Sighting of Saccorhiza polyschides (Lightfoot) Batters (Phaeophyceae, Stramenopiles) in Algeria (Mediterranean Sea): an insight into range expansion routes
International audience In the Mediterranean Sea, the north-east Atlantic seaweed Saccorhiza polyschides (Lightfoot) Batters is uncommon. The only permanent populations are located in the Alboran Sea near the Strait of Gibraltar and the Strait of Messina (Italy). In contrast, since the early 19th cen...
Main Authors: | , , , |
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Other Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2020
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Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-02531157 https://hal.archives-ouvertes.fr/hal-02531157/document https://hal.archives-ouvertes.fr/hal-02531157/file/Boudouresque_et_al_Saccorhiza_HAL.pdf |
Summary: | International audience In the Mediterranean Sea, the north-east Atlantic seaweed Saccorhiza polyschides (Lightfoot) Batters is uncommon. The only permanent populations are located in the Alboran Sea near the Strait of Gibraltar and the Strait of Messina (Italy). In contrast, since the early 19th century, several sightings, on ship’s hulls or in harbours, reflect the dispersal of propagules which failed to establish in the Mediterranean. Here we report a new sighting of Saccorhiza polyschides, near the port of Jijel, Algeria. This first new record in the Mediterranean for more than a century indicates that the dispersal of propagules continues today. In addition, because of its spectacular size and ease of its observation, it sheds light on the expansion routes of a species at the limit of their current range area. En Méditerranée, la macroalgue du nord-est de l’Atlantique Saccorhiza polyschides (Lightfoot) Batters n’est pas commune. Les seules populations permanentes sont celles de la mer d’Alboran, près du détroit de Gibraltar et du détroit de Messine (Italie). Depuis le début du xixe siècle, plusieurs observations, sur des coques de bateaux ou dans des ports, traduisent la dispersion de propagules en Méditerranée; l’espèce n’y a pas dépassé le stade d’adventice. L’observation de Saccorhiza polyschides près du port de Jijel (Algérie), la première nouvelle observation en Méditerranée depuis plus d’un siècle, montre que la dispersion de propagules en Méditerranée se poursuit de nos jours. De plus, grâce à sa taille et à la facilité de son observation, elle contribue à illustrer les voies d’expansion d’une espèce à la limite de son aire actuelle de distribution. |
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