Growth, Mortality, Fecundity, Biomass and Productivity of Four Lake Populations of the Prosobranch Snail, Viviparus Georgianus

Ecology ◽  
1978 ◽  
Vol 59 (4) ◽  
pp. 742-750 ◽  
Author(s):  
Robert A. Browne
Keyword(s):  
Prosobranch Snail ◽  
Viviparus Georgianus

Digenean parasites in prosobranch snail Lithoglyphus naticoides population with the morphological description of Echinochasmus sp. cercaria

Ekologija ◽  
2008 ◽  
Vol 54 (4) ◽  
pp. 251-255 ◽  
Author(s):  
Gražina Stanevičiūtė ◽  
Romualda Petkevičiūtė ◽  
Valerija Kiselienė
Keyword(s):  
Morphological Description ◽  
Prosobranch Snail ◽  
Lithoglyphus Naticoides

The Natural History of an Ovoviviparous Snail, Viviparus georgianus (Lea), in a Soft-Water Eutrophic Lake

1982 ◽  
Vol 1 (4) ◽  
pp. 2-17 ◽  
Author(s):  
Eileen H. Jokinen ◽  
Jeffrey Guerette ◽  
Robert W. Kortmann
Keyword(s):  
Natural History ◽  
Eutrophic Lake ◽  
Soft Water ◽  
History Of ◽  
Viviparus Georgianus

The Life-Cycle and Morphology of Stemmatostoma-Pearsoni, Gen Et Sp-Nov, With Notes on the Morphology of Telogaster-Opisthorchis Macfarlane (Digenea, Cryptogonimidae)

1986 ◽  
Vol 34 (2) ◽  
pp. 279 ◽  
Author(s):  
TH Cribb
Keyword(s):  
Life Cycle ◽  
Intermediate Host ◽  
Freshwater Fish ◽  
Oral Sucker ◽  
Intermediate Hosts ◽  
Redial Generation ◽  
Adult Morphology ◽  
Mother Sporocyst ◽  
First Intermediate Host ◽  
Prosobranch Snail

Stemmatostoma pearsoni, gen. et sp. nov., is described from the intestine of Leiopotherapon unicolor (Gunther) and Macquaria novemaculeata (Steindachner) in Queensland. Stemmatostoma is placed within the Neochasminae and is distinguished by its long oesophagus, compact ovary, short caeca, pre-ovarian vitellaria, simple gonotyl and funnel-shaped oral sucker. The diagnosis of the Neochasminae is emended excluding Parspina Pearse. Telogaster opisthorchis Macfarlane is recorded from the intestine of Anguilla reinhardtii Steindachner from Victoria. The spinose oral suckers of S. pearsoni and T. opisthorchis are capable of being retracted into tegumental pockets. It is postulated that this arrangement may be widespread amongst spinose cryptogonimids. The first intermediate host of S. pearsoni is Posticobia brazieri (Smith), a prosobranch snail. The second intermediate hosts are freshwater fish: Hypseleotris galii (Ogilby), H. compressus (Krefft), Mogurnda mogurnda (Richardson), M. adspersa (Castelnau), Philypnodon grandiceps (Krefft), Gobiomorphus australis (Krefft), and Pseudomugil signifer Kner. Within the snail there is a mother sporocyst generation, a redial generation and a cercarial generation. Development of the mother sporocyst is similar to that described for other opisthorchioids. Cryptogonimid cercariae are characterized by 16 flame-cells, pre-vesicular penetration glands, dorso-ventral caudal finfolds and absence of body pigmentation. On the basis of cercarial and adult morphology it is proposed that Pseudexorchis Yamaguti be excluded from the Cryptogonimidae.

Paragonimiasis in KwaZulu-Natal province, South Africa

2012 ◽  
Vol 88 (1) ◽  
pp. 123-128 ◽  
Author(s):  
C.C. Appleton
Keyword(s):  
South Africa ◽  
Intermediate Host ◽  
Snail Species ◽  
Sufficient Information ◽  
Suspected Case ◽  
Melanoides Tuberculata ◽  
Kwazulu Natal ◽  
Second Intermediate Host ◽  
Adult Female Patient ◽  
Prosobranch Snail

AbstractNine cases of paragonimiasis have been reported from cats (4), dogs (2) and children (3) in South Africa, with an additional suspected case in an adult female patient. Details of these cases are reviewed. All nine cases, and perhaps the adult case as well, were from the province of KwaZulu-Natal but locality data are only available for six of them. These six cases represent four localities which all lie below 100 m above sea level in the province's lowlands, suggesting that there may be a focus of transmission here. The molluscan first intermediate host must be one of the two prosobranch snail species present in the area,Melanoides tuberculataorTomichia natalensis, and the decapod second intermediate host the common river crabPotamonautes sidneyi. All infected cats and dogs had pulmonary infections, while two human cases for which there is sufficient information had extrapulmonary infections. Transmission appears to be ongoing but the invasive snailTarebia graniferamay be competing with bothM. tuberculataandT. natalensis.If so, this may bring transmission to an end.

Reproductive effort and growth in the prosobranch snail, Viviparus ater

Oecologia ◽  
1987 ◽  
Vol 74 (2) ◽  
pp. 209-214 ◽  
Author(s):  
M. Gebhardt ◽  
G. Ribi
Keyword(s):  
Reproductive Effort ◽  
Prosobranch Snail

Age-related differential catabolism in the snail, Viviparus georgianus, and its significance in the bioenergetics of sexual dimorphism

1986 ◽  
Vol 64 (2) ◽  
pp. 340-346 ◽  
Author(s):  
David W. Aldridge ◽  
W. D. Russell-Hunter ◽  
Daniel E. Buckley
Keyword(s):  
Sexual Dimorphism ◽  
High Protein Diet ◽  
Protein Diet ◽  
Total Carbon ◽  
Age Group ◽  
Carbon And Nitrogen ◽  
Age Related ◽  
Lower Protein ◽  
Carbon Intake ◽  
Viviparus Georgianus

Catabolic partitioning of carbon and nitrogen was investigated to clarify the sexual dimorphism of bioenergetics in Viviparus georgianus. Experiments involved summer stocks of 3-, 15-, 27-, and 39-month-old male and female snails grazing on an artificial high protein diet and, for 15-month snails only, comparison tests using a lower protein diet. Per snail ingestion and partitioning rates and growth are generally maximal for 15-month snails and decline with age in both sexes. In each age group, females have lower rates for weight-specific ingestion of protein carbon and nonprotein carbon than males. For protein carbon, females also show lower rates of catabolism. Compensation for the lower protein diet is more marked in females, which increase total carbon intake by 58% and reduce catabolic use of protein carbon by 40% (against a male reduction of 25%). When discussing evolutionary problems in terms of actuarial bioenergetics, quantification of both physiological rates and ecological efficiencies can be of value in a broadly adaptational approach.

The effects of temperature and salinity on the embryonic development of Hydrobia ulvae (Pennant)

1977 ◽  
Vol 57 (1) ◽  
pp. 213-218 ◽  
Author(s):  
J. D. Fish ◽  
Susan Fish
Keyword(s):  
Embryonic Development ◽  
Shell Length ◽  
Black Pigment ◽  
Swimming Behaviour ◽  
Egg Mass ◽  
Complete Suppression ◽  
Hydrobia Ulvae ◽  
Effects Of Temperature ◽  
Veliger Larvae ◽  
Prosobranch Snail

The prosobranch snail, Hydrobia ulvae, lays eggs on the shells of neighbouring individuals where they are held together and protected by a covering of sand grains. The eggs develop within this egg mass, hatching as veliger larvae for which there are several descriptions (Henking, 1894; Thorson, 1946; Pilkington, 1971; Fish & Fish, 1974). It is clear that there is considerable variation in the size, pigmentation and swimming behaviour of veligers from different localities. The material used in the present study was from a population of snails in the Dovey estuary, Wales, which have free-swimming veliger larvae similar to those described by Thorson (1946). These have a single whorl to the shell; a shell length at hatching of 140–170 µm; a semi-lunate band of purplish black pigment on each velar lobe; a narrow band of pigment between the eyes and black pigment associated with the hindermost part of the intestine. In contrast, those from Ply-mouth hatch with one and a half shell whorls and a colourless velum (Lebour, 1937; Pilkington, 1971); a shell length of 340–390 µm and show complete suppression of the pelagic phase, the velar cilia being short and incapable of lifting the larva off the bottom (Pilkington, 1971). It has been suggested by Pilkington (1971) that the differences in size and swimming behaviour might be the result of the Plymouth larvae hatching at a later stage. The present account is the result of investigations into the effects of temperature and salinity on the survival of embryos to hatching and the duration of embryonic development.

Comparaison entre la capacité de bioaccumulation du mercure chez le gastéropode de faible longévité Vivipanis georgianus (Lea) et le pélécypode Elliptio complanata (Lightfoot) dans l’estuaire d’eau douce du fleuve Saint-Laurent

1992 ◽  
Vol 27 (4) ◽  
pp. 773-786 ◽  
Author(s):  
Louis Tessier ◽  
Guy Vaillancourt ◽  
LeRoy Pazdernik
Keyword(s):  
Nous Avons ◽  
Elliptio Complanata ◽  
Viviparus Georgianus

Nous avons comparé la capacité de bioaccumulation du mercure chez le gastéropode de faible longévité Viviparus georgianus (Lea) ainsi que chez le pélécypode Elliptio complanata (Lightfoot) échantillonnés dans le haut estuaire supérieur et inférieur du fleuve Saint-Laurent. La concentration en mercure a été mesurée dans la chair et la coquille des mollusques. Des comparaisons ont été faites entre les espèces et entre les deux milieux échantillonnés. Les résultats indiquent que la teneur en mercure du secteur étudié est relativement faible. Le prosobranche V. georgianus concentre le mercure biodisponible du sédiment et le pélécypode E. complanata celui de l’eau, résultant de modes alimentaires différents. Le taux de déposition du mercure dans la coquille dépend de la concentration biodisponible dans l’eau lors de la formation de celle-ci.

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