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  • The life history of Ostrocerca dimicki (Frison) in a short-flow, summer-dry Oregon stream [Elektronski vir]
    Stewart, Kenneth W. ; Anderson, Norman H.
    The voltinism and life history of Ostrocerca dimicki (Frison) were determined from monthly benthic collections of larvae, and adults from an emergence trap,from a short-flow, intermittent stream. ... Collections were from four water years, 1996-97, 1997-98, 1998-99, and 2002-03, selected from 17 years of samples. Determination of emergence timing was supplemented by collections of adults in 2008, from 10 emergence traps set to include a range of habitat types on the receiving seasonal stream. Growth was assessed by increase of head- capsule width of 667 larvae. A total of 202 males and 261 females were taken in the 4-year and 2008 emergence trap samples. Emergence in late February- April, first appearance of early- instar larvae the following December or January about a month after typical resumption of water flow, and rapid growth in 3-4 months, indicated a straightforward univoltine, fast cycle, with a probable over-summer egg diapause. Population levels fluctuated substantially over the 17-year period, depending on rainfall and duration of flow. Drought periods reduced the population, leading to low or no emergence and subsequent slow recovery, presumably from long-term diapausing eggs.
    Vir: Illiesia [Elektronski vir] : international journal of stonefly research. - ISSN 1854-0392 (Vol. 6, no. 6, 19. mar. 2010, str. 52-57)
    Vrsta gradiva - e-članek
    Leto - 2010
    Jezik - angleški
    COBISS.SI-ID - 864245

    Povezava(-e):

    http://www2.pms-lj.si/illiesia/papers/Illiesia06-06.pdf
    Digitalna knjižnica Slovenije - dLib.si

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