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Botanica Marina

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Volume 51, Issue 4 (Aug 2008)


Temperature response in a shallow-water Mediterranean population of Caulerpa racemosa var. cylindracea (Caulerpales, Chlorophyta), and a possible strategy of season anticipation

Maria Monia Flagella
  • 1Stazione Zoologica “Anton Dohrn”, Benthic Ecology Laboratory, Punta S. Pietro 1, 80077 Naples, Italy
/ Maurizio Lorenti
  • 2Stazione Zoologica “Anton Dohrn”, Benthic Ecology Laboratory, Punta S. Pietro 1, 80077 Naples, Italy
/ Maria Cristina Buia
  • 3Stazione Zoologica “Anton Dohrn”, Benthic Ecology Laboratory, Punta S. Pietro 1, 80077 Naples, Italy
Published Online: 2008-07-21 | DOI: https://doi.org/10.1515/BOT.2008.037


We studied growth and photosynthetic response of a shallow-water population of the invasive alga Caulerpa racemosa var. cylindracea off the Island of Ischia (Gulf of Naples, Italy). The effects of temperature on relative growth rate (RGR), light-saturated photosynthetic rate (Pmax), dark respiration rate (Rd) and optimal quantum yield (Fv/Fm) were assessed for thalli collected in two seasons (early winter and early summer). While temperatures higher than 22°C stressed early winter thalli, as reflected in the decrease in growth rates and optimal quantum yields, both increased with temperature in early summer plants. A difference between the two seasonal samples also occurred in the high-temperature sensitivity of respiration rates, which was enhanced in early winter plants. As changes in a number of the traits considered occur in advance of seasonal minima and maxima, C. racemosa var. cylindracea may behave as a season anticipator. The contribution of observed patterns to the colonization success of the alga is discussed.

Keywords: Caulerpa racemosa; growth rate; invasive algae; photosynthesis; temperature

About the article

Corresponding author

Received: 2007-10-19

Accepted: 2008-04-29

Published Online: 2008-07-21

Published in Print: 2008-08-01

Citation Information: Botanica Marina, ISSN (Online) 1437-4323, ISSN (Print) 0006-8055, DOI: https://doi.org/10.1515/BOT.2008.037. Export Citation

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