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The behaviour of migratory eels,Anguilla rostrata, in response to current, salinity and lunar period
Springer Science and Business Media LLC - Tập 27 - Trang 211-233 - 1975
1. Behaviour of migratory silver eels and immature yellow eels,Anguilla rostrata, was studied in a choice-chamber apparatus. 2. Silver eels display a negative rheotaxis in both well water and natural stream water. 3. Silver eels reversed the sign of their response, to a positive rheotaxis, when salt water was introduced into the tank. 4. Rheotaxis and the salinity response are proposed as an effec...... hiện toàn bộ
Physiological and biochemical changes during the larval development of a brachyuran crab reared under constant conditions in the laboratory
Springer Science and Business Media LLC - - 1989
Larvae of the spider crabHyas araneus were reared in the laboratory at constant conditions (12°C; 32‰S), and their feeding rate (F), oxygen consumption (R), nitrogen excretion (U), and growth were measured in regular intervals of time during development from hatching to metamorphosis. Growth was measured as dry weight (W), carbon (C), nitrogen (N), hydrogen (H) protein, and lipid. All these physio...... hiện toàn bộ
Die Dynamik der Frühentwicklung vonSagitta setosa
Springer Science and Business Media LLC - Tập 12 - Trang 260-301 - 1965
1. Untersuchungsobjekt.Sagitta setosa
Joh. Müll. Vergleichsobjekt:Sagitta elegans arctica
Aurv. Methoden: Laufbild- und Teilbildanalyse von Mikrozeitrafferfilmen; kinematische Diagramme. 2. Unter Zeittransformation (Zeitraffung, Z.R.) wird eine Ausdehnung des Keimes während der Teilungsphase, gefolgt von einer Kontraktion in der Interphase, im Z.R.-Laufbild erkennbar. Dieser Rhythmus ist etwa vom ...... hiện toàn bộ
The rough tingleOcenebra erinacea (Neogastropoda: muricidae): An exhibitor of imposex in comparison toNucella lapillus
Springer Science and Business Media LLC - Tập 46 - Trang 311-328 - 1992
The muricid gastropodOcenebra erinacea exhibits imposex (occurrence of male parts in addition to the female genital duct), a phenomenon which is caused by tributyltin (TBT)-compounds leached from ships’ antifouling paints. Five stages of imposex development (1–5) with two different types at stage 1 can be distinguished and are documented with SEM-photographs for the first time. Four additional alt...... hiện toàn bộ
Extended hatching periods in the subantarctic lithodid crabs Lithodes santolla and Paralomis granulosa (Crustacea: Decapoda: Lithodidae)
Springer Science and Business Media LLC - Tập 57 - Trang 110-113 - 2003
Temporal pattern of hatching was studied in the subantarctic lithodid crabs Lithodes santolla (Molina) and Paralomis granulosa (Jaquinot) from the Argentine Beagle Channel. In both species, larval hatching occurred in low daily numbers over an extended period of up to several weeks, depending on hatch size. Low daily hatching activity and low oxygen-consumption rates in freshly hatched P. granulos...... hiện toàn bộ
Guest research facilities at the Biologische Anstalt Helgoland: Past and present
Springer Science and Business Media LLC - Tập 49 - Trang 243-254 - 1995
The Biologische Anstalt Helgoland (BAH) offers unique possibilities for research and education in marine sciences in the southern part of the North Sea. Besides its own research duties, the Institute provides research facilities and technical assistance for guest scientists, assists in the teaching and education of university student groups, and conducts its own courses. The Institute further supp...... hiện toàn bộ
Beitrag zur quantitativen Verteilung mariner und „terrestrischer“ Bakterien im Wasser und in Sedimenten der Deutschen Bucht
Springer Science and Business Media LLC - Tập 15 - Trang 226-242 - 1967
1. Mit Hilfe von drei verschiedenen Kulturmedien wurden die Dichten heterotropher Bakterien im Wasser und in der oberen Schicht der Bodensedimente auf acht Stationen in der südlichen Nordsee bestimmt. 2. Mit Meerwassermedium wurden im freien Wasser 150 bis 15 000 Bakterien/ml, in den Sedimenten 6000 bis 6 500 000 entwicklungsfähige Bakterien/cm3 ermittelt. Die geringste Bakteriendichte in den Sedi...... hiện toàn bộ
Effect of the surfactant Corexit 7664 on uptake of cadmium by organisms and biological matter in a closed circulated brackish-water system
Springer Science and Business Media LLC - Tập 35 - Trang 1-12 - 1982
Juvenile flounder and common mussel from the Baltic Sea were kept in Corexit 7664 (50 µg/l) and cadmium (5 µg/l)-contaminated, recirculated, sea-water systems for 200 days at 15 °C and 20 ‰ S. Accumulation of cadmium with exposure time was measured in several fish tissues and in mussel. There were no differences in the cadmium accumulation by tissues with or without the addition of Corexit 7664. N...... hiện toàn bộ
Shedding light on the larval genus Eretmocaris: morphological larval features of two closely related trans-isthmian Lysmata species (Decapoda: Caridea: Hippolytidae) described on the basis of laboratory cultured material
Springer Science and Business Media LLC - Tập 66 - Trang 97-115 - 2011
Complete larval series are known for only three of the 39 valid species worldwide in the genus Lysmata. The present work deals with the larval development of two closely related trans-isthmian species of Lysmata, L. galapagensis (eastern Pacific Ocean), and L. moorei (southwestern Atlantic Ocean), using laboratory cultured material. The morphological features of the first four zoeal stages of both...... hiện toàn bộ
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