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  • 1
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    On the patterns of biomass transfer in the benthic fauna of an amazonian black-water river, as evidenced by 32P label experiment (1991)
    Springer
    Details
    Publication Date: 1991-06-01
    Print ISSN: 0018-8158
    Electronic ISSN: 1573-5117
    Topics: Biology
    Published by Springer
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  • 2
    Electronic Resource
    Electronic Resource
    Behavioural responses of Biomphalaria glabrata(Say) to chemical factors from aquatic macrophytes including decaying Lemna paucicostata(Hegelm ex Engelm) (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 13 (1983), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. 1. The behavioural responses of the freshwater pulmonate snail Biomphalaria glabrata to homogenates of various aquatic macrophytes were investigated with the aid of diffusion olfactometers.2. Of the eleven species studied, three lacked any attractants or arrestants, two contained weak arrestants, and three induced strong repellent effects. Only two, Apium nodiflorum and Lemna paucicostata, induced significant attractant and arrestant effects comparable to those obtained with lettuce (Lactuca sativa) controls.3. Decaying Lemna paucicostata homogenate proved to be a significantly stronger attractant and arrestant than fresh homogenate. Evidence is given that these effects are mainly due to low molecular weight compounds (〈1000 mol. wt) of which the major end products of microbial decomposition, short chain carboxylic acids (C2-C5), are likely to be the most important. However, as carboxylic acids account for only a fraction of the total response, other low and high molecular weight compounds are also implicated.4. The ecological relevance of these results is discussed with particular reference to the hypothesis that the relationship between the snails and macrophytes is essentially mutualistic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1983.tb00005.x
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  • 3
    Electronic Resource
    Electronic Resource
    Changes in the concentrations of short-chain carboxylic acids and gases during decomposition of the aquatic macrophytes, Lemna paucicostata and Ceratophyllum demersum (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 15 (1985), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. 〈list xml:id="l1" style="custom"〉1Samples of two species of aquatic macrophytes, Lemna paucicostata and Ceratophyllum demersum, with which snail hosts of schistosomes are commonly associated, were homogenized, together with their epiphytic flora, and allowed to decompose in closed systems for up to 42 days.2After 10 days of incubation it was found that populations of rod and coccoid shaped bacteria had greatly increased. Fermentation proceeded only to the acid forming stage and no methane was produced.3Despite the differences in the morphologies, habitats and epiphytic flora of the two species, it was found that the short chain carboxylic acids, acetate, propanoate, butanoate and hydrogen were the major end products of microbial decomposition in both cases. There was also some oxygen production from photosynthetically active zones within the homogenates. Most of the accumulation profiles for the acids conformed to logistic growth curves, whereas the hydrogen values fluctuated.4The reasons for the biochemical changes, the differences between the patterns of decomposition in Lemna and Ceraiophyllum. and the ecological relevance of the results to the plants, micro-organisms and the snails are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1985.tb00188.x
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  • 4
    Electronic Resource
    Electronic Resource
    Changes in chemical composition of a decomposing aquatic macrophyte,Lemna paucicostata (1983)
    Springer
    Journal of chemical ecology 9 (1983), S. 889-911 
    Details
    ISSN: 1573-1561
    Keywords: Lemna paucicostata ; decomposition ; short-chain carboxylic acids ; ammonia ; Biomphalaria glabrata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract To understand the changes in chemical composition which may occur as an individual aquatic macrophyte decays, a species of tropical duckweed (Lemna paucicostata) was decomposed (aerobically and anaerobically) by its associated microbial population. Under anaerobic conditions, decomposition of the plant and microbial growth were very rapid. Shortchain carboxylic acids (C2-C5) and ammonia were generated in considerable amounts (reaching a maximum of ca. 30% by weight of original dry weight ofLemna after 71 days). In contrast, free sugars decreased, and amino compounds initially increased slightly and then decreased to the original levels. There were no physical or chemical indications of decomposition occurring under aerobic conditions. The likely biochemical pathways involved in anaerobic decomposition are discussed, and the results are compared with other anaerobic systems such as the rumen, sludge digestion, and aquatic sediments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987813
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  • 5
    Electronic Resource
    Electronic Resource
    On the patterns of biomass transfer in the benthic fauna of an amazonian black-water river, as evidenced by 32P label experiment (1991)
    Springer
    Hydrobiologia 215 (1991), S. 153-162 
    Details
    ISSN: 1573-5117
    Keywords: Amazon Basin ; aquatic ecology ; leaf litter ; blackwaters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Leaf litter colonised by aquatic decomposition fungi was labelled with Na2H32PO4 and placed in a submerged litter bank in the Central Amazonian river Tarumã-Mirim. Of a total of 540 animals subsequently collected and analysed, 17% were definitely labelled. The phase-spatial pattern of label indicated that most species, notably fish and shrimps, were territorial with a radius of movement rarely exceeding 1 m; while chironomids and other microfauna are virtually stationary. From the distribution of labelled individuals within the litter bank and the gradual buildup of label it seems the fish feed within the same small area over periods of several weeks. The appearance of label in the shrimps was more erratic. The 32P appeared to be firmly retained within the living cells throughout the experiment and passed via the foodchains previously established by analysis of gut contents. The observed predator/prey density and foraging pattern have important implications for competition theory and the maintainance of species richness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00014718
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