On a New Species of Gammarus (G. Trigrinus) from Droitwich District

Abstract

The new species of Gammarus here described was first noted in 1931 by Prof. H. Munro Fox, to whom I am indebted for the opportunity of examining it. He found it in abundance in the Droitwich district, living in the brackish waters of the River Salwarpe near the town, in the Canal, and in Wyken Slough near Coventry.

The River Odra Estuary as a Gateway for Alien Species Immigration to the Baltic Sea Basin

“…Within 1988-1991 three new benthic species: the spionid polychaete Marenzelleria viridis (Verrill, 1873), the gammarid crustacean Gammarus tigrinus Sexton, 1939, and another gammarid, Pontogammarus robustoides G. O. Sars, 1894 were found in samples collected in the inshore Pomeranian Bay, -374 382 378 Fig. 3: Records of Gammarus tigrinus in the river Odra estuary prior to 1997 (the animal's image after [45]).…”

“…3: Records of Gammarus tigrinus in the river Odra estuary prior to 1997 (the animal's image after [45]). …”

“…In less than 10 years after its introduction, M. viridis managed to dominate the benthos and (seasonally) the plankton in the northern part of the Odra estuary, especially in the inshore highly productive waters (see also [17]). -Gammarus tigrinus is another North American species, although it was originally described by Sexton from England where it was first found in 1931 [45]. The species has been successfully conquering European continent since the late 1950s [11] and reached the Baltic Sea area (fjord Schlei) by 1975 [22].…”

Distribution and morphology of two helminths recently introduced into European eel populations: Anguillicola crassus (Nematoda, Dracunculoidea) and Paratenuisentis ambiguus (Acanthocephala, Tenuisentidae)

“…G a m m a r u s tigrinus is a n indigenous species of mixohaline coastal w a t e r s b e t w e e n t h e St. Lawrence estuary a n d Florida (Steele & Steele 1972). Since 1939 it h a s b e e n recorded from t h e w e s t coast of England (Sexton 1939) in brackish a n d polluted waters. H y n e s (1955) concluded that it h a d b e e n introduced through t h e action of m a n .…”

Three New Species of Melita (Crustacea: Amphipoda), with Notes on the Amphipod Fauna of the Apalachicola Estuary of Northwest Florida

“…Sexton, 1939). Uncommon, found mainly in low salinity areas near the mouth of the Apalachicola River.…”