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Marine Biology

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https://www.readbyqxmd.com/read/28229028/small-scale-spatial-variation-in-population-and-individual-level-reproductive-parameters-of-the-blue-legged-hermit-crab-clibanarius-tricolor
#1
J Antonio Baeza, Donald C Behringer
Management of the few regulated ornamental fisheries relies on inadequate information about the life history of the target species. Herein, we investigated the reproductive biology of the most heavily traded marine invertebrate in the western Atlantic; the blue-legged hermit crab Clibanarius tricolor. We report on density, individual-level, and population-level reproductive parameters in 14 populations spanning the Florida Keys. In C. tricolor, abundance, population-level, and individual-level reproductive parameters exhibited substantial small-scale spatial variation in the Florida Keys...
2017: PeerJ
https://www.readbyqxmd.com/read/28229018/-genomic-data-mining-of-the-marine-actinobacteria-streptomyces-sp-h-kf8-unveils-insights-into-multi-stress-related-genes-and-metabolic-pathways-involved-in-antimicrobial-synthesis
#2
Agustina Undabarrena, Juan A Ugalde, Michael Seeger, Beatriz Cámara
Streptomyces sp. H-KF8 is an actinobacterial strain isolated from marine sediments of a Chilean Patagonian fjord. Morphological characterization together with antibacterial activity was assessed in various culture media, revealing a carbon-source dependent activity mainly against Gram-positive bacteria (S. aureus and L. monocytogenes). Genome mining of this antibacterial-producing bacterium revealed the presence of 26 biosynthetic gene clusters (BGCs) for secondary metabolites, where among them, 81% have low similarities with known BGCs...
2017: PeerJ
https://www.readbyqxmd.com/read/28228916/species-diversity-and-abundance-of-marine-crabs-portunidae-decapoda-from-a-collapsible-crab-trap-fishery-at-kung-krabaen-bay-chanthaburi-province-thailand
#3
Chutapa Kunsook, Pongchai Dumrongrojwatthana
The diversity and abundance of marine crabs from a collapsible crab trap fishery at Kung Krabaen Bay, Gulf of Thailand, were observed from August 2012 to June 2013 using 10 sampling stations. The results showed that there were seven families, 11 genera and 17 species (two anomuran and 15 brachyuran crabs). The two anomuran species were Clibanarius virescens (1,710 individuals) and Clibanarius infraspinatus (558 individuals). For brachyuran crabs, Portunidae was the most common family, including 10 species. The dominant species of brachyuran crabs included Thalamita crenata (897 individuals), Portunus pelagicus (806 individuals), Charybdis affinis (344 individuals), Scylla sp...
January 2017: Tropical Life Sciences Research
https://www.readbyqxmd.com/read/28225766/marine-actinobacteria-as-a-source-of-compounds-for-phytopathogen-control-an-integrative-metabolic-profiling-bioactivity-and-taxonomical-approach
#4
Luz A Betancur, Sandra J Naranjo-Gaybor, Diana M Vinchira-Villarraga, Nubia C Moreno-Sarmiento, Luis A Maldonado, Zulma R Suarez-Moreno, Alejandro Acosta-González, Gillermo F Padilla-Gonzalez, Mónica Puyana, Leonardo Castellanos, Freddy A Ramos
Marine bacteria are considered as promising sources for the discovery of novel biologically active compounds. In this study, samples of sediment, invertebrate and algae were collected from the Providencia and Santa Catalina coral reef (Colombian Caribbean Sea) with the aim of isolating Actinobateria-like strain able to produce antimicrobial and quorum quenching compounds against pathogens. Several approaches were used to select actinobacterial isolates, obtaining 203 strains from all samples. According to their 16S rRNA gene sequencing, a total of 24 strains was classified within Actinobacteria represented by three genera: Streptomyces, Micromonospora, and Gordonia...
2017: PloS One
https://www.readbyqxmd.com/read/28221832/what-explains-patterns-of-diversification-and-richness-among-animal-phyla
#5
Tereza Jezkova, John J Wiens
Animal phyla vary dramatically in species richness (from one species to >1.2 million), but the causes of this variation remain largely unknown. Animals have also evolved striking variation in morphology and ecology, including sessile marine taxa lacking heads, eyes, limbs, and complex organs (e.g., sponges), parasitic worms (e.g., nematodes, platyhelminths), and taxa with eyes, skeletons, limbs, and complex organs that dominate terrestrial ecosystems (arthropods, chordates). Relating this remarkable variation in traits to the diversification and richness of animal phyla is a fundamental yet unresolved problem in biology...
March 2017: American Naturalist
https://www.readbyqxmd.com/read/28218290/the-interaction-between-the-proliferating-macroalga-asparagopsis-taxiformis-and-the-coral-astroides-calycularis-induces-changes-in-microbiome-and-metabolomic-fingerprints
#6
Stéphane Greff, Tânia Aires, Ester A Serrão, Aschwin H Engelen, Olivier P Thomas, Thierry Pérez
Mediterranean Sea ecosystems are considered as hotspots of biological introductions, exposed to possible negative effects of non-indigenous species. In such temperate marine ecosystems, macroalgae may be dominant, with a great percentage of their diversity represented by introduced species. Their interaction with temperate indigenous benthic organisms have been poorly investigated. To provide new insights, we performed an experimental study on the interaction between the introduced proliferative red alga Asparagopsis taxiformis and the indigenous Mediterranean coral Astroides calycularis...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28217746/integrated-regulatory-and-metabolic-networks-of-the-marine-diatom-phaeodactylum-tricornutum-predict-the-response-to-rising-co2-levels
#7
Jennifer Levering, Christopher L Dupont, Andrew E Allen, Bernhard O Palsson, Karsten Zengler
Diatoms are eukaryotic microalgae that are responsible for up to 40% of the ocean's primary productivity. How diatoms respond to environmental perturbations such as elevated carbon concentrations in the atmosphere is currently poorly understood. We developed a transcriptional regulatory network based on various transcriptome sequencing expression libraries for different environmental responses to gain insight into the marine diatom's metabolic and regulatory interactions and provide a comprehensive framework of responses to increasing atmospheric carbon levels...
January 2017: MSystems
https://www.readbyqxmd.com/read/28215555/intertidal-pool-fish-girella-laevifrons-kyphosidae-shown-strong-physiological-homeostasis-but-shy-personality-the-cost-of-living-in-hypercapnic-habitats
#8
S Benítez, C Duarte, T Opitz, N A Lagos, J M Pulgar, C A Vargas, M A Lardies
Tide pools habitats are naturally exposed to a high degree of environmental variability. The consequences of living in these extreme habitats are not well established. In particular, little it is known about of the effects of hypercanic seawater (i.e. high pCO2 levels) on marine vertebrates such as intertidal pool fish. The aim of this study was to evaluate the effects of increased pCO2 on the physiology and behavior in juveniles of the intertidal pool fish Girella laevifrons. Two nominal pCO2 concentrations (400 and 1600μatm) were used...
February 16, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28215323/marine-enzymes-production-and-applications-for-human-health
#9
T Eswara Rao, M Imchen, R Kumavath
Marine microbial enzymes have wide applications in bioindustries. Selection of microorganisms for enzyme production at the industrial level requires good yield and high production rate. A number of enzymes such as amylase, caseinase, lipase, gelatinase, and DNases have been discovered from microbes isolated from extreme marine environments. Such enzymes are thermostable, tolerant to a varied range of pH and other harsh conditions required in industrial applications. Novelty in their structure and characteristics has shown promising scope to the researchers in academia and industry...
2017: Advances in Food and Nutrition Research
https://www.readbyqxmd.com/read/28215321/biomedical-applications-of-enzymes-from-marine-actinobacteria
#10
K Kamala, P Sivaperumal
Marine microbial enzyme technologies have progressed significantly in the last few decades for different applications. Among the various microorganisms, marine actinobacterial enzymes have significant active properties, which could allow them to be biocatalysts with tremendous bioactive metabolites. Moreover, marine actinobacteria have been considered as biofactories, since their enzymes fulfill biomedical and industrial needs. In this chapter, the marine actinobacteria and their enzymes' uses in biological activities and biomedical applications are described...
2017: Advances in Food and Nutrition Research
https://www.readbyqxmd.com/read/28213548/effects-of-gelling-agent-and-extracellular-signaling-molecules-on-the-culturability-of-marine-bacteria
#11
Anita Mac Rygaard, Mariane Schmidt Thøgersen, Kristian Fog Nielsen, Lone Gram, Mikkel Bentzon-Tilia
Only 1 % of marine bacteria are currently culturable using standard laboratory procedures and this is a major obstacle for our understanding of the biology of marine microorganisms and for the discovery of novel microbial natural products. Therefore, the purpose of the present study was to investigate if improved cultivation conditions, including the use of an alternative gelling agent, and supplementation with signaling molecules, could improve the culturability of bacteria from seawater. Substituting agar with gellan gum improved viable counts 3 - 40-fold, depending on medium composition and incubation conditions, with a maximum of 6...
February 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28213541/accurate-quantification-of-laminarin-in-marine-organic-matter-with-enzymes-from-marine-microbes
#12
Stefan Becker, André Scheffel, Martin F Polz, Jan-Hendrik Hehemann
Marine algae produce varieties of glycans, which fulfill diverse biological functions and fuel the carbon and energy demand of heterotrophic microbes. A common approach to analyze marine organic matter uses acid to hydrolyze its glycans into measurable monosaccharides. These, however, may derive from different glycans that are built with the same monosaccharides, hence this approach does not distinguish between glycans in natural samples. Here we use enzymes to selectively digest and thereby quantify laminarin in particulate organic matter...
February 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28213175/quantitative-analysis-of-mycosporine-like-amino-acids-in-marine-algae-by-capillary-electrophoresis-with-diode-array-detection
#13
Anja Hartmann, Adele Murauer, Markus Ganzera
Marine species have evolved a variety of physical or chemical strategies to diminish damage from elevated environmental ultraviolet radiation. Mycosporine-like amino acids, a group of widely distributed small water soluble compounds, are biologically relevant because of their photo-protective potential. In addition, presumed antioxidant and skin protective strategies raise the interest for possible medicinal and cosmetic applications. In this study the first CE method for the quantification of mycosporine-like amino acids in marine species is presented...
February 4, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28212460/do-low-oxygen-environments-facilitate-marine-invasions-relative-tolerance-of-native-and-invasive-species-to-low-oxygen-conditions
#14
Marcelo E Lagos, Diego R Barneche, Craig R White, Dustin J Marshall
Biological invasions are one of the biggest threats to global biodiversity. Marine artificial structures are proliferating worldwide and provide a haven for marine invasive species. Such structures disrupt local hydrodynamics, which can lead to the formation of oxygen-depleted microsites. The extent to which native fauna can cope with such low oxygen conditions, and whether invasive species, long associated with artificial structures in flow-restricted habitats, have adapted to these conditions remains unclear...
February 17, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28211249/improving-the-interpretability-of-climate-landscape-metrics-an-ecological-risk-analysis-of-japan-s-marine-protected-areas
#15
Jorge García Molinos, Shintaro Takao, Naoki H Kumagai, Elvira S Poloczanska, Michael T Burrows, Masahiko Fujii, Hiroya Yamano
Conservation efforts strive to protect significant swaths of terrestrial, freshwater and marine ecosystems from a range of threats. As climate change becomes an increasing concern, these efforts must take into account how resilient protected spaces will be in the face of future drivers of change such as warming temperatures. Climate landscape metrics, which signal the spatial magnitude and direction of climate change, support a convenient initial assessment of potential threats to and opportunities within ecosystems to inform conservation and policy efforts where biological data are not available...
February 17, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28207172/drivers-of-redistribution-of-fishing-and-non-fishing-effort-after-the-implementation-of-a-marine-protected-area-network
#16
Reniel B Cabral, Steven D Gaines, Brett A Johnson, Tom W Bell, Crow White
Marine spatial planning (MSP) is increasingly utilized to sustainably manage ocean uses. Marine protected areas (MPAs), a form of spatial management in which parts of the ocean are regulated to fishing, are now a common tool in MSP for conserving marine biodiversity and managing fisheries. However, the use of MPAs in MSP often neglects, or simplifies, the redistribution of fishing and non-fishing activities inside and outside of MPAs following their implementation. This redistribution of effort can have important implications for effective MSP...
October 3, 2016: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28206708/physiological-metabolic-and-biotechnological-features-of-extremely-thermophilic-microorganisms
#17
REVIEW
James A Counts, Benjamin M Zeldes, Laura L Lee, Christopher T Straub, Michael W W Adams, Robert M Kelly
The current upper thermal limit for life as we know it is approximately 120°C. Microorganisms that grow optimally at temperatures of 75°C and above are usually referred to as 'extreme thermophiles' and include both bacteria and archaea. For over a century, there has been great scientific curiosity in the basic tenets that support life in thermal biotopes on earth and potentially on other solar bodies. Extreme thermophiles can be aerobes, anaerobes, autotrophs, heterotrophs, or chemolithotrophs, and are found in diverse environments including shallow marine fissures, deep sea hydrothermal vents, terrestrial hot springs-basically, anywhere there is hot water...
February 16, 2017: Wiley Interdisciplinary Reviews. Systems Biology and Medicine
https://www.readbyqxmd.com/read/28205577/epigenetic-signatures-of-invasive-status-in-populations-of-marine-invertebrates
#18
Alba Ardura, Anastasija Zaiko, Paloma Morán, Serge Planes, Eva Garcia-Vazquez
Epigenetics, as a DNA signature that affects gene expression and enables rapid reaction of an organism to environmental changes, is likely involved in the process of biological invasions. DNA methylation is an epigenetic mechanism common to plants and animals for regulating gene expression. In this study we show, for the first time in any marine species, significant reduction of global methylation levels during the expansive phase of a pygmy mussel (Xenostrobus securis) recent invasion in Europe (two-year old), while in older introductions such epigenetic signature of invasion was progressively reduced...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28205313/genetic-analyses-unravel-the-crucial-role-of-a-horizontally-acquired-alginate-lyase-for-brown-algal-biomass-degradation-by-zobellia-galactanivorans
#19
Yongtao Zhu, François Thomas, Robert Larocque, Nan Li, Delphine Duffieux, Lionel Cladière, Florent Souchaud, Gurvan Michel, Mark J McBride
Comprehension of the degradation of macroalgal polysaccharides suffers from the lack of genetic tools for model marine bacteria, despite their importance for coastal ecosystem functions. We developed such tools for Zobellia galactanivorans, an algae-associated flavobacterium that digests many polysaccharides, including alginate. These tools were used to investigate the biological role of AlyA1, the only Z. galactanivorans alginate lyase known to be secreted in soluble form and to have a recognizable carbohydrate-binding domain...
February 15, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28205261/stent-placement-prior-to-initiation-of-chemotherapy-in-patients-with-obstructive-nonoperative-left-sided-tumors-is-associated-with-fewer-stomas
#20
Javier Suárez, Gabriel Marín, Ruth Vera, Dorin Colibaseanu, Juan J Vila, Miguel A Ciga, Begoña Oronoz
BACKGROUND AND OBJETIVES: Due to the potential risks associated with stent placement, European Society Gastrointestinal Endoscopy does not recommend prophylactic insertion of stents in patients without symptoms. The aim was to compare complication rates, need of surgery, colostomy formation, and survival between stent placement prior to start of chemotherapy (SEMS group) and upfront ChT (ChT group) in patients with endoscopically non-transverable metastatic left-sided colorectal cancer...
February 15, 2017: Journal of Surgical Oncology
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