Zur Überwindung der biologischen Grenze Meer—Land durch Mollusken

  title={Zur {\"U}berwindung der biologischen Grenze Meer—Land durch Mollusken},
  author={Ursula Seelemann},
SummaryUp to now little attention has been paid to the phylogenetic emigration of gastropods from the sea: almost nothing is known about the physiological changes which enable snails to live in terrestrial habitats. To help solve this question, experiments were carried out on Alderia modesta, an opisthobranch slug of the lower supralittoral, and Ovatella myositis, a primitive pulmonate snail of the upper supralittoral. In each case two subspecies were studied.North Sea Alderias differ from… 

Zur Biologie und Ökologie von Halacarus basteri basteri Johnson 1836 (Acari, Trombidiformes)

The carnivorous marine mite Halacarus basteri was reared on blotting paper in artificial sea water of different salinities, showing a hypertonic-hypotonic regulation and standing extremely low temperature without damage.

Population dynamics, biomass and productivity of Limapontia depressa (Gastropoda, Opisthobranchia) at Bull Island, Dublin, Ireland

Limapontia depressa was present in the saltmarsh pools at Bull Island, Dublin from October to June each year. Numbers peaked in December, with a secondary peak in April, and the maximum density

Population dynamics, biomass and productivity of Limapontia depressa (Gastropoda, Opisthobranchia) at Bull Island, Dublin, Ireland

The low G:P ratio suggests that not all semelparous species necessarily adopt an r-strategy of 'reproductive recklessness', and may be an important link into the wider estuarine trophic system and a vital food resource for small waders.

Salinity adaptations in the gastropodsLittorina mandshurica andLittorina squalida at different stages of ontogenesis

At the time of hatching, the salinity tolerance of larvae differed little, if at all, from that of adults, so it is assumed that pelagic egg capsules provide an advantage in the distribution of a species.

Der Wasserhaushalt der Tiere im Spiegel ihrer ökologischen Geschichte

Theoretische und experimentelle Untersuchungen fiber die Einsatzm6glichkeit of BeO in einem Hochtemperatur-Kugelhaufen-Reaktor werden z.Z. in Jfilich noch durchgeftihrt.



Zur Biologie und Ökologie des Landeinsiedlerkrebses Coenobita scaevola Forskål am Roten Meer

The terrestrial hermit crab Coenobita scaevola is very common on the coast of the Red Sea and carries many inhabitants of marine and terrestrial origin and the avoidance of such traps by arthropodes has never been observed before.

Distribution and ecology of the slugs Alderia modesta and Limapontia depressa in the Netherlands

This paper deals with the slugs Alderia modesta (Loven) and Limapontia depressa Alder & Hancock, both very common in the intertidal zone of the Dutch salt-marshes. Van Benthem Jutting & Engel did not

Aspects of Osmotic Regulation in Crabs Showing the Terrestrial Habit

  • W. J. Gross
  • Environmental Science
    The American Naturalist
  • 1955
The ability to regulate in concentrated sea water (hypo-osmotic regulation) is believed to be a manifestation of a mechanism for the conservation of water, namely, elimination of salts.

Die Littorina-Arten: Kein Modell für die Entstehung der Landschnecken

The Littorina species are no model for the evolution of terrestrial gastropods, their characteristics are merely those of intertidal animals.

Osmo- und Volumenregulation bei Hirudo medicinalis

  • I. Boroffka
  • Chemistry
    Zeitschrift für vergleichende Physiologie
  • 2004
SummaryIn the leech (Hirudo medicinalis) osmo- and volume regulation were studied during and following exposure to solutions of different salinity. 1.In animals kept in tap water blood osmolarity

Rearing experiments on the amphibian slugAlderia modesta

Alderia modesta lives in enormous numbers onVaucheria-cushions near the supralittoral fringe of the European coasts in salinities from 5 to 40 ‰ and contributes considerably to the number of veligers in the plankton; a fact which has hitherto not been realized.

Influence of X-Rays on Limb Regeneration in Urodele Amphibians

  • V. Brunst
  • Biology
    The Quarterly Review of Biology
  • 1950
The purpose of the present review is to survey the basic problems in this field, as enumerated below: the mode of action of x-rays in inhibiting regeneration, and the source of cells for the regenerative blastema.

Elektrolyttransport im Nephridium von Lumbricus terrestris

  • I. Boroffka
  • Physics
    Zeitschrift für vergleichende Physiologie
  • 2004
Zusammenfassung1.Mit Hilfe einer modifizierten Punktionstechnik wurde die Chlorionenkonzentration in verschiedenen Abschnitten des Regenwurmnephridiums bestimmt. Die Chlorionenkonzentration nimmt in


  • G. Thorson
  • Biology
    Biological reviews of the Cambridge Philosophical Society
  • 1950
In analysing the ecological conditions of an animal population, the most sensitive stages within the life cycle of the animal are focused upon, that is, the period of breeding and larval development.