Volume 6 - N. 2
December 1982

Avocetta
Volume 6 - N. 2



  1. Avocetta n. 6 (2) - 1982

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  2. SEASONAL AND DIURNAL VARIATION OF WEIGHT IN FOUR PASSERIFORMES IN AUTUMN AND WINTER

    IOALE' P. & Benvenuti S.

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    During four years of ringing activity, we collected data on seasonaI
    (autumn and winter) and diurnal variatiornin body weight in
    four species of passerine birds (Robin Erithacus rubecula – Wren
    Troglodytes troglodytes – Dunnock Prunella modularis – Blackcap
    Sylvia atricapilla). Among the populations of the first three
    species, resident from October to March, we recorded a continuous
    increase in body weight, even when the environrnental temperature
    was rising in Febraury and March. This pattern of weight variation
    i s different from that observed in t rans+Se haran migrating pas se+
    rines, and in cold climates wintering birds. We also recordea a
    weight increase during the day, due in part to the storage of lipids
    utilized during the nightime resto

  3. BIRD COMMUNITY OF THE MEDITERRANEAN FOREST OF MIGLIARINO (PISA -CENTRAL  ITALY)

    Farina A.

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    Dans le printemps et l’automne 1979, on a effectué des recensements
    d’oiseaux dans la foret de Migli~rino, un bois de plaine, caractérizé par
    des plantations à Pin~s pinea. Pendant la période de la nidifìcation on a
    recensé 31 espèces, et 30 dans la période de l’automne. Le bas turnover
    saisonnier montre un grand équilibre du milieux caracterizés par une succession
    écologique déplacée vers des étages avancés.
    On a trouvé faible densité de couples difficile à expliquerj plusieurs
    causes peuvent contribuer à cela. On n’a pas trouvé de grandes différences
    entre la diversité et l’equiripartition des deux périodes considérées;
    On a trouvé de petites valeurs de dominance pour l’espèce la plus abbondante
    et pour les deux espèces les plus abbondantes.
    La structure de la communauté d’oiseaux soit in printemps soit in automne
    est typique d’un écosysthème. dans un stade avancé de la succession.

  4. DISTRIBUZIONE ALTITUDINALE DI ALCUNI STRIGIDAE IN VAL DI TOVEL (TRENTINO)

    Pedrini P.

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    Play back stimulations of the vocal activity revealed some seasonal
    differencecin the altitudinal distribution and some habitat prefe~ences
    of the Tengmalm’s Owl AegoZius funereus, Pygmy Owl GZaucidium passerinum
    and Tawny Owl Strix aZucq.
    The low altitudinal boundaries of Tengmalm’s and Pygmy Owls are 900
    m in autumn (Fig. l) and 1200 m in spring and summer (Fig. 2). During the
    reproductive period these two species live mainly in mature woods of spr~
    ce and white fir, while in autumn they may be found also in Scottish Pine
    woods. The upper altitudinal boundary of the Tawny Owl is 1100 m, and
    it lives only in deciduous woodlands.

  5. NUOVE NIDIFICAZIONI DI PISPOLA ANTHUS PRATENSIS IN ABRUZZO

    DI FABRIZIO F., PELLEGRINI M., SANTONEA P.

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    NEW RECORDS OF NESTING MEADOW PIPIT ANTHUS PRATENSIS IN CENTRAL APPENNINI
    (Italy) .
    In Italy this species was previously recorded nesting only in the
    Abruzzo National Park.
    In all, we found 3 breding sites with at least 45 pairs on CentraI AE
    pennini mountains, from 1100 to 2200 m.a.s.l .•

  6. COMMENTI: ORNITOLOGIA IN ITALIA, PASSATO PRESENTE E FUTURO

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  7. PROSPETTIVE DELL' INANELLAMENTO A SCOPO SCIENTIFICO IN ITALIA

    Bendini L.

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  8. Nuovi Avvistamenti

    Toso S.

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