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https://www.readbyqxmd.com/read/28300117/oceanography-climate-putting-stress-on-oceans
#1
(no author information available yet)
No abstract text is available yet for this article.
March 15, 2017: Nature
https://www.readbyqxmd.com/read/28282399/phylogeographic-patterning-among-two-codistributed-shrimp-species-crustacea-decapoda-palaemonidae-reveals-high-levels-of-connectivity-across-biogeographic-regions-along-the-south-african-coast
#2
Louisa E Wood, Sammy De Grave, Savel R Daniels
We compare the genetic structuring and demographic history of two sympatric caridean shrimp species with distinct life history traits, one amphidromous species Palaemon capensis and one marine/estuarine species Palaemon peringueyi, in the historical biogeographical context of South Africa. A total of 103 specimens of P. capensis collected from 12 localities and 217 specimens of P. peringueyi collected from 24 localities were sequenced for the mitochondrial cytochrome oxidase one (CO1) locus. Results from analyses of molecular variance (AMOVA), pairwise ΦST comparisons and haplotype networks demonstrate weak to moderate genetic differentiation in P...
2017: PloS One
https://www.readbyqxmd.com/read/28262764/the-origin-of-carbon-isotope-vital-effects-in-coccolith-calcite
#3
H L O McClelland, J Bruggeman, M Hermoso, R E M Rickaby
Calcite microfossils are widely used to study climate and oceanography in Earth's geological past. Coccoliths, readily preserved calcite plates produced by a group of single-celled surface-ocean dwelling algae called coccolithophores, have formed a significant fraction of marine sediments since the Late Triassic. However, unlike the shells of foraminifera, their zooplankton counterparts, coccoliths remain underused in palaeo-reconstructions. Precipitated in an intracellular chemical and isotopic microenvironment, coccolith calcite exhibits large and enigmatic departures from the isotopic composition of abiogenic calcite, known as vital effects...
March 6, 2017: Nature Communications
https://www.readbyqxmd.com/read/28239596/genetic-diversity-of-atlantic-bluefin-tuna-in-the-mediterranean-sea-insights-from-genome-wide-snps-and-microsatellites
#4
Aglaia Antoniou, Panagiotis Kasapidis, Georgios Kotoulas, Constantinos C Mylonas, Antonios Magoulas
BACKGROUND: Elucidating the patterns of the Atlantic Bluefin tuna [ABFT, Thunnus thynnus (Linnaeus, 1758)] population structure constitutes a challenging task of great importance. Most of the unique challenges stem from its biology, as well as the attributes of the marine realm in which it disperses. Accurate information is urgently needed for stock assessment, and the identification of critical features to the persistence and adaptation of populations in order to formulate and adopt effective strategies for ABFT conservation and management...
December 2017: Journal of Biological Research
https://www.readbyqxmd.com/read/28096366/iron-isotopes-reveal-distinct-dissolved-iron-sources-and-pathways-in-the-intermediate-versus-deep-southern-ocean
#5
Cyril Abadie, Francois Lacan, Amandine Radic, Catherine Pradoux, Franck Poitrasson
As an essential micronutrient, iron plays a key role in oceanic biogeochemistry. It is therefore linked to the global carbon cycle and climate. Here, we report a dissolved iron (DFe) isotope section in the South Atlantic and Southern Ocean. Throughout the section, a striking DFe isotope minimum (light iron) is observed at intermediate depths (200-1,300 m), contrasting with heavier isotopic composition in deep waters. This unambiguously demonstrates distinct DFe sources and processes dominating the iron cycle in the intermediate and deep layers, a feature impossible to see with only iron concentration data largely used thus far in chemical oceanography...
January 31, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28017608/biogeography-of-the-global-ocean-s-mesopelagic-zone
#6
Roland Proud, Martin J Cox, Andrew S Brierley
The global ocean's near surface can be partitioned into distinct provinces on the basis of regional primary productivity and oceanography [1]. This ecological geography provides a valuable framework for understanding spatial variability in ecosystem function but has relevance only partway into the epipelagic zone (the top 200 m). The mesopelagic (200-1,000 m) makes up approximately 20% of the global ocean volume, plays important roles in biogeochemical cycling [2], and holds potentially huge fish resources [3-5]...
January 9, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/27922602/elevated-temperature-increases-carbon-and-nitrogen-fluxes-between-phytoplankton-and-heterotrophic-bacteria-through-physical-attachment
#7
Nestor Arandia-Gorostidi, Peter K Weber, Laura Alonso-Sáez, Xosé Anxelu G Morán, Xavier Mayali
Quantifying the contribution of marine microorganisms to carbon and nitrogen cycles and their response to predicted ocean warming is one of the main challenges of microbial oceanography. Here we present a single-cell NanoSIMS isotope analysis to quantify C and N uptake by free-living and attached phytoplankton and heterotrophic bacteria, and their response to short-term experimental warming of 4 °C. Elevated temperature increased total C fixation by over 50%, a small but significant fraction of which was transferred to heterotrophs within 12 h...
March 2017: ISME Journal
https://www.readbyqxmd.com/read/27828967/quantification-and-analysis-of-icebergs-in-a-tidewater-glacier-fjord-using-an-object-based-approach
#8
Robert W McNabb, Jamie N Womble, Anupma Prakash, Rudiger Gens, Christian E Haselwimmer
Tidewater glaciers are glaciers that terminate in, and calve icebergs into, the ocean. In addition to the influence that tidewater glaciers have on physical and chemical oceanography, floating icebergs serve as habitat for marine animals such as harbor seals (Phoca vitulina richardii). The availability and spatial distribution of glacier ice in the fjords is likely a key environmental variable that influences the abundance and distribution of selected marine mammals; however, the amount of ice and the fine-scale characteristics of ice in fjords have not been systematically quantified...
2016: PloS One
https://www.readbyqxmd.com/read/27800161/navigating-uncertain-waters-a-critical-review-of-inferring-foraging-behaviour-from-location-and-dive-data-in-pinnipeds
#9
REVIEW
Matt Ian Daniel Carter, Kimberley A Bennett, Clare B Embling, Philip J Hosegood, Debbie J F Russell
In the last thirty years, the emergence and progression of biologging technology has led to great advances in marine predator ecology. Large databases of location and dive observations from biologging devices have been compiled for an increasing number of diving predator species (such as pinnipeds, sea turtles, seabirds and cetaceans), enabling complex questions about animal activity budgets and habitat use to be addressed. Central to answering these questions is our ability to correctly identify and quantify the frequency of essential behaviours, such as foraging...
2016: Movement Ecology
https://www.readbyqxmd.com/read/27782359/iceberg-killing-fields-limit-huge-potential-for-benthic-blue-carbon-in-antarctic-shallows
#10
David K A Barnes
Climate-forced ice losses are increasing potential for iceberg-seabed collisions, termed ice scour. At Ryder Bay, West Antarctic Peninsula (WAP) sea ice, oceanography, phytoplankton and encrusting zoobenthos have been monitored since 1998. In 2003, grids of seabed markers, covering 225 m(2) , were established, surveyed and replaced annually to measure ice scour frequency. Disturbance history has been recorded for each m(2) of seabed monitored at 5-25 m for ~13 years. Encrusting fauna, collected from impacted and nonimpacted metres each year, show coincident benthos responses in growth, mortality and mass of benthic immobilized carbon...
October 26, 2016: Global Change Biology
https://www.readbyqxmd.com/read/27780191/rapid-submarine-ice-melting-in-the-grounding-zones-of-ice-shelves-in-west-antarctica
#11
Ala Khazendar, Eric Rignot, Dustin M Schroeder, Helene Seroussi, Michael P Schodlok, Bernd Scheuchl, Jeremie Mouginot, Tyler C Sutterley, Isabella Velicogna
Enhanced submarine ice-shelf melting strongly controls ice loss in the Amundsen Sea embayment (ASE) of West Antarctica, but its magnitude is not well known in the critical grounding zones of the ASE's major glaciers. Here we directly quantify bottom ice losses along tens of kilometres with airborne radar sounding of the Dotson and Crosson ice shelves, which buttress the rapidly changing Smith, Pope and Kohler glaciers. Melting in the grounding zones is found to be much higher than steady-state levels, removing 300-490 m of solid ice between 2002 and 2009 beneath the retreating Smith Glacier...
October 25, 2016: Nature Communications
https://www.readbyqxmd.com/read/27734500/the-variable-routes-of-rafting-stranding-dynamics-of-floating-bull-kelp-durvillaea-antarctica-fucales-phaeophyceae-on-beaches-in-the-se-pacific
#12
Boris A López, Erasmo C Macaya, Fadia Tala, Florence Tellier, Martin Thiel
Dispersal on floating seaweeds depends on availability, viability, and trajectories of the rafts. In the southern hemisphere, the bull kelp Durvillaea antarctica is one of the most common floating seaweeds, but phylogeographic studies had shown low connectivity between populations from continental Chile, which could be due to limitations in local supply and dispersal of floating kelps. To test this hypothesis, the spatiotemporal dynamics of kelp strandings were examined in four biogeographic districts along the Chilean coast (28°-42°S)...
October 13, 2016: Journal of Phycology
https://www.readbyqxmd.com/read/27687507/oceanography-promotes-self-recruitment-in-a-planktonic-larval-disperser
#13
Peter R Teske, Jonathan Sandoval-Castillo, Erik van Sebille, Jonathan Waters, Luciano B Beheregaray
The application of high-resolution genetic data has revealed that oceanographic connectivity in marine species with planktonic larvae can be surprisingly limited, even in the absence of major barriers to dispersal. Australia's southern coast represents a particularly interesting system for studying planktonic larval dispersal, as the hydrodynamic regime of the wide continental shelf has potential to facilitate onshore retention of larvae. We used a seascape genetics approach (the joint analysis of genetic data and oceanographic connectivity simulations) to assess population genetic structure and self-recruitment in a broadcast-spawning marine gastropod that exists as a single meta-population throughout its temperate Australian range...
September 30, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27667909/tuna-and-swordfish-catch-in-the-u-s-northwest-atlantic-longline-fishery-in-relation-to-mesoscale-eddies
#14
Ango C Hsu, Andre M Boustany, Jason J Roberts, Jui-Han Chang, Patrick N Halpin
To analyze the effects of mesoscale eddies, sea surface temperature (SST), and gear configuration on the catch of Atlantic bluefin (Thunnus thynnus), yellowfin (Thunnus albacares), and bigeye tuna (Thunnus obesus) and swordfish (Xiphias gladius) in the U.S. northwest Atlantic longline fishery, we constructed multivariate statistical models relating these variables to the catch of the four species in 62 121 longline hauls made between 1993 and 2005. During the same 13-year period, 103 anticyclonic eddies and 269 cyclonic eddies were detected by our algorithm in the region 30-55°N, 30-80°W...
November 2015: Fisheries Oceanography
https://www.readbyqxmd.com/read/27572966/biogeography-and-environmental-genomics-of-the-roseobacter-affiliated-pelagic-chab-i-5-lineage
#15
Sara Billerbeck, Bernd Wemheuer, Sonja Voget, Anja Poehlein, Helge-Ansgar Giebel, Thorsten Brinkhoff, Lone Gram, Wade H Jeffrey, Rolf Daniel, Meinhard Simon
The identification and functional characterization of microbial communities remains a prevailing topic in microbial oceanography as information on environmentally relevant pelagic prokaryotes is still limited. The Roseobacter group, an abundant lineage of marine Alphaproteobacteria, can constitute large proportions of the bacterioplankton. Roseobacters also occur associated with eukaryotic organisms and possess streamlined as well as larger genomes from 2.2 to >5 Mpb. Here, we show that one pelagic cluster of this group, CHAB-I-5, occurs globally from tropical to polar regions and accounts for up to 22% of the active North Sea bacterioplankton in the summer...
2016: Nature Microbiology
https://www.readbyqxmd.com/read/27441285/latest-quaternary-palaeoceanographic-change-in-the-eastern-north-atlantic-based-upon-a-dinoflagellate-cyst-event-ecostratigraphy
#16
Rex Harland, Irina Polovodova Asteman, Audrey Morley, Angela Morris, Anthony Harris, John A Howe
The analyses of dinoflagellate cyst records, from the latest Quaternary sediments recovered from DSDP Core 610A taken on the Feni Ridge in the southern Rockall Trough, and part of core MD01-2461 on the continental margin of the Porcupine Seabight in the eastern North Atlantic Ocean, has provided evidence for significant oceanographic change encompassing the Last Glacial Maximum (LGM) and part of the Holocene. This together with other published records has led to a regional evaluation of oceanographic change in the eastern North Atlantic over the past 68 ka, based upon a distinctive dinoflagellate event ecostratigraphy...
May 2016: Heliyon
https://www.readbyqxmd.com/read/27432963/comparative-phylogeography-of-the-ocean-planet
#17
Brian W Bowen, Michelle R Gaither, Joseph D DiBattista, Matthew Iacchei, Kimberly R Andrews, W Stewart Grant, Robert J Toonen, John C Briggs
Understanding how geography, oceanography, and climate have ultimately shaped marine biodiversity requires aligning the distributions of genetic diversity across multiple taxa. Here, we examine phylogeographic partitions in the sea against a backdrop of biogeographic provinces defined by taxonomy, endemism, and species composition. The taxonomic identities used to define biogeographic provinces are routinely accompanied by diagnostic genetic differences between sister species, indicating interspecific concordance between biogeography and phylogeography...
July 19, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27326375/development-of-a-cost-effective-metabarcoding-strategy-for-analysis-of-the-marine-phytoplankton-community
#18
Tae-Ho Yoon, Hye-Eun Kang, Chang-Keun Kang, Sang Heon Lee, Do-Hwan Ahn, Hyun Park, Hyun-Woo Kim
We developed a cost-effective metabarcoding strategy to analyze phytoplankton community structure using the Illumina MiSeq system. The amplicons (404-411 bp) obtained by end-pairing of two reads were sufficiently long to distinguish algal species and provided barcode data equivalent to those generated with the Roche 454 system, but at less than 1/20th of the cost. The original universal primer sequences targeting the 23S rDNA region and the PCR strategy were both modified, and this resulted in higher numbers of eukaryotic algal sequences by excluding non-photosynthetic proteobacterial sequences supporting effectiveness of this strategy...
2016: PeerJ
https://www.readbyqxmd.com/read/27304855/pup-vibrissae-stable-isotopes-reveal-geographic-differences-in-adult-female-southern-sea-lion-habitat-use-during-gestation
#19
Alastair M M Baylis, Gabriele J Kowalski, Christian C Voigt, Rachael A Orben, Fritz Trillmich, Iain J Staniland, Joseph I Hoffman
Individuals within populations often differ substantially in habitat use, the ecological consequences of which can be far reaching. Stable isotope analysis provides a convenient and often cost effective means of indirectly assessing the habitat use of individuals that can yield valuable insights into the spatiotemporal distribution of foraging specialisations within a population. Here we use the stable isotope ratios of southern sea lion (Otaria flavescens) pup vibrissae at the Falkland Islands, in the South Atlantic, as a proxy for adult female habitat use during gestation...
2016: PloS One
https://www.readbyqxmd.com/read/27228344/principles-of-systems-biology-no-5
#20
(no author information available yet)
If systems biology is about understanding how links between components yield emergent phenomena, this month's Cell Systems Call (Cell Systems 1, 307) contains a veritable bounty of examples, showcasing the breadth of the field from systems oceanography to molecular evolution to the influence of cellular niche microenvironments on stem cell development.
May 25, 2016: Cell Systems
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