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Cephalopods

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https://www.readbyqxmd.com/read/28344325/the-giant-deep-sea-octopus-haliphron-atlanticus-forages-on-gelatinous-fauna
#1
H J T Hoving, S H D Haddock
Feeding strategies and predator-prey interactions of many deep-sea pelagic organisms are still unknown. This is also true for pelagic cephalopods, some of which are very abundant in oceanic ecosystems and which are known for their elaborate behaviors and central role in many foodwebs. We report on the first observations of the giant deep-sea octopus Haliphron atlanticus with prey. Using remotely operated vehicles, we saw these giant octopods holding medusae in their arms. One of the medusae could be identified as Phacellophora camtschatica (the egg-yolk jelly)...
March 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28341528/molecular-diagnosis-of-allergy-to-anisakis-simplex-and-gymnorhynchus-gigas-fish-parasites
#2
A Armentia, J Santos, Z Serrano, B Martín, S Martín, J Barrio, S Fernández, M González-Sagrado, F Pineda, R Palacios
BACKGROUND: There has been an increase in the prevalence of hypersensitivity to Anisakis simplex. There are fish parasites other than Anisakis simplex whose allergenicity has not yet been studied. OBJECTIVE: To assess IgE hypersensitivity caused by fish parasite allergens in patients with gastro-allergic symptoms after consumption of fish, shellfish or cephalopods, compared with healthy subjects, pollen allergic individuals and children with digestive symptoms after eating marine food...
March 21, 2017: Allergologia et Immunopathologia
https://www.readbyqxmd.com/read/28335553/biosynthesis-of-polyunsaturated-fatty-acids-in-octopus-vulgaris-molecular-cloning-and-functional-characterisation-of-a-stearoyl-coa-desaturase-and-an-elongation-of-very-long-chain-fatty-acid-4-protein
#3
Óscar Monroig, Rosa de Llanos, Inmaculada Varó, Francisco Hontoria, Douglas R Tocher, Sergi Puig, Juan C Navarro
Polyunsaturated fatty acids (PUFAs) have been acknowledged as essential nutrients for cephalopods but the specific PUFAs that satisfy the physiological requirements are unknown. To expand our previous investigations on characterisation of desaturases and elongases involved in the biosynthesis of PUFAs and hence determine the dietary PUFA requirements in cephalopods, this study aimed to investigate the roles that a stearoyl-CoA desaturase (Scd) and an elongation of very long-chain fatty acid 4 (Elovl4) protein play in the biosynthesis of essential fatty acids (FAs)...
March 21, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28298896/spotmetrics-an-open-source-image-analysis-software-plugin-for-automatic-chromatophore-detection-and-measurement
#4
Stavros P Hadjisolomou, George El-Haddad
Coleoid cephalopods (squid, octopus, and sepia) are renowned for their elaborate body patterning capabilities, which are employed for camouflage or communication. The specific chromatic appearance of a cephalopod, at any given moment, is a direct result of the combined action of their intradermal pigmented chromatophore organs and reflecting cells. Therefore, a lot can be learned about the cephalopod coloration system by video recording and analyzing the activation of individual chromatophores in time. The fact that adult cephalopods have small chromatophores, up to several hundred thousand in number, makes measurement and analysis over several seconds a difficult task...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28290697/seafood-identification-in-multispecies-products-assessment-of-16srrna-cytb-and-coi-universal-primers-efficiency-as-a-preliminary-analytical-step-for-setting-up-metabarcoding-next-generation-sequencing-techniques
#5
Alice Giusti, Lara Tinacci, Carmen G Sotelo, Martina Marchetti, Alessandra Guidi, Wenjie Zheng, Andrea Armani
Few studies applying NGS have been conducted in the food inspection field, particularly on multispecies seafood products. A preliminary study screening the performance and the potential application in NGS analysis of 14 "universal primers" amplifying 16SrRNA, cytb, and COI genes in fish and cephalopods was performed. Species used in surimi preparation were chosen as target. An in silico analysis was conducted to test primers' coverage capacity by assessing mismatches (number and position) with the target sequences...
March 23, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28278369/single-and-multiple-mating-reduces-longevity-of-female-dumpling-squid-euprymna-tasmanica
#6
Amanda M Franklin, Devi Stuart-Fox
For many species, mating is a necessary yet costly activity. The costs involved can have an important influence on the evolution of life histories and senescence. Females of many species mate multiply and this behaviour can inflict a longevity cost. Most studies investigating the effects of multiple mating on female survival have been conducted on insects and the effects in other taxa are largely unknown. We investigate the effects of both a single mating and a second mating on longevity in female dumpling squid (Euprymna tasmanica), a species in which both sexes mate multiply...
March 9, 2017: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/28263544/smart-actuators-and-adhesives-for-reconfigurable-matter
#7
Hyunhyub Ko, Ali Javey
Biological systems found in nature provide excellent stimuli-responsive functions. The camouflage adaptation of cephalopods (octopus, cuttlefish), rapid stiffness change of sea cucumbers, opening of pine cones in response to humidity, and rapid closure of Venus flytraps upon insect touch are some examples of nature's smart systems. Although current technologies are still premature to mimic these sophisticated structures and functions in smart biological systems, recent work on stimuli-responsive programmable matter has shown great progress...
March 6, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28253300/the-pax-gene-family-highlights-from-cephalopods
#8
Sandra Navet, Auxane Buresi, Sébastien Baratte, Aude Andouche, Laure Bonnaud-Ponticelli, Yann Bassaglia
Pax genes play important roles in Metazoan development. Their evolution has been extensively studied but Lophotrochozoa are usually omitted. We addressed the question of Pax paralog diversity in Lophotrochozoa by a thorough review of available databases. The existence of six Pax families (Pax1/9, Pax2/5/8, Pax3/7, Pax4/6, Paxβ, PoxNeuro) was confirmed and the lophotrochozoan Paxβ subfamily was further characterized. Contrary to the pattern reported in chordates, the Pax2/5/8 family is devoid of homeodomain in Lophotrochozoa...
2017: PloS One
https://www.readbyqxmd.com/read/28250188/molecular-clocks-indicate-turnover-and-diversification-of-modern-coleoid-cephalopods-during-the-mesozoic-marine-revolution
#9
Alastair R Tanner, Dirk Fuchs, Inger E Winkelmann, M Thomas P Gilbert, M Sabrina Pankey, Ângela M Ribeiro, Kevin M Kocot, Kenneth M Halanych, Todd H Oakley, Rute R da Fonseca, Davide Pisani, Jakob Vinther
Coleoid cephalopod molluscs comprise squid, cuttlefish and octopuses, and represent nearly the entire diversity of modern cephalopods. Sophisticated adaptations such as the use of colour for camouflage and communication, jet propulsion and the ink sac highlight the unique nature of the group. Despite these striking adaptations, there are clear parallels in ecology between coleoids and bony fishes. The coleoid fossil record is limited, however, hindering confident analysis of the tempo and pattern of their evolution...
March 15, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28248970/an-eocene-orthocone-from-antarctica-shows-convergent-evolution-of-internally-shelled-cephalopods
#10
Larisa A Doguzhaeva, Stefan Bengtson, Marcelo A Reguero, Thomas Mörs
BACKGROUND: The Subclass Coleoidea (Class Cephalopoda) accommodates the diverse present-day internally shelled cephalopod mollusks (Spirula, Sepia and octopuses, squids, Vampyroteuthis) and also extinct internally shelled cephalopods. Recent Spirula represents a unique coleoid retaining shell structures, a narrow marginal siphuncle and globular protoconch that signify the ancestry of the subclass Coleoidea from the Paleozoic subclass Bactritoidea. This hypothesis has been recently supported by newly recorded diverse bactritoid-like coleoids from the Carboniferous of the USA, but prior to this study no fossil cephalopod indicative of an endochochleate branch with an origin independent from subclass Bactritoidea has been reported...
2017: PloS One
https://www.readbyqxmd.com/read/28246643/unexpected-early-triassic-marine-ecosystem-and-the-rise-of-the-modern-evolutionary-fauna
#11
Arnaud Brayard, L J Krumenacker, Joseph P Botting, James F Jenks, Kevin G Bylund, Emmanuel Fara, Emmanuelle Vennin, Nicolas Olivier, Nicolas Goudemand, Thomas Saucède, Sylvain Charbonnier, Carlo Romano, Larisa Doguzhaeva, Ben Thuy, Michael Hautmann, Daniel A Stephen, Christophe Thomazo, Gilles Escarguel
In the wake of the end-Permian mass extinction, the Early Triassic (~251.9 to 247 million years ago) is portrayed as an environmentally unstable interval characterized by several biotic crises and heavily depauperate marine benthic ecosystems. We describe a new fossil assemblage-the Paris Biota-from the earliest Spathian (middle Olenekian, ~250.6 million years ago) of the Bear Lake area, southeastern Idaho, USA. This highly diversified assemblage documents a remarkably complex marine ecosystem including at least seven phyla and 20 distinct metazoan orders, along with algae...
February 2017: Science Advances
https://www.readbyqxmd.com/read/28241059/exceptionally-prolonged-tooth-formation-in-elasmosaurid-plesiosaurians
#12
Benjamin P Kear, Dennis Larsson, Johan Lindgren, Martin Kundrát
Elasmosaurid plesiosaurians were globally prolific marine reptiles that dominated the Mesozoic seas for over 70 million years. Their iconic body-plan incorporated an exceedingly long neck and small skull equipped with prominent intermeshing 'fangs'. How this bizarre dental apparatus was employed in feeding is uncertain, but fossilized gut contents indicate a diverse diet of small pelagic vertebrates, cephalopods and epifaunal benthos. Here we report the first plesiosaurian tooth formation rates as a mechanism for servicing the functional dentition...
2017: PloS One
https://www.readbyqxmd.com/read/28237403/marine-gametes-in-a-changing-ocean-impacts-of-climate-change-stressors-on-fecundity-and-the-egg
#13
Shawna A Foo, Maria Byrne
In marine invertebrates, the environmental history of the mother can influence fecundity and egg size. Acclimation of females in climate change stressors, increased temperature and low pH, results in a decrease in egg number and size in many taxa, with the exception of cephalopods, where eggs increase in size. With respect to spawned eggs, near future levels of ocean acidification can interfere with the egg's block to polyspermy and intracellular pH. Reduction of the extracellular egg jelly coat seen in low pH conditions has implications for impaired egg function and fertilization...
February 17, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28229261/revision-of-neolebouria-gibson-1976-digenea-opecoelidae-with-trilobovarium-n-g-for-species-infecting-tropical-and-subtropical-shallow-water-fishes
#14
Storm B Martin, Scott C Cutmore, Thomas H Cribb
A new opecoelid trematode is reported from fishes of the Lethrinidae, Lutjanidae and Nemipteridae off Lizard Island on the northern Great Barrier Reef, Australia. The new species keys to Neolebouria Gibson, 1976 and shows strong similarity to several species of that genus, but is not consistent with the type-species, N. georgiensis Gibson, 1976, or others known from temperate/polar and/or deep-sea fishes. The new species is also phylogenetically distant from N. lanceolata (Price, 1934) Reimer, 1987, the only representative of the genus for which molecular data are available...
March 2017: Systematic Parasitology
https://www.readbyqxmd.com/read/28220075/visual-equivalence-and-amodal-completion-in-cuttlefish
#15
I-Rong Lin, Chuan-Chin Chiao
Modern cephalopods are notably the most intelligent invertebrates and this is accompanied by keen vision. Despite extensive studies investigating the visual systems of cephalopods, little is known about their visual perception and object recognition. In the present study, we investigated the visual processing of the cuttlefish Sepia pharaonis, including visual equivalence and amodal completion. Cuttlefish were trained to discriminate images of shrimp and fish using the operant conditioning paradigm. After cuttlefish reached the learning criteria, a series of discrimination tasks were conducted...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28218427/two-vitellogenins-in-the-loliginid-squid-uroteuthis-edulis-identification-and-specific-expression-in-ovarian-follicles
#16
Hajime Kitano, Naoki Nagano, Keishi Sakaguchi, Michiya Matsuyama
Vitellogenenesis is a physiological process common in oviparous animals. The molecular profile, modifications, and utilization of vitellogenin (VTG), a precursor of yolk protein, have been characterized in various taxa to understand oogenesis within different modes of reproduction. Hormonal regulation of VTGs has been investigated in invertebrates, such as insects and crustaceans; conversely, little is known for cephalopods. In this study, we isolated two VTG genes (ue-VTG1 and ue-VTG2) from the loliginid swordtip squid, Uroteuthis edulis, via a comprehensive survey of a transcriptome database and subsequent cDNA cloning...
February 20, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28214715/metal-bioaccumulation-and-detoxification-processes-in-cephalopods-a-review
#17
REVIEW
Virginie Penicaud, Thomas Lacoue-Labarthe, Paco Bustamante
In recent decades, cephalopods have been shown to have very high capacities to accumulate most trace elements, regardless of whether they are essential (e.g., Cu and Zn) or non-essential (e.g., Ag and Cd). Among the different pathways of exposure to trace elements, the trophic pathway appears to be the major route of assimilation for numerous metals, including Cd, Co, Hg and Zn. Once assimilated, trace elements are distributed in the organism, accumulating in storage organs. The digestive gland is the main organ in which many trace elements accumulate, whichever of the exposure pathway...
May 2017: Environmental Research
https://www.readbyqxmd.com/read/28123096/deep-conservation-of-bivalve-nacre-proteins-highlighted-by-shell-matrix-proteomics-of-the-unionoida-elliptio-complanata-and-villosa-lienosa
#18
Benjamin Marie, Jaison Arivalagan, Lucrèce Mathéron, Gérard Bolbach, Sophie Berland, Arul Marie, Frédéric Marin
The formation of the molluscan shell nacre is regulated to a large extent by a matrix of extracellular macromolecules that are secreted by the shell-forming tissue, the mantle. This so-called 'calcifying matrix' is a complex mixture of proteins, glycoproteins and polysaccharides that is assembled and occluded within the mineral phase during the calcification process. Better molecular-level characterization of the substances that regulate nacre formation is still required. Notable advances in expressed tag sequencing of freshwater mussels, such as Elliptio complanata and Villosa lienosa, provide a pre-requisite to further characterize bivalve nacre proteins by a proteomic approach...
January 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28123014/mosaic-organization-of-body-pattern-control-in-the-optic-lobe-of-squids
#19
Tsung-Han Liu, Chuan-Chin Chiao
Cephalopods in nature undergo highly dynamic skin coloration changes that allow rapid camouflage and intraspecies communication. The optic lobe is thought to play a key role in controlling the expansion of the chromatophores that generate these diverse body patterns. However, the functional organization of the optic lobe and neural control of the various body patterns by the optic lobe are largely unknown. We applied electrical stimulation within the optic lobe to investigate the neural basis of body patterning in the oval squid, Sepioteuthis lessoniana Most areas in the optic lobe mediated predominately ipsilateral expansion of chromatophores present on the mantle, but not on the head and arms; furthermore, the expanded areas after electrical stimulation were positively correlated with an increase in stimulating voltage and stimulation depth...
January 25, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28098211/deep-sea-crustacean-trawling-fisheries-in-portugal-quantification-of-effort-and-assessment-of-landings-per-unit-effort-using-a-vessel-monitoring-system-vms
#20
Juan Bueno-Pardo, Sofia P Ramalho, Ana García-Alegre, Mariana Morgado, Rui P Vieira, Marina R Cunha, Henrique Queiroga
Mapping and quantifying bottom trawling fishing pressure on the seafloor is pivotal to understand its effects on deep-sea benthic habitats. Using data from the Vessel Monitoring System of crustacean trawlers along the Portuguese margin, we have identified the most exploited areas and characterized the most targeted habitats and water depths. We estimated a total trawling effort of 69596, 66766, and 63427 h y(-1) for the years 2012, 2013, and 2014 respectively which, considering the total landings estimated for this gear, yield values of 20...
January 18, 2017: Scientific Reports
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