Showing papers in "Journal of Molluscan Studies in 1992"
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TL;DR: Differences in growth size, mortality and reproduction rates were observed between morphs, indicating adaptation to different demographic strategies in the parth-enogenetic snail Melanoides tuberculata.
Abstract: The life history traits of three morphs of the parth-enogenetic snail Melanoides tuberculata were studied under laboratory conditions. Differences in growth size, mortality and reproduction rates were observed between morphs, indicating adaptation to different demographic strategies. These results are discussed in relation to the invasion of the species which occurred in Guadeloupe and Martinique
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TL;DR: The results support Reid's hypothesis of the origin of Atlantic littorines from two Pacific ancestors as well as three groups analysis of genetic identities showed that there were three groups.
Abstract: Four Littorina species from the Pacific (L. sitkana, L. brevicula, L. mandshurica, L. squalida) and four from the Atlantic (L. mariae, L. obtusata, L. saxatilis and L. littorea) were compared electrophoretically using 17 loci. Analysis of genetic identities showed that there were three groups. The first group comprises L. sitkana, L. mariae, L. obtusata and L. saxatilis. The second group consists of L. brevicula and L. mandshurica and the third one includes L. squalida and L. littorea. Our results support Reid's hypothesis of the origin of Atlantic littorines from two Pacific ancestors.
27 citations
TL;DR: The relationship between the two encrusting sponges, Suberite rubrus and Suberites luridus, and the pectinid bivalve mollusc Chlamys opercularis was shown to be a protective-com mensal mutualism.
Abstract: The relationship between the two encrusting sponges, Suberites rubrus (Sole-cava & Thorpe, 1986) and Suberites luridus (Sole-cava & Thorpe, 1986) and the pectinid bivalve mollusc Chlamys opercularis (Linnaeus) was shown to be a protective-com mensal mutualism. The sponge protected the scallop from asteroid predation (Asterias rubens, L.) probably by reducing their tube-feet adhesion and also by excluding the settlement of other taxa likely to hinder the scallop's mobility. The sponge benefited in turn by protection from predation by the nudibranch Archidoris pseudoargus (Pallas) and more generally from transport to favourable locations. Both Asterias and Archidoris were frequently observed moving directly towards their prey, possibly indicating chemotaxic mechanisms. Yet, the sponges did not appear to confer any chemical protection to the scallop from asteroid attack .Similarly the living scallop conferred no chemical protection to the sponge.
25 citations