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  • 1
    Electronic Resource
    Electronic Resource
    Termites fumigate their nests with naphthalene (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 392 (1998), S. 558-559 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Termite nests provide a controlled environment and physical defence for the colonies of insects they house. Another important factor involved in colony defence may be volatile chemicals present in the nest: we have found the hydrocarbon naphthalene in extracts of the nest material produced by ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/33305
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Relationships between phytoplankton periodicity and the concentrations of total and unionized ammonia in channel catfish ponds (1984)
    Springer
    Hydrobiologia 111 (1984), S. 75-79 
    Details
    ISSN: 1573-5117
    Keywords: catfish culture ; ammonia ; phytoplankton ecology ; nitrogen cycle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phytoplankton abundance fluctuated throughout a 9 month study period in two 1.62 ha channel catfish (Ictalurus punctatus) production ponds. Summer phytoplankton communities in both ponds were dominated by blue-green algae (Cyanophyta). During periods of rapidly decreasing phytoplankton abundance, total ammonia-nitrogen concentrations increased but a decrease in pH during these same periods moderated the concentrations of unionized ammonia-nitrogen. Although unionized ammonia-nitrogen concentrations did not reach levels considered acutely toxic to fish, extended periods of moderately high unionized ammonia-nitrogen concentrations (〉O.15 mg/1) occurred in the late fall months and may have serious implications for fish health.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007383
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Phytoplankton communities in channel catfish ponds (1984)
    Springer
    Hydrobiologia 112 (1984), S. 137-141 
    Details
    ISSN: 1573-5117
    Keywords: phytoplankton ; algal ecology ; chlorophyll a ; catfish culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Seasonal changes in the quantity and quality of phytoplankton were studied in six channel catfish culture ponds. Chlorophyll a concentrations were generally highest in the summer (averaging 〉200 μg 1−1) but the highest individual chlorophyll a value recorded (910 μg 1−1) occurred in the winter during a bloom of Dictyosphaerium pulchellum. On the average, green algae (Chlorophyta) and euglenoids (Euglenophyta) represented relatively constant proportions of the phytoplankton community seasonally (about 35 and 10%, respectively). In the summer and fall, blue-green algae (Cyanophyta) became abundant. Diatoms were relatively abundant at all times and constituted the majority of the community in the winter and spring.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006918
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    Paper (German National Licenses)
    Fulltext
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