Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 7 of 7 for “"Veligers"”.
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The escape of veligers from the egg capsules of Nassarius obsoletus and Nassarius trivittatus (gastropoda, prosobranchia)
… (operculum) which must be removed before the veligers can escape. Although the removal of the operculum is generally attributed to embryonic secretion of enzymes, there is little experimental support for this sugsestion. In the limited experiments which have been reported, all dealing with …
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Intensive sampling and comparison of methods in detection of non-indigenous species
… be determined by the presence of their larvae (veligers). I hypothesized that veligers will be detected in the south basin where they were previously reported, but not in the north basin where they were never reported. I also compared detection success as well as the cost and time of three …
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Larval development and feeding ecology of Hermissenda crassicornis (Eschscholtz) and Aeolidia papillosa (Linnaeus)
… Hermissenda crassicornis and Aeolidia papillosa. Veligers of the facelinid, Hermissenda crassicornis and the aeolid, Aeolidia papillosa have striated, Type 1 (coiled) larval shells and fall within Thompson's (1967) definition of planktotrophic larvae. Veligers of both species remain planktonic for …
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Control strategies for the zebra mussel, Dreissena polymorpha, and the Asian clam, Corbicula fluminea: comparative stress responses and nontarget impact
… residual oxidant) upon settling of zebra mussel veligers were examined in studies conducted in a field laboratory on western Lake Erie. Veliger densities in the water column at the field site peaked at 530/L, while mussel densities on settling monitors reached 147,083/m² over the course of the …
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Characteristics of the Unionid Community and Habitat in a Power Plant Thermal Plume in Western Lake Erie
… R2=94.9%; p=0.0003). The ratio of live:dead veligers was significantly higher at the intake than at the outflow on most dates. A laboratory experiment showed that heating to levels experienced by passing through the power plant caused significant mortality in veligers (N=20; p<0.0001). These …
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MICROMORPHOLOGY AND GENE EXPRESSION IN MUSCLE AND SHELL DEVELOPMENT OF THE MOLLUSCA
… complicated set of larval retractor muscles, the veligers of autobranchs (i.e. all Bivalvia except the Protobranchia, the latter with a test-cell larva) exhibit a distinct prototroch muscle ring similar to chitons and gastropods. Both systems are entirely larval and are resorbed during …
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A multidisciplinary study of the Asiatic clam, Corbicula fluminea, from the New River, Virginia
… distinct occasions with peaks in release of veligers in June, August, and October. Percent tissue water content and body condition were monitored monthly in 1985. Significant differences in these parameters were observed among certain months and among size classes. Tissue water content and …