Nederlands Soortenregister

Overzicht van de Nederlandse biodiversiteit

Arachnidium lacourti

Indeling

Arachnidiidae [familie]
Arachnidium [genus] (2/1)
lacourti [soort]

Indeling

Arachnidiidae [familie]
Arachnidium [genus] (2/1)
lacourti [soort]

Exotenpaspoort ?

Exotenstatus Gevestigd
Frequentie Lokaal
Invasiviteit Niet invasief
Jaar van eerste melding 2006
Type introductie Onbekend
Wijze van introductie
  • Aquacultuur
  • Ballastwater schip/boot
  • Aangroei op scheepsrompen
  • Vastgesteld in provincies
  • Zuid-Holland
  • Zeeland
  • Habitats Estuaria en brakwatergebieden
    Natuurlijke verspreiding
  • Europa
  • Onbekend
  • Beschrijving invasiviteit (Engels) A. lacourti is considered by the describers, d'Hont & Faasse (2006) as an invasive species because of the distributional pattern, which is often seen with species distributed through intercontinental shipping. They argue as follows: ""as the Iocalities are situated along waterways to two of the largest ports in Europe, we assume the bryozoan is an introduced species. The chance that a native intertidal bryozoan in north-westem Europe goes undetected until now are very low"". No data could be traced about its invasiveness in the Netherlands or elsewhere in north-westem Europe. Pathways for the introduction could be intercontinental shipping (ballastwater or ship/boat hull fouling), but accidental import with deliberate translocations of fish or shellfish can not be ruled out either however.
    Beschrijving (potentiële) ecologische impact (Engels) In the Netherlands there are no indications on any ecological impact.
    Beschrijving (potentiële) economische impact (Engels) In the Netherlands this species has no economical impact.
    Beschrijving verspreiding binnen Nederland (Engels) In the eastem part of the Westeschelde a large proportion of the fauna on boulders consists of introduced species: from data in Van Moorsel (2003) a proportion of 35% of introduced species could be calculated (d'Hondt & Faase 2006). Although the typelocality lies in the Netherlands, the original natural distribution of A. lacourti might very well be elesewhere in the world, but is at present unknown. The first time the species was found in the Netherlands was in 1999. The exact date is unknown. It concerns a dried out colony on a Crassostrea gigas (Thunberg, 1793) collected by M.A. Faasse near Bath in the eastern part of the Westerschelde (Western Scheldt), not very far from the entrance of the Zeescheldt to the Antwerpen-harbour. The holotype is also from Bath, collected at july 5, 2003 (part of a colony on Balanus improvisus Darwin, 1854). Subsequently the species was also found near the harbour of Rotterdam, in the Nieuwe Waterweg (New Waterway) on boulders and on Balanus improvisus at august 9, 2004 and august 17, 2004. The species lives in oligo-mesohaline (brackish) conditions in the lower half of the intertidal zone.

    Publicaties