Abstract
The paper presents recent records of the North-American amphipod Gammarus tigrinus and the Ponto-Caspian amphipod Pontogammarus robustoides in Latvian territorial waters of the Baltic Sea. P. robustoides was found for the first time in shallow waters of the Gulf of Riga near Jurmala City in June 2009. During field surveys of 2011–2012, P. robustoides and another invader, the North-American amphipod G. tigrinus (detected earlier in Estonian part of the Gulf), were recorded in different sites of the Latvian waters of the Gulf of Riga and in the coastal Lake Liepaja. Abundance ranged between 1–70 ind./m 2 for P. robustoides and 5–100 ind./m 2 for G. tigrinus, suggesting they potential role in the functioning of the benthic community in near future.
Highlights
The number of non-indigenous invertebrates has increased worldwide, resulting in fauna mixing and structural changes of aquatic communities (Leppäkoski et al 2002)
Abundance ranged between 1–70 ind./m2 for P. robustoides and 5–100 ind./m2 for G. tigrinus, suggesting they potential role in the functioning of the benthic community in near future
We predicted the presence in the communities of this Gulf of at least two amphipods (P. robustoides, G. tigrinus) that were discovered recently in the Gulf of Riga (Berezina and Kalinkina 2010; Herkül and Kotta 2007)
Summary
The number of non-indigenous invertebrates has increased worldwide, resulting in fauna mixing and structural changes of aquatic communities (Leppäkoski et al 2002). The paper presents recent records of the North-American amphipod Gammarus tigrinus and the Ponto-Caspian amphipod Pontogammarus robustoides in Latvian territorial waters of the Baltic Sea. P. robustoides was found for the first time in shallow waters of the Gulf of Riga near Jurmala City in June 2009.
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