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Gammarus tigrinus Sexton 1939 (Crustacea, Amphipoda) - a new immigrant in the Puck Bay, southern Baltic Sea

Szaniawska A., Normant M., Łapucki T.

Oceanological and Hydrobiological Studies

2005

Vol. 34, No.2

71--78

This study deals with the occurrence and migration of Gammarus tigrinus Sexton 1939 into the Puck Bay (western part of the Gulf of Gdansk, Baltic Sea). The material was collected in September 2002 at nine stations (approximate depth – 0.4 m). The only Gammarus species found at five sampling stations was G. tigrinus. The species found at other stations located along the inner part of the Puck Bay were G. salinus, G. zaddachi, and G. duebeni. The sex ratio for G. tigrinus was close to 1. Almost 50% of the females were carrying eggs. The males were larger (6.0 š 0.8 mm) than females (4.7 š 0.8 mm). The average male dry weight was 2.5 š 1.2 mg and that of females was 2.1 š 0.7 mg. The relation between length (L) and dry weight (DW) was DW = 0.095źL1.76 (R2 = 0.76). This study indicates that G. tigrinus is spreading rapidly in the Baltic Sea.

The invasive amphipod Gammarus tigrinus Sexton, 1939, in Puck Bay [commun.]

Szaniawska A., Łapucki T., Normant M.

Oceanologia

2003

No. 45 (3)

507-510

The paper is a report on the occurrence of the species Gammarus tigrinus Sexton, 1939, in the coastal waters of Puck Bay.