Phylogeography and environmental diversification of a highly adaptable marine amphipod, Gammarus duebeni

Glacial-driven vicariance in the amphipod Gammarus duebeni.

We have examined the genetic diversity using mitochondrial COI and ND2 sequence data from 306 specimens of the amphi-Atlantic-distributed amphipod Gammarus duebeni. Marine populations from the Atlantic Ocean, the Baltic and North Sea, as well as freshwater populations from Ireland, Cornwall and Brittany were analysed. G. duebeni is a complex of five allopatric lineages. Freshwater populations r...

Sodium influx and loss in freshwater and brackish-water populations of the amphipod Gammarus duebeni Lilljeborg.

The involvement of sodium transport in the volume regulation of the amphipod crustacean, Gammarus duebeni.

The maintenance of body volume forms an integral part of the overall osmoregulation of all metazoan animals. The fact that such regulation occurs in various invertebrates has long been experimentally established and it has been shown that the capacity to regulate the body-water content is particularly well developed in euryhaline species (Beadle, 1937; Ellis, 1937, 1939; Jergensen & Dales, 1967...

Activation of the Sodium Uptake System at High Blood Concentrations in the Amphipod Gammarus Duebeni.

In an earlier paper (Lockwood, 1961) it was shown that the brackish-water amphipod, Gammarus duebeni, begins to form urine hypotonic to the blood about 2 hr. after the animal is transferred from a highly concentrated medium (100-175% sea water) to fresh water. The osmotic concentration of the blood at the time the urine first becomes hypotonic may be as much as 1 M./l. NaCl, a value twice as hi...

Sodium Regulation in the Amphipod Gammarus Duebeni Lilljeborg from Freshwater Localities in Ireland

The detailed distribution of Gammarus duebeni in freshwater habitats is discussed by Hynes (1954) and Sutcliffe (1967a). It occurs in a number of isolated coastal localities situated on the western sea-boards of Britain, including the Isle of Man, and on the Shetlands, the Faroes, Iceland, Norway and Brittany. In most of these localities the amphipod is restricted to only a few of the streams a...