PLEOPODAL EGG PRODUCTION OF THE WHITE-CLAWED CRAYFISH AUSTROPOTAMOBIUS PALLIPES LEREBOULLET UNDER LABORATORY CONDITIONS: RELATIONSHIP BETWEEN EGG NUMBER, EGG DIAMETER AND FEMALE SIZE
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چکیده
منابع مشابه
The 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 کاملRevisiting the positive correlation between female size and egg size
Positive correlations between maternal size and propagule (egg, seed, embryo) size could arise for several reasons. One of these is that larger mothers may improve the survival of their offspring during a stage when large propagules typically have lower survival than small propagules. We previously developed an optimality model that incorporated this effect and used it to explain the positive c...
متن کاملTotal 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 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...
متن کاملThe relationship between female body size and egg size in pipefishes.
Comparing five species of pipefish, egg size was significantly larger in species with brood pouches (Syngnathus typhle, Syngnathus acus and Syngnathus rostellatus) than in species without brood pouches (Entelurus aequoreus and Nerophis ophidion). Egg size correlated positively with female body size in species with brood pouches, but was similar across female sizes in the species lacking pouches...
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ژورنال
عنوان ژورنال: Bulletin Français de la Pêche et de la Pisciculture
سال: 2006
ISSN: 0767-2861
DOI: 10.1051/kmae/20061207