The influence of symbiont type on photosynthetic carbon flux in a model cnidarian-dinoflagellate symbiosis

Starzak, Dorota E., Quinnell, Rosanne G., Nitschke, Matthew R. and Davy, Simon K. (2014) The influence of symbiont type on photosynthetic carbon flux in a model cnidarian-dinoflagellate symbiosis. Marine Biology, 161 3: 711-724. doi:10.1007/s00227-013-2372-8

Author Starzak, Dorota E.
Quinnell, Rosanne G.
Nitschke, Matthew R.
Davy, Simon K.
Title The influence of symbiont type on photosynthetic carbon flux in a model cnidarian-dinoflagellate symbiosis
Journal name Marine Biology   Check publisher's open access policy
ISSN 0025-3162
Publication date 2014-03-01
Year available 2014
Sub-type Article (original research)
DOI 10.1007/s00227-013-2372-8
Open Access Status Not yet assessed
Volume 161
Issue 3
Start page 711
End page 724
Total pages 14
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Formatted abstract
We measured the relationship between symbiont diversity, nutritional potential, and symbiotic success in the cnidarian-dinoflagellate symbiosis, by infecting aposymbiotic (i.e. symbiont-free) specimens of the model sea anemone Aiptasia sp. with a range of Symbiodinium types. Four cultured heterologous Symbiodinium types (i.e. originally isolated from other host species) were used, plus both cultured and freshly isolated homologous zooxanthellae (i.e. from Aiptasia sp.). Rates of photosynthesis, respiration, and symbiont growth were measured during symbiosis establishment and used to estimate the contribution of the zooxanthellae to the animal's respiratory carbon demands (CZAR). Anemones containing Symbiodinium B1 (both homologous and heterologous) tended to attain higher CZAR values and hence benefit most from their symbiotic partners. This was despite Symbiodinium B1 not achieving the highest cell densities, though it did grow more quickly during the earliest stages of the infection process. Rather, the heterologous Symbiodinium types A1.4, E2, and F5.1 attained the highest densities, with populations of E2 and F5.1 also exhibiting the highest photosynthetic rates. This apparent success was countered, however, by very high rates of symbiosis respiration that ultimately resulted in lower CZAR values. This study highlights the impact of symbiont type on the functionality and autotrophic potential of the symbiosis. Most interestingly, it suggests that certain heterologous symbionts may behave opportunistically, proliferating rapidly but in a manner that is energetically costly to the host. Such negative host-symbiont interactions may contribute to the host-symbiont specificity seen in cnidarian-dinoflagellate symbioses and potentially limit the potential for partner switching as an adaptive mechanism.
Keyword Cnidarian–dinoflagellate symbiosis
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
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