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The North-American amphipods, Melita nitida Smith, 1873 and Incisocalliope aestuarius (Watling and Maurer, 1973) (Crustacea: Amphipoda: Gammaridea), introduced to the western Scheldt estuary (The Netherlands)
Faasse, M.; Van Moorsel, G. (2003). The North-American amphipods, Melita nitida Smith, 1873 and Incisocalliope aestuarius (Watling and Maurer, 1973) (Crustacea: Amphipoda: Gammaridea), introduced to the western Scheldt estuary (The Netherlands). Aquat. Ecol. 37(1): 13-22. https://dx.doi.org/10.1023/A:1022120729031
In: Aquatic Ecology. Springer: Dordrecht; London; Boston. ISSN 1386-2588; e-ISSN 1573-5125, more
Peer reviewed article  

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Keywords
    Fauna > Aquatic organisms > Aquatic animals > Shellfish
    Substrata > Artificial substrata
    Taxa > Species > Introduced species
    Water bodies > Coastal waters > Coastal landforms > Coastal inlets > Estuaries
    Amphipoda [WoRMS]; Crustacea [WoRMS]; Gammaridae Latreille, 1802 [WoRMS]; Incisocalliope aestuarius (Watling & Maurer, 1973) [WoRMS]; Incisocalliope aestuarius (Watling & Maurer, 1973) [WoRMS]; Melita nitida S.I. Smith in Verrill & Smith, 1874 [WoRMS]; Melita nitida S.I. Smith in Verrill & Smith, 1874 [WoRMS]
    AE, North Atlantic [Marine Regions]; ANE, Netherlands, Westerschelde [Marine Regions]
    Marine/Coastal; Brackish water
Author keywords
    Amphipoda; Estuary; Hard substrates; Incisocalliope aestuarius; Introduction; Melita nitida

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Abstract
    The American amphipod species Melita nitida and Incisocalliope aestuarius have been found in the Western Scheldt estuary (the Netherlands). This is the first record of these species in the north-east Atlantic. Shipping is the most likely vector of introduction. The distribution of both species is investigated and compared with the distribution and the microhabitat of co-occurring amphipod species. Melita nitida is known from both the east and west coast of North America and I. aestuarius originates from the east coast of North America. Until now neither has been reported from other parts of the world. In the Netherlands both species are restricted to the mesohaline part of the Western Scheldt. Melita nitida occurs predominantly under Pacific oysters at the underside of boulders, mainly sublittorally. Incisocalliope aestuarius is associated to hydrozoans. Both microhabitats are hardly utilized by other amphipod species. Therefore, the theory that the existence of many empty niches in north-western European brackish waters make this environment particularly susceptible to invasions of alien species is corroborated. The application of hard substrates in a region originally predominated by soft bottoms moreover facilitates the introduction of exotic species. The species community on hard substrates in the mesohaline part of the Western Scheldt contains a high proportion of introduced species: approximately one third of the macrofauna species is of allochthonous origin.

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