THE DISPERSAL ROUTE OF THE AUSTRALIAN ELEMENTS OF DACRYDIUM AND CASUARINA FROM ITS ORIGIN TO SE ASIA  

Oleh:

Lelono, Eko Budi

Jenis: Article from Journal - ilmiah nasional
Dalam koleksi: Lemigas Scientific Contributions to Petroleum Science & Technology vol. 32 no. 03 (Dec. 2009), page 157.
Topik: Dispersal route; Australian elements; Dacrydium and Casuarina; SE Asia

Ketersediaan

Perpustakaan PKPM Nomor Panggil: L15.1 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

This paper proposes the alternative migration route of the Australian elements of Dacrydium and Casuarina ji-om their origin to Southeast Asia. It was previously thought that these Australian affinities dispersed to Sunda region following the collision of the Australiar. and the Asian plates at the Oligo-Miocene boundary (Morley, 1998 and 2000). The subsequent study by Lelono (2007) extended the record of these two taxa from the Oligo­Miocene boundary to the base Oligocene. This is unlikely, since at the time of basal Oli­gocene, when these pollen types first appear, the Australian land mass would have been some 1000 kms south of the East Java area. Therefore, this fact led Lelono (2007) to propose the earlier arrival of the Gondwanan fragment to this area in Early Oligocene. However, recent records of Dacrydium have been reported from the Early Eocene of the Ninety East Ridge (55 Ma) and the Indian subcontinent (50 Ma) (Morley, 2009). This implies to the alternative dispersal route of this pollen. It is possible that Dacrydium dis­persed into SE Asia prior to the Early Oligocene via the Ninety East Ridge and the Indian plate, and subsequently its distribution across the Sunda region and Indochina was limited by palaeoclimate, explaining why it is present in some areas of the Sunda region, but not others. Mean while, a model to explain the dispersal of Casuarina remains unresolved, since migration via India is unlikely as there is no pollen record from the Indian subconti­nent. Therefore, long distance dispersal may be a possibility for this pollen.

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