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  • 1
    Online Resource
    Online Resource
    Dordrecht :Springer Netherlands,
    Keywords: Oceanography. ; Climatology. ; Electronic books.
    Description / Table of Contents: Here is an interdisciplinary overview of the role the world's ocean's play as a 'carbon sink', and how this relates to climate change. It analyzes a range of topics from the impact of conurbations on the CO2 content of nearby seas to sequestration technology.
    Type of Medium: Online Resource
    Pages: 1 online resource (185 pages)
    Edition: 1st ed.
    ISBN: 9789048198214
    DDC: 551.466
    Language: English
    Note: Intro -- Oceans and the AtmosphericCarbon Content -- Preface -- Contents -- Chapter 1: Climate Variability in the North-Western Iberian Peninsula During the Last Deglaciation -- Chapter 2 Impact of Oporto Metropolitan Area Carbon Dioxide Emissions over the Adjacent Coastal Zone -- Chapter 3 Present Day Carbon Dioxide Fluxes in the Coastal Ocean and Possible Feedbacks Under Global Change -- Chapter 4 Aspects of Phytoplankton Communities Response to Climate Changes -- Chapter 5 pH Decrease and Effects on the Chemistry of Seawater -- Chapter 6 Effects of Sediment Acidification on the Bioaccumulation of Zn in R. Philippinarum -- Chapter 7: Contaminant Cycling Under Climate Change: Evidences and Scenarios -- Chapter 8: The Use of Weight of Evidence for Environmental Quality Assessment in Sediments Above Sub-Seabed Geological Formations for the Storage of Carbon Dioxide -- Index.
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  • 2
    Book
    Book
    Dordrecht [u.a.] : Springer
    Keywords: Ocean-atmosphere interaction ; Carbon dioxide sinks ; Atmospheric carbon dioxide ; Chemical oceanography ; Aufsatzsammlung ; Meereskunde ; Atmosphäre ; Kohlenstoffgehalt
    Type of Medium: Book
    Pages: X, 176 S. , Ill., graph. Darst., Kt. , 235 mm x 155 mm
    ISBN: 9789048198207
    RVK:
    RVK:
    Language: English
    Note: Literaturangaben , Climate variability in the north-western Iberian peninsula during the last deglaciation / Filipa Naughton ... [et al.]Impact of Oporto Metropolitan Area carbon dioxide emissions over the adjacent coastal zone / Rogério Carvalho, Nelson Barros, and Pedro Duarte -- Present day carbon dioxide fluxes in the coastal ocean and possible feedbacks under global change / Alberto V. Borges -- Aspects of phytoplankton communities response to climate changes / Maria de Graça Cabeçadas ... [et al.] -- pH decrease and effects on the chemistry of seawater / Juana Magdalena Santana-Casiano and Melchor González-Dávila -- Effects of sediment acidification on the bioaccumulation of Zn in R. philippinarum / Inmaculada Riba ... [et al.] -- Contaminant cycling under climate change : evidences and scenarios / Carlos Vale ... [et al.] -- The use of weight of evidence for environmental quality assessment in sediments above sub-seabed geological formations for the storage of carbon dioxide / Tomás-Ángel Del Valls Casillas ... [et al.].
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied phycology 3 (1991), S. 11-18 
    ISSN: 1573-5176
    Keywords: Gelidium ; Pterocladia ; harvesting ; yield ; biomass ; management
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This work brings together the scattered information on marine plant harvests and the colloid extraction industry in Portugal, as an initial contribution to the improvement of resource management. The first phase of exploitation of marine plant resources started prior to the 14th century, with the gathering and sale of storm-tossed seaweeds for fertilizer. The harvest of seagrasses and algae at Ria de Aveiro was of great economic importance. The second phase of resource exploitation began with the wider scale harvest of agarophyte species for colloid extraction. Portugal is at present the third largest harvester of the agarophytes Gelidium and Pterocladia (2500 t annually), and it is the fifth largest agar producer (350 t annually). Other colloid-producing species, including Chondrus crispus and Mastocarpus stellatus, are also harvested for export. The total agarophyte landings, agar production and income from agar exports is far below the maximum levels attained in the early 1970s. The status of stocks in each different harvest zone on the continental coast and the Azores is examined. Although there is an effective management structure for the Portuguese marine plant resource, research is needed to provide a sound biological basis for management.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-7373
    Keywords: brain metastasis ; carotid artery ; glioma ; infusion chemotherapy ; vertebral artery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We have used intra-arterial (i.a.) 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU) either alone or as part of adjuvant chemotherapy in patients with malignant brain tumors over a 3 year period (1979–1982). The i.a. BCNU technique was used 111 times to infuse 134 arteries in 37 patients. These patients, 28 cases with glial tumor and 9 cases with brain metastasis, received i.a. BCNU in combination with Vincristine and Procarbazine every 6 weeks. Complications encountered were transient and included: periorbital erythralgia or occipital-nuchal pain in 23 (62%), mild confusion and disorientation in 14 (38%), and ipsilateral conjunctival edema in 10 (27%). Reversible myelosuppression was not found. Our findings suggest that BCNU (100 Mg/M2) may be given by i.a. infusion in combination chemotherapy without persistent severe untoward effects with a cumulative dose of 700 mg/M2.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 326-327 (1996), S. 223-228 
    ISSN: 1573-5117
    Keywords: fecundity ; Gelidium sesquipedale ; Portugal ; reproduction ; seaweed ; size ; spore recruitment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Gelidium sesquipedale fecundity was quantified by counting tetrasporangial sori and cystocarps per meter squared and by estimating the number of spores contained inside them. These were obtained by regression on a size metric of reproductive structures. Tetrasporangial sori length and cystocarp thickness were the best estimators of spore number. To assess spore recruitment, 12 pottery tiles were fixed to the bottom, and the appearance of small fronds was monitored. No clear seasonal pattern of reproduction was found. Tetraspore production peaked in March 1990 with 10.4 × 106 spores m−2, whereas the carpospore peak was lower, 4.9 × 105 spores m−2 in July 1989. Recruitment followed tetraspore peaks. The probability of a G. sesquipedale tetraspore making the transition to a recruit was 4.7 × 10−5. Frond length was significantly related to tetrasporangial sori number, while cystocarp number was only related to frond branching order. Minimum size for reproduction was 6.9 cm for gametophytes and 5.4 cm for tetrasporophytes; very rarely were cystocarpic fronds smaller than 9 cm, while tetrasporic fronds were often longer than 15 cm. Cystocarpic fronds were significantly shorter and had more branches than tetrasporic fronds.
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2020-02-06
    Description: Oceanographic observations from the Eurasian Basin north of Svalbard collected between January and June 2015 from the N-ICE2015 drifting expedition are presented. The unique winter observations are a key contribution to existing climatologies of the Arctic Ocean, and show a ∼100 m deep winter mixed layer likely due to high sea ice growth rates in local leads. Current observations for the upper ∼200 m show mostly a barotropic flow, enhanced over the shallow Yermak Plateau. The two branches of inflowing Atlantic Water are partly captured, confirming that the outer Yermak Branch follows the perimeter of the plateau, and the inner Svalbard Branch the coast. Atlantic Water observed to be warmer and shallower than in the climatology, is found directly below the mixed layer down to 800 m depth, and is warmest along the slope, while its properties inside the basin are quite homogeneous. From late May onwards, the drift was continually close to the ice edge and a thinner surface mixed layer and shallower Atlantic Water coincided with significant sea ice melt being observed.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
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  • 7
    Publication Date: 2022-01-31
    Description: In the Arctic Ocean ice algae constitute a key ecosystem component and the ice algal spring bloom a critical event in the annual production cycle. The bulk of ice algal biomass is usually found in the bottom few cm of the sea ice and dominated by pennate diatoms attached to the ice matrix. Here we report a red tide of the phototrophic ciliate Mesodinium rubrum located at the ice-water interface of newly formed pack ice of the high Arctic in early spring. These planktonic ciliates are not able to attach to the ice. Based on observations and theory of fluid dynamics, we propose that convection caused by brine rejection in growing sea ice enabled M. rubrum to bloom at the ice-water interface despite the relative flow between water and ice. We argue that red tides of M. rubrum are more likely to occur under the thinning Arctic sea ice regime
    Type: Article , PeerReviewed
    Format: text
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  • 8
    Publication Date: 2018-03-15
    Description: IJGI, Vol. 7, Pages 109: Development of a QGIS Plugin to Obtain Parameters and Elements of Plantation Trees and Vineyards with Aerial Photographs ISPRS International Journal of Geo-Information doi: 10.3390/ijgi7030109 Authors: Lia Duarte Pedro Silva Ana Teodoro Unmanned Aerial Vehicle (UAV) imagery allows for a new way of obtaining geographic information. In this work, a Geographical Information System (GIS) open source application was developed in QGIS software that estimates several parameters and metrics on tree crown through image analysis techniques (image segmentation and image classification) and fractal analysis. The metrics that have been estimated were: area, perimeter, number of trees, distance between trees, and a missing tree check. This methodology was tested on three different plantations: olive, eucalyptus, and vineyard. The application developed is free, open source and takes advantage of QGIS integration with external software. Several tools available from Orfeo Toolbox and Geographic Resources Analysis Support System (GRASS) GIS were employed to generate a classified raster image which allows calculating the metrics referred before. The application was developed in the Python 2.7 language. Also, some functions, modules, and classes from the QGIS Application Programming Interface (API) and PyQt4 API were used. This new plugin is a valuable tool, which allowed for automatizing several parameters and metrics on tree crown using GIS analysis tools, while considering data acquired by UAV.
    Electronic ISSN: 2220-9964
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
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  • 9
    Publication Date: 2012-03-01
    Description: We examined whether the abundance and size of the starfish Marthasterias glacialis (Lamk.) exhibit a depthdependent partitioning on subtidal reefs. We tested the hypothesis that differences in food availability can result in habitat partitioning along a depth gradient. The abundance and size of M. glacialis was registered at 4 depth strata: 0-4 m, 4-8 m, 8-12 m, and 〉 12 m; we also recorded the number of food items that they were preying on. The abundance and size of M. glacialis decreased with depth. Mussels ( Mytilus galloprivincialis ) were the most preyed food item across all depth strata, followed by gastropods, sea urchins and barnacles; M. glacialis also consumed a significantly larger amount of mussels in feeding experiments compared with sea urchins and gastropods. The abundance of M. galloprivincialis beds decreased with depth. The clear link between the decrease in abundance and size of M. glacialis with depth and the decay of the most consumed prey (mussels) suggest that food availability may play an important role in the vertical distribution of this starfish, though wave-associated turbulence in the first few metres of the subtidal could also limit the abundance of M. glacialis .
    Print ISSN: 0214-8358
    Electronic ISSN: 1886-8134
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 10
    Publication Date: 2012-05-10
    Description: Anadenanthera peregrina is a Brazilian savanna tree species that occurs naturally in arsenic (As)-contaminated areas, and its As resistance has been associated with arbuscular mycorrhizal–fungi (AMF) symbiosis. A plant's ability to survive in stressful environments is correlated with its nutrition status, which can be affected by As uptake. The present study evaluated the influence of As on the concentrations and distribution of nutrients in the roots and shoots of A. peregrina grown in the absence of AMF. These plants were grown in substrates spiked with 0, 10, 50, and 100 mg As kg –1 for 25 d under greenhouse conditions, and the concentrations of essential macro- (P, K, Ca, Mg, N, and S) and micro- (Fe, Mn, Cu, Zn, B, and Mo) nutrients in the roots and shoots were then determined. Enhanced As levels increased the concentrations of P, S, and N and decreased Ca, Mg, and Fe. Although the deleterious effects of As on the plants were striking, the internal As levels were high, which indicated some tissue tolerance of A. peregrina.
    Print ISSN: 1436-8730
    Electronic ISSN: 1522-2624
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley-Blackwell
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