AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Ensis leei | |
Date of the first record (?) | 1981 References (not structured): Gollasch et al. 2014 in WGITMO Report 2014 (and references therein) Wolff WJ (2005) Non-indigenous marine and estuarine species in The Netherlands. Zool Meded Leiden 79:1–116 (and references therein). Comments: In Europe, E. directus was first positively recorded on June 6, 1979, (German Bight, Elbe-Estuary, von Cosel, et al. 1982) which makes an arrival of larvae transferred with ballast water of vessels from the east coast of the USA likely in 1978 (Von Cosel, et al. 1982). However, a few small Ensis found on tidal flats in the Dutch Wadden Sea near Terschelling in 1977 may have referred to this species (Beukema & Dekker 1995). Swennen et al. (1985) also assume that the introduction of E. directus into Europe took place before 1978, but that the first strong year-class in Europe originated only in 1979. |
Recipient region (?) | Country: Netherlands LME: 22. North Sea References (not structured): Christian Buschbaum, Dagmar Lackschewitz, Karsten Reise. 2012. Nonnative macrobenthos in the Wadden Sea ecosystem. Ocean & Coastal Management. 68, 89-101 |
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Source region (?) | LME: 22. North Sea --> LME sub-region: North Sea |
Pathway / Vector (?) | Level of certainty: Possible Pathway: Natural spread from neighboring countries Vector: Water currents Pathway: Vessels Vector: Ballast water References (not structured): Gollasch et al. 2014 in WGITMO Report 2014 (and references therein) Comments: Old formated values: Pathway - ships; Vector - unintentional |
Habitat type (?) | Estuary Open coast Ports References (not structured): Baetens K., Gittenberger A., Barbut L., Lacroix G. (2018). Assessment of the ecological implications when installing an SRA between Belgium and the Netherlands. Final project report. Royal Belgian Institute of Natural Sciences. Operational Directorate Natural Environment, Ecosystem Modelling. 71 pp. |
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Wave exposure (?) | Sheltered | |
Salinity range (?) | Venice system: 4. β-Mesohaline [5-10psu] 5. α-Mesohaline [10-18psu] 6. Polymixohaline [18-30psu] 7. Euhaline [30-40psu] References (not structured): Gollasch et al. 2014 in WGITMO Report 2014 (and references therein) |
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Temperature range (?) | Min: 2 Max: 22 References (not structured): This is the minimum temperature range, Gollasch et al. 2014 in WGITMO Report 2014 (and references therein). The full temperature tolerance may be wider. Comments: Significant shell growth begins in the Wadden Sea late in a year with minimum water temperatures of 12 - 14°C (Witbaard et al 2013). Growth ceases at about 6°C and confirms that most growth occurs at temperatures above 14°C (Cardoso et al. 2013). The species shows a large annual temperature tolerances, but low winter temperatures seem to limit its development (Essink 1994). |
Zonation / Substratum (?) | Benthic: Sublittoral within photic zone Substratum: Soft (mud to pebbles) |
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Reproductive duration (?) | Not entered | |
Reproductive seasonality (?) | Not entered | |
Migration pattern (?) | Not entered |
Population status (?) | Outbreak (Moderate level of certainty) References (not structured): Gollasch et al. 2014 in WGITMO Report 2014 (and references therein) |
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Species status (?) | Non-indigenous species References (not structured): Essink 1984, Wolff 2005 |
Ports | Port: Vlissingen Date of the first record: 2018 Population status: Not entered References: Baetens K., Gittenberger A., Barbut L., Lacroix G. (2018). Assessment of the ecological implications when installing an SRA between Belgium and the Netherlands. Final project report. Royal Belgian Institute of Natural Sciences. Operational Directorate Natural Environment, Ecosystem Modelling. 71 pp. |
Created by | Stephan Gollasch |
Last update by | Stephan Gollasch, 2020-03-11 |