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Letteratura scientifica selezionata sul tema "Snails"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 29 luglio 2024

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Articoli di riviste sul tema "Snails"

Ademolu, K. O., A. B. Idowu e O. A. Jayeola. "Changes in Haemolymph Biochemical values during different growth phases in African Giant Land Snail (Archachatina Marginata) Swainson". Nigerian Journal of Animal Production 36, n. 1 (1 gennaio 2021): 161–66. http://dx.doi.org/10.51791/njap.v36i1.1200.

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The impact of growth phases on the haemolympy biochemical value of African giant land snail Archachatina marginata was studied. The growth phases were: snailet, juvenile and Adult based on the number of whorls on the shell and weight of the snails. Highest concentration of glucose and lipids were recorded at the juvenile phase (40.20mg/dl), while least values for glucose (20.00mg/dl) and lipids (37.80mg/dl)were recorded during snailer and adult phases respectively. A progressive increase in the concentration of protein was observed as the snails moved from snailetphase to adult phase, hence snails in adult phase had highest concentration of protein in their haemolymph. Growth phases significantly (p<0.05) affected the haemolymph mineral composition of the snails, juvenile phase had the highest values in ca2+,PO4+ and Na+, while the adult phase recorded the least concentration in ca2+, Na amd cl-2. Juvenile growth phase of A. marginata thus has better haemolymph biochemical values than both snailet and adult growth phases.

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Ito, Shun, e Junji Konuma. "Disruptive selection of shell colour in land snails: a mark–recapture study of Euhadra peliomphala simodae". Biological Journal of the Linnean Society 129, n. 2 (3 dicembre 2019): 323–33. http://dx.doi.org/10.1093/biolinnean/blz168.

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Abstract Many theoretical studies have suggested that disruptive selection plays an important role in phenotypic divergence, but few studies have determined the action of disruptive selection on phenotypic divergence via field studies. This study investigated the effect of disruptive selection on shell colour polymorphism in the Japanese land snail Euhadra peliomphala simodae to determine whether extreme phenotypes of snail shell colour are favoured over intermediate phenotypes. We conducted field surveys on an oceanic island with black, yellow and intermediate-coloured E. p. simodae snails. We captured and marked ~1800 individual snails and monitored their survival over 18 months. We quantified shell colours against images and examined the frequency distribution of shell colour variation. The variation exhibited a bimodal distribution with a far lower frequency of intermediate-coloured snails than of black or yellow snails. The population sizes of the three snail groups fluctuated synchronously with the changing seasons. Bayesian estimates showed lower survival rates for juvenile intermediate-coloured snails than for juvenile black and yellow snails, implying there was disruptive selection associated with shell colour. We suggest this disruptive selection may have resulted in the evolutionary divergence of the snail’s shell colour within the lineage having high shell colour variation.

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Zayed, Khaled M., Yun-Hai Guo, Shan Lv, Yi Zhang e Xiao-Nong Zhou. "Molluscicidal and antioxidant activities of silver nanoparticles on the multi-species of snail intermediate hosts of schistosomiasis". PLOS Neglected Tropical Diseases 16, n. 10 (10 ottobre 2022): e0010667. http://dx.doi.org/10.1371/journal.pntd.0010667.

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Background Schistosomiasis, also known as bilharzia, is the second important parasitic disease after malaria. The present study aimed to evaluate the molluscicidal effects of silver nanoparticles on Biomphalaria alexandrina, B. glabrata, Oncomelania hupensis, snail intermediate hosts of intestinal schistosomes (i.e. Schistosoma mansoni and S. japonicum), along with the changes their antioxidant enzymes. Methods Silver (Ag) nano powder (Ag-NPs) was selected to test the molluscicidal effects on three species of freshwater snails. Exposure to Ag-NPs induced snail mortality and the LC50 and LC90 values of Ag-NPs for each snail species were calculated by probit analysis. Control snails were maintained under the same experimental conditions in dechlorinated water. Snail hemolymph was collected to measure the levels of antioxidant enzymes, such as total antioxidants capacity (TCA), glutathione (GSH), catalase (CAT) and nitric oxide (NO). In addition, the non-target organism, Daphnia magna, was exposed to a series of Ag-NPs concentration, similar to the group of experimental snails, in order to evaluate the LC50 and LC90 and compare these values to those obtained for the targeted snails. Results The results indicated that Ag-NPs had a molluscicidal effect on tested snails with the variation in lethal concentration. The LC50 values of Ag-NPs for B. alexandrina snails exposed for 24, 48, 72 hrs and 7 days were 7.91, 5.69, 3.83 and 1.91 parts per million (ppm), respectively. The LC50 values for B. glabrata snails exposed for 24, 48, 72 hrs and 7 days were 16.55, 10.44, 6.91 and 4.13 ppm, respectively, while the LC50 values for O. hupensis snails exposed for 24, 48, 72 hrs and 7 days were 46.5, 29.85, 24.49 and 9.62 ppm, respectively. Moreover, there is no mortality detected on D. magna when exposed to more than double and half concentration (50 ppm) of Ag-NPs during a continuous period of 3 hrs, whereas the LC90 value for B. alexandrina snails was 18 ppm. The molluscicidal effect of the synthesized Ag-NPs seems to be linked to a potential reduction of the antioxidant activity in the snail’s hemolymph. Conclusions Synthesized Ag-NPs have a clear molluscicidal effect against various snail intermediate hosts of intestinal schistosome parasites and could potentially serve as next generation molluscicides.

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Napoli, Ettore, Alessandra Sfacteria, Claudia Rifici, Giuseppe Mazzullo, Gabriella Gaglio e Emanuele Brianti. "Reaction of Cornu aspersum Immune System against Different Aelurostrongylus abstrusus Developmental Stages". Pathogens 12, n. 4 (31 marzo 2023): 542. http://dx.doi.org/10.3390/pathogens12040542.

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Cornu aspersum, the land snail, is recognized as a suitable intermediate host of Aelurostrongylus abstrusus; however, there is little information both on larval development as well as on the intermediate host’s immune system reaction to the parasite. The aim of the study was to assess the histological reaction of C. aspersum’s immune system against A. abstrusus. Sixty-five snails were provided by a snail farm. Five of them were digested to assess the absence of natural parasitic infections. The remaining sixty were divided into five groups. Three groups of snails were infected with A. abstrusus using by-contact or injection methods; one group was injected only with saline solution and one group was left untreated as the control. The snails of group A were sacrificed and digested on study days 2, 10, and 18; snails of the other groups were collected and examined for histopathological analysis on study days 2, 10, and 18. On study day 2, in the infected snails, several free L1s were observed along with the absence of immune system reactions. On day 10, the L2s elicited an intense reaction in the internal layer of the muscular foot. On day 18, all L3s partially encapsulated by the snail’s immune system were observed in the outermost part of the muscular foot, which is near and among the goblet cells. This last finding suggests that L3s could be shed with the snail’s mucus and spread in the environment, representing an alternative route of transmission for this feline lungworm.

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Hoso, Masaki, Takahiro Asami e Michio Hori. "Right-handed snakes: convergent evolution of asymmetry for functional specialization". Biology Letters 3, n. 2 (13 febbraio 2007): 169–73. http://dx.doi.org/10.1098/rsbl.2006.0600.

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External asymmetry found in diverse animals bears critical functions to fulfil ecological requirements. Some snail-eating arthropods exhibit directional asymmetry in their feeding apparatus for foraging efficiency because dextral (clockwise) species are overwhelmingly predominant in snails. Here, we show convergence of directional asymmetry in the dentition of snail-eating vertebrates. We found that snakes in the subfamily Pareatinae, except for non-snail-eating specialists, have more teeth on the right mandible than the left. In feeding experiments, a snail-eating specialist Pareas iwasakii completed extracting a dextral soft body faster with fewer mandible retractions than a sinistral body. The snakes failed in holding and dropped sinistral snails more often owing to behavioural asymmetry when striking. Our results demonstrate that symmetry break in dentition is a key innovation that has opened a unique ecological niche for snake predators.

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Weck, Robert G. "Life history observations of the Illinois state endangered Enigmatic Cavesnail, Fontigens antroecetes (Hubricht, 1940) made under simulated cave conditions". Subterranean Biology 43 (3 agosto 2022): 185–98. http://dx.doi.org/10.3897/subtbiol.43.87277.

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The Enigmatic Cavesnail, Fontigens antroecetes (Hubricht, 1940), is a cave adapted hydrobioid snail listed as state endangered in Illinois. It is known from only one cave in Illinois, Stemler Cave, and from several caves in the eastern Ozark ecoregion of Missouri. Little is known about the snail’s reproductive habits, embryological development, or growth rates. I attempted to gain basic life history information by breeding Enigmatic Cavesnails under simulated cave conditions in the laboratory. Six adult snails were collected from Stemler Cave and held in aerated containers of cave water with one or two cobbles from the cave stream. Containers of snails were housed in incubators set at the average cave water temperature of 13 °C. The snails produced 49 embryos in captivity over the course of 34 weeks. Eggs were deposited singly, attached to the underside of rocks within small pits or crevices. Nearly 82% of embryos developed to hatching. Mean estimated development time of embryos was 70.7 days. Survival of hatchling snails was poor. Limited data available from surviving hatchling snails suggests slow growth rates. The process was replicated with nine Enigmatic Cavesnails collected from Cliff Cave in St. Louis County MO. Captive Cliff Cave snails produced 34 embryos over 46 weeks and varied from the Stemler population in their oviposition behavior, with a majority of eggs deposited on the top surface of rocks. Cliff Cave snail embryos also had longer mean estimated development times (82.17 days).

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Götz, Matthias. "The feeding behavior of the snail-eating snake Pareas carinatus Wagler 1830 (Squamata: Colubridae)". Amphibia-Reptilia 23, n. 4 (2002): 487–93. http://dx.doi.org/10.1163/15685380260462383.

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AbstractThe behavior of captive Pareas carinatus feeding on European round-shelled snails is described. The snake bites into the snail's body and lifts it from the ground. With alternate retraction movements of the mandibles, it pulls the body out of the shell while the upper jaw rests on the outside of the shell. There are only slight differences to dipsadine snakes: Pareas never followed a mucus track and did not coil around the snail's shell. There seemed to be a preference to catch the snails from behind. Extraction time (24-390 s) and number of mandibular movements (22-98) were similar to the data on the dipsadines.

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Dragicevic, Olgica, e Milan Baltic. "Snail meat: Significance and consumption". Veterinarski glasnik 59, n. 3-4 (2005): 463–74. http://dx.doi.org/10.2298/vetgl0504463d.

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The consumption of snail meat goes back to prehistoric times. Different ancient nations had snails on their menu, but Helices culture as a productive activity was born as a Roman culture. Some of the most economically important edible species are: Helix aspersa (Mtiller) Helixpomatia (Linne), Helix iucorum (Linne), Helix aperta (Born), Eobania vermiculata (Miiller). Together with its tasie, snail meat has several advantages over others: quite low lipid rate and calorie values versus rich mineral, essential amino acid and fatty acid content. The composition of snail meat is presented. In addition, the composition of different snail species and the part analyzed (pedal mass and visceral mass) is presented. Also, the differences in composition according to the species (snail meat horse/chicken meat, beef, swine meat, fish meat) are presented. The French are the world's leading consumers of snails. !n France snails come to market in a variety of ways. Estimated consumption of snails in France is around 40 000 tones/year. Total French imports account for 25% of world imports. France is also the leading exporter of prepared snails, mainly sold as preserved snails and prepared dishes. Snail imports have been much higher than exports (65 tones exported in 2002. vs. 2.700 tones imported). Despite the large consumption, only 3% of snails in France come from production (farming). Italy is in second place in the world consumption of snails, and Spain and Germany are in the third and fourth place. The development of snails consumption in Italy is followed with the same amount of production of snails in the whole biological circle. In 2001, from 24,700 tons, 9,350 tons (37.8%) came from production, 6 00 tons (2.4%) came from nature, and 14,750 tons (59.70%) came from imports (frozen, fresh and prepared snails). In Serbia, at the beginning of 2005, we had over 400 registered farms for snail production.

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Danilova, I. S. "Study of toxicness of snails meat on biological model". Scientific Messenger of LNU of Veterinary Medicine and Biotechnologies 21, n. 94 (30 luglio 2019): 57–60. http://dx.doi.org/10.32718/nvlvet9410.

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Snails can be found in any part of the planet. They belong to the class of gastropods, which includes terrestrial, freshwater, marine snails. Their ancestors are some of the most ancient species of the fauna. Archaeologists say that the first lived on our planet 500 million years ago. There are about 90000 species of snails, but only 3 species have gained worldwide fame: gigantic African snail, grape and Helix аspersa. Snail’s meat improves bowel function and normalizes metabolism. It is believed that due to the content of magnesium, snail meat has calming effect on humans and helps to fight stress. To determine the level of toxicity of food snails meat on a biological model. Helix pomatia snails were collected in wet weather, after rain or in the morning, Helix aspersa maxima and Helix aspersa muller were recieved from the farm “SNAIL 2016” (Ukraine). As a model we used white mise. To determine the toxicity, the sampled meat preparation has been conducted. For this purpose an average sample of meat of each snail types of 10.0 g, carefully chopped. The milled sample of 5.0 g was introduced into a sterile glass, poured 50.0 cm3 of distilled water, stirred and filtered. There were formed experimental 6 and 2 control groups of mice were formed by six in each one, of 2 months of age (body weight 20 g). Subsequently, prepared samples of snails meat were injected into the mice stomach through a probe every day for 3 days by 0.5 cm3. As a probe, a thin, single-use micropipette was used. The white mice of each group experimental of all groups were placed in isolated cages and clinically monitored for five days. The mice didn’t recieved food, animals had free access to water. Mice of the control groups had free access to food. The meat of each type of snails in the experiments was used both fresh and after 7 days storage refrigerator at a temperature of 4 °С. It was found that filtrates from fresh meat of the three types of food snails Helix aspersa maxima, Helix aspersa muller and Helix pomatia were non-toxic, for the mice of I, II and III groups. We have noticed that the meat that was stored for 7 days in the refrigerator at a temperature of 4 °C was toxic. Mice of the V–VII groups that were fed such meat had a depressed state, muscle tremor, they refused of water and died on 2nd and 3rd days. The mise of control groups (IV and VIII) remained during all experience remained living. This work can be used as a method for determining the toxicity of snail’s meat. It is technologically simple, it requires only laboratory animals, namely white mice, does not require special equipment. Only 3 days can get the result. The method can be used in the work of scientific-experimental, production and regional laboratories of veterinary medicine.

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Syukur, Djunaedil, e Christine Christine. "Faktor Lingkungan Fisik yang Berhubungan dengan Karakteristik Onchomelania hupensis linduensis Vektor Schistosomiasis di Kecamatan Lindu". Banua: Jurnal Kesehatan Lingkungan 2, n. 1 (30 giugno 2022): 23–30. http://dx.doi.org/10.33860/bjkl.v2i1.498.

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Background: Lindu Plateau is surrounded by mountains and protected forests and there is a lake that is the source of community life and habitat for Oncomelania hupensis linduensis (OHL), an intermediate host for schistosomiasis. Purpose: To determine the relationship between environmental temperature, air humidity, turbidity and water pH with density, physical/morphological characteristics and the presence of parasites in OHL snails in active focus areas in Lindu District. Method: Analytical research with an observational survey approach, in Lindu District from May to October 2019. The population was OHL snails in Lindu District, sampled by accidental sampling in 5 research locations, namely Tomado, Langko, Anca, Puroo and Oluu villages. Result: Chi-square test with α=0.05 on environmental temperature and OHL snail density p-value=0.447, ambient temperature and OHL snail external morphology p-value=0.04, temperature and presence of cercariae parasites on OHL snails p -value=0.004; humidity and density of OHL snails p-value=0.193, humidity and external morphology of OHL snails p-value=0.17, humidity and presence of cercariae parasites in OHL snails p-value=0.175; water turbidity and OHL snail density p-value=1,000, water turbidity and OHL snail external morphology of OHL snails p-value=0,070, water turbidity and presence of parasites on OHL snails p-value=0,000; pH of Water and OHL snail density p-value=0,328, pH of water and external morphology of OHL snails p-value=0,017, pH of water with the presence of parasites on OHL snail p-value=0,430. Conclusion: Environmental temperature was related to external morphological characteristics and the presence of parasites in OHL snails, water turbidity related to the presence of parasites in OHL snails, water pH related to external morphological characteristics of OHL in the active focus areas. The government is advised to disseminate information about the active focus areas of OHL snails to prevent schistosomiasis infection in the community.

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Più fonti

Tesi sul tema "Snails"

Clark, Stephanie A. "Systematics, spatial analysis and conservation genetics of Meridolum corneovirens (Pfeiffer, 1851) and related forms (Gastropoda: Camaenidae) from the Sydney region of Australia". Thesis, View thesis, 2005. http://handle.uws.edu.au:8081/1959.7/640.

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The purpose of the present study is to examine the genetic and morphological variation found in narrow-range endemic terrestrial invertebrate species at different geographic scales, and the ramifications of this for their systematics, management and conservation. The listed endangered land snail Meridolum corneovirens and several related forms are restricted to the Sydney region, and were used to address the above issues. Morphological, anatomical, allozyme and DNA data were obtained for a total of 77 populations from across the known range of Meridolum. A particular emphasis was placed on the forms found across the Sydney region. The analysis of the different datasets, both individually and in combination indicate at least 35 taxa mostly parapatric and seven genera were represented. This includes several previously unrecognised taxa. The analysis supports the conclusion that Meridolum corneovirens belongs to a new genus. This includes several species found from eastern Sydney south along the coast to Nowra. A total of six new species and five new genera are described. The conservation and management of narrow-range endemics such as Meridolum corneovirens provide a number of challenges to conservation managers. The alternative of listing a gene pool rather than listing species separately is proposed and explore

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Clark, S. A. (Stephanie Ann), University of Western Sydney, of Science Technology and Environment College e of Science Food and Horticulture School. "Systematics, spatial analysis and conservation genetics of Meridolum corneovirens (Pfeiffer, 1851) and related forms (Gastropoda: Camaenidae) from the Sydney region of Australia". THESIS_CSTE_SFH_Clark_S.xml, 2005. http://handle.uws.edu.au:8081/1959.7/640.

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Ho, Wai-hoong. "The taxonomy and ecology of land snails in Hong Kong, with particular reference to factors affecting their distribution and population dynamics /". Hong Kong : University of Hong Kong, 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20667012.

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Montano-Rendon, Mauricio. "Phylogeography of littorinid snails". Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/13328/.

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Interactions between evolutionary forces such as natural selection, genetic drift and gene flow are complex. Natural selection can lead to parallel formation of phenotypes under similar environmental conditions. Phylogenetic relationships can be inferred from the accumulation of genetic variation caused by genetic drift, regardless of phenotypes. Gene flow between populations can sometimes facilitate the formation of species by natural selection. In this thesis, two groups of marine snails in the diverse subfamily Littorininae were studied. The three rocky-shore species Littorina saxatilis, Littorina arcana and Littorina compressa form one such group, whereas the two sister-species Littoraria cingulata and Littoraria filosa form the other group. Previous studies of the L. saxatilis complex have shown high levels of phenotypic and genetic diversity both at local and broader scales. Previous studies of L. cingulata and L. filosa have found some of the typical signatures of reinforcement. Chapters II and III focused on analysing morphological and genetic variation, respectively, within and among species in the Littorina saxatilis complex from the British Isles. Geometric morphometrics analyses revealed a diversity of shell shape among species, but especially so within L. saxatilis. Shell shape was better explained by environment rather than by geography. Molecular data obtained by high-throughput targeted capture showed the opposite pattern, i.e. genetic variation showed a strong phylogeographic pattern. Chapter IV focused on testing whether reinforcement had contributed towards speciation between Littoraria cingulata and Littoraria filosa. Approximate Bayesian computation analysis supported absence of gene flow between the species in sympatry, suggesting that reinforcement did not contribute towards speciation. However, the results need to be validated and more complex models tested. This thesis highlights the relevance of marine snails in the subfamily Littorininae as model species for addressing a wide range of evolutionary questions. It also provides a wealth of data for many potential follow-up studies.

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Clark, Stephanie A. "Systematics, spatial analysis and conservation genetics of Meridolum corneovirens (Pfeiffer, 1851) and related forms (Gastropoda: Camaenidae) from the Sydney region of Australia /". View thesis, 2005. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20051019.154748/index.html.

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Pinchuck, Shirley Clare. "The ultrastructure and histology of the defensive epidermal glands of some marine pulmonates". Thesis, Rhodes University, 2010. http://hdl.handle.net/10962/d1005481.

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Histology and electron microscopy were used to describe and compare the structure of the dorso-lateral pedal defensive glands of three species of marine Basommatophora, Siphonaria capensis, S. serrata and S. gigas. All three species possessed multi-cellular glands that were larger and most abundant in S. capensis. In S. capensis and S. serrata, defensive glands were composed of two types (type I and II) of large secretory cells filled with product and some irregularly shaped support cells that surrounded a central lumen. The product of both cell types was produced by organelles confined to the bases of the cells. The entire gland was surrounded by a well developed layer of smooth muscle and collagen. Type I cells stained positively for neutral and sulphated mucins, and at the transmission electron microscope level the product had a reticulated appearance. By contrast type II gland cells stained very positively for acidic mucins and the secretory product was formed as large granular vesicles. The product from both types of cell, which appeared to be secreted by holocrine secretion, mixed in the lumen of the duct. Individuals of Siphonaria gigas had two types of lateral pedal glands, a large multi-cellular type and a tubular unicellular gland. The multi-cellular glands, which were surrounded by poorly developed muscle, contained one type of gland cell that stained for neutral and sulphated mucins only, as well as some support cells. The tubular glands contained a heterogeneous product that stained very positively for neutral and sulphated mucins. In addition two species of shell-less marine Systellommatophorans, Onchidella capensis and O. hildae, were examined. Onchidellids also posses large marginal, multi-cellular, epidermal glands that produce a repugnatorial secretion. Like the multi-cellular epidermal glands of siphonariids, those of onchidellids are surrounded by layers of smooth muscle. The muscular capsule was particularly well developed in both species of onchidellid, but more so in O. hildae. In addition, this study has shown that unlike siphonariids, muscle fibres run between the gland cells of O. capensis and O. hildae. Unlike siphonariids, onchidellids have a layer of epithelial cells lining the lumen of the gland. The well developed muscle layer and the strands of muscle running between the different gland cells indicates that the glands can be constricted to forcibly propel their secretions along the length of the duct and away from the body of the animal. Based on their product, glands of O. capensis were comprised of five different types of secretory cell and O. hildae only four. Histological and histochemical staining of the glands of showed that the secretory product is largely made up of acidic mucopolysaccharides and neutral and sulphated mucins. A single species from the order Eupulmonata, Trimusculus costatus, was examined and the glands were very different to the species from the siphonariids and onchidellids. Trimusculus costatus does not have large multi-cellular glands encapsulated in a well developed muscle layer, but based on their cell contents, three different types of large unicellular gland cell can be recognised. The glands of T. costatus gave positive results for acid, neutral and sulphated mucins, but negative results for carboxylated mucin. It is possible that the mucous secreted by T. costatus is also an anti-bacterial agent and whilst not totally eliminating bacteria may prevent the accumulation of epibionts on these sedentary limpets. The acidic or sulphated nature of the secretions may help in this role. The defensive mucous secretions of Siphonaria and Onchidella contain polypropionate derivatives, whilst the active ingredients of Trimusculus mucus have been identified as labdane diterpenes, similar to those produced by opisthobranchs. The structure of the glands thought to produce these repungnatorial secretions is very different, with the glands of T. costatus resembling those of the opisthobranchs.

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Fearon, Janine Lee. "The genetic diversity and conservation biology of the rare terrestrial snail genus Prestonella". Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1003760.

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Prestonella bowkeri and Prestonella nuptialis are montane specialists endemic to the southern Great Escarpment of South Africa. Phylogeographic analyses of these species based on mitochondrial markers CO1 and 16S reveal extremely high levels of divergence between populations indicating a lack of gene flow between populations. This is not surprising, because P. nuptialis and P. bowkeri have limited dispersal capacity, low vagility, a highly fragmented distribution and are habitat specialists that are restricted to isolated mesic refugia associated with waterfalls and montane seepages. A relaxed Bayesian clock estimate suggests that populations diverged from one another during the mid-late Miocene (12.5-7 MYA) which coincides with the modern trends of seasonal aridity which began during the Miocene. This result should be viewed with caution because the rates used are at best imprecise estimates of mutation rates in snails. There is no clear dichotomy between the two species and P. bowkeri is paraphyletic with respect to P. nuptialis, as a consequence the taxonomy is unclear. Due to the high levels of sequence divergence between populations they may be considered as evolutionary significant units (ESU’s). An assessment of haplotype diversity (h) and nucleotide diversity (π) reveals that populations in the western part of the Great Escarpment are more genetically depauperate than populations in the east. Correlations between genetic diversity and climatic variables show that genetically depauperate populations are found in areas that have lower annual rainfall, less reliable rainfall and higher potential evaporation, all factors associated with a drier, less mesic environment that increases the chances of a population bottleneck. This indicates that a shift towards a more arid environment may be a driver of genetic erosion. Historical climate change may thus have affected the amount and distribution of genetic diversity across the Great Escarpment since the Miocene. This has serious future implications for the survival of Prestonella. With predicted increase in global temperatures, climate change in South Africa is likely to result in range contraction and an eastward range shift for many species in the drier central and western areas (Erasmus et al. 2002) and regions along the Great Escarpment are likely to become more arid. Prestonella populations found living on inselbergs along the Great Escarpment are already restricted to site specific watercourses and seepages. An increase in the periods between stream flow, and increasing rainfall variability and mean annual potential evaporation are likely to have an adverse affect on species living in these habitats, resulting in further bottlenecks and possibly local extinction. An IUCN assessment of P. nuptialis and P. bowkeri suggests that these two species are probably endangered. The issue surrounding the conservation of Prestonella species is that they are threatened by global climate change, which cannot be simply restricted or prevented, which makes dealing with the threat of climate change difficult. Assisted migration (MA) may be considered as a method to prevent possible future extinctions of Prestonella populations, but will only be considered as a last resort. The thermal tolerance (Arrhenius breaking temperature and flat-line temperature) of individual snails from three Prestonella populations (one forest population and two thicket populations) were assessed using infrared sensors that detected changes in heart rate with increasing temperature. The forest population had a significantly lower Arrhenius breaking temperature (ABT) and flat-line temperature (FLT) than the two thicket population (p<0.05). Our results do not show a correlation between upper thermal limits and maximum habitat temperatures or other climatic variables in Prestonella populations. Although no correlation is found between ABT and maximum habitat temperature, it is likely that the differences seen between these populations are due to local micro-climate adaptation. The climatic variables used in this experiment are coarse estimates from GIS data and do not reflect actual microhabitat conditions. Forest environments are less heat stressed than thicket environments due to the forest canopy which may explain the lower ABT and FLT of the forest population.

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Rupp, Jens C. "Mate choice and parasitism in freshwater snails". Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339354.

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Shigemiya, Yusuke. "Evolution of colour polymorphism in neritid snails". Kyoto University, 2004. http://hdl.handle.net/2433/147702.

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Kyoto University (京都大学)
0048
新制・課程博士
博士(人間・環境学)
甲第10943号
人博第230号
15||185(吉田南総合図書館)
新制||人||58(附属図書館)
UT51-2004-G790
京都大学大学院人間・環境学研究科環境相関研究専攻
(主査)教授加藤真, 教授松井正文, 助教授宮下英明
学位規則第4条第1項該当

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Tang, Simon. "Studies on molluscicidal compounds from Phytolacca dodecandra ('Endod') and Millettia thonningii". Thesis, King's College London (University of London), 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284415.

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Libri sul tema "Snails"

Cheney, Sheldon. Raising snails. Beltsville, Md: U.S. Dept. of Agriculture, National Agricultural Library, 1988.

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Cheney, Sheldon. Raising snails. Beltsville, Md: U.S. Dept. of Agriculture, National Agricultural Library, 1988.

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Cheney, Sheldon. Raising snails. Beltsville, Md: U.S. Dept. of Agriculture, National Agricultural Library, 1988.

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Thompson, Rebecca. Raising snails. Beltsville, Md: U.S. Dept. of Agriculture, National Agricultural Library, 1996.

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Thompson, Rebecca. Raising snails. Beltsville, Md: U.S. Dept. of Agriculture, National Agricultural Library, 1996.

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Thompson, Rebecca. Raising snails. Beltsville, Md: U.S. Dept. of Agriculture, National Agricultural Library, 1996.

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Oda, Hidetomo. Snails. Milwaukee: Raintree Publishers, 1986.

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Althea. Snails. Harlow: Longman, 1987.

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Gloyn, J. C. Snails. (Newport, I.O.W.): (Isle of Wight Teachers' Centre), 1987.

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Jacobs, Liza. Snails. San Diego, Calif: Blackbirch Press, 2003.

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Capitoli di libri sul tema "Snails"

Dreyfuss, Gilles, Philippe Sindou, Philippe Hourdin, Philippe Vignoles e Daniel Rondelaud. "Fasciola hepatica larval development within the intermediate host." In Fasciolosis, 23–64. 2^a ed. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789246162.0002.

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Abstract This book chapter focuses on host snail species and larval behavior forms in snails, and features of parasitic infections in naturally or experimentally infected snails, or in coinfected snails.

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Bekhit, Alaa El-Din A., Jinlin Shi, Zhijing Ye, Isam A. Mohamed Ahmed, Fahad Y. Al-Juhaimi, William W. Riley e Ravi Gooneratne. "Snails". In Alternative Proteins, 133–72. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9780429299834-6.

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Heller, Joseph. "What Is a Mollusc?" In Sea Snails, 3–10. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15452-7_1.

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Heller, Joseph. "Marine Ancestors of most Land Snails: Pulmonates". In Sea Snails, 257–64. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15452-7_10.

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Heller, Joseph. "Magic, Status and Money". In Sea Snails, 267–83. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15452-7_11.

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Heller, Joseph. "In Palaces and Shrines: Purple and Blue and Shekhelet". In Sea Snails, 285–305. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15452-7_12.

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Heller, Joseph. "Sacred Sounds from Sea Shells". In Sea Snails, 307–18. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15452-7_13.

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Heller, Joseph. "Sexual Perversions". In Sea Snails, 319–22. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15452-7_14.

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Heller, Joseph. "What Is a Snail?" In Sea Snails, 11–33. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15452-7_2.

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Heller, Joseph. "Patellogastropoda: Limpets". In Sea Snails, 37–53. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15452-7_3.

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Atti di convegni sul tema "Snails"

Almeida, Marcelo N., Rodolfo Alves de Oliveira, Luiz Olmes, Gustavo S. Semaan, Daniel de Oliveira, Lúcio Santos e Marcos Bedo. "HELIX: A data-driven characterization of Brazilian land snails". In Simpósio Brasileiro de Banco de Dados. Sociedade Brasileira de Computação - SBC, 2021. http://dx.doi.org/10.5753/sbbd.2021.17892.

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Decision-support systems benefit from hidden patterns extracted from digital information. In the specific domain of gastropod characterization, morphometrical measurements support biologists in the identification of land snail specimens. Although snails can be easily identified by their excretory and reproductive systems, the after-death mollusk body is commonly inaccessible because of either soft material deterioration or fossilization. This study aims at characterizing Brazilian land snails by morphometrical data features manually taken from the shells. In particular, we examined a dataset of shells by using different learning models that labeled snail specimens with a precision up to 97.5% (F1-Score = .975, CKC = .967 and ROC Area = .998). The extracted patterns describe similarities and trends among land snail species and indicates possible outliers physiologies due to climate traits and breeding. Finally, we show some morphometrical characteristics dominate others according to different feature selection biases. Those data-based patterns can be applied to fast land snail identification whenever their bodies are unavailable, as in the recurrent cases of lost shells in nature or private and museum collections.

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Morozova, M. D., S. E. Tshernyshev, R. T.-o. Baghirov, I. B. Babkina, V. P. Modyaeva, K. E. Skriptcova, E. Yu Subbotina, M. V. Shcherbakov e A. V. Simakova. "PRINCIPLES OF TERRESTRIAL INVERTEBRATES BIOMASS NUTRIENT COMPOSITION DESIGN". In X Международная конференция молодых ученых: биоинформатиков, биотехнологов, биофизиков, вирусологов и молекулярных биологов — 2023. Novosibirsk State University, 2023. http://dx.doi.org/10.25205/978-5-4437-1526-1-105.

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The method of providing an invertebrate biomass with particular parameters of a nutrient composition to produce biomass supplied with relatively more nutrients is discussed. An increase in the content of particular nutrients in the biomass of model species Giant African land snail Lissachatina fulica (Férussac, 1821) and the Speckled cockroach Nauphoeta cinerea (Olivier, 1789) was studied via the input of precursor material in the food substrate. A minimal input of vitamins C and B7 to the food substrate resulted in only a slight decrease in the level of protein in biomass of snails from с. 20.4 % to 18.8 % and in cockroaches from c. 8.6 to 8.0 %, but an increase in vitamins B1, B2, B3, B4 and B9 was found in the biomass of snails, and B1, B4 and B9 in cockroaches; the content of liposoluble vitamins A, E, D and K increased significantly in the biomass of cockroaches, but A, E and D increased and K decreased in snails. The content of Se, I, Pb, Hg, Mo, Ca, Na, K and Cl in the biomass of snails and of Fe, Se, Zn, Mn, Mg, P, Ca, Na, K and Cl in cockroaches also increased. It is shown, that food substrate enrichment by precursor material results in nutrient composition changes in the invertebrate biomass.

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Bonilla, Gregory, Eryn Watson, Michael McKinney, Richard Gerhold e Carissa Elonen. "MICROPLASTICS IN TERRESTRIAL SNAILS". In Joint 56th Annual North-Central/ 71st Annual Southeastern Section Meeting - 2022. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022nc-374986.

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Prokhorova, E. E., e R. R. Usmanova. "GENETIC POLYMORPHISM OF SNAILS SUCCINEA PUTRIS (GASTROPODA, PULMONATA)". In V International Scientific Conference CONCEPTUAL AND APPLIED ASPECTS OF INVERTEBRATE SCIENTIFIC RESEARCH AND BIOLOGICAL EDUCATION. Tomsk State University Press, 2020. http://dx.doi.org/10.17223/978-5-94621-931-0-2020-33.

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Genotypic diversity of snails Succinea putris L. (Linnaeus, 1758) collected in the north-west of Russia and in the Republic of Belarus was analysed. Homology between the nucleotide sequences of snails from different population made up 100% by the nucleotide sequence of ITS1-5.8S-ITS2 region of rDNA. Genetic variability based on mitochondrial markers was insignificant. Average genetic distances between samples made up 0,009 for СOI gene loci and 0.008 for CytB gene loci. Was found ten haplotypes of the mitochondrial gene CytB and nine haplotypes of the mitochondrial gene СOI. Perhaps the genetic homogeneity of snails S. putris found in the study explains a low variability of their parasites, trematodes from the genus Leucochloridium.

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Capinera, John L. "Florida’s exotic snails and slugs". In 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.93966.

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King Phillips, Ezekiel, e Yurena Yanes. "ASSESSING SNAIL DIET TO INVESTIGATE NICHE PARTITIONING AMONG TERRESTRIAL SNAILS IN WOODLANDS FROM OHIO". In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-355389.

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Higgins, Dana, Jake A. Carr, Genn Galler e Michael McKinney. "MICROPLASTICS IN SNAILS FROM AN URBANIZED CREEK". In Joint 56th Annual North-Central/ 71st Annual Southeastern Section Meeting - 2022. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022nc-375067.

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Azanza, M. J., e D. Rassi. "Evaluation of biogenic magnetite in bees and snails". In International Conference on Magnetics. IEEE, 1990. http://dx.doi.org/10.1109/intmag.1990.734287.

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Williams, Thomas. "Another Inconvenient Truth: Snails Are More Intelligent Than Us". In 2009 IEEE Custom Integrated Circuits Conference (CICC). IEEE, 2009. http://dx.doi.org/10.1109/cicc.2009.5280907.

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Khussein, Abobakr. "THE EFFECTS MUSIC AND SONIC VIBRATIONS ON SNAILS' COGNITIVE ABILITIES". In XIX INTERNATIONAL INTERDISCIPLINARY CONGRESS NEUROSCIENCE FOR MEDICINE AND PSYCHOLOGY. LCC MAKS Press, 2023. http://dx.doi.org/10.29003/m3407.sudak.ns2023-19/297-298.

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Rapporti di organizzazioni sul tema "Snails"

Morgan Q. Goulding, Morgan Q. Goulding. Eco-friendly and affordable molecular weaponry against snails that transmit schistosomiasis. Experiment, gennaio 2015. http://dx.doi.org/10.18258/4351.

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Gawel, Ann. Pre- and post-storm inventory of endangered Partula radiolata snails at Asan Ridge, Guam. National Park Service, 2024. http://dx.doi.org/10.36967/2303261.

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The Partulidae are a Pacific-wide family of tree snails with high levels of endemism and with a majority of their extant species having special conservation concern. Having radiated across Pacific Islands, this family has evolved with some frequency of tropical storms. However, little is known about their response or recovery rates from severe storms. The island of Guam has its own unique species of Partulidae, Partula radiolata. One of the largest and most accessible occurrences of P. radiolata in the island is located at the Asan Beach Unit of the War in the Pacific National Historical Park. A population assessment of the area?s partulids was conducted approximately one month before a major typhoon ? Typhoon Mawar ? hit the island. The same series of transects used before the typhoon was repeated approximately three weeks after the typhoon. Two hundred twenty-five P. radiolata were counted in the Asan Beach Unit before the typhoon, and 177 after the typhoon. The biggest decline in numbers occurred amongst juvenile partulids ? from 53 counted before the typhoon, to just 11 after the typhoon. The vegetation was severely impacted by the storm, opening up much of the canopy and downing many trees and branches. Despite suffering some obvious mortality, P. radiolata were still persisting within the area. Because this is one of the most accessible populations of P. radiolata, we have an opportunity to monitor post-storm recovery on a regular basis that would be unfeasible at more remote population locations.

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Jay, Elizabeth A. Effect of snails (Elimia clavaeformis) on phosphorus cycling in stream periphyton and leaf detritus communities. Office of Scientific and Technical Information (OSTI), gennaio 1993. http://dx.doi.org/10.2172/10102867.

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Georgieva, Katya, Veselin Nanev, Ina Aneva, Strahil Berkov e Milena Nikolova. Suppression of Fasciola hepatica Transmission by Galba truncatula Snails with Origanum vulgare Subsp. Hirtum Extract and Essential Oil. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, settembre 2021. http://dx.doi.org/10.7546/crabs.2021.09.08.

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Tran, Tut, Alexandra Bonham, Justin Tweet e Vincent Santucci. Bryce Canyon National Park: Paleontological resource inventory. National Park Service, 2024. http://dx.doi.org/10.36967/2302804.

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Originally designated as a national monument in 1923, Bryce Canyon National Park (BRCA) is recognized for its exceptional pink-orange hoodoo landscapes. Its iconic hoodoos, consisting of the Paleocene?Eocene Claron Formation, are only part of the geology of BRCA, which includes a nearly uninterrupted sequence of Late Cretaceous Western Interior Seaway evolution and diverse depositional environments from approximately 100 to 77 million years ago. This sequence consists of the coastal Naturita Formation, the marine Tropic Shale, the transitional Straight Cliffs Formation, and the terrestrial Wahweap Formation. These strata, and the Claron Formation, preserve diverse paleontological resources. Fossils at BRCA have received little visibility for most of the park?s history, despite relatively rapid advances in the study of Late Cretaceous and Paleogene paleontology in neighboring public lands, especially Grand Staircase-Escalante National Monument (GSENM) to the east. The best documentation of paleontological resources at BRCA was produced through concerted field inventory of the park conducted by Dr. Jeff Eaton and several cohorts of interns and students from 1988 to 2015. In that time, Eaton?s team documented nearly 200 paleontological localities within the park that yielded clams, snails, fish, frogs, turtles, lizards, snakes, crocodilians, dinosaurs, and mammals from the Straight Cliffs and Wahweap Formations and invertebrates, plants, and trace fossils in the Claron Formation. Eaton?s survey resulted in several publications, including the description of new microvertebrate species from the Straight Cliffs and Wahweap Formations. Despite this body of work, the park did not develop an internal paleontological resources management program. A new paleontological resources program at BRCA was advanced in response to construction activities that impacted several fossil localities in the Wahweap Formation. Newly hired paleontological staff conducted two seasons of field inventory (2022?2023), relocating as many of Eaton?s sites as possible and recording new fossil occurrences along the way. In this timeframe, BRCA paleontologists encountered more than 150 localities. They also conducted detailed literature review, examined the park?s paleontological collections data, and cultivated partnerships with outside researchers to better comprehend the current state and future potential of the park?s paleontological resources. This document synthesizes the total current body of knowledge on paleontological resources at BRCA to create a comprehensive paleontological inventory report. It combines historical data from the scientific literature, previous work conducted in the park, and recent fieldwork to cover BRCA?s geologic history and fossil diversity and the history of paleontological study, education, and resources management in the park.

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Tran, Tut, Alexandra Bonham, Justin Tweet e Vincent Santucci. Bryce Canyon National Park: Paleontological resource inventory (public version). National Park Service, 2024. http://dx.doi.org/10.36967/2303710.

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Kenneth P Hotopp, Kenneth P. Hotopp. Discovering Maine's Own Freshwater Snail. Experiment, maggio 2013. http://dx.doi.org/10.18258/0489.

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Courant, Ernest D. Helical Siberian Snakes. Office of Scientific and Technical Information (OSTI), marzo 1987. http://dx.doi.org/10.2172/1118911.

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Courant, E. D. Errors in Siberian Snakes. Office of Scientific and Technical Information (OSTI), agosto 1993. http://dx.doi.org/10.2172/1119375.

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Lee, S. Y. Snakes and spin rotators. Office of Scientific and Technical Information (OSTI), giugno 1990. http://dx.doi.org/10.2172/6714405.

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