Journal article:
Spatial and seasonal reef calcification in corals and calcareous crusts in the central Red Sea

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June 2016
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Roik, Anna
Roder, Cornelia
Röthig, Till
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Abstract
The existence of coral reef ecosystems critically relies on the reef carbonate framework produced by scleractinian corals and calcareous crusts (i.e., crustose coralline algae). While the Red Sea harbors one of the longest connected reef systems in the world, detailed calcification data are only available from the northernmost part. To fill this knowledge gap, we measured in situ calcification rates of primary and secondary reef builders in the central Red Sea. We collected data on the major habitat-forming coral genera Porites, Acropora, and Pocillopora and also on calcareous crusts (CC) in a spatio-seasonal framework. The scope of the study comprised sheltered and exposed sites of three reefs along a cross-shelf gradient and over four seasons of the year. Calcification of all coral genera was consistent across the shelf and highest in spring. In addition, Pocillopora showed increased calcification at exposed reef sites. In contrast, CC calcification increased from nearshore, sheltered to offshore, exposed reef sites, but also varied over seasons. Comparing our data to other reef locations, calcification in the Red Sea was in the range of data collected from reefs in the Caribbean and Indo-Pacific; however, Acropora calcification estimates were at the lower end of worldwide rates. Our study shows that the increasing coral cover from nearshore to offshore environments aligned with CC calcification but not coral calcification, highlighting the potentially important role of CC in structuring reef cover and habitats. While coral calcification maxima have been typically observed during summer in many reef locations worldwide, calcification maxima during spring in the central Red Sea indicate that summer temperatures exceed the optima of reef calcifiers in this region. This study provides a foundation for comparative efforts and sets a baseline to quantify impact of future environmental change in the central Red Sea.
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Subject (DDC)
570 Biosciences, Biology
Keywords
Coral reef, Calcification, Red Sea, Buoyant weight, Seasonality, Cross-shelf gradient
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Coral Reefs ; 35 (2016), 2. - pp. 681-693. - Springer. - ISSN 0722-4028. - eISSN 1432-0975
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Cite This
ISO 690ROIK, Anna, Cornelia RODER, Till RÖTHIG, Christian R. VOOLSTRA, 2016. Spatial and seasonal reef calcification in corals and calcareous crusts in the central Red Sea. In: Coral Reefs. Springer. 35(2), pp. 681-693. ISSN 0722-4028. eISSN 1432-0975. Available under: doi: 10.1007/s00338-015-1383-y
BibTex
@article{Roik2016-06Spati-50739,
  year={2016},
  doi={10.1007/s00338-015-1383-y},
  title={Spatial and seasonal reef calcification in corals and calcareous crusts in the central Red Sea},
  number={2},
  volume={35},
  issn={0722-4028},
  journal={Coral Reefs},
  pages={681--693},
  author={Roik, Anna and Roder, Cornelia and Röthig, Till and Voolstra, Christian R.}
}
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