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Showing 1 to 20 of 79 for “"Gastropods"”.
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Cretaceous Nerineacean gastropods
The Nerineacea form a distinctive and significant component of shallow marine Mesozoic Tethyan macrofaunas. They occur in shelf sediments deposited in tropical regions during the Jurassic and Cretaceous. The group first appears in the early Jurassic and high diversity levels had developed by late …
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PROTEIN PURIFICATION FROM GASTROPODS
Gastropods are a class of invertebrates within the mollusks, commonly known as snails and slugs. Recently, scientific interest is directed on snails as pollution indicators, as destroyers of crops, but also as parasites carriers. Furthermore, some species of snails are considered as an important …
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Investigation of the cytogenetics of marine and terrestrial gastropods
The investigation of the chromosomal variation in populations of the land snail Cepaea nemoralis (L.) marine snail Nucella lapillus (L.) is presented. The first study (Part 1) concerns the investigation of the karyotype of C. nemoralis in populations from a region of the Berkshire Downs (U.K.)in …
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Some Aspects of the Morphology and Relationships of Volutacean Gastropods
The Neogastropoda is a particularly large and conspicuous group containing several important families. The group is, with a few exceptions, carnivorous, and it is the alimentary canal that shows the most interesting modifications. The morphology of several of these families is practically unknonw …
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Aromatic alcohol oxidase, aldehyde oxidase and mannitol oxidase in terrestrial gastropods
Several unusual hydrogen peroxide generating oxidase activities have been investigated in the alimentary tissues of terrestrial gastropod molluscs. A membrane-bound aromatic alcohol oxidase activity has been demonstrated in the digestive gland (hepatopancreas) of four families of gastropod …
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A computer aided palaeoecological study of selected Red Crag (Lower Pleistocene) gastropods
… Naticidae and Turritellidae families of gastropods from the Red Crag (Lower Pleistocene), with particular reference to interactive fauna. The Red Crag is a fully marine deposit and contains large numbers of molluscan fossils. The methods of study include much use of the computer as a tool …
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Living costs of ocean acidification and warming in herbivorous gastropods and their adaptations
… and their potential adaptations. Herbivorous gastropods from intertidal to subtidal zones were chosen as the study animals in view of their substantial contribution to herbivory in their habitat. Ocean acidification and warming can raise the energy demand of marine organisms, impacting their …
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The Gastropods of The Late Cretaceous Ripley, Owl Creek, and Prairie Bluff Formations
Made available in DSpace on 2014-12-04T19:13:28Z (GMT). No. of bitstreams: 1 0010549.pdf: 28818227 bytes, checksum: e7f84879b5b449a70a5f0fdcb8107b16 (MD5) Previous issue date: 1954
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A study of the pelagic gastropods of the Dillon Beach area pteropods and heteropods
… material for the present study.</p><p>Pelagic gastropods were present in every tow in varying numbers and species. Two groups, pteropods and heteropods, were found in the samples. One species of pteropod, Limacina helicina, was the dominant member in all of the tows and occurred during the …
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Prey Selectivity by naticid gastropods from tertiary sediments of the United States coastal Plain
… focuses on prey selectivity by Oligocene naticid gastropods and is used to test Vermeij's (1987) hypothesis of escalation. The hypothesis of escalation states that biologic hazards have increased during the Phanerozoic and that organisms have either had to adapt to these hazards or face possible …
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Gastropods in lower Snake River and three of its tributaries and the effects of competition with the New Zealand mud snails (Potamopyrgus antipodarum)
… if this invasive snail is competing with native gastropods. Potamopyrgus antipodarum is a successful invader in much of the Western United States and has been shown to impact nutrient cycling and community structure in invaded ecosystems. This study is divided into two chapters: the first chapter …
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Holocene Mollusks of the Knife and Heart Rivers, Southwestern North Dakota
… in addition to 11 species of fossil terrestrial gastropods. From 18 collecting sites in the Heart River, southwestern North Dakota, at least 18 species of aquatic mollusks are presently living. From 6 fossil sites on this river, at least 10 species of aquatic mollusks were found in addition to 4 …
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Exploring Eastern Musk Turtle (Sternotherus odoratus) Population Dynamics and Phenotypic Plasticity in Comal Springs, Texas
… spring systems in Central Texas, where invasive gastropods have become abundant. This study investigates whether dietary shifts toward these gastropods are associated with variations in head and body morphology. Seventy-one individuals were captured in June and July 2024. Morphometric data and …
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Hitching a ride: A gastropod-associated microbiome community at a Hydrate Ride methane seep and impacts on local biogeochemical cycling
… microbial communities associated with provannid gastropods as characterized using 16S rRNA gene amplicon and clone libraries as well as Fluorescence In Situ Hybridization. The gastropod shells, collected from seeps at Hydrate Ridge and the Gulf of Mexico are covered with filamentous epibionts on …
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Composition, Biomass, and Protein Content of a Lemna trisulca L., Invertebrate Community in a Prairie Wetland
… wetland during the summer 1981. Amphipods and gastropods were the dominant macroinvertebrates found within samples of duckweed in terms of biomass and density. Cladocera were the dominant microinvertebrates found in association with star duckweed. Significant variability was found in the …
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It’s clam-plicated: how functional traits influenced extinction patterns of Neogene West Atlantic mollusks
… to focus conservation efforts. Bivalves and gastropods from the West Atlantic (WA) during the Plio-Pleistocene are a well-studied and well-preserved group in the fossil record, and many species from this time period are extant. The periods of global warming during the Plio-Pleistocene can be …
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Composição, distribuição espaço - temporal e associações de espécies de Gastropoda do infralitoral de fundos inconsolidados da região do Cabo Frio, RJ, Brasil
… sand moderately well sorted. Were collected 915 gastropods of 56 species, recording a new occurrence to the Brazilian coast. A seasonal pattern was not observed in the distribution of the organisms, however a progressive increase of the number of individuals occurred from 1986 to 1988, suggesting …
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Moluscos encontrados no Sambaqui de Camboinhas, Itaipu, Niterói, Estado do Rio de Janeiro, Brasil
… on the site are three species of marine gastropods, one of terrestrial gastropod, and ten of marine bivalves.
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Spatial and temporal variations in rocky intertidal communities
… in the populations of certain abundant algae and gastropods at Dalebrook.
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