Original paper
Ecological zoogeography of Palaemonetes antennarius (Crustacea, Decapoda)
Dalla Via, G. J.
Archiv für Hydrobiologie Volume 106 Number 2 (1986), p. 251 - 262
35 references
published: Mar 24, 1986
DOI: 10.1127/archiv-hydrobiol/106/1986/251
ArtNo. ESP141010602007, Price: 29.00 €
Abstract
The fresh and brackish water shrimp Palaemonetes antennarius shows specific ecological and physiological requirements, as is reflected in its distribution pattern. These requirements are discussed and reviewed for the species found in Italian lakes, lagoons and rivers. Water temperature influences the occurrence of the shrimps. A temperature level above 18—20 °C and continuing for at least 3—4 months is necessary. Palaemonetes antennarius occurs only in waters with pH-values above 8.0. The ion requirements of Palaemonetes antennarius are very specific. In fresh water the critical Na+-concentration lies between 0.125 and 0.183 mM Na+/l at 0.8 mM Ca++/l. Below these levels the mortality rate increases. In 4 ‰ brackish water the critical Ca++-level drops to 0.09 mM Ca++/l. In fresh water as well as in brackish water a high Na+-concentration can compensate for a Ca++-concentration that is lower than required by the shrimps. The upper limit of the tolerable salinity range of Palaemonetes antennarius is around 20 ‰. The highest survival rate of the species in brackish water results at 3-5 ‰.
Keywords
ecological • physiological • Italian lakes • shrimps