What does this research mean for the field?

The Ponto-Caspian amphipod Obesogammarus crassus is present in Lake Ilmen, exhibiting morphological deviations from its original description, and was likely introduced in the early 1980s. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To document the first occurrence of the amphipod Obesogammarus crassus in Lake Ilmen and investigate its morphology.

June 15, 2026Russian Journal of Biological Invasions

The First Record of Obesogammarus crassus (G.O. Sars, 1894) (Amphipoda) in Lake Ilmen

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To document the first occurrence of the amphipod Obesogammarus crassus in Lake Ilmen and investigate its morphology.
Field observations in Lake Ilmen, Novgorod Region, in 2024.
Specimens collected from the littoral zone on hard substrates.
Morphological examination using light and scanning electron microscopy.
O. crassus was identified for the first time in Lake Ilmen, previously only found in Kaliningrad Region.
Morphological analysis revealed deviations from original descriptions, indicating possible intraspecific variability.
Specimens were located in vegetation thickets, indicating a suitable invasive habitat.

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Implication

Report details the introduction of an invasive amphipod species in a new aquatic environment, suggesting ecological implications.

Cite This Study

Ivicheva et al. (2026) studied this question.

synapsesocial.com/papers/6a2f97e8a1cfeec490828e4b https://doi.org/10.1134/s207511172560079x

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The First Record of Obesogammarus crassus (G.O. Sars, 1894) (Amphipoda) in Lake Ilmen

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Discussion

Implication

Cite This Study

The First Record of Obesogammarus crassus (G.O. Sars, 1894) (Amphipoda) in Lake Ilmen

Key Points

Discussion

Implication

Cite This Study

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