Vertical stratification and its relation to foliage in tropical forest birds in Western Ghats [India]

• Autorzy: Jayson E A , Mathew D.N.
• Języki publikacji: EN

Abstrakty

EN

The study was carried out from May 1988 to April 1993 in two types of tropical forests: the tropical evergreen and moist deciduous. The vertical distribution of birds and foliage abundance was recorded by visual observation in seven height classes, using the line transect method. The vertical distribution of 94 bird species was recorded in evergreen forest, and of 90 in moist deciduous forest. Bird species richness and the numbers of birds were highest in the stratum from 1 to 5 m in both the evergreen forests (57 species) and the moist deciduous forests (68 species). The species richness indices of birds in the two types of forest did not display such a clear relationship. Foliage abundance was high up to a height of 30 m in the evergreen forests, whereas in moist deciduous forests, foliage was abundant only up to 20 m. A significant positive correlation was obtained between foliage abundance and species richness and also between the numbers of birds in both types of forests. Significant correlation was also obtained between foliage abundance and the species diversity indices in the two types of vegetation.

PL

Badania prowadzono w latach 1988-1993 w stanie Kerala (południowe Indie), w dwóch typach lasu tropikalnego: zawsze zielonym (EV) i wilgotnym liściastym (MD). Rozmieszczenie pionowe liczebności ptaków i obfitości listowia określano metodą transektową w 7 klasach wysokości (Tab. 1). Zebrano dane o 94 gatunkach w lesie EV i 90 gatunkach — w MD. W obu typach lasu bogactwo gatunkowe i liczebność ptaków były najwyższe w klasie wysokości 1-5 m (Fig. 1, Tab. 1), natomiast najniższe w warstwie najwyższej. Wskaźniki różnorodności wykazywały tę regularność w mniejszym stopniu (Tab. 1). W obu sezonach wegetacji (pora monsunowa i lato) obfitość ulistnienia zmniejszała się ze wzrostem wysokości (Fig. 2). Bogactwo gatunkowe i liczebność ptaków w obu lasach wykazały istotną pozytywną zależność od obfitości listowia, natomiast zależność ta nie uwidoczniła się we wskaźnikach różnorodności (Tab. 1). Wysoką różnorodność składu gatunkowego miała raczej średnia warstwa wysokości koron drzew.

Słowa kluczowe

EN

bird; Kerala; tropical forest; India; vertical stratification

• Wydawca: -
• Czasopismo: Acta Ornithologica
• Rocznik: 2003
• Tom: 38
• Numer: 2
• Opis fizyczny: p.111-116,fig.,ref.

Twórcy

autor

Jayson E A

• Kerala Forest Research Institute, Peechi 680653, Kerala, India

autor

Mathew D.N.

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