Volume 6 - N. 3
3 1982

Avocetta
Volume 6 - N. 3



  1. Avocetta n. 6 (3) - 1982

    Abstract     Read Article       Download
    15 104
  2. MIGRATION OF THE TURTLE DOVE STREPTOPELIA TURTUR L. IN THE REGION OF VOJVODINA (YUGOSLAVIA)

    DIMITRIJEVIC S.

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    15 51

    Since 1965 a mass migration of Turtle Doves has been recorded in Voi
    vodina, probably as a consequence of the increase in sunflower cultI
    vations.
    On the basis of the hunting results fram 1971 to 1975, the places of
    main concentrations and the migration ways in Vojvodina are shown.
    These are regions of Northern and Central Backa and Northern and South
    -Eastern Banat. The migrations is more intensive in Backa. A number of
    over 100.000 migrating Turtle Doves per year is estimated, and the damage
    to sunflower crops is discussed.

  3. THE TIME COMPONENT IN WATERFOWL DIET ANALYSES

    Zuur B. J.

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    14 60

    Five species of waterfowl (Ma11ard Anas platyrhynchos, Tea1 A.crecca>
    Tufted Duck Ayrhya fuligula> Pochard A.ferina, and Coot Fulica atra)
    showed dai1y f1uctuations in the abso1ute and relative abundance of
    consumed food types. lf these f1uctuations are not taken into account
    in diet analyses, dietary differences usua11y attributed to demogra –
    phic, seasona1 or other variab1es may actua11y be due to the norma1
    dai1y feeding patterns. Some species fed large1y at.night (t he :.11a1-
    1ards and the Pochards) and the importance of nocturnally conaumed
    foods will be underestimated in norma l diet analyses. The Teal had ap’
    parently altered its feeding behaviour to feed outside the peak shoo~
    ting time. lt is recommended that the population investigated be sampled
    throughout the day, and that the feeding times be weighed in sub
    sequent analysis according to the amount of food consumed and not according
    to the number of birds shot.
    The integraI of the time/food curve is an ideaI way of describing a
    diet, alt houg h this may be difficult to apply in pract i ce , lt is po in:
    tless and misleading to present diets calculated. from incomplete and
    uneven data as “exac t ” percentages.

  4. NIDIFICAZIONE DELLA RONDINE HIRUNDO RUSTICA PRESSO NONANTOLA (MODENA)

    Selmi E.

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    20 37
  5. PERIODICI DI ORNITOLOGIA IN ITALIA DAL 1950 AL 1981

    Bogliani G. & Fasola M.

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    21 44
  6. OSSERVAZIONI SULLA LISTA ROSSA DEGLI UCCELLI ITALIANI

    Brichetti P. & Cambi D.

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    15 33