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Botanica Marina

Editor-in-Chief: Dring, Matthew

Editorial Board Member: Enriquez Dominguez, Susana / Heimann, Kirsten / Pang, Ka-Lai / Pohnert, Georg / Poulin, Michel / Amsler, Charles D. / Beardall, John / Berges, John A. / Dawes, Clinton J. / Hoppenrath, Mona / Wynne, Michael J.

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Life history and morphological studies of Punctaria tenuissima (Chordariaceae, Phaeophyceae), a new record for the Azores

Manuela I. Parente1, 2 / Robert L. Fletcher3 / Ana I. Neto2, 4 / Ian Tittley5 / Ana F. Sousa6 / Stefano Draisma7 / Daniela Gabriel2

1Departamento de Ciências e Engenharia do Ambiente, Instituto do Mar – IMAR, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Quinta da Torre, 2829-516 Caparica, Portugal

2Departamento Biologia, Universidade dos Açores, Rua Mãe de Deus 58, Apartado 1422, P-9502, Ponta Delgada, São Miguel, Açores, Portugal

3University of Portsmouth, Institute of Marine Sciences, Ferry Road, Eastney, Portsmouth, Hampshire, PO4 9LY, UK

4CIIMAR (Centro Interdisciplinar de Investigação Marinha e Ambiental), Universidade do Porto, Rua dos Bragas, 289 – 4050-123 Porto, Portugal

5Department of Botany, The Natural History Museum, Cromwell Road, London SW7 5DB, UK

6Departamento de Oceanografia e Pescas, Universidade dos Açores, Cais de Santa Cruz, 9901-862-Horta, Faial, Açores, Portugal

7Institute of Ocean and Earth Sciences, University of Malaya, Kuala Lumpur 50603, Malaysia

Corresponding author

Citation Information: Botanica Marina. Volume 53, Issue 3, Pages 223–231, ISSN (Online) 1437-4323, ISSN (Print) 0006-8055, DOI: 10.1515/BOT.2010.030, June 2010

Publication History

Received:
2009-11-05
Accepted:
2010-03-09

Abstract

Punctaria tenuissima (Chordariaceae, Phaeophyceae) is reported for the first time from the Azores. Erect thalli were collected on the Island of São Miguel; they were up to 3 cm long, flattened and often twisted. The plurilocular sporangia were formed from surface cells that were quadrate or rectangular in surface view. Unilocular sporangia were not observed in the field. In culture, the plurispores of P. tenuissima developed into Hecatonema-like, tufted, prostrate thalli that formed plurilocular sporangia. The plurispores of the prostrate thalli cultured at 15°C with a long day (LD) photoperiod developed into new prostrate thalli, which in turn formed plurilocular sporangia. This cycle was repeated 5 times, resulting in several generations of reproductive prostrate thalli. When these cultures were cooled to 10°C with a short day (SD) photoperiod, new erect thalli developed from the prostrate thalli resembling the thalli collected in the field. These erect blades produced unilocular and plurilocular sporangia on the same or on different thalli. The plurispores and unispores produced by the erect thalli at 10°C under SD conditions once again developed into new prostrate thalli. This is the first report of unilocular sporangia formed in cultures of P. tenuissima. Sexual reproduction was not observed. The culture conditions, particularly temperature and daylength, appeared to influence the formation of erect blades. The Punctaria-like thalli were produced in 10°C/SD conditions, whilst the Hecatonema-like thalli were produced under 10°–15°C/LD and SD conditions. These results are similar to those reported for P. tenuissima from other locations and suggest the occurrence of both direct and heteromorphic life histories in the Azorean algae.

Keywords: Hecatonema terminale; life history; morphology; Phaeophyceae; Punctaria tenuissima

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