MORPHOLOGICAL VARIATIONS IN ASTACUS ASTACUS L. AND AUSTROPOTAMOBIUS PALLIPES (LEREBOULLET) POPULATIONS
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چکیده
منابع مشابه
Total body calcium and haemolymph calcium concentrations in the crayfish Austropotamobius pallipes (Lereboullet).
Variations in the concentration of calcium in the haemolymph and of total body calcium in Austropotamobius pallipes have been investigated. Haemolymph calcium concentration was independent of both body size and sex. During premoult the calcium concentration of the haemolymph rose from 11-8 ITIM/1 to 15-0 HIM/I. After the moult the calcium concentration remained high during stages A and B but de...
متن کاملRespiration in relation to ion uptake in the crayfish Austropotamobius pallipes (Lereboullet).
1. O2 uptake was determined for periods of 23-46 h in salt-depleted crayfish held in deionized water (DW) or Na-free media at 10 degrees C. These media were replaced by artificial lakewater media (ALW) containing 0-2-0-6 mM Na and O2 uptake was again determined for periods of 24-66 h. 2. During net ion uptake in ALW the metabolic rate was either elevated or depressed. Standard metabolism in ALW...
متن کاملThe electrical potential difference across the epithelium of isolated gills of the crayfish Austropotamobius pallipes (Lereboullet).
There has been a considerable amount of work on the electrical potential differences and active transport processes of ions across various vertebrate epithelia (Ussing, i960). Little work of this type has been attempted on invertebrate material. As the crustacean gill epithelium has only a single layer of cells separating the body fluid and the external medium, it should be particularly suitabl...
متن کاملSerotonin alters decisions to withdraw in ®ghting cray®sh, Astacus astacus : the motivational concept revisited
The biogenic amine serotonin is thought to play an important role in aggression in many species, including man. This paper summarizes experimental approaches which attempt to link this neuromodulator with ®ghting in a cray®sh model for which the complex agonistic behavior is well characterized. Based on a quantitative analysis of ®ghting we demonstrate that the infusion of small amounts of sero...
متن کاملCalcium balance at the postmoult stage of the freshwater crayfish Austropotamobius pallipes (Lereboullet).
Net uptake of calcium by Austropotamobius begins 15-30 min after the moult and rapidly reaches a maximum level (2 /imoles/g/h at io°C) which is maintained throughout stages A and B. At stage Cx the rate of net uptake falls sharply to a lower level which is gradually reduced until equilibrium is reached at C4. The uptake mechanism is near-saturated at 0-4 mM-Ca/1 and half-saturated at 0-13 mM-Ca...
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ژورنال
عنوان ژورنال: Bulletin Français de la Pêche et de la Pisciculture
سال: 2005
ISSN: 0767-2861
DOI: 10.1051/kmae:2005021