| correlation of development of altered evasive behavior in gammarus lacustris (amphipoda) harboring cystacanths of polymorphus paradoxus (acanthocephala) with the infectivity to the definitive host. | | 1974 | 4821113 |
| [crystallization of aqueous solutions of cryoprotectors from atlantic cod and lake gammarus]. | a comparative analysis of two types of cryoprotectants, antifreeze glycoproteins from atlantic cod (gadus morhua) and carbohydrates from hemolymph of amphypoid crustacean (gammarus lacustris) has been performed. both glycoprotein and carbohydrate antifreezes effectively decreased the freezing point of water solutions and diminished the size of ice crystals formed. noncolligative and colligative mechanisms of action are characteristic correspondingly for glycoproteins and carbohydrates. | 1996 | 9044625 |
| [molecular nature of the cryotolerant lake amphipod gammarus lacustris]. | gammarus lacustris were studied in an attempt to identify the mechanism of subzero temperature adaptation, which enables this species to survive in winter under natural conditions. g. lacustris hemolymph contained a high concentration of glucose (42.4 mg/ml of hemolymph). in addition, galactose, mannose, xylose, zellobiose, and unidentifiable disaccharides and oligosaccharides were found, though at much lower concentrations (0.94-3.26 mg/ml). the glycerol concentration in the gammarus hemolymph ... | 2002 | 11855280 |
| modulating the modulators: parasites, neuromodulators and host behavioral change. | neuromodulators can resculpt neural circuits, giving an animal the behavioral flexibility it needs to survive in a complex changing world. this ability, however, provides parasites with a potential mechanism for manipulating host behavior. this paper reviews three invertebrate host-parasite systems to examine whether parasites can change host behavior by secreting neuromodulators. the parasitic wasp, cotesia congregata, suppresses host feeding partly by inducing the host (manduca sexta) to incre ... | 2002 | 12563169 |
| ingestion and adsorption of bacillus thuringiensis subsp. israelensis by gammarus lacustris in the laboratory. | several groups of gammarus lacustris adults were exposed to solutions containing 0.5 and 5.0 mg of bacillus thuringiensis subsp. israelensis per liter for 1- or 24-h periods by using traditional static bioassay exposure procedures. during a postexposure holding period, fecal pellets were removed and plated on tryptic soy agar to determine b. thuringiensis subsp. israelensis spore content. the experiments verified that traditional exposure procedures assure ingestion of b. thuringiensis subsp. is ... | 1986 | 16347242 |
| [ecology of gammarus lacustris sars (crustacea: amphipoda) in transbaikalian water bodies]. | the data on gammarus lacustris sars, 1863 ecology in transbaikalian water bodies was integrated by the example of lakes khalanda, bain-tsagan, arakhlei, zun-torei, and bain-bulak. the impact of the major environmental factor on the pattern of g. lacustris spatial distribution, linear size, growth rate, time of reaching sexual maturity, and number of reproduced generations was shown. the role of g. lacustris in the ecosystem of studied water bodies was evaluated and the adaptive significance of t ... | 2007 | 17668463 |
| [free amino acids and reducing sugars in the freshwater shrimp gammarus lacustris (crustacea, amphipoda) at the initial stage of preparation to winter season]. | a peculiarity of amino acid profile of the cold-resistant freshwater shrimp gammarus lacustris in the beginning of autumn is a high level of ornithine, the second after alanine (17.0 +/- 1.4 and 22.6 +/- 1.4 micromol/ml of homogenate, respectively). the amount of alanine and ornithine accounts for 39.8% of the total pool of free amino acids and together with lysine and leucine - 55%. free glucose is the major reducing sugar (6.42 +/- 0.78 micromol/ml). | 2010 | 20799603 |
| chemical interactions between two dominant species in lake shira: gammarus lacustris sars (crustacea: amphipoda) and arctodiaptomus salinus daday (crustacea: copepoda). | | 2010 | 20963653 |
| comparative study of thermoresistances' cellular mechanisms in representatives of the gammarus lacustris sars populations inhabiting saline lake shira (republic of khakassia) and a fresh water body in the cis-baikal region. | | 2010 | 20963664 |
| evaluation of biochemical responses in palearctic and lake baikal endemic amphipod species exposed to cdcl2. | this study evaluated small heat shock proteins (shsp) (related to alpha-crystallin) and antioxidant enzymes (pod, peroxidase and cat, catalase) as possible biomarkers for use in toxicological studies. biochemical responses to cadmium chloride in two lake baikal endemic amphipods (eulimnogammarus verrucosus, eulimnogammarus cyaneus) and palearctic species (gammarus lacustris) were compared. our findings showed that cadmium chloride toxicity directly influenced pod activity and shsp synthesis in a ... | 2008 | 17920682 |
| fine stratified distribution of gammarus lacustris sars (crustacea: amphipoda) in the pelagic zone of the meromictic lake shira (khakassia, russia). | | 2006 | 17396578 |
| natural organic matter (nom) induces oxidative stress in freshwater amphipods gammarus lacustris sars and gammarus tigrinus (sexton). | humic substances comprise the majority of natural organic matter (nom) on earth, including dissolved organic matter in freshwater systems. recent studies show that these substances directly interact with aquatic organisms as chemical stressors. the aim of the present study was to investigate the mode of action of dissolved nom on the freshwater amphipods gammarus lacustris sars and gammarus tigrinus (sexton), and in particular, to determine if nom induces or promotes internal oxidative stress. n ... | 2006 | 16542708 |
| antioxidant enzyme activity in endemic baikalean versus palaearctic amphipods: tagma- and size-related changes. | the activities of key antioxidant enzymes in two endemic baikalean amphipod species: pallasea cancelloides (gerstf), eulimnogammarus verrucosus (gerstf) and the widely distributed palearctic species gammarus lacustris (sars) were studied. this work was done to prove or disprove the hypothesis that baikalean endemics have specifics in antioxidants system different from palearctic species. the activities of antioxidant enzymes peroxidase, catalase and glutathione-s-transferase were measured in dif ... | 2006 | 16460977 |
| aggregation of helminths: the role of feeding behavior of fish hosts. | individual arctic charr (salvelinus alpinus) from fjellfrøsvatn, northern norway, could be categorized by their stomach contents as zooplanktivores or benthivores. feeding specialization among these fish was evident from negative correlations between helminths transmitted by pelagic copepods (diphyllobothrium dendriticum and d. ditremum) and those transmitted by the benthic amphipod gammarus lacustris (cystidicola farionis and cyathocephalus truncatus). occurrences of parasite species acquired f ... | 2004 | 15040660 |
| concentrations of organochlorine pesticides and polychlorinated biphenyls in amphipods (gammarus lacustris) along an elevation gradient in mountain lakes of western canada. | populations of the amphipod gammarus lacustris were examined for their concentrations of organochlorine pesticides and polychlorinated biphenyls (pcbs) from seven lakes spanning a 1,300-m elevation gradient in alberta, canada. the concentrations of several of the semivolatile organochlorine compounds ([svocs], vapor pressure > 0.03 pa at 20 degrees c) increased at higher altitudes. this pattern was generally not observed among the less volatile organochlorines ([lvocs]. vapor pressure < 0.03 pa ... | 2003 | 14587899 |
| selective predation on parasitized prey--a comparison between two helminth species with different life-history strategies. | in lake fjellfrøsvatn, northern norway, the larval helminths cyathocephalus truncatus and cystidicola farionis use gammarus lacustris as intermediate hosts and arctic charr (salvelinus alpinus) as final hosts. there was sampled 1,433 live g. lacustris from the lake and 1,964 g. lacustris from stomach contents of the charr. prevalence of infection were, respectively, 0.49% and 3.72% for c. truncatus, and 0.21% and 0.20% for c. farionis. usually, only 1 parasite was present in each host, and the 2 ... | 2001 | 11695412 |
| avoidance of conspecific injury-released chemical cues by free-ranging gammarus lacustris (crustacea:amphipoda). | behavioral responses to chemical cues have been demonstrated for a range of aquatic animals. injury-released chemical alarm cues from conspecifics are released when a prey's predator is actively foraging. detection of these cues elicits antipredator behaviors that reduce the probability of predation. amphipod crustaceans in the genus gammarus are widespread denizens of ponds and streams. antipredator responses by gammarus to conspecific alarm cues, and subsequent reduction of predation risk, are ... | 2001 | 11504026 |
| acute toxicity of sodium selenate to two daphnids and three amphipods. | this study evaluated the acute toxicity of sodium selenate to two daphnid and three gammarid amphipod species. the daphnids, ceriodaphnia dubia and daphnia pulex, were evaluated in 48-hour static tests and the amphipods, gammarus pseudolimnaeus, gammarus lacustris, and hyalella azteca, were evaluated in 96-hour static and flow-through tests. tests resulted in mean lc50's of 1.92, 9.12, 1.82, 3.05, and 1.95 mg/l selenium for c. dubia, d. pulex, g. pseudolimnaeus, g. lacustris, and h. azteca, resp ... | 2001 | 11339714 |
| selection of an aquatic indicator species to monitor organic contaminants in trophically simple lotic food webs | a four-step procedure was used to identify an aquatic macroinvertebrate with which to monitor organic contaminant burdens in trophically simple lake food webs of alberta, canada. we identified leeches (oligochaeta: hirudinea) as the potential indicator assemblage (step 1), and then documented their abundance and distribution in 16 lakes to identify a species-level bioindicator (step 2). the latter two steps involved identifying the number and level of organic contaminants within the indicator sp ... | 1998 | 9776773 |
| a chromosome study in the progenetic cestode cyathocephalus truncatus (cestoda:spathebothriidea). | the chromosomes of somatic cells of progenetic cyathocephalus truncatus, parasite of amphipod crustaceans, gammarus lacustris, from north-west chukotka were investigated using standard giemsa staining. the karyotype, not described previously, consists of 9 pairs of chromosomes (2n = 18), the most widespread number among cestodes. a considerable number of polypoid cells (34.7%) was noted in preparations. the chromosomes are comparatively large, up to 12.26 microns. according to centromeric index ... | 1996 | 9024864 |
| gammarus lacustris harboring polymorphus paradoxus show altered patterns of serotonin-like immunoreactivity. | the pattern of serotonin-like immunoreactivity in the central nervous system of individuals of the amphipod gammarus lacustris harboring polymorphid cystacanths was compared to the pattern seen in individuals not infected with acanthocephalans. ventral nerve cords from both parasitized and nonparasitized amphipods showed the same bilateral pair of immunoreactive cell bodies in the third thoracic ganglion. significant differences were noted in the fine structure of these cell bodies, with nerve c ... | 1996 | 8691384 |
| life-cycles of helminth parasites using gammarus lacustris as an intermediate host in a canadian lake. | | 1969 | 5390576 |
| [changes in the monocercus cercomer in the cysticercoid cavity and the hemocoel of the nonspecific host]. | in order to elucidate the functional role of cercomer in larvae of the monocercus type their transplantation from the specific host chironomus obtusidens to gammarus lacustris was conducted. at early stages after the transplantation proceeds an increase in the functional activity of the tegument of follicles of the cercomer followed by their complete destruction in 3 or 4 days. on the surface of the exocyst membrane an adhesion of the host's haemocytes occurs, which becomes more distinct in 3-4 ... | 1989 | 2717202 |
| hexachlorobenzene uptake by fathead minnows and macroinvertebrates in recirculating sediment/water systems. | fathead minnows (pimephales promelas), the worm, lumbriculus variegatus, and the amphipods hyalella azteca and gammarus lacustris were exposed to hexachlorobenzene (hcb) in water with and without a bed of hcb-spiked sediment. water hcb concentrations were maintained by recirculation through hcb-packed columns. recirculating hcb-bound particulates and possibly eroded hcb particulates were an added source of hcb in addition to the sediment bed. significant bioaccumulation of hcb in animal tissues ... | 1990 | 2331142 |
| [the biology of the thorny-headed worms, parasites of trout acclimatized in the bodies of water of the tien shan]. | a new species of acanthocephala, a parasite of local naemacheilus stoliczkai, was recorded from salmo gairdneri after 9 years of its introduction into mountain water bodies of tien shan. gammarus lacustris serves as an intermediate host. dynamics of infection of trout for 9 years is shown. | 1992 | 1299803 |
| [occurrence of helminths in amphipods gammarus lacustris sars, 1863 (amphipoda: gammaridae) from kronotskoe lake (kamchatka)]. | metacercariae of crepidostomum metoecus (prevalence 2.0%), procercoids of cyathocephalus truncatus (2.9%), and nematodes of the family cystidicolidae (17.6%) were found in the body cavity of amphipods gammarus lacustris from the kronotskoe lake. the nematodes were presented by cystidicola farionis (third-stage juvenile) and ascarophis sp. (adult and fourth-stage juvenile). | 2015 | 25702505 |
| ecosystem ecology meets adaptive management: food web response to a controlled flood on the colorado river, glen canyon. | large dams have been constructed on rivers to meet human demands for water, electricity, navigation, and recreation. as a consequence, flow and temperature regimes have been altered, strongly affecting river food webs and ecosystem processes. experimental high-flow dam releases, i.e., controlled floods, have been implemented on the colorado river, u.s.a., in an effort to reestablish pulsed flood events, redistribute sediments, improve conditions for native fishes, and increase understanding of h ... | 2011 | 21939041 |
| eocene habitat shift from saline to freshwater promoted tethyan amphipod diversification. | current theory predicts that a shift to a new habitat would increase the rate of diversification, while as lineages evolve into multiple species, intensified competition would decrease the rate of diversification. we used holarctic amphipods of the genus gammarus to test this hypothesis. we sequenced four genes (5,088 bp) for 289 samples representing 115 gammarus species. a phylogenetic analysis showed that gammarus originated from the tethyan region with a saline ancestry in the paleocene, and ... | 2011 | 21844362 |
| evidence for substrate influence on artificial substrate invertebrate communities. | cobble baskets are frequently used as a tool to measure differences in benthic macroinvertebrate communities between waterbodies; however, underlying differences in substrate type may influence the resultant colonization of baskets, misrepresenting communities. this study tests the hypothesis that cobble basket placement influences the resulting benthic macroinvertebrate community. cobble basket arrays (n = 4) were deployed in dog lake, saskatchewan, in 2011 (97 d) and 2012 (95 d) on cobble habi ... | 2017 | 28679170 |