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Botanica Marina

Editor-in-Chief: Dring, Matthew J.

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Volume 60, Issue 2 (Apr 2017)

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Morphological changes with depth in the calcareous brown alga Padina pavonica

Katharina Bürger
  • Koordinationsstelle für Fledermausschutz und -forschung in Österreich (KFFÖ), Fritz-Störk-Strasse 13, A-4060 Leonding, Austria
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Elisabeth L. Clifford
  • Department of Limnology and Bio-Oceanography, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Michael Schagerl
  • Corresponding author
  • Department of Limnology and Bio-Oceanography, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria
  • Email
  • Other articles by this author:
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Published Online: 2017-03-15 | DOI: https://doi.org/10.1515/bot-2016-0069

Abstract

The calcareous brown alga Padina pavonica (L.) Thivy (Phaeophyceae, Dictyotales) is common worldwide in the sublittoral of warm-temperate coasts. We studied its distribution and changes of morphology and thallus anatomy along a light gradient. Specimens were collected at different depths in the Bay of Calvi (Corsica, Mediterranean) during spring and autumn. We sampled individuals for mapping and recorded a significant decrease of both coverage and number of individuals with depth, but an increase in frond size. Frond thickness and cell volumes (cell length, height, width) were measured and compared to irradiance levels and between two seasons. Fronds in spring were small and thick and contained larger cells than specimens collected in autumn. Additionally, fronds from shallow areas were thicker than those from deeper areas. Fronds always consisted of three cell layers, and both surfaces were calcified. A carbonate cover (carbonate content per unit dry mass and frond area) was present on both surfaces in both seasons, with a significantly lower cover in spring. In spring, the beginning of the growing season for Padina, the growth rates at sheltered and exposed sites and from different depths were all similar, averaging 0.45 mm day−1.

Keywords: anatomy; calcification; cell volume; growth rate; mapping; Padina pavonica

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About the article

Katharina Bürger

Katharina Bürger studied marine Biology at the University of Vienna and worked on this project for her Master’s thesis under the supervision of Dr. Michael Schagerl. She is a self-employed Biologist in bat conservation and currently the coordinator of the Association of Bat Conservation and Bat Research in Lower Austria.

Elisabeth L. Clifford

Elisabeth L. Clifford is currently a PhD student at the University of Vienna. Her research focuses on the bioavailability and importance of taurine, an amino-acid like compound, as a substrate for heterotrophic prokaryotes throughout the water column in contrasting marine environments (open water versus coasts). In general, her research interests encompass marine molecular and microbial ecology, biogeochemical fluxes as well as chemical communication signaling and interactions in marine food webs.

Michael Schagerl

Michael Schagerl is Professor at the University of Vienna; research fields are phycology and aquatic ecology. Special interests are ecophysiology, autecology and taxonomy of algae living in diverse habitats from springs to the sea and their role in food webs. In recent years, his research group has focused on saline-alkaline lakes and their biota.


Received: 2016-07-08

Accepted: 2017-02-03

Published Online: 2017-03-15

Published in Print: 2017-04-24


Citation Information: Botanica Marina, ISSN (Online) 1437-4323, ISSN (Print) 0006-8055, DOI: https://doi.org/10.1515/bot-2016-0069.

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