Unexpected high records of non-indigenous foraminiferal species in the eastern English Channel

Jean-Charles, Pavard; Julien, Richirt; Bouchet, Vincent; Maria, Holzmann; Mary, Mcgann; ARMYNOT DU CHÂTELET, ERIC; Pezy, Jean-Philippe; Dauvin, Jean-Claude; Laurent, Seuront

Type de document :

Autre communication scientifique (congrès sans actes - poster - séminaire...): Communication dans un congrès avec actes

Titre :

Unexpected high records of non-indigenous foraminiferal species in the eastern English Channel

Auteur(s) :

Jean-Charles, Pavard [Auteur]
Julien, Richirt [Auteur]
Bouchet, Vincent [Auteur]

Université de Lille
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Maria, Holzmann [Auteur]
Mary, Mcgann [Auteur]
ARMYNOT DU CHÂTELET, ERIC [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Pezy, Jean-Philippe [Auteur]
Morphodynamique Continentale et Côtière [M2C]
Dauvin, Jean-Claude [Auteur]
Morphodynamique Continentale et Côtière [M2C]
Laurent, Seuront [Auteur]

Titre de la manifestation scientifique :

FORAMS 2023

Ville :

Perugia

Pays :

Italie

Date de début de la manifestation scientifique :

2023-06-26

Discipline(s) HAL :

Sciences de l'environnement/Biodiversité et Ecologie

Résumé en anglais : [en]

The English Channel is known as a hotspot of Non-Indigenous Species (NIS). Besides aquaculture, their other main entry is commercial harbours due to globalised shipping through ballast waters and fouling. Recently, we ...
Lire la suite >The English Channel is known as a hotspot of Non-Indigenous Species (NIS). Besides aquaculture, their other main entry is commercial harbours due to globalised shipping through ballast waters and fouling. Recently, we witnessed the emergence of foraminiferal species originating from Asia yet unrecorded in the English Channel i.e. Trochammina hadai, Virgulinella fragilis, Spirobolivina sp. and to a lesser extent Ammonia confertitesta. After presenting some general statements on these newcomers in the eastern English Channel, and potential impacts of these species on their new ecosystems, we will illustrate the arrival of NIS species based on the Ammonia tepida morphogroup that includes the three pseudo-cryptic species, A. aberdoveyensis, A. confertitesta and A. veneta. The morphological discrimination of the latter three species has been recently established, but information on their ecology and habitats is still relatively scarce. This study aims to define distribution patterns of these species at eight sites scattered along the French coasts of the English Channel, covering a total of 39 stations. These sites were classified into two contrasted habitats based on the intensity of anthropogenic influence, either harbours (heavily modified habitat) or less impacted (moderately influenced habitat). The use of IndVal index (measuring the specificity of a species to a given habitat) clearly indicates that A. confertitesta is preferentially recorded in or close to harbours. We then compiled previously reported occurrences of A. confertitesta from literature and compared it with harbour locations in Europe, showing that the species almost always occurs in the vicinity of major commercial harbours. In some cases, A. confertitesta occurs relatively far away from these harbours, suggesting a secondary spread. Our results confirm that A. confertitesta is a NIS in the eastern English Channel, outnumbering it congeneric indigenous species A. aberdoveyensis and A. veneta and becoming the dominant Ammonia species in these heavily modified habitats.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Collections :

Laboratoire d'Océanologie et de Géosciences (LOG) - UMR 8187

Source :

Harvested from HAL

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