The Larval Stages of Nassarius reticulatus and Nassarius incrassatus
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The Escape of Veligers from the Egg Capsules of Nassarius Obsoletus and Nassarius Trivittatus (gastropoda, Prosobranchia).
1. The loosening of the egg capsule plug prior to escape of the veligers is shown to be chemically mediated in Nassarius obsoletus and N. trivittatus. 2. The hatching substance is not produced continuously during development, but rather in a short pulse beginning just prior to hatching and ending within 4 hours of escaping from the capsule, for N. obsoletus. 3. The hatching substance produced b...
متن کاملCrystallinity and microchemistry of Nassarius reticulatus (Caenogastropoda) statoliths: towards their structure stability and homogeneity.
Gastropod statoliths are spherical biocarbonates formed during their lifespan. The stability and homogeneity of these structures' mineral matrix was characterised along their radiuses, using Nassarius reticulatus as a model. Generally, they were proved to be bimineralic. Two of the three CaCO3 crystalline polymorphs occurring in biocarbonates - aragonite and calcite - coexist along statolith ra...
متن کاملInvolvement of Retinoid X Receptor in Imposex Development in Nucella lapillus and Nassarius reticulatus—Preliminary Results
The imposex phenomenon provides one of the best examples of endocrine disruption in wildlife and has been studied for about four decades. However, the exact biochemical mechanism by which it develops is still unclear. Several pathways have been proposed: neuroendocrine, steroid and retinoic. In the present work the possible role of retinoid X receptor (RXR) in the development of imposex in Nuce...
متن کاملGenetic isolation by distance among populations of the netted dog whelk Nassarius reticulatus (L.) along the European Atlantic coastline.
Estimates of the average distances by which marine larvae disperse are generally poorly described, despite the central role that larval dispersal plays in the demographic connectivity of populations across geographic space. Here, we describe the population genetic structure and average dispersal distance of the netted dog whelk Nassarius reticulatus (L.) (Mollusca, Gastropoda, Prosobranchia), a...
متن کاملCan Nassarius reticulatus be used as a bioindicator for Hg contamination? Results from a longitudinal study of the Portuguese coastline.
The focus of this work is to explore the use of the netted whelk, Nassarius reticulatus (L.), as an indicator of mercury (Hg) contamination, by assessing the concentration of Hg in the sediments and in the whelk along the entire Portuguese coast. Total Hg concentrations ranged from below the detection limit (0.01 ng absolute mercury) up to 0.87 mg kg(-1) dry weight (dwt) in sediments and betwee...
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ژورنال
عنوان ژورنال: Journal of the Marine Biological Association of the United Kingdom
سال: 1931
ISSN: 0025-3154,1469-7769
DOI: 10.1017/s0025315400051985