωθεί.

Επιπλέον πληροφορίες

Ferrer, E., et al. 1994. The spread of Acrothamnion preissii (Sonder) Wollaston (Rhodophyta , Ceramiaceae) in the Mediterranean Sea: New record from the Balearic Islands. Fl. Medit. 4, 163-166.

Klein, J.C. & Verlaque, M., 2011. Macroalgae newly recorded, rare or introduced to the French Mediterranean coast. Cryptogamie Algologie 31(2), 111-130.

Piazzi,l. & F. Cinelli., 2000. Effects of expansion of introduced Rhodophyceae Acrothamnion preisii and Womersleyella setacea on the algal communites of Posidonia oceanica rhizomes in the western Mediterranean. Cryptogam. Algol., 21(3): 291-300.

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