| 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 |
| rainbow trout (salmo gairdneri) stocking and contracaecum spp. | a stocking program with rainbow trout (salmo gairdneri) at high rock lake, manitoba failed due to infections with large numbers of contracaecum spp. larvae. nematode larvae in the intestinal tract, body cavity and musculature made the fish unmarketable. a combination of experimental infections of rainbow trout and pelicans (pelecanus erythrorhynchos), observations on the behavior of fish-eating birds, and numbers of larval contracaecum spp. in minnow species led to the following conclusions. the ... | 1987 | 3586201 |
| observations on the occurrence of diplostomum spathaceum and schistocephalus sp. in ninespine sticklebacks (pungitius pungitius) from the belcher islands, northwest territories, canada. | all 175 ninespine sticklebacks, pungitius pungitius (linné), collected from the belcher islands were parasitized by diplostomum spathaceum (rudolphi) and 43% by schistocephalus sp. d. spathaceum metacercariae were mostly confined to a dorso-ventral band encircling the lens of the eye, and were concentrated in the anterio-dorsal sector of this band. the central area of the lens was thus relatively free of diplostomula, probably minimizing interference with the vision of the fish. the frequency di ... | 1981 | 6894622 |
| [predators, resources, and trophic chains in the regulation of plankton population and biomass in oligothrophic lakes]. | the relative strength of "top-down" versus "bottom-up" control of plankton community structure and biomass in two small oligotrophic lakes (with and without fish), located near the polar circle (russia), has been investigated for two years, 1996 and 1997. the comparative analyses of zooplankton biomass and species abundance showed strong negative effect of fish, stickeback (pungitius pungitius l.), on the zooplankton community species, size structure and biomass of particular prey species but no ... | 2000 | 11190562 |
| parasite populations and communities from the shallow littoral of the orther bight (fehmarn, sw baltic sea). | parasites of host guilds, such as mud snails (five species), benthic crustaceans (six species) and small-sized fishes ( pomatoschistus microps, gasterosteus aculeatus, pungitius pungitius, young pleuronectes flesus), were investigated in the other bight off west fehmarn (kiel bight, german baltic sea). the hosts, especially the herbivorous hydrobia spp, gammarus spp and idothea chelipes, attained extremely high densities in three habitats ( enteromorpha belt, fucus belt, sandy bottom), which may ... | 2002 | 12122431 |
| the crossroads of molecular, typological and biological species concepts: two new species of gyrodactylus nordmann, 1832 (monogenea: gyrodactylidae). | nucleotide sequences of nuclear ribosomal dna internal transcribed spacers (its) were used to confirm morphological identification of gyrodactylus species in fennoscandia. three pairs of morphologically similar or cryptic species are compared in this study. g. branchicus malmberg, 1964 and g. rarus wegener, 1910, hosted by the sticklebacks gasterosteus aculeatus l. and pungitius pungitius (l.), respectively, displayed a genetic divergence of 0.9-1.3% along 774 nucleotides of its (jukes & cantor ... | 2003 | 12815215 |
| hybrid male sterility between the fresh- and brackish-water types of ninespine stickleback pungitius pungitius (pisces, gasterosteidae). | two ecologically distinct forms, fresh- and brackish-water types, of ninespine stickleback co-exist in several freshwater systems on the coast of eastern hokkaido. recent genetic analyses of 13 allozyme loci revealed genetic separation between the two types even though their spawning grounds were in close proximity. on the other hand, there is only a small difference in mitochondrial dna (mtdna) sequence between the two types suggesting that they diverged quite recently or that mtdna introgressi ... | 2005 | 15684581 |
| [parasite fauna in sticklebacks (gasterosteidae) from bodies of water of the kola region]. | the results of a parasitological study of the two species of sticklebacks (pungitius pungitius and gasterosteus aculeatus) inhabiting the kola region are presented. the 42 and 14 species of parasite were found in the nine-spined and three-spined stickleback, respectively. the paucity of the parasite fauna in the three-spined stickleback is observed. distribution of parasites in kola waterbodies and ecological peculiarities in system "parasite-host" are presented. | 2005 | 15810555 |
| a checklist of parasites recorded on sticklebacks (actinopterygii: gasterosteidae) from poland. | parasites of the three-spined stickleback, gasterosteus aculeatus (l.), and the nine-spined stickleback, pungitius pungitius (l.), from brackish and freshwater habitats in poland are listed. the following list was compiled from published records and own long-term studies. parasites are listed alphabetically in meaningful groups of parasites with notes about their location on the host and distribution in poland with references. a total of 51 species (taxa) of parasites were recorded on g. aculeat ... | 2006 | 16343983 |
| parasites of sticklebacks (actinopterygii: gasterosteidae) from south-eastern baltic sea (poland). | a total of 142 individuals of gasterosteus aculeatus l. and 22 individuals of pungitius pungitius (l.) from several areas of the coastal waters of the gdańsk bay both brackish- and freshwater were examined for parasites. the survey was carried out within 1988-1991. six parasite species, namely: gyrodactylus arcuatus, apatemon gracilis, sphaerostomum bramae, phyllodistomumfolium, neoechinorhynchus rutili, and argulus foliaceus were recovered from sticklebacks caught in freshwater habitats; while ... | 2005 | 16838625 |
| parasitofauna of the nine-spined stickleback from the gulf of gdańsk and the mouth of dead vistula. | four species, one subspecies and one parasite marked to the genus were collected from the nine-spined stickleback pungitius pungitius l. from the gulf of gdańsk and the mouth of dead vistula. nine-spined stickleback was noted as a new host in polish coastal water for five parasites: glugea anomala (microsporidia), diplostomum spathaceum (digenea-metacercariae) and apatemon sp. (digenea-incysted metacercariae), hysterothylacium aduncum (nematoda-third stage larvae) and thersitina gasterostci (cop ... | 2000 | 16886342 |
| schistocephalus cotti n. sp. (cestoda: pseudophyllidea) plerocercoids from bullheads cottus gobio l. in an arctic river in finland, with a key to the plerocercoids of the palaearctic species of the genus. | we compared plerocercoids of schistocephalus creplin, 1829 from cottus gobio (n = 57) and gasterosteus aculeatus f. semiarmatus (n = 45) from the river utsjoki, finland, taken only from single worm infections. segment numbers in the two populations were distinct (g. aculeatus range 55-107, average 74 (se 1.66), median 73; c. gobio range 122-189, average 146 (se 1.78); median 144). the mean difference between populations, 71.47, t = 28.76 with 100 degrees of freedom, two-tailed p value <0.001, wa ... | 2006 | 16944267 |
| parallel genetic origins of pelvic reduction in vertebrates. | despite longstanding interest in parallel evolution, little is known about the genes that control similar traits in different lineages of vertebrates. pelvic reduction in stickleback fish (family gasterosteidae) provides a striking example of parallel evolution in a genetically tractable system. previous studies suggest that cis-acting regulatory changes at the pitx1 locus control pelvic reduction in a population of threespine sticklebacks (gasterosteus aculeatus). in this study, progeny from in ... | 2006 | 16945911 |
| first report of gyrodactylus spp. (platyhelminthes: monogenea) in the western mediterranean sea: molecular and morphological descriptions. | the gyrodactylus spp. fauna on species of gobies, pomatoschistus, gobiusculus, and knipowitschia (gobiidae: teleostei), from the western mediterranean and adriatic seas is strikingly similar to that found in the baltic sea and eastern atlantic ocean, both in morphology and in internal transcribed spacer (its) rrna. the fauna consisted of gyrodactylus branchialis, g. ostendicus, g. gondae, g. rugiensis, g. rugiensoides, and g. arcuatus. no new species have been found. a morphometric comparison be ... | 2006 | 16995382 |
| community structure, population structure and topographical specialisation of gyrodactylus (monogenea) ectoparasites living on sympatric stickleback species. | in order to disentangle the contribution of host and parasite biology to host specificity, we compared the structure and population dynamics of the gyrodactylus (von nordmann, 1832) flatworm community living on sympatric three-spined gasterosteus aculeatus l. and nine-spined pungitius pungitius (l.) stickleback. between april 2002 and march 2003, a small lowland creek was sampled monthly. species identity of about 75% of the worms per host was determined with a genetic nuclear marker (its1). eac ... | 2008 | 19202677 |
| THE RISE AND FALL OF AN EPIZOOTIC OF THE DIPHYLLOBOTHRIIDEAN CESTODE SCHISTOCEPHALUS PUNGITII INFECTING THE NINESPINE STICKLEBACK. | Abstract Epizootics of diphyllobothriidean cestodes appear to be simple, but deceptive similarity conceals the myriad ways in which these events are shaped by complex abiotic and biotic interactions. In Dog Bone Lake, Alaska, an epizootic of Schistocephalus pungitii infecting the ninespine stickleback (Pungitius pungitius) was short-lived. Its duration, with a peak that lasted only 1 yr, was shorter than for previously documented epizootics in Schistocephalus solidus. The ability of the nin ... | 2011 | 21895527 |
| high levels of fluctuating asymmetry in isolated stickleback populations. | fluctuating asymmetry (fa), defined as small random deviations from the ideal bilateral symmetry, has been hypothesized to increase in response to both genetic and environmental stress experienced by a population. we compared levels of fa in 12 bilateral meristic traits (viz. lateral-line system neuromasts and lateral plates), and heterozygosity in 23 microsatellite loci, among four marine (high piscine predation risk) and four pond (zero piscine predation risk) populations of nine-spined stickl ... | 2012 | 22788717 |
| the cestode parasite schistocephalus pungitii: castrator or nutrient thief of ninespine stickleback fish? | in this investigation, the host-parasite relationship of ninespine stickleback fish pungitius pungitius and the cestode parasite schistocephalus pungitii was studied using samples from dog bone lake, kenai peninsula, alaska, to test the hypothesis that s. pungitii is a castrator of ninespine stickleback. infected, adult females of all sizes (ages) were capable of producing clutches of eggs. s. pungitii had a negative effect on the ability of host females to produce a clutch, which was related to ... | 2017 | 28073385 |
| bioaccumulation and trophodynamics of the antidepressants sertraline and fluoxetine in laboratory-constructed, 3-level aquatic food chains. | although reports of pharmaceutical bioconcentration in aquatic organisms are increasing, less is known about trophic transfer in aquatic food webs. the bioaccumulation and trophodynamics of sertraline and fluoxetine, 2 selective serotonin reuptake inhibitors (ssris) frequently detected in aquatic environments, were tested by exposing constructed aquatic food chains to ssris under controlled laboratory conditions. both of these ionizable, weak base pharmaceuticals showed lower bioaccumulation fac ... | 2017 | 27696515 |
| parasite diversity of sticklebacks from the baltic sea. | in the brackish baltic sea, the species richness and diversity of parasite communities of three- (gasterosteus aculeatus) and nine-spined sticklebacks (pungitius pungitius) were investigated. the studies regarded four localities at the schleswig-holstein and mecklenburg coasts, northern germany, where salinities were between 10 and 18 per thousand. species richness was relatively high, attaining 15 parasite species in g. aculeatus and 16 in p. pungitius, which are only surpassed by former invest ... | 2007 | 17036245 |
| persistent organochlorine pesticide exposure related to a formerly used defense site on st. lawrence island, alaska: data from sentinel fish and human sera. | st. lawrence island, alaska, is the largest island in the bering sea, located 60 km from siberia. the island is home to approximately 1600 st. lawrence island yupik residents who live a subsistence way of life. two formerly used defense sites (fuds) exist on the island, one of which, northeast cape, has been the subject of a $123 million cleanup effort. environmental monitoring demonstrates localized soil and watershed contamination with polychlorinated biphenyls (pcb), organochlorine (oc) pesti ... | 2015 | 26262441 |
| multiple occurrences of spiggin genes in sticklebacks. | the threespine stickleback (gasterosteus aculeatus) is known to have a unique reproductive mode including male nest-building with a secreted glue-like protein named spiggin. spiggin is a key character for studying the molecular mechanism in the evolution of this intriguing nest-building behavior, since the glue-like protein is essential for nest-building. however, it is unclear whether spiggin is encoded by a single gene or multiple genes; there are conflicting reports on this point. to resolve ... | 2006 | 16500044 |
| [development of the gill system in early ontogenesis of danio and nine spike stickleback]. | we studied specific features of development of the gill system during ontogenesis of the zebrafish danio rerio and ninespine stickleback pungitius pungitius, which differ in the rates of gill system, development. although the development of sticklebacks proceeds in nature at lower temperatures than for zebrafish, the rate of gill formation in the former is higher. these differences are related to the specific conditions in which these fish develop: embryonic and larval development of the stickle ... | 2006 | 11969071 |
| [2 new species of parasites of fish, myxobilatus schulmani sp. n. and apiosoma longiciliaris sp. n. of the water reservoirs of the kol'sk peninsula]. | two new species of parasitic protozoa are described, one of myxosporidia and the other of peritricha sessilia. myxobilatus schulmani sp. n. from pungitius pungitius is near to m. paragasterostei but differs from it by the rhombus form of the spore, by less dimension of polar capsules. the spore of m. shulmani is longer and less broader than that of m. paragasterostei. apiosoma longiciliaris sp. n. was found on the gills on esox lucius and phoxinus phoxinus. it is near to a. dallii but its micron ... | 2009 | 1187178 |
| the genetic and molecular architecture of phenotypic diversity in sticklebacks. | a major goal of evolutionary biology is to identify the genotypes and phenotypes that underlie adaptation to divergent environments. stickleback fish, including the threespine stickleback (gasterosteus aculeatus) and the ninespine stickleback (pungitius pungitius), have been at the forefront of research to uncover the genetic and molecular architecture that underlies phenotypic diversity and adaptation. a wealth of quantitative trait locus (qtl) mapping studies in sticklebacks have provided insi ... | 2017 | 27994127 |
| toward conservation of genetic and phenotypic diversity in japanese sticklebacks. | stickleback fishes have been established as a leading model system for studying the genetic mechanisms that underlie naturally occurring phenotypic diversification. because of the tremendous diversification achieved by stickleback species in various environments, different geographical populations have unique phenotypes and genotypes, which provide us with unique opportunities for evolutionary genetic research. among sticklebacks, japanese species have several unique characteristics that have no ... | 2016 | 27301281 |
| comparison of catch per unit effort among four minnow trap models in the three-spined stickleback (gasterosteus aculeatus) fishery. | minnow traps are commonly used in the stickleback (gasterostidae) fishery, but the potential differences in catch per unit effort (cpue) among different minnow trap models are little studied. we compared the cpue of four different minnow trap models in field experiments conducted with three-spined sticklebacks (gasterosteus aculeatus). marked (up to 26 fold) differences in median cpue among different trap models were observed. metallic uncoated traps yielded the largest cpue (2.8 fish/h), follow ... | 2015 | 26685761 |
| construction of ultradense linkage maps with lep-map2: stickleback f2 recombinant crosses as an example. | high-density linkage maps are important tools for genome biology and evolutionary genetics by quantifying the extent of recombination, linkage disequilibrium, and chromosomal rearrangements across chromosomes, sexes, and populations. they provide one of the best ways to validate and refine de novo genome assemblies, with the power to identify errors in assemblies increasing with marker density. however, assembly of high-density linkage maps is still challenging due to software limitations. we de ... | 2015 | 26668116 |
| consistent isotopic differences between schistocephalus spp. parasites and their stickleback hosts. | parasite-host systems show markedly variable patterns in isotopic fractionation: parasites can be either depleted or enriched in ¹⁵n and ¹³c as compared to their hosts. however, it remains unknown whether isotopic fractionation patterns are similar in comparable parasite-host systems from markedly different ecosystems. results of this study show that large-sized schistocephalus spp. endoparasites are consistently depleted in ¹⁵n (by on average -2.13 to -2.20 ‰) as compared to their nine-spined s ... | 2015 | 26203883 |
| geographic variation in age structure and longevity in the nine-spined stickleback (pungitius pungitius). | variation in age and size of mature nine-spined sticklebacks (pungitius pungitius) within and among 16 fennoscandian populations were assessed using skeletochronology. the average age of individuals in a given population varied from 1.7 to 4.7 years. fish from pond populations were on average older than those from lake and marine populations, and females tended to be older than males. reproduction in marine and lake populations commenced typically at an age of two years, whereas that in ponds at ... | 2014 | 25025183 |
| genomic divergence between nine- and three-spined sticklebacks. | comparative genomics approaches help to shed light on evolutionary processes that shape differentiation between lineages. the nine-spined stickleback (pungitius pungitius) is a closely related species of the ecological 'supermodel' three-spined stickleback (gasterosteus aculeatus). it is an emerging model system for evolutionary biology research but has garnered less attention and lacks extensive genomic resources. to expand on these resources and aid the study of sticklebacks in a phylogenetic ... | 2013 | 24188282 |
| genetic architecture of parallel pelvic reduction in ninespine sticklebacks. | teleost fish genomes are known to be evolving faster than those of other vertebrate taxa. thus, fish are suited to address the extent to which the same vs. different genes are responsible for similar phenotypic changes in rapidly evolving genomes of evolutionary independent lineages. to gain insights into the genetic basis and evolutionary processes behind parallel phenotypic changes within and between species, we identified the genomic regions involved in pelvic reduction in northern european n ... | 2013 | 23979937 |
| evaluating patterns of convergent evolution and trans-species polymorphism at mhc immunogenes in two sympatric stickleback species. | the immunologically important major histocompatibility complex (mhc) harbors some of the most polymorphic genes in vertebrates. these genes presumably evolve under parasite-mediated selection and frequently show inconsistent allelic genealogies, where some alleles are more similar between species than within species. this phenomenon is thought to arise either from convergent evolution under parallel selection or from the preservation of ancient allelic lineages beyond speciation events (trans-sp ... | 2013 | 23888860 |
| speciation in ninespine stickleback: reproductive isolation and phenotypic divergence among cryptic species of japanese ninespine stickleback. | although similar patterns of phenotypic diversification are often observed in phylogenetically independent lineages, differences in the magnitude and direction of phenotypic divergence have been also observed among independent lineages, even when exposed to the same ecological gradients. the stickleback family is a good model with which to explore the ecological and genetic basis of parallel and nonparallel patterns of phenotypic evolution, because there are a variety of populations and species ... | 2013 | 23663028 |
| nine-spined stickleback (pungitius pungitius): an emerging model for evolutionary biology research. | the nine-spined stickleback (pungitius pungitius) is emerging as a model for evolutionary biology, genetic, and behavioral research in the wake of its better-known relative, the three-spined stickleback (gasterosteus aculeatus). this interest has been fed by its fascinating biological features, such as the repeated evolution of similar phenotypes in isolated pond populations. a large body of recent research has uncovered the finding that pond nine-spined sticklebacks have evolved numerous morpho ... | 2013 | 23550583 |
| the evolutionary ecology of dwarfism in three-spined sticklebacks. | 1. body size is a defining phenotypic trait, but the ecological causes of its evolution are poorly understood. most studies have considered only a single putative causal agent and have failed to recognise that different environmental agents are often correlated. 2. darwin suggested that although trait variation across populations is often associated with abiotic variation, evolution is more likely to be driven by biotic factors correlated with the abiotic variation. this hypothesis has received ... | 2013 | 23237226 |
| molecular evolutionary and population genomic analysis of the nine-spined stickleback using a modified restriction-site-associated dna tag approach. | in recent years, the explosion of affordable next generation sequencing technology has provided an unprecedented opportunity to conduct genome-wide studies of adaptive evolution in organisms previously lacking extensive genomic resources. here, we characterize genome-wide patterns of variability and differentiation using pooled dna from eight populations of the nine-spined stickleback (pungitius pungitius l.) from marine, lake and pond environments. we developed a novel genome complexity reducti ... | 2013 | 22943747 |
| niche segregation in two closely related species of stickleback along a physiological axis: explaining multidecadal changes in fish distribution from iron-induced respiratory impairment. | acute exposure to iron can be lethal to fish, but long-term sublethal impacts of iron require further study. here we investigated whether the spatial and temporal distribution (1967-2004) of two closely related species of stickleback matched the spatial distribution of iron concentrations in the groundwater. we used the 'northern peel region', a historically iron-rich peat landscape in the netherlands as a case study. this allowed us to test the hypothesis that niche segregation in two closely r ... | 2017 | 25999780 |
| high degree of sex chromosome differentiation in stickleback fishes. | studies of closely related species with different sex chromosome systems can provide insights into the processes of sex chromosome differentiation and evolution. to investigate the potential utility of molecular markers in studying sex chromosome differentiation at early stages of their divergence, we examined the levels and patterns of genetic differentiation between sex chromosomes in nine-spined (pungitius pungitius) and three-spined sticklebacks (gasterosteus aculeatus) using microsatellite ... | 2011 | 21958112 |
| utility of sequenced genomes for microsatellite marker development in non-model organisms: a case study of functionally important genes in nine-spined sticklebacks (pungitius pungitius). | identification of genes involved in adaptation and speciation by targeting specific genes of interest has become a plausible strategy also for non-model organisms. we investigated the potential utility of available sequenced fish genomes to develop microsatellite (cf. simple sequence repeat, ssr) markers for functionally important genes in nine-spined sticklebacks (pungitius pungitius), as well as cross-species transferability of ssr primers from three-spined (gasterosteus aculeatus) to nine-spi ... | 2010 | 20507571 |
| evolution of gigantism in nine-spined sticklebacks. | the relaxation of predation and interspecific competition are hypothesized to allow evolution toward "optimal" body size in island environments, resulting in the gigantism of small organisms. we tested this hypothesis by studying a small teleost (nine-spined stickleback, pungitius pungitius) from four marine and five lake (diverse fish community) and nine pond (impoverished fish community) populations. in line with theory, pond fish tended to be larger than their marine or lake conspecifics, som ... | 2009 | 19624722 |
| the genetic architecture of skeletal convergence and sex determination in ninespine sticklebacks. | the history of life offers plentiful examples of convergent evolution, the independent derivation of similar phenotypes in distinct lineages. the emergence of convergent phenotypes among closely related lineages (frequently termed "parallel" evolution) is often assumed to result from changes in similar genes or developmental pathways, but the genetic origins of convergence remains poorly understood. ninespine (pungitius pungitius) and threespine (gasterosteus aculeatus) stickleback fish provide ... | 2009 | 19500990 |
| turnover of sex chromosomes in the stickleback fishes (gasterosteidae). | diverse sex-chromosome systems are found in vertebrates, particularly in teleost fishes, where different systems can be found in closely related species. several mechanisms have been proposed for the rapid turnover of sex chromosomes, including the transposition of an existing sex-determination gene, the appearance of a new sex-determination gene on an autosome, and fusions between sex chromosomes and autosomes. to better understand these evolutionary transitions, a detailed comparison of sex ch ... | 2009 | 19229325 |
| a receiver bias in the origin of three-spined stickleback mate choice. | receiver-bias models of signal evolution predict that male sexually selected traits evolve through prior selection for other functions. female three-spined sticklebacks (gasterosteus aculeatus) in many populations show a mating preference for males with a red throat and jaw. it has been proposed that this preference evolved because the choice of males with red coloration confers direct and indirect benefits to females in accordance with the fisher-zahavi model of sexual selection. we present ind ... | 2004 | 15255050 |
| species difference in adaptive use of public information in sticklebacks. | animals foraging on variable food sources can refine their estimates of patch quality by monitoring the success of others (i.e. collect 'public information'). here, we show that both three-spined sticklebacks (gasterosteus aculeatus) and nine-spined sticklebacks (pungitius pungitius) use past cues provided by others to locate food but only nine-spined sticklebacks use prior public information to assess patch quality, regardless of whether demonstrators were conspecifics or heterospecifics. moreo ... | 2003 | 14667359 |
| characterization and evolutionary relevance of the sperm nuclear basic proteins from stickleback fish. | we have characterized the sperm nuclear basic proteins (snbps) of the sticklebacks in the suborder gasterosteoidei. the complete amino acid sequence of the protamines from aulorhynchus flavidus, pungitius pungitius, gasterosteus aculeatus, (anadromous) and g. wheatlandi, as well as the sequences of the protamines of several species pairs of freshwater g. aculeatus, have been determined. analysis of the primary structure of these proteins has shown that: a) despite the relatively low amino acid c ... | 2000 | 10984419 |
| comparative study of the olfactory epithelium of the three-spined stickleback (gasterosteus aculeatus) and the nine-spined stickleback (pungitius pungitius). | the olfactory epithelium of the three-spined stickleback (gasterosteus aculeatus) and the nine-spined stickleback (pungitius pungitius) has been studied with a conventional histochemical and a novel immunological staining technique. in both species, the sensory epithelium is arranged in folds separated by non-sensory epithelial tissue. in the nine-spined stickleback, intrinsic folds consisting of non-sensory cells are found in the apical part of the sensory epithelium where they divide the surfa ... | 1992 | 1384977 |
| structure and development of sphaerospora elegans thélohan 1892 (myxozoa: myxosporea) in the sticklebacks gasterosteus aculeatus l. and pungitius pungitius l. (gasterosteidae). | the structure and development of sphaerospora elegans thélohan 1892 was studied by light and electron microscopy. specimens of gasterosteus aculeatus and pungitius pungitius were examined from localities in england, scotland and france. the kidney was found to be the main site of infection in both species, with a frequent co-infection with myxobilatus gasterostei (parisi, 1912) davis, 1944 present in several populations of g. aculeatus. possible extrasporogonic stages were located in the interst ... | 1991 | 23194759 |
| morphological studies on the growth hormone cells in the pituitary gland of the nine-spined stickleback, pungitius pungitius l. | base-line data is presented on growth hormone cells in adult, nine-spined sticklebacks, pungitius pungitius l. the cells are smallest in june-august, when adult animals are oldest and many large fish are dying. it may thus be the wrong time for seawater-transfer experiments designed to alter the secretory state of these cells. starving fish for 3.5-4 weeks in february and in september-october did not markedly affect growth hormone cell numbers, staining properties or size. a detailed morphometri ... | 1982 | 6897315 |
| description and morphological variability of neoechinorhynchus beringianus n. sp. (acanthocephala: neoechinorhynchidae) from north-eastern asia. | neoechinorhynchus beringianus sp. n. is described from pungitius pungitius l. in north-eastern russia. since 1986, when it was first found, it was reported as 'n. pungitius dechtiar, 1971'. however, this new species differs from the latter in having an egg shell without a prolongation of the fertilisation membrane, a larger proboscis and proboscis hooks, a subterminal position of the female genital pore and a more slender trunk, and it occurs in a different site in the intestine. n. beringianus ... | 2008 | 18661252 |
| neoechinorhynchus pungitius n. sp. (acanthocephala: neoechinorhynchidae) from ninespine stickleback of lake huron. | | 1971 | 5106577 |