Photosynthesis and respiration of the cyanobacterium- containing sponge, Dysidea herbacea

1 Pages·1999·0.24 MB·

by  R Hinde

238 MEMOIRS OF THE QUEENSLAND MUSEUM
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TPSPHHOOENTGOCESY,YADNNYTOSHIBEDASEICASTHEAERRNIBDAUCMREE-ASC.POIMNReTmAoATiIIrOsNNoIfNOtGhFe p3sah0to-ut5ro0as(tyeinsmtohalettipachbootuot2nsp3.r0mo0d~uu2cm.stoeilco"n1phaiosntdornespa.hcomhte"od2ssyaentct"ha1ebsoNiuost
. .
QueenslandMuseum 44; 238. 1999:- Marine sponges seasonal differences in the photosynthetic and
containingcyanobacterialendosymbiontsarecommon respiration rates could be detected indicating that the
in tropical waters, and the dictyoceratid sponge, sponge adapts to changing environmental conditions.
Dysideaherbacea,isoneofthemostabundantsponges The D. herbacea/ O. spongeliae association, does
inthe shallow lagoon at One Tree Reef, Great Barrier howeverrespondtochangesintemperature,withaQ,
Reef This sponge contains large numbers of the for photosynthesis of about 5. Photosynthesis and
filamentous cyanobacterium, Oscillatoriaspongeliae. respiration rates are also sensitive to the
2
The O. spongeliae trichomes are located free in the concentration in the seawater. The implications of
sponge mesohyl, although they are often in contact these results for the ecology of this symbiotic
with archaeocytes. The high biomass of the association will be discussed. G Porifera,
cyanobacteriaisillustratedbythechlorophyllacontent Dictyoceratida, cyanobacterium, symbiosis,
ofthe association, which is about 335ug.mL"' sponge photosynthesis, respiration, temperature.
volume, or 180.3|ig.g"! sponge wet weight. These
values are much higherthan for any other sponges so Rosalind Hinde & F. Pironet, School ofBiological
farstudied. Sciences, University ofSydney, NSW, 2006, Australia;
Photosynthetic and dark respiration rates were M.A. Borowitzka (email;
measured using an oxygen electrode in summer and [email protected]), SchoolofBiological
winteratambientlagoontemperaturesandatsaturating Sciences & Biotechnology, Murdoch University, WA.
irradiances. The compensation point for 6150, Australia; 1June1998.