06/06/18: New invasive species in the Netherlands

Recently, our marine biologist Marco Faasse, specialised in taxonomy, discovered species originating from the Pacific ocean in Dutch waters.

The summaries of his findings are provided below in English, the full text reports are in Dutch.



Pacific barnacles in the Netherlands



After it has been recorded for the first time from Europe in Belgium, the non‐native barnacle Balanus glandula is recorded from the South West of the Netherlands as well, from the mouth of the Westerschelde. Until June 2018 it had not been recorded in Europe north of the Westerschelde.


Published in Macrofaunanieuwsmail 142: 3-5, 3 Mei 2018



Pacific amphipods in the Netherlands



On 11 November 2017 one specimen of the Pacific amphipod Aoroides semicurvatus was collected in the southwestern delta area of the Netherlands. This is the first record from Europe outside France. Subsequently, on 18 and 23 November tens of specimens were collected from about half a liter of red seaweeds from two locations in the Oosterschelde, near Goes and Colijnsplaat. On 99 December red seaweeds from Gorishoek yielded less than ten specimens. The Oosterschelde is an area with shellfish culture and recreational boating. Shellfish imports, or less likely transport with recreational vessels, may have been the introduction vector. Aoroides semicurvatus was mainly collected from the Pacific red seaweed Caulacanthus okamurae on Pacific oysters and boulders in the lower part of the intertidal zone. This microhabitat harbours few native amphipods in the Netherlands. Ecological effects of the introduction are not obvious. An effect that does become more and more obvious is the large and quickly growing proportion of exotic species in the delta area of the Netherlands.


This study was conducted in collaboration with Lukas Verboom and Luna van der Loos, University of Groningen.

Published in Macrofaunanieuwsmail 140: 21-23, 9 januari 2018