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    <title>DRS Collection: Biological Sciences</title>
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    <title>The Channel Image</title>
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  <item rdf:about="http://drs.nio.org/drs/handle/2264/1124">
    <title>Arabian Sea oceanography and fisheries</title>
    <link>http://drs.nio.org/drs/handle/2264/1124</link>
    <description>Title: Arabian Sea oceanography and fisheries
&lt;br/&gt;
&lt;br/&gt;Authors: Madhupratap, M.; Nair, K.N.V.; Venugopal, P.; Gauns, M.; Haridas, P.; Gopalakrishnan, T.C.; Nair, K.K.C.
&lt;br/&gt;
&lt;br/&gt;Abstract: The physical and chemical forcing which drive the Arabian production is now fairly well understood. The main attributes, which contribute to the productivity are (1) the boundary processes which manifest as upwelling during summer monsoon and (2) winter cooling in the northern Arabian Sea. Phytoplankton blooms and high mesozooplankton biomass are common and examined how these might contribute to the fisheries along the west coast of India. From an oceanographic point this region can be divided into two areas: south of 15 degrees N and north of this latitude. Although the catches from these two areas are fairly equal, there is considerable differences in the composition. In the former, planktonivorous fishes dominate whereas in the north carnivores seem to be more abundant. Based on the lower food-web, it does not seem to be able to explain these differences.</description>
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  <item rdf:about="http://drs.nio.org/drs/handle/2264/1125">
    <title>Seaweed: A valuable marine plant source</title>
    <link>http://drs.nio.org/drs/handle/2264/1125</link>
    <description>Title: Seaweed: A valuable marine plant source
&lt;br/&gt;
&lt;br/&gt;Authors: Dhargalkar, V.K.; Pereira, N.
&lt;br/&gt;
&lt;br/&gt;Abstract: Seaweed, one of the components of seashore, is the most unique and important marine living resource. Its multi-ranged applications are of economic as well as ecological importance. These plants have been a source of food, feed and medicine in the orient, as well as in the west, since ancient times. However, in India seaweed usage is confined to industrial production of agar and alginate and is scarcely used for other purposes. Goa, a state along the west coast of India is blessed with 120 Km coastline. This article gives a brief review on the occurrence of seaweeds along the Goa coast with its species wise distribution. It also focuses on the need to harness the rixh potential of seaweeds and diversify the present limited use in otehr contemporary areas of application.</description>
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  <item rdf:about="http://drs.nio.org/drs/handle/2264/1126">
    <title>Subtidal micro and meiobenthic community structure in the Gulf of Kachchh</title>
    <link>http://drs.nio.org/drs/handle/2264/1126</link>
    <description>Title: Subtidal micro and meiobenthic community structure in the Gulf of Kachchh
&lt;br/&gt;
&lt;br/&gt;Authors: Ingole, B.S.; Goltekar, R.
&lt;br/&gt;
&lt;br/&gt;Abstract: Community structure of the micro- and meiobenthos of subtidal sediment from the Gulf of Kachchh were investigated during April 2002 (premonsoon season). Sediment samples were collected from 23 stations representing the entire Gulf area. A total of 25 microbenthic and 13 meiobenthic groups were recorded. Microbenthic density ranged from 53-19590 no. 3.3 cm sup(-2) (mean = 5448 plus or minus 5220; n = 23) in top 2 cm sediment layer and was mainly dominated by benthic diatoms (e.g Coscinodiscus and Navicila spp.). The total meiobenthic population in the top 5 cm sediment layer ranged between 27 to 1664 no. 10 cm sup(-2) (mean = 440 plus or minus 474; n = 23). The major groups in meiobenthos included Nematoda, Harpacticoida, Oligochaeta, Turbellaria and Polychaeta. The vertical distribution of meiobenthos indicated that more than 52% population occurred in upper 0-2 cm sediment layers. Nematode/copepod (N/C) ratio was high at the near shore stations located in the northeast sector and was mainly due to the increased abundance of deposit feeding nematodes. The high N/C ratio (greater than 60) at the shallow coastal stations reflects on the polluted/disturbed conditions having abnormally high organic loading in that area. This study suggests that, although the sedimentary and environmental setting in Gulf of Kachchh were not conducive for meiofaunal colonization, however, the higher standing stock of microbenthos indicates that conditions were appropriate for microbenthic proliferation. Hence, it is revealed that, in the absence of metazoan meiofauna, microbenthos (partly referred to as "Secret Garden" of shallow water unvegetated marine habitat) may act as an additional source to meet the required carbon demand at higher tropical level.</description>
  </item>
  <item rdf:about="http://drs.nio.org/drs/handle/2264/1119">
    <title>Nitrogen uptake by size-fractionated plankton in permanently well-mixed temperate coastal waters</title>
    <link>http://drs.nio.org/drs/handle/2264/1119</link>
    <description>Title: Nitrogen uptake by size-fractionated plankton in permanently well-mixed temperate coastal waters
&lt;br/&gt;
&lt;br/&gt;Authors: Wafar, M.V.M.; L'Helguen, S.; Raikar, V.; Maguernd, J.-F.; Le Corre, P.
&lt;br/&gt;
&lt;br/&gt;Abstract: Nitrogen uptake by net- (15-200 mu m), nano- (1-15 mu m) and picoplankton (less than 1 mu m) was measured over seasonal cycles at two stations with different patterns of biological and chemical cycles in the Morlaix Bay (western English Channel). Though assimilable dissolved N nutrient pool at both stations was nitrate-dominated, characteristics of biomass and N uptake by netplankton differed from conventional patterns in two respects. In the first, biomass (26-30%) and N uptake (36-43%) were less important than those of nanoplankton. In the second, the netplankton did not show any marked preference for nitrate over ammonium (nitrate to ammonium uptake ratios of 0.98 and 1.08). In contrast, nanoplankton had a preference for ammonium over nitrate (ammonium to nitrate uptake ratios of 2 and 1.2). N uptake by picoplankton was only 8% of total N uptake at both stations and was supported mainly by regenerated N (66% ammonium and 17% urea), with nitrate uptake detectable in only one instance and nitrite uptake in none. Substrate-dependent uptake of ammonium in all fractions and a higher ammonium uptake in the nanoplankton fraction in summer at both stations when ambient ammonium concentrations were high indicated that while nitrate may satisfy a part of N requirements, availability of ammonium and its flux through nanoplankton determine the magnitude of total N uptake in these waters. Most of the N uptake in picoplankton appears to be autotrophic, suggesting that a substantial part of heterotrophic uptake, if any, could be localized in the fractions greater than 1 mu m, and mediated by free-living and particle-bound bacteria.</description>
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