Influence of local environmental conditions and bleaching histories on the diversity and distribution of Symbiodinium in reef-building corals in Tanzania

Pollution, turbidity and coral bleaching history, as well as coral diversity, vary along the Tanzanian coastline. Prior to this study, it was not known whether exposure to such environmental variation might have influenced the diversity and distribution of Symbiodinium along this coastline. Such inf...

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Bibliographic Details
Published in:	African journal of marine science Vol. 38; no. 1; pp. 57 - 64
Main Authors:	Chauka, LJ, Steinert, G, Mtolera, MSP
Format:	Journal Article
Language:	English
Published:	Grahamstown Taylor & Francis 22-04-2016 Taylor & Francis Ltd
Subjects:	climate change coral bleaching Coral reefs ITS-2 Ribosomal DNA turbidity
Online Access:	Get full text
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Summary:	Pollution, turbidity and coral bleaching history, as well as coral diversity, vary along the Tanzanian coastline. Prior to this study, it was not known whether exposure to such environmental variation might have influenced the diversity and distribution of Symbiodinium along this coastline. Such information can provide insight into whether Tanzanian reef-building corals develop adaptation to current trends of climate change. Here, 10 reef-building coral samples were collected from different reefs along the Tanzanian coast with different micro-environments and bleaching histories. The ITS-2 region of ribosomal DNA was employed in the characterisation of Symbiodinium harboured by reef-building corals. DGGE fingerprints and DNA sequences showed that most coral species host a single Symbiodinium type, which is maintained throughout the coast regardless of local environmental differences. We present polymorphic symbioses in Acropora spp., Millepora sp. and Galaxea fascicularis in mainly turbid and warm environments as a sign of adaptation to harsh conditions. However, such adaptation may not provide marked resistance to bleaching because Acropora is a bleaching-susceptible genus.
ISSN:	1814-232X 1814-2338
DOI:	10.2989/1814232X.2015.1123771