Base de dados : MEDLINE
Pesquisa : B01.050.500.644.116 [Categoria DeCS]
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[PMID]:28989097
[Au] Autor:Lindgren AR; Anderson FE
[Ad] Endereço:The Center for Life in Extreme Environments, Department of Biology, Portland State University, 1719 SW 10th Ave, SRTC Rm 246, Portland, OR 97201, USA. Electronic address: arl3@pdx.edu.
[Ti] Título:Assessing the utility of transcriptome data for inferring phylogenetic relationships among coleoid cephalopods.
[So] Source:Mol Phylogenet Evol;118:330-342, 2018 Jan.
[Is] ISSN:1095-9513
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Historically, deep-level relationships within the molluscan class Cephalopoda (squids, cuttlefishes, octopods and their relatives) have remained elusive due in part to the considerable morphological diversity of extant taxa, a limited fossil record for species that lack a calcareous shell and difficulties in sampling open ocean taxa. Many conflicts identified by morphologists in the early 1900s remain unresolved today in spite of advances in morphological, molecular and analytical methods. In this study we assess the utility of transcriptome data for resolving cephalopod phylogeny, with special focus on the orders of Decapodiformes (open-eye squids, bobtail squids, cuttlefishes and relatives). To do so, we took new and previously published transcriptome data and used a unique cephalopod core ortholog set to generate a dataset that was subjected to an array of filtering and analytical methods to assess the impacts of: taxon sampling, ortholog number, compositional and rate heterogeneity and incongruence across loci. Analyses indicated that datasets that maximized taxonomic coverage but included fewer orthologs were less stable than datasets that sacrificed taxon sampling to increase the number of orthologs. Clades recovered irrespective of dataset, filtering or analytical method included Octopodiformes (Vampyroteuthis infernalis + octopods), Decapodiformes (squids, cuttlefishes and their relatives), and orders Oegopsida (open-eyed squids) and Myopsida (e.g., loliginid squids). Ordinal-level relationships within Decapodiformes were the most susceptible to dataset perturbation, further emphasizing the challenges associated with uncovering relationships at deep nodes in the cephalopod tree of life.
[Mh] Termos MeSH primário: Cefalópodes/classificação
Transcriptoma
[Mh] Termos MeSH secundário: Animais
Teorema de Bayes
Cefalópodes/genética
Decapodiformes/classificação
Decapodiformes/genética
Fósseis
Funções Verossimilhança
Filogenia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180220
[Lr] Data última revisão:
180220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171010
[St] Status:MEDLINE


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[PMID]:28873395
[Au] Autor:Peristeraki P; Tserpes G; Lampadariou N; Stergiou KI
[Ad] Endereço:Institute of Marine Biological Resources and Inland Waters, Hellenic Centre for Marine Research, Heraklion, Crete, Greece.
[Ti] Título:Comparing demersal megafaunal species diversity along the depth gradient within the South Aegean and Cretan Seas (Eastern Mediterranean).
[So] Source:PLoS One;12(9):e0184241, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Knowledge on biodiversity patterns of demersal megafaunal species in the Mediterranean and particularly in its eastern basin is still very scarce. In the present study, fine-scale diversity patterns in relation to depth were analyzed for three major megafaunal groups (fish, cephalopods and crustaceans) in three subareas of the eastern Mediterranean (Crete, Cyclades and Dodecanese islands). The analysis was based on data from the Mediterranean International Trawl Survey conducted during 2005-2014 and the relationship between depth and two different diversity measures (species richness and Shannon-Weaver) was examined using Generalized Additive Modeling (GAM) techniques. Species richness of fish decreased with depth in two of the three subareas (Cyclades, Dodecanese), while the opposite was true for crustaceans in all subareas. Cephalopods had higher species richness at intermediate depths, near the shelf break. Significant differences among subareas were found, with Crete showing a distinct species richness-depth pattern, which was more obvious for fish and cephalopods. The differences among subareas were also highlighted based on the occurrence of alien species of Indo-Pacific origin, which were more frequent in Crete. Our results suggested that the importance of depth-related factors in structuring communities was higher for cephalopods and less important for fish, and that Crete showed a distinct diversity-depth relationship, a fact that can be attributed to its specific geographical and oceanographic characteristics. These results support the current GFCM/FAO's characterization of Crete as a unique geographic subarea. The findings of the study contribute to understanding the causes of underlying diversity patterns and would assist various environmental management actions, particularly those related to the establishment of marine-protected areas.
[Mh] Termos MeSH primário: Biodiversidade
Cefalópodes/fisiologia
Crustáceos/fisiologia
Peixes/fisiologia
Oceanos e Mares
[Mh] Termos MeSH secundário: Animais
Geografia
Região do Mediterrâneo
Modelos Teóricos
Especificidade da Espécie
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171016
[Lr] Data última revisão:
171016
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170906
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0184241


  3 / 228 MEDLINE  
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[PMID]:28727800
[Au] Autor:Saunders WB; Greenfest-Allen E; Ward PD
[Ad] Endereço:Department of Geology, Bryn Mawr College, Bryn Mawr, Pennsylvania, United States of America.
[Ti] Título:Demographic disequilibrium in living nautiloids (Nautilus and Allonautilus): Canary in the coal mines?
[So] Source:PLoS One;12(7):e0179811, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Averaged demographic data from previously unfished populations of Nautilus and Allonautilus (Cephalopoda) provide a baseline to determine if a population is undisturbed and in "equilibrium" or is in "disequilibrium" as a result of fishery pressure. Data are available for previously undisturbed local nautiloid populations in Papua New Guinea, Australia, Indonesia, Fiji, Palau, American Samoa, New Caledonia and Vanuatu (total n = 2,669 live-caught, tagged and released animals). The data show that unfished populations average ~75% males and ~74% mature animals. By contrast, unpublished, anecdotal and historical records since 1900 from the heavily fished central Philippines have shown a persistent decline in trap yields and a change in demographics of N. pompilius. By 1979, a sample of fished live-caught animals (n = 353) comprised only ~28% males and ~27% mature animals. Continued uncontrolled trapping caused collapse of the fishery and the shell industry has moved elsewhere, including Indonesia. In addition, we show that estimated rates of population decline are offered by unpublished tag-release records in unfished Palau. These data show that patterns of trap yields and demographic differences between fished and unfished populations in relative age class and sex ratios can indicate disequilibria wrought by fisheries pressure that can render local populations inviable. Given adequate samples (n ≥100 live-caught animals), a threshold of <50% males and mature animals in fished populations should signal the need to initiate curative conservation initiatives. The current trajectory of uncontrolled nautiloid fisheries can only mean trouble and possibly extinction of local populations of this ancient, iconic molluscan lineage.
[Mh] Termos MeSH primário: Cefalópodes
Conservação dos Recursos Naturais
Pesqueiros
[Mh] Termos MeSH secundário: Distribuição Animal
Animais
Austrália
Feminino
Masculino
Nautilus
Ilhas do Pacífico
Dinâmica Populacional
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170927
[Lr] Data última revisão:
170927
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170721
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0179811


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[PMID]:28388405
[Au] Autor:Liscovitch-Brauer N; Alon S; Porath HT; Elstein B; Unger R; Ziv T; Admon A; Levanon EY; Rosenthal JJ; Eisenberg E
[Ad] Endereço:Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel.
[Ti] Título:Trade-off between Transcriptome Plasticity and Genome Evolution in Cephalopods.
[So] Source:Cell;169(2):191-202.e11, 2017 Apr 06.
[Is] ISSN:1097-4172
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:RNA editing, a post-transcriptional process, allows the diversification of proteomes beyond the genomic blueprint; however it is infrequently used among animals for this purpose. Recent reports suggesting increased levels of RNA editing in squids thus raise the question of the nature and effects of these events. We here show that RNA editing is particularly common in behaviorally sophisticated coleoid cephalopods, with tens of thousands of evolutionarily conserved sites. Editing is enriched in the nervous system, affecting molecules pertinent for excitability and neuronal morphology. The genomic sequence flanking editing sites is highly conserved, suggesting that the process confers a selective advantage. Due to the large number of sites, the surrounding conservation greatly reduces the number of mutations and genomic polymorphisms in protein-coding regions. This trade-off between genome evolution and transcriptome plasticity highlights the importance of RNA recoding as a strategy for diversifying proteins, particularly those associated with neural function. PAPERCLIP.
[Mh] Termos MeSH primário: Evolução Biológica
Cefalópodes/genética
Edição de RNA
Transcriptoma
[Mh] Termos MeSH secundário: Adenosina Desaminase/metabolismo
Sequência de Aminoácidos
Animais
Cefalópodes/classificação
Cefalópodes/metabolismo
Sistema Nervoso/metabolismo
Canais de Potássio de Abertura Dependente da Tensão da Membrana/química
Canais de Potássio de Abertura Dependente da Tensão da Membrana/genética
Alinhamento de Sequência
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Potassium Channels, Voltage-Gated); EC 3.5.4.4 (Adenosine Deaminase)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170714
[Lr] Data última revisão:
170714
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170408
[St] Status:MEDLINE


  5 / 228 MEDLINE  
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[PMID]:28372850
[Au] Autor:Diluzio AR; Baliga VB; Higgins BA; Mehta RS
[Ad] Endereço:Department of Ecology and Evolutionary Biology, Long Marine Laboratory, University of California Santa Cruz, Santa Cruz, CA 95060, USA.
[Ti] Título:Effects of prey characteristics on the feeding behaviors of an apex marine predator, the California moray (Gymnothorax mordax).
[So] Source:Zoology (Jena);122:80-89, 2017 Jun.
[Is] ISSN:1873-2720
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Moray eels comprise a large radiation of elongate marine predators that are thought to swallow large prey whole but also circumvent gape constraints by manipulating prey into more manageable pieces. Prey manipulation behaviors include shaking, rotation, knotting, and ramming prey against another object to assist in swallowing. Most morays feed on a wide variety of prey that vary in mechanical properties such as stiffness and toughness, which could potentially affect feeding behaviors. There is little diet data informing us of the maximum prey size morays can swallow whole and whether maximum prey size differs between prey types. Our study examines feeding behaviors for the California moray (Gymnothorax mordax) in the laboratory. We recorded morays feeding on freshly thawed fish and cephalopods of varying size. We found that prey size had a strong effect on total feeding time and manipulation duration for both fish and cephalopods. While morays were observed using a diversity of prey manipulation behaviors and the durations for each of these behaviors increased with prey size, prey type had no effect on manipulation behaviors employed. Total manipulation duration, however, comprised a greater proportion of total feeding time for fish compared to cephalopods. As relative prey mass (RPM) increased for cephalopods, morays spent a greater proportion of their total feeding time transporting prey. Transport rate was higher for cephalopod prey but the relationship between RPM and transport rate was negative for both prey types. Despite this decrease in transport rate, we attribute the lower total feeding times for larger cephalopod prey compared to fish to behavioral tactics of morays. Morays used the corners of the aquaria to aid in the transport of larger cephalopod prey. We hypothesize that the deformable tissues of cephalopods and the presumably low coefficient of friction of their thawed mantles and tentacles may be difficult for the recurved teeth on the pharyngeal jaws to pierce and grip during transport.
[Mh] Termos MeSH primário: Enguias/fisiologia
Comportamento Predatório/fisiologia
[Mh] Termos MeSH secundário: Animais
Fenômenos Biomecânicos
Tamanho Corporal
Cefalópodes
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170915
[Lr] Data última revisão:
170915
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170405
[St] Status:MEDLINE


  6 / 228 MEDLINE  
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[PMID]:28253300
[Au] Autor:Navet S; Buresi A; Baratte S; Andouche A; Bonnaud-Ponticelli L; Bassaglia Y
[Ad] Endereço:UMR BOREA MNHN/CNRS7208/IRD207/UPMC/UCN/UA, Muséum National d'Histoire Naturelle, Sorbonne Universités, Paris, France.
[Ti] Título:The Pax gene family: Highlights from cephalopods.
[So] Source:PLoS One;12(3):e0172719, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo: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, Paxß, PoxNeuro) was confirmed and the lophotrochozoan Paxß subfamily was further characterized. Contrary to the pattern reported in chordates, the Pax2/5/8 family is devoid of homeodomain in Lophotrochozoa. Expression patterns of the three main pax classes (pax2/5/8, pax3/7, pax4/6) during Sepia officinalis development showed that Pax roles taken as ancestral and common in metazoans are modified in S. officinalis, most likely due to either the morphological specificities of cephalopods or to their direct development. Some expected expression patterns were missing (e.g. pax6 in the developing retina), and some expressions in unexpected tissues have been found (e.g. pax2/5/8 in dermal tissue and in gills). This study underlines the diversity and functional plasticity of Pax genes and illustrates the difficulty of using probable gene homology as strict indicator of homology between biological structures.
[Mh] Termos MeSH primário: Cefalópodes/genética
Fatores de Transcrição Box Pareados/genética
[Mh] Termos MeSH secundário: Animais
Alinhamento de Sequência
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Paired Box Transcription Factors)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170825
[Lr] Data última revisão:
170825
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170303
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0172719


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[PMID]:28248970
[Au] Autor:Doguzhaeva LA; Bengtson S; Reguero MA; Mörs T
[Ad] Endereço:Department of Palaeobiology, Swedish Museum of Natural History, Stockholm, Sweden.
[Ti] Título:An Eocene orthocone from Antarctica shows convergent evolution of internally shelled cephalopods.
[So] Source:PLoS One;12(3):e0172169, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo: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. METHODOLOGY/PRINCIPAL FINDINGS: Two orthoconic conchs were recovered from the Early Eocene of Seymour Island at the tip of the Antarctic Peninsula, Antarctica. They have loosely mineralized organic-rich chitin-compatible microlaminated shell walls and broadly expanded central siphuncles. The morphological, ultrustructural and chemical data were determined and characterized through comparisons with extant and extinct taxa using Scanning Electron Microscopy/Energy Dispersive Spectrometry (SEM/EDS). CONCLUSIONS/SIGNIFICANCE: Our study presents the first evidence for an evolutionary lineage of internally shelled cephalopods with independent origin from Bactritoidea/Coleoidea, indicating convergent evolution with the subclass Coleoidea. A new subclass Paracoleoidea Doguzhaeva n. subcl. is established for accommodation of orthoconic cephalopods with the internal shell associated with a broadly expanded central siphuncle. Antarcticerida Doguzhaeva n. ord., Antarcticeratidae Doguzhaeva n. fam., Antarcticeras nordenskjoeldi Doguzhaeva n. gen., n. sp. are described within the subclass Paracoleoidea. The analysis of organic-rich shell preservation of A. nordenskjoeldi by use of SEM/EDS techniques revealed fossilization of hyposeptal cameral soft tissues. This suggests that a depositional environment favoring soft-tissue preservation was the factor enabling conservation of the weakly mineralized shell of A. nordenskjoeldi.
[Mh] Termos MeSH primário: Evolução Biológica
Cefalópodes
Fósseis/ultraestrutura
[Mh] Termos MeSH secundário: Animais
Regiões Antárticas
Cefalópodes/classificação
Cefalópodes/fisiologia
Cefalópodes/ultraestrutura
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170302
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0172169


  8 / 228 MEDLINE  
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[PMID]:28214715
[Au] Autor:Penicaud V; Lacoue-Labarthe T; Bustamante P
[Ad] Endereço:Littoral Environnement et Sociétés (LIENSs), UMR 7266 CNRS-Université de La Rochelle, 2 rue Olympe de Gouges, 17000 La Rochelle, France.
[Ti] Título:Metal bioaccumulation and detoxification processes in cephalopods: A review.
[So] Source:Environ Res;155:123-133, 2017 05.
[Is] ISSN:1096-0953
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo: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. For example, this organ can present Cd concentrations reaching hundreds to thousands of ppm for some species, even though the digestive gland represents only a small proportion of the total mass of the animal. Such a specific organotropism towards the digestive gland of both essential and non-essential elements, regardless of the exposure pathway, poses the question of the detoxification processes evolved by cephalopods in order to sustain these high concentrations. This paper reviews the current knowledge on the bioaccumulation of trace elements in cephalopods, the differences in pharmaco-dynamics between organs and tissues, and the detoxification processes they use to counteract trace element toxicity. A peculiar focus has been done on the bioaccumulation within the digestive gland by investigating the subcellular locations of trace elements and their protein ligands.
[Mh] Termos MeSH primário: Cefalópodes/metabolismo
Metais/metabolismo
Poluentes Químicos da Água/metabolismo
[Mh] Termos MeSH secundário: Animais
Monitoramento Ambiental
Inativação Metabólica
Distribuição Tecidual
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Metals); 0 (Water Pollutants, Chemical)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:171119
[Lr] Data última revisão:
171119
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170220
[St] Status:MEDLINE


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[PMID]:27796978
[Au] Autor:Rabaoui L; El Zrelli R; Balti R; Mansour L; Courjault-Radé P; Daghbouj N; Tlig-Zouari S
[Ad] Endereço:Research Unit of Integrative Biology and Evolutionary and Functional Ecology of Aquatic Systems, Faculty of Science of Tunis, University of Tunis El Manar, B.P 94  Cité Rommana, University Campus, 1068, Tunis, Tunisia. lrabaoui@gmail.com.
[Ti] Título:Metal bioaccumulation in two edible cephalopods in the Gulf of Gabes, South-Eastern Tunisia: environmental and human health risk assessment.
[So] Source:Environ Sci Pollut Res Int;24(2):1686-1699, 2017 Jan.
[Is] ISSN:1614-7499
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Samples of Octopus vulgaris and Sepia officinalis were collected from four areas in the Gulf of Gabes, south-eastern Tunisia, and their edible tissues (mantle and arms) were analyzed for cadmium, copper, mercury, and zinc. While the concentrations of metals showed significant differences between the sampling sites, no differences were revealed between the tissues of the two species. The spatial distribution of metals analyzed showed similar pattern for both tissues of the two species, with the highest concentrations found in the central area of Gabes Gulf, and the lowest in the northern and/or southern areas. From a human health risk point of view, the highest values of estimated daily intake, target hazard quotient, and hazard index were found in the central area of Gabes Gulf. Although the results of these indices were, in general, not alarming, the health risks posed by the consumption of cephalopods on local consumers cannot be excluded.
[Mh] Termos MeSH primário: Cádmio/metabolismo
Cefalópodes/metabolismo
Mercúrio/metabolismo
[Mh] Termos MeSH secundário: Animais
Cádmio/análise
Cobre/análise
Cobre/metabolismo
Monitoramento Ambiental
Contaminação de Alimentos
Seres Humanos
Mercúrio/análise
Medição de Risco
Tunísia
Poluentes Químicos da Água/análise
Poluentes Químicos da Água/metabolismo
Zinco/análise
Zinco/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Water Pollutants, Chemical); 00BH33GNGH (Cadmium); 789U1901C5 (Copper); FXS1BY2PGL (Mercury); J41CSQ7QDS (Zinc)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:171104
[Lr] Data última revisão:
171104
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161101
[St] Status:MEDLINE
[do] DOI:10.1007/s11356-016-7945-x


  10 / 228 MEDLINE  
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[PMID]:27646066
[Au] Autor:von Byern J; Cyran N; Klepal W; Nödl MT; Klinger L
[Ad] Endereço:Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, Austrian Cluster for Tissue Regeneration, Donaueschingenstrasse 13, 1200 Vienna, Austria; Core Facility Cell Imaging and Ultrastructural Research, Faculty of Life Sciences, University of Vienna, Althanstrasse 14, 1090 Vienna, Aus
[Ti] Título:Characterization of the adhesive dermal secretion of Euprymna scolopes Berry, 1913 (Cephalopoda).
[So] Source:Zoology (Jena);120:73-82, 2017 Feb.
[Is] ISSN:1873-2720
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Bio-adhesion is a common and crucial process in nature and is used by several different species for camouflage, prey capture, hatching or to avoid drifting. Four genera of cephalopods belonging to four different families (Euprymna, Sepiolidae; Idiosepius, Idiosepiidae; Nautilus, Nautilidae; and Sepia, Sepiidae) produce glue for temporary attachment. Euprymna species live in near-shore benthic habitats of the Indo-Pacific Ocean, are nocturnal and bury into the seafloor during the day. The animals secrete adhesives through their epithelial glands to completely coat themselves with sand. In cases of danger, they instantaneously release the sandy coat as a sinking decoy to deflect predators. Earlier morphological investigations have shown that the adhesive gland cells of Euprymna scolopes are scattered on the dorsal epidermis. It has been proposed that neutral mucopolysaccharides, secreted by one gland type (goblet cells), are responsible for adhesion, whereas the release of the glue could be caused by acidic mucoproteins produced by ovate cells in the ventral epidermis. The ultrastructural re-investigation of the Euprymna epithelium in this study has indicated the presence of a new gland type (named flask cell), exclusively located in the dorsal epithelium and always neighboured to the known goblet cells. Based on our histochemical observations, the secretory material of the ovate cells does not display a strong reaction to tests for acidic groups, as had been previously assumed. Within the dermis, a large muscle network was found that was clearly distinctive from the normal mantle musculature. Based on our data, an antagonistic gland system, as previously proposed, seems to be unlikely for Euprymna scolopes. We hypothesize that the adhesive secretion is formed by two gland types (goblet and flask cells). The release of the sand coat may occur mechanically, i.e. by contraction of the dermal mantle muscle, and not chemically through the ovate cells.
[Mh] Termos MeSH primário: Secreções Corporais/química
Secreções Corporais/fisiologia
Cefalópodes/fisiologia
Fenômenos Fisiológicos da Pele
Pele/ultraestrutura
[Mh] Termos MeSH secundário: Adesividade
Animais
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170914
[Lr] Data última revisão:
170914
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160921
[St] Status:MEDLINE



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