Produção Nacional
Revisado por pares
The implication of green algae (Chlorophyta) for palaeoecological reconstruction of the Holocene lagoon system in the Tramandai Lagoon region, Rio Grande do Sul, Brazil
2003; De Gruyter Open; Volume: 43; Issue: 1 Linguagem: Inglês
ISSN
2082-0259
AutoresSvetlana Medeanic, Vlasta Jankovská, Sérgio R. Dillenburg,
Tópico(s)Diatoms and Algae Research
ResumoA palynological study of 19 lagoon sediment core samples from the well T-14 (200 cm) drilled on the beach near the Tramandai Lagoon in the State of Rio Grande do Sul, Brazil was performed. A marine transgres- sion and a marine regression were distinguished in the Tramandai Lagoon region on the basis of algae (diatoms, acritarchs, silicoflagellates, green algae) and vascular-plant pollen and spores. A 14 C date of 5760 ± 120 yr BP at 140 cm depth corresponds to the marine transgression. A significant predominance of green algae was observed. Seven zones of the green algae genera Botryococcus and Pediastrum (coccal green algae), Debarya, Mougeotia, Spirogyra, and Zygnema (Zygnemophyceae) were identified, interpreted as climatic changes in this coastal re- gion. The conclusions based on algal data fit well with those based on pollen and spores of terrestrial and aquatic vascular plants.
Referência(s)