Erratum to: Widespread prevalence of cryptic Symbiodinium D in the key Caribbean reef builder, Orbicella annularis
Erratum to: Widespread prevalence of cryptic Symbiodinium D in the key Caribbean reef builder, Orbicella annularis
复制标题
DOI：
10.1007/s00338-015-1282-2
复制
发表时间：
2015-06
期刊：
影响因子：
3.5
通讯作者：
E. Kennedy;N. Foster;P. Mumby;J. Stevens
中科院分区：
文献类型：
--
作者：
E. Kennedy;N. Foster;P. Mumby;J. Stevens
SymbiodiniumD, a relatively rare clade of algal endosymbiont with a global distribution, has attracted interest as some of its sub-cladal types induce increased thermal tolerance and associated trade-offs, including reduced growth rate in its coral hosts. Members ofSymbiodiniumD are increasingly reported to comprise low-abundance ‘cryptic’ (<10 %) proportions of mixed coral endosymbiont communities, with unknown ecological implications. Real-time PCR (RT-PCR) targeted to specific types is sufficiently sensitive to detect these background symbiont levels. In this study, RT-PCR was employed to screen 552 colonies of the key Caribbean reef builderOrbicellaannularissampled across a 5.4 million km2range for the presence of crypticSymbiodinium‘D1’ (i.e., the principal Caribbean ITS2 variants, D1 and D1–4). All but one out of 33 populations analysed were shown to host low abundances ofSymbiodiniumD1, with an average of >30 % of corals per site found to harbour the symbiont. When the same samples were analysed using the conventional screening technique, denaturing gradient gel electrophoresis,SymbiodiniumD1 was only detected in 12 populations and appeared to be hosted by <12 % of colonies where present (in agreement with other reported low prevalence/absences inO. annularis). CrypticSymbiodiniumD1 showed a mainly uniform distribution across the wider Caribbean region, although significantly more Mesoamerican Barrier Reef corals hosted crypticSymbiodiniumD1 than might be expected by chance, possibly as a consequence of intense warming in the region in 1998. Widespread prevalence of thermally tolerantSymbiodiniuminO. annularismay potentially reflect a capacity for the coral to temporarily respond to warming events through symbiont shuffling. However, association with reduced coral calcification means that the ubiquitous nature ofSymbiodiniumD1 inO.annularispopulations is unlikely to prevent long-term declines in reef health, at a time when maintaining reef growth is vital to sustain reef ecosystem function.
