Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Peracarid crustaceans in the River Danube and its tributaries: results of the 4th Joint Danube Survey.

Abstract

The River Danube has played a pivotal role in the range expansion of Ponto-Caspian faunal elements in recent decades; therefore, the monitoring of its biota is of high scientific and conservation importance. In this publication, the records on peracarid crustaceans yielded by the macrozoobenthos samples for the 4th Joint Danube Survey (2019) are presented. Altogether 21 species (16 Amphipoda, 2 Isopoda, 3 Mysida) were recorded at 44 sites in the Danube (between river km 2581 and 18) and its major tributaries. Invasive Ponto-Caspian species showed the most common occurrence, some of which (Chelicorophium robustum, Chelicorophium sowinskyi, and Paramysis lacustris) have been observed beyond their previously known distribution. Nevertheless, the records of Gammarus spp. in the German Danube section might potentially indicate an improvement in the status of these native species in the region. The survey also confirmed the intensifying colonization of the River Tisza by Ponto-Caspian species, showing the first record of C. robustum in the river as well as additional occurrences of the previous invader, Pontogammarus robustoides. Besides these notable records, the dataset will also serve as a useful reference for potential further range expansions.