| [infestation of littoral molluscs of dal'nie zelentsy bay by parthenitae of the eider parasite microphallus pygmaeus (levinsen, 1881) (trematoda: microphallidae)]. | the mollusks littorina saxatilis, l. obtusata, solariella obscura, cingula aculeus, hydrobia ulvae, margarites helicina and m. groenlandica serve as hosts of the parthenites of microphallus pygmaeus in eastern murman. over a period of 20 years the infection rate of the mollusks has increased greatly that is associated with the increasing number of definitive hosts. maximum infection rate was recorded in the end of july--august. the infection rate of littorins within this period was about 90 per ... | 1975 | 130602 |
| [contribution to the study of microphallidae travassos, 1920 (trematoda). xxxi. on the shortening of microphallid life-cycles, concerning maritrema oocysta (lebour, 107)]. | in france, the larval forms (daughter sporocysts, cercariae and metacercariae) of m. oocysta develop in hydrobia ulvae pennant living on norman coasts of the channel; they are described again. the microphallid family offers two kinds of development: the first sort concerns the appearance of a progenetic metacercaria, the second concerns that of a confined cercaria. twelve examples illustrate the tendencies of this evolution. | 1975 | 1221912 |
| in ovo cultivation of microphallus primas (trematoda: microphallidae) metacercariae to ovigerous adults and the establishment of the life-cycle in the laboratory. | this investigation reports for the first time the establishment of a trematode life-cycle in the laboratory using in ovo cultivation of the adult stage. microphallus primas metacercarial cysts were removed from carcinus maenas crabs and chemically excysted. using a modification of the technique developed by fried (1962) the released metacercariae were grown in fertile hen's eggs to ovigerous adult flukes. these were removed from the under surface of the chorio-allantoic membrane of chick embryos ... | 1991 | 1780184 |
| the life cycle of pygidiopsis ardeae køie, 1990 (digenea, heterophyidae). | ocellate cercariae, consistent with the description of cercaria angularis honer, 1961, developing in rediae in hydrobia ulvae (pennant) and hydrobia ventrosa (montagu) (prosobranchia, hydrobiidae) from denmark, were shown to be larvae of pygidiopsis ardeae køie, 1990 (heterophyidae, pygidiopsinae). euryhaline fishes such as the sticklebacks gasterosteus aculeatus linnaeus and pungitius pungitius (linnaeus), and the common goby pomatoschistus microps (krøyer) are second intermediate hosts in dani ... | 1990 | 2380862 |
| use of an in ovo technique to provide adults of levinseniella sp. no. 17 that were identified as levinseniella minuta (trematoda: microphallidae). | metacercarial cysts identified as levinseniella sp. no. 17 (deblock, 1980) were found in the mud snail hydrobia ulvae. these larval trematodes had never been allied to a known species of adult worm. they were chemically excysted and cultured for 120 hr on the chorioallantoic membranes of chicken embryos. the resulting adult worms were observed by light and scanning electron microscopy and details of their anatomy and topography were compiled. their morphometric measurements were compared with th ... | 1998 | 9714229 |
| [the influence of infections with trematodes bunocotyle progenetica (hemiuridae) and cryptocotyle cancavum (heterophiidae) onto mortality of littoral molluscs hydrobia ulvae (gastropoda: prosobranchia) in condition of extremely high temperature]. | the effect of invasion of two trematode species, bunocotyle progenetica (hemiuridae: bunocotylinae) and cryptocotyle cancavum (heterophiidae) on the host vitality is estimated. the mortality of infected and uninfected individuals of hydrobia ulvae after different exposure time (3, 6, 9 and 12 hours) under extremely high temperature (+42 degrees c) was compared. the total death of the host was observed after 12 hours of experiment. the death rate of molluscs infected with b. progenetica ranged fr ... | 2004 | 15493287 |
| [the influence of infections with trematodes bunocotyle progenetica (hemiuridae) and cryptocotyle cancavum (heterophyidae) onto mortality of littoral mollusks hydrobia ulvae (gastropoda: prosobranchia) after freezing]. | the mortality of prosobranch snails hydrobia ulvae uninfected and infected with the parthenites of two species of trematodes (bunocotyle progenetica and cryptocotyle cancavum) after freezing in seawater of different salinity with following thawing has been studied. reduced salinity exceeds mortality of snails under freezing significant (p < 0.01). the mortality of mollusks increases significant (p < 0.01) with the increase of the exposure time. the mortality of females exceeds the mortality of m ... | 2005 | 16316058 |
| rediae of echinostomatid and heterophyid trematodes suppress phagocytosis of haemocytes in littorina littorea (gastropoda: prosobranchia). | a modulation of the phagocytic activity of hemocytes from the common periwinkle littorina littorea by secretory-excretory products (sep) released by trematode rediae during axenic in vitro cultivation was studied. the sep released by the parasites himasthla elongata (echinostomatidae) and cryptocotyle lingua (heterophyidae) were found to inhibit the phagocytosis of zymozan particles by periwinkle hemocytes. the specificity of sep effects was assessed: sep of himasthla militaris and cryptocotyle ... | 2006 | 16438967 |
| habitat and transmission--effect of tidal level and upstream host density on metacercarial load in an intertidal bivalve. | transmission of parasites may be mediated by their habitat, consisting of abiotic and biotic components. i investigated the effect of 2 important habitat components in intertidal ecosystems, tidal level (abiotic) and density of upstream hosts (biotic), on the transmission of trematode cercariae to cockle (cerastoderma edule) hosts. a field survey showed no general trend in metacercarial loads of cockles regarding tidal level but species-dependent reactions. parasites originating from littorina l ... | 2007 | 17076926 |
| impact of biodiversity-climate futures on primary production and metabolism in a model benthic estuarine system. | understanding the effects of anthropogenically-driven changes in global temperature, atmospheric carbon dioxide and biodiversity on the functionality of marine ecosystems is crucial for predicting and managing the associated impacts. coastal ecosystems are important sources of carbon (primary production) to shelf waters and play a vital role in global nutrient cycling. these systems are especially vulnerable to the effects of human activities and will be the first areas impacted by rising sea le ... | 2011 | 21320339 |
| a method for genotype validation and primer assessment in heterozygote-deficient species, as demonstrated in the prosobranch mollusc hydrobia ulvae. | in studies where microsatellite markers are employed, it is essential that the primers designed will reliably and consistently amplify target loci. in populations conforming to hardy-weinberg equilibrium (hwe), screening for unreliable markers often relies on the identification of heterozygote deficiencies and subsequent departures from hwe. however, since many populations naturally deviate from hwe, such as many marine invertebrates, it can be difficult to distinguish heterozygote deficiencies ... | 2008 | 18713472 |
| short-term effects of reclamation of part of seal sands, teesmouth, on wintering waders and shelduck : i. shorebird diets, invertebrate densities, and the impact of predation on the invertebrates. | the invertebrate macrofauna of seal sands, teesmouth, is very limited in species composition. nereis diversicolor has a two-year life cycle; the larger size-class provides the main prey of the birds pluvialis squatarola, numenius arquata and limosa lapponica. hydrobia ulvae is an important food of p. squatarola and calidris canutus. small carcinus maenas occur in late autumn and are taken by the larger shorebirds. small macoma balthica are also taken, but are scarce and not an important bird foo ... | 1979 | 28308862 |
| distance decay of similarity among parasite communities of three marine invertebrate hosts. | the similarity in species composition between two communities generally decays as a function of increasing distance between them. parasite communities in vertebrate definitive hosts follow this pattern but the respective relationship in intermediate invertebrate hosts of parasites with complex life cycles is unknown. in intermediate hosts, parasite communities are affected not only by the varying vagility of their definitive hosts (dispersing infective propagules) but also by the necessary coinc ... | 2009 | 19189130 |
| burial survival of benthic macrofauna following deposition of simulated dredged material. | in many coastal regions, the disposal of dredged material constitutes the largest (albeit often localised) anthropogenic disturbance to the seabed. impacts can be minimised by reducing the amount of sediment overburden on the bed at any one time allowing short-term recovery to proceed via the vertical migration of resident species. however, there is currently a limited understanding of the ability of such species to successfully vertically migrate. this study presents the findings of a field exp ... | 2011 | 21188510 |
| use of its rdna for discriminating of larval stages of two microphallid (digenea) species using hydrobia ulvae (pennant, 1777) and corophium volutator (pallas, 1766) as intermediate hosts. | digenean trematodes encompass several species with little morphological differentiation in the larval stages and, as a result, uncertainty prevails regarding species identification. the microphallid trematode maritrema subdolum occurs widespread geographically in mud snail and crustacean hosts in european marine shallow-water ecosystems. larval stages of this and other congeneric species are, however, difficult to separate morphologically. to verify the species status and to secure identificatio ... | 2004 | 15185143 |