| occurrence of tetrodotoxin-binding high molecular weight substances in the body fluid of shore crab (hemigrapsus sanguineus). | the shore crab (hemigrapsus sanguineus) is highly resistant to tetrodotoxin (ttx) although it contains no detectable amount of ttx (less than 5 mu/g, where 1 mu is defined as the amount of ttx killing a 20 g mouse in 30 min). its body fluid was examined for neutralizing effects against the lethal activity of ttx. when the mixture of the body fluid and ttx was injected i.p. into mice, the lethal activity of ttx was significantly reduced; 1 ml of the body fluid was evaluated to neutralize 3.6-4.0 ... | 1992 | 1488761 |
| phylogenetic study of the oxytocin-like immunoreactive system in invertebrates. | 1. a phylogenetic study of oxytocin (oxt)-like immunoreactive cells was performed by the pap method in the central nervous system of invertebrates. 2. the immunoreactivity was detected in the nerve cells of hydra magnipapillata of the coelenterata; neanthes japonica and pheretima communissima of the annelida; oncidium verrucosum, limax marginatus and meretrix lamarckii of the mollusca; and baratha brassica of the arthropoda. 3. no immunoreactive cells were found in bipalium sp. of the platyhelmi ... | 1988 | 2907439 |
| phylogenetic study of the arginine-vasotocin/arginine-vasopressin-like immunoreactive system in invertebrates. | 1. a phylogenetic study of arg-vasotocin (avt)/arg-vasopressin (avp)-like immunoreactive cells was performed by the pap method in the central nervous system of invertebrates. 2. the immunoreactivity was detected in the nerve cells of hydra magnipapillata of the coelenterata; neanthes japonica and pheretima communissima of the annelida; pomacea canaliculata, aplysia kurodai, oncidium verrucosum, bradybaena similaris, achatina fulica, limax marginatus and meretrix lamarckii of the mollusca; gnorim ... | 1988 | 2907440 |
| a tetrodotoxin-binding protein in the hemolymph of shore crab hemigrapsus sanguineus: purification and properties. | the shore crab hemigrapsus sanguineus hemolymph contains soluble proteins that bind tetrodotoxin (ttx) and are responsible for high resistance of the crab to ttx. the ttx-binding protein was purified from the hemolymph by ultrafiltration, lectin affinity chromatography and gel filtration hplc. the purified protein gave only one band in native-polyacrylamide gel electrophoresis (page), confirming its homogeneity. its molecular weight was estimated to be about 400k by gel filtration hplc, while it ... | 2002 | 12175612 |
| vasa-related genes and their expression in stem cells of colonial parasitic rhizocephalan barnacle polyascus polygenea (arthropoda: crustacea: cirripedia: rhizocephala). | vasa (vas)-related genes are members of the dead-box protein family and are expressed in the germ cells of many metazoa. we cloned vasa-related genes (ppvlg, cpvlg) and other dead-box family related genes (ppdrh1, ppdrh2, cpdrh, atdrhr) from the colonial parasitic rhizocephalan barnacle polyascus polygenea, the non-colonial clistosaccus paguri (crustacea: cirripedia: rhizocephala), and the parasitic isopodan athelgis takanoshimensis (crustacea: isopoda). the colonial polyascus polygenea, a paras ... | 2007 | 17085060 |
| discovery of maritrema jebuensis n. sp. (digenea: microphallidae) from the asian shore crab, hemigrapsus sanguineus, in korea. | maritrema spp. (digenea: microphallidae) are parasites of birds, but have not been found in the republic of korea. in this study, metacercariae of maritrema sp. were discovered in the asian shore crab, hemigrapsus sanguineus, caught in the mud-flats of jebu-do, hwasung-gun, gyeonggi-do, and the adult flukes were confirmed by experimental infection into mice. based on the symmetric ribbon-like vitellarium, adult flukes of maritrema sp. were identified, but did not belong to previously described s ... | 2010 | 21234238 |
| Permanent Genetic Resources added to Molecular Ecology Resources Database 1 August 2011-30 September 2011. | This article documents the addition of 299 microsatellite marker loci and nine pairs of single-nucleotide polymorphism (SNP) EPIC primers to the Molecular Ecology Resources (MER) Database. Loci were developed for the following species: Alosa pseudoharengus, Alosa aestivalis, Aphis spiraecola, Argopecten purpuratus, Coreoleuciscus splendidus, Garra gotyla, Hippodamia convergens, Linnaea borealis, Menippe mercenaria, Menippe adina, Parus major, Pinus densiflora, Portunus trituberculatus, Procontar ... | 2012 | 22136175 |
| community shelter use in response to two benthic decapod predators in the long island sound. | to investigate community shelter effects of two invasive decapod species, hemigrapsus sanguineus and carcinus maenas, in the long island sound (lis), we deployed artificial shelters in the intertidal and immediate subtidal zones. these consisted of five groups during the summer: a control, a resident h. sanguineus male or female group, and a resident c. maenas male or female group. we quantified utilization of the shelters at 24 h by counting crabs and fish present. we found significant avoidanc ... | 2016 | 27547570 |
| scaling the consequences of interactions between invaders from the individual to the population level. | the impact of human-induced stressors, such as invasive species, is often measured at the organismal level, but is much less commonly scaled up to the population level. interactions with invasive species represent an increasingly common source of stressor in many habitats. however, due to the increasing abundance of invasive species around the globe, invasive species now commonly cause stresses not only for native species in invaded areas, but also for other invasive species. i examine the europ ... | 2016 | 26929814 |
| abundance of non-native crabs in intertidal habitats of new england with natural and artificial structure. | marine habitats containing complex physical structure (e.g., crevices) can provide shelter from predation for benthic invertebrates. to examine effects of natural and artificial structure on the abundance of intertidal juvenile crabs, 2 experiments were conducted in kingston bay, massachusetts, usa, from july to september, 2012. in the first experiment, structure was manipulated in a two-factor design that was placed in the high intertidal for 3 one-week periods to test for both substrate type ( ... | 2015 | 26401456 |
| hemigrapsus sanguineus in long island salt marshes: experimental evaluation of the interactions between an invasive crab and resident ecosystem engineers. | the invasive asian shore crab, hemigrapsus sanguineus, has recently been observed occupying salt marshes, a novel environment for this crab species. as it invades this new habitat, it is likely to interact with a number of important salt marsh species. to understand the potential effects of h. sanguineus on this ecosystem, interactions between this invasive crab and important salt marsh ecosystem engineers were examined. laboratory experiments demonstrated competition for burrows between h. sang ... | 2014 | 25071995 |
| species invasion shifts the importance of predator dependence. | the strength of interference between foraging individuals can influence per capita consumption rates, with important consequences for predator and prey populations and system stability. here we demonstrate how the replacement of a previously established invader, the predatory crab carcinus maenas, by the recently invading predatory crab hemigrapsus sanguineus shifts predation from a species that experiences strong predator interference (strong predator dependence) to one that experiences weak pr ... | 2007 | 18229836 |
| inhibition between invasives: a newly introduced predator moderates the impacts of a previously established invasive predator. | 1. with continued globalization, species are being transported and introduced into novel habitats at an accelerating rate. interactions between invasive species may provide important mechanisms that moderate their impacts on native species. 2. the european green crab carcinus maenas is an aggressive predator that was introduced to the east coast of north america in the mid-1800 s and is capable of rapid consumption of bivalve prey. a newer invasive predator, the asian shore crab hemigrapsus sang ... | 2008 | 18177327 |
| influence of predator density on nonindependent effects of multiple predator species. | interactions between multiple predator species are frequent in natural communities and can have important implications for shared prey survival. predator density may be an important component of these interactions between predator species, as the frequency of interactions between species is largely determined by species density. here we experimentally examine the importance of predator density for interactions between predator species and subsequent impacts on prey. we show that aggressive inter ... | 2008 | 17968591 |
| intraguild predation reduces redundancy of predator species in multiple predator assemblage. | 1. interference between predator species frequently decreases predation rates, lowering the risk of predation for shared prey. however, such interference can also occur between conspecific predators. 2. therefore, to understand the importance of predator biodiversity and the degree that predator species can be considered functionally interchangeable, we determined the degree of additivity and redundancy of predators in multiple- and single-species combinations. 3. we show that interference betwe ... | 2006 | 17009759 |
| divergent induced responses to an invasive predator in marine mussel populations. | invasive species may precipitate evolutionary change in invaded communities. in southern new england (usa) the invasive asian shore crab, hemigrapsus sanguineus, preys on mussels (mytlius edulis), but the crab has not yet invaded northern new england. we show that southern new england mussels express inducible shell thickening when exposed to waterborne cues from hemigrapsus, whereas naïve northern mussel populations do not respond. yet, both populations thicken their shells in response to a lon ... | 2006 | 16902136 |
| partitioning mechanisms of predator interference in different habitats. | prey are often consumed by multiple predator species. predation rates on shared prey species measured in isolation often do not combine additively due to interference or facilitation among the predator species. furthermore, the strength of predator interactions and resulting prey mortality may change with habitat type. we experimentally examined predation on amphipods in rock and algal habitats by two species of intertidal crabs, hemigrapsus sanguineus (top predators) and carcinus maenas (interm ... | 2006 | 16086166 |
| laboratory investigations of the effects of predator sex and size on prey selection by the asian crab, hemigrapsus sanguineus. | laboratory studies have shown that the nonindigenous asian shore crab, hemigrapsus sanguineus, readily consumes three species of commercial bivalves: blue mussels, mytilus edulis, soft-shell clams, mya arenaria, and oysters, crassostrea virginica. although crabs can eat bivalves of a wide size range, they preferred the smaller prey (</=10 mm sl). prey critical size limits exist for m. edulis and c. virginica, but not m. arenaria, possibly because of differences in shell characteristics among the ... | 2001 | 11445087 |