First published online November 10, 2003
Heterotrophy on ultraplankton communities is an important source of nitrogen for a spongerhodophyte symbiosis
Adele J. Pile1,2,*,
Adrienne Grant2,
Rosalind Hinde2 and
Michael A. Borowitzka3
1 School of Biological Sciences, Flinders University, Adelaide, South
Australia 5001, Australia
2 School of Biological Sciences (A08), University of Sydney, New South Wales
2006, Australia
3 School of Biological Sciences and Biotechnology, Murdoch University,
Murdoch, Western Australia 6150, Australia

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Fig. 1. Relationship between HaliclonaCeratodictyon association wet
and dry mass.
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Fig. 2. Net growth rate of ultraplankton in the presence (Treatment, solid bars)
and absence (Control, open bars) of the HaliclonaCeratodictyon
association. Values are means ± S.D. *Significant
differences between treatments and controls and time of day (^), day
(open circles) vs night (closed circles) (P<0.05).
Significant seasonal differences (P<0.05) are present if
treatments (winter vs summer) do not share an underline.
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© The Company of Biologists Ltd 2003