Tytuł:

Effects of Vocal Behaviour on Abundance Estimates of Rainforest Galliforms

Inny tytuł:

Aktywność głosowa a szacowanie liczebności tropikalnych kuraków ; Short notes

Twórca:

Nijman, Vincent

Współtwórca:

Museum and Institute of Zoology, Polish Academy of Sciences

Wydawca:

Museum and Institute of Zoology, Polish Academy of Sciences ; Natura Optima Dux Foundation

Miejsce wydania:

Warsaw

Data wydania/powstania:

2007

Opis:

pg(s) 186–190

Typ obiektu:

Journal/Article

Temat i słowa kluczowe:

Great Argus Pheasant ; Argusianus argus ; census methods ; Galliformes ; Indonesia ; line transects ; point counts ; research methods

Abstrakt:

A comparative study was undertaken to assess the effects of the vocal activity of a target species on its density estimates made using line transect counts and point counts. In Kayan Mentarang National Park (Indonesian Borneo) the Great Argus Pheasant Argusianus argus displayed different levels of calling activity. The study was conducted at a period when the birds were highly vocal, and again, at the same site, when the birds were significantly less vocal. Transect counts during periods of low vocal activity resulted in 13–20% lower density estimates compared to periods of high vocal activity, but these differences were not significant. Estimates derived from five-minute point counts during periods of low vocal activity, however, were 52% lower than those from periods of high vocal activity. Comparison of the two methods shows that density estimates derived from the point count method were consistently lower than those from the line transects. The lack of a fixed calling season in Argus Pheasants makes year-round censuses possible, yet the distinct temporal differences in calling rates necessitates that caution be exercised when results obtained in different years or at different times of the year are compared. It is concluded that there is an increased need for understanding the behavioural plasticity of species if census methods are to be improved.

Czasopismo/Seria/cykl:

Acta Ornithologica

Tom:

42

Zeszyt:

2

Strona pocz.:

186

Strona końc.:

190

Typ zasobu:

Text

Szczegółowy typ zasobu:

Journal

Format:

text/xml

Identyfikator zasobu:

10.3161/068.042.0201

Źródło:

MiIZ PAN, call no. P.257 ; MiIZ PAN, call no. P.4568 ; click here to follow the link

Język:

eng

Język streszczenia:

pol ; eng

Prawa:

Rights Reserved - Free Access

Zasady wykorzystania:

Copyright-protected material. May be used within the limits of statutory user freedoms

Digitalizacja:

Museum and Institute of Zoology of the Polish Academy of Sciences

Lokalizacja oryginału:

Library of the Museum and Institute of Zoology of the Polish Academy of Sciences

Dostęp:

Open