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1

Impact of invasive benthic crustaceans on the resuspension of bottom sediments: an experimental study approach

100%
Zaiko A., Olenin S.
|
2004
|
issue 3
99-110
EN
The resuspension process caused by the burrowing activity of three Ponto-Caspian amphipod species (Pontogammarus robustoides, P. crassus and Chaetogammarus ischus) introduced to the Curonian Lagoon, Baltic Sea, was studied in a laboratory. The experimental set-up included aquaria with three types of bottom sediments: 1) sand; 2) sand with pebbles; 3) sand with stones up to 30 cm in diameter. The experimental aquaria contained amphipods in numbers that mimicked their density in situ, while control aquaria contained no animals. Water was sampled from three different layers (1, 5, and 9 cm above the sediment surface) from experimental and control aquaria and analyzed with a spectrophotometer at a wavelength of 660 nm in order to estimate the density of suspended material. The burrowing activity of the amphipods in all sediment types increased the amount of suspended material throughout the studied water layer (10 cm). The most visible effect was detected above the sandy bottom with large stones, the least ? above the sandy-pebble bottom. The conclusion was drawn that the invasive burrowing amphipods can increase the resuspension of bottom sediments in invaded ecosystems.
2

The sandhopper (Talitrus saltator, Montagu 1808) on the Polish Baltic coast. Is it a victim of increased tourism?

100%
Weslawski J. M., Stanek S. A., Stanek A., Siewert S. A., Siewert A., Beer B. N., Beer N.
|
2000
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vol. 29
|
issue 1
77-87
EN
Sandhopper occurrence and their habitat preferences were examined at 10 km intervals along 500 km of the Polish coastline in 1997. The sandy beach coastline was divided into 5 types based on physical factors. Compared to earlier data from 1950-70, sandhoppers were found in only 44% of their former sites of occurrence. In all sites examined, sandhopper density was markedly lower (an average of below 20 ind. m-2) compared to the former data (an average of 150 ind. m-2). The reasons for the sharp decline in sandhopper occurrence are discussed pointing at the increase of touristic activity and changes in trophic conditions as the most likely cause. Contamination alone is unlikely to affect the sandhoppers, since the most contaminated beaches at the Vistula Spit have been those with the highest sandhopper density observed recently.
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