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  • 1
    Electronic Resource
    Electronic Resource
    Annual cyclicity in high-resolution stable carbon and oxygen isotope ratios in the wood of the mangrove tree Rhizophora mucronata (2004)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 27 (2004), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In the present study, the high-resolution stable carbon (13C/12C) and oxygen (18O/16O) isotope ratio profiles in the wood of the mangrove Rhizophora mucronata Lam., a tropical tree species lacking distinct growth rings, were investigated. Variations of both isotope ratios revealed a remarkable annual cyclicity with lowest values occurring at the latewood/earlywood boundary (April–May) and highest values during the transition from earlywood to latewood (October–November). Based on the current knowledge of the physiology of this mangrove species, as well as on the current literature available on high-resolution profiles of stable isotope ratios in tree rings, possible driving forces responsible for this seasonal pattern are discussed. The annual cyclicity, together with a conspicuous isotope pattern appearing in the El-Niño year 1997, promises great potential for tropical dendrochronology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.2004.01258.x
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  • 2
    Electronic Resource
    Electronic Resource
    Carbon, nitrogen contents and stable carbon isotope abundance in mangrove leaves from an east African coastal lagoon (Kenya)
    Amsterdam : Elsevier
    Aquatic Botany 47 (1994), S. 175-183 
    Details
    ISSN: 0304-3770
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0304-3770(94)90012-4
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  • 3
    Electronic Resource
    Electronic Resource
    Discrete suspended particles of barite and the barium cycle in the open ocean
    Amsterdam : Elsevier
    Earth and Planetary Science Letters 49 (1980), S. 528-550 
    Details
    ISSN: 0012-821X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0012-821X(80)90094-1
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of barium in sea water by cation- exchange separation and electrothermal atomic absorption spectrometry
    Amsterdam : Elsevier
    Analytica Chimica Acta 196 (1987), S. 33-40 
    Details
    ISSN: 0003-2670
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0003-2670(00)83067-6
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  • 5
    Electronic Resource
    Electronic Resource
    Direct determination of dissolved barium in sea water by inductively coupled plasma/atomic emission spectrometry
    Amsterdam : Elsevier
    Analytica Chimica Acta 222 (1989), S. 55-61 
    Details
    ISSN: 0003-2670
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0003-2670(00)81879-6
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  • 6
    Electronic Resource
    Electronic Resource
    Carbon and nitrogen isotopic composition of the fauna from the Broken Spur hydrothermal vent field (2000)
    Springer
    Marine biology 136 (2000), S. 11-17 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The carbon and nitrogen isotopic composition of 18 faunistic groups collected during the 39th cruise of the R.V. “Akademik Mstislav Keldysh” in September 1996 at the Broken Spur vent field, MAR, was studied. The trophic structure of the Broken Spur vent community is considered. All age stages of the shrimp Rimicaris exoculata living 5 m below the main aggregations at black smokers show higher δ15N and more depleted δ13C values than the same stages inhabiting the black smokers themselves. The shrimps R. exoculata and Chorocaris chacei demonstrate ontogenetic changes in δ13C (the former also in δ15N), with smaller individuals showing higher δ15N and more depleted δ13C values than larger shrimps. Benthopelagic and benthic components of the vent community differ significantly in δ13C and δ15N, the benthic fauna being less dependent upon chemosynthetic production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050002
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  • 7
    Electronic Resource
    Electronic Resource
    Elemental composition of suspended matter in the Scotia-Weddell Confluence area during spring and summer 1988 (EPOS leg 2) (1992)
    Springer
    Polar biology 12 (1992), S. 25-33 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary During austral spring and summer 1988 the upper 500 m of water column in the Scotia-Weddell Confluence was sampled for the elemental composition of total suspended matter. For particulate organic carbon surface water concentrations ranged between 2.5 and 15 μmol/l, with an estimated 19 to 47% of this pool being detrital carbon. In late November, the highest surface water particulate organic carbon concentrations (15 μmol/l) occurred in the Confluence area where they coincided with a maximum in particulate Si (1.7 μmol/l). Later in the season particulate Si in the Confluence area decreased to ≤0.3 μmol/l. In the Scotia Sea on the contrary, surface water particulate Si increased with time and reached 3 μmol/l in late December. For particulate Ca and Sr in surface water, strong gradients are observed across the Scotia Front (e.g. Ca: from 230 to 10 nmol/l; Sr: from 1.0 to 0.1 nmol/l), with highest concentrations in the Scotia Sea. In general, these distributions are confirmed by the observations on plankton species composition, done by other participants. In the Scotia Sea heavily calcified coccolithophorids and diatoms occurred throughout the season, while in the Confluence area heavily calcified coccolithophorids were absent and a switch-over from diatom to naked flagellate dominance was observed following a krill event. In the surface waters, the lithogenic Si fraction represents on average only 4% of the total particulate Si content. However, this fraction reaches 60% below 100 m depth in the Confluence area, due mainly to the presence of a sub-surface maximum in the aluminosilicate load (particulate Al content up to 30 pmol/l), probably reflecting advection of resuspended shelf sediments. Subsurface Ba/barite concentrations are highest in the Scotia Sea (280 pmol/l) and decrease through the Scotia Front to reach values of 100 pmol/l and less in the Confluence area, the marginal ice zone and the closed pack ice zone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00239962
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  • 8
    Electronic Resource
    Electronic Resource
    Role of Godavari mangroves (India) in the production and survival of prawn larvae (1997)
    Springer
    Hydrobiologia 358 (1997), S. 317-320 
    Details
    ISSN: 1573-5117
    Keywords: mangroves ; east coast of India ; Penaeus sp.. ; stablecarbon isotope ratios ; nurseries
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Godavari estuarine system extending over approximately316 km2 has significant annual variation of salinity dueto seasonal flooding which is mainly monsoon fed. This areahas dense vegetation of mangroves and is characterised bypredominance of Avicennia sp. Excoecaria agallochaand Rhizophora sp. In the coastal waters adjacent to themangroves three economically important species of prawns occur(Penaeus monodon, P. indicus and Metapenaeusmonoceros). Their larvae migrate and dwell in the mangroveenvironment. By analysis for the natural stable carbon isotoperatios, it was possible to establish the primary carbon sourcefrom the mangroves to that of larvae and juveniles of P. indicus and P. monodon. This information can be usedto exploit the mangrove habitat as prawnnurseries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003105508328
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  • 9
    Electronic Resource
    Electronic Resource
    Tracing mangrove carbon in suspended matter and aquatic fauna of the Gautami–Godavari Delta, Bay of Bengal (India) (2000)
    Springer
    Hydrobiologia 431 (2000), S. 225-241 
    Details
    ISSN: 1573-5117
    Keywords: Stable isotope tracers ; carbon ; nitrogen ; mangroves ; litterfall ; suspended matter ; zooplankton ; macrobenthos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Stable carbon isotopic composition and C/N ratio were used to trace the input of carbon associated with mangrove litter into the estuary of the Godavari–Gautami delta system and Kakinada bay (Andhra Pradesh, India). Suspended organic matter in the mangrove channels was more depleted in 13C (average δ13C = −24.5‰) than in Kakinada bay which showed δ13C values for suspended matter (average δ13C = −22.7‰) closer to those expected for marine phytoplankton. Suspended organic matter from mangrove channels was enriched in nitrogen (average C/N atom ratio ≤ 12.7) and 13C (average δ13C = −24.5‰) relative to mangrove leaf litter, which had a C/N ratio of 75 and a δ13C value of −28‰. Lowest C/N ratios for suspended matter were observed during southwest monsoon when rainfall was highest. Although in general, mangrove litter fall was also lower during this period, no clear correlation was observed between litter fall and C/N ratio of suspended matter. In general, the composition of suspended matter pointed towards phytoplankton as a major component. Isotopic composition of zooplankton suggested selective feeding on 13C-enriched, marine phytoplankton in open Kakinada bay and on 13C-depleted organic matter, such as estuarine phytoplankton and mangrove litter, in the mangrove channels. From the δ13C signature, it appeared that mangrove carbon was present to some extent in zooplankton and macrofauna from the mangrove mudflats and channels, but the signal rapidly decreased in Kakinada bay. Nitrogen isotopic composition of zooplankton and macrofauna indicated a progressive enrichment of 15N away from the mangrove forest towards the northern part of Kakinada bay, in approach of Kakinada city. This is thought to reflect input of anthropogenic nitrogen enriched in 15N and subsequent uptake of this enriched nitrogen into the aquatic food chain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004072310525
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  • 10
    Electronic Resource
    Electronic Resource
    The biological production of marine suspended barite and the barium cycle in the Western Mediterranean Sea (1987)
    Springer
    Biogeochemistry 4 (1987), S. 119-140 
    Details
    ISSN: 1573-515X
    Keywords: Ba ; barite ; biological production ; mass balance ; Mediterranean Sea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Suspended particulate barium was measured in the Western Mediterranean along 4 profiles sampled during the PHYCEMED 1 cruise in 1981. The non-terrigenous fraction of particulate barium (i.e. excess Ba; Baxs) can account for up to 96% of total barium. This fraction follows the barite settling and dissolution rate model we described earlier for the Atlantic Ocean, confirming barite as the carrier of excess barium. We propose that these Baxs concentrations, which are higher in the Western Mediterranean than in the overall Atlantic, may represent an adaptation of the microplankton to the high densities and density gradients of surface Mediterranean waters. A mass-balance for Ba in the Mediterranean Sea shows: (1) that the atmospheric source must be much more important than previously reported: (2) that contrary to the Atlantic situation, the internal recycling of barium is of little importance compared to the flow of barium through the system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02180151
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