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Changes in species composition of the genus Gammarus Fabr. in Puck Bay

Jęczmień W., Szaniawska A.

Oceanologia

2000

No. 42 (1)

71--87

This paper describes the current species composition of the genus Gammarus in Puck Bay (western Gulf of Gdansk, Poland). Samples were taken at 9 shallow (ca 0.4 m deep) and 4 deeper (ca 10 m) stations from April 1997 to March 1998. Six Gammarus species were recorded. Gammarus salinus was the most numerous, making up 34.95% of the total of identified amphipod specimens. This species was common throughout the bay but rarely predominant. G. zaddachi (34.75%) was dominant in the northern part of the bay from January to April and was found in almost 2/3 of samples. Less numerous were G. oceanicus (19.15%), common in the southern and eastern parts of Puck Bay, and G. duebeni (9.85%), prevalent in shallow and rocky locations. G. inequicauda and G. locusta made up only 1.13% and 0.12% of the total amphipod material respectively. The species composition of the genus varied considerably not only from one sampling locality to another but also from season to season. It is possible that two species (G. locusta and G. inequicauda) are currently withdrawing from Puck Bay.