02264nas a2200121   4500008004100000245007800041210006900119260002900188520178000217100001801997700002402015856010302039       2012                        eng d00aCoralline algae from the Miocene Mahakam Delta (East Kalimantan, SE Asia)0 aCoralline algae from the Miocene Mahakam Delta East Kalimantan S  aCharlotte, USAc04/11/123 aAlthough the Miocene is the epoch of the onset of the biodiversity hotspot in South East Asia, crustose coralline algae (CCA) of this age are poorly known in region. To fill this knowledge gap, crucial to understand the evolutionary history of reef building coralline algae, we studied CCA in Miocene reefs in the Kutai Basin, the largest sedimentary basin in Borneo that was dominated by siliciclastic sediments of the Proto-Mahakam delta. Local carbonate buildups comprising low relief patch reefs occur within the deltaic succession in shallow and turbid water, influenced by high siliciclastic input (Wilson, 2002). CCA in the Kutai basin are mostly found in association with coral reefs, encrusting corals or fragments of them. In beds with very high siliciclastic content no coralline algae were observed in the outcrops, but corals were still present.

Two main CCA assemblages have been recognized in the studied Middle Miocene reefs: 1) a shallow-water assemblage, with two species of Neogoniolithon, thick crusts of Spongites, various Hydrolithon and also Sporolithon and Lithoporella. 2) In darker waters preferentilaly grew melobesioid assemblages, dominated by rhodoliths mainly consisting of Lithothamnion or by thin crusts of Mesophyllum and Sporolithon. This last one is the only assemblage found in mesophotic reefs.

CCA of East Kalimantan show occurrences of some extant species earlier than expected. These new first-occurrence dates are being used to produce a detailed time tree of the main reef building CCA species with the help of a new molecular phylogeny based on five genetic markers.

 

Wilson Moyra E.J. (2002) Cenozoic carbonates in Southeast Asia: implications for equatorial carbonate development. Sedimentary Geology 147, 295– 4281 aRösler, Anja1 aBraga, Juan, Carlos  uhttps://ipaeg.myspecies.info/content/coralline-algae-miocene-mahakam-delta-east-kalimantan-se-asia00771nas a2200181   4500008004100000245013200041210006900173260003600242100002500278700002100303700001700324700002800341700001800369700002400387700002500411700001900436856013400455       2012                        eng d00aPalaeoenvironmental reconstruction of a Miocene patch reef in East Kalimantan (Indonesia): a close-up on the bryozoan component0 aPalaeoenvironmental reconstruction of a Miocene patch reef in Ea  aBrno Czech Republicc31/05/20121 aDi Martino, Emanuela1 aTaylor, Paul, D.1 aNovak, Vibor1 aSantodomingo, Nadiezhda1 aRösler, Anja1 aBraga, Juan, Carlos1 aJohnson, Kenneth, G.1 aRenema, Willem  uhttps://ipaeg.myspecies.info/content/palaeoenvironmental-reconstruction-miocene-patch-reef-east-kalimantan-indonesia-close-bryozo00669nas a2200181   4500008004100000245007200041210006900113260003100182100002500213700002100238700001700259700002800276700001800304700002400322700002500346700001900371856009700390       2012                        eng d00aBryozoans from a Langhian patch reef in East Kalimantan (Indonesia)0 aBryozoans from a Langhian patch reef in East Kalimantan Indonesi  aCatania, Italyc24/05/20121 aDi Martino, Emanuela1 aTaylor, Paul, D.1 aNovak, Vibor1 aSantodomingo, Nadiezhda1 aRösler, Anja1 aBraga, Juan, Carlos1 aJohnson, Kenneth, G.1 aRenema, Willem  uhttps://ipaeg.myspecies.info/content/bryozoans-langhian-patch-reef-east-kalimantan-indonesia03072nas a2200205   4500008004100000245013700041210006900178260007500247520222000322653001502542653002002557653001702577653003802594653000902632653002402641100001802665700002402683700002502707856013402732       2011                        eng d00aThe origins and evolution of the modern Indo-Pacific reef algal flora: the coralline algae in the context of the THROUGHFLOW Project0 aorigins and evolution of the modern IndoPacific reef algal flora  aCluj Napoca, RomaniabInternational Fossil Algae Associationc12/09/113 aSouth East (SE) Asia hosts the global centre of maximum diversity for shallow marine ecosystems, mainly associated with thriving coral reefs (Renema et al., 2008). The factors responsible for the origins and maintenance of this diverse biota remain unknown. Previous studies suggest that the formation of the ancestral centre of diversity could be related to the constriction of the Indonesian Throughflow current (ITF) during the Cenozoic, resulting in increased speciation and/or immigration during the Miocene. Unfortunately, the fossil evidence currently available to document this pattern and its geographic context is sparse, and there is a need to collect new data.

The scientific objective of the THROUGHFLOW Project is to reconstruct the biological and environmental history of shallow marine habitats of a selected area of Southeast Asia. Specifically, a multidisciplinary study of key sections in Eastern Kalimantan (Indonesia) will be performed, integrating data from geology, geochemistry, ocean modeling, and paleontology to understand the Neogene history of the region.

In this framework, the projects carried out at Granada University aim to document the timing and patterns of the diversification of Indo-Pacific reef-building coralline algae, the second most important builders in modern Indo-Pacific reefs. The collected data will be integrated with a robust sedimentological framework for detailed reconstructions of the shallow marine carbonate paleoenvironments and their evolution through time.

The first expedition has been already carried out in East Kalimantan (Indonesia) during November-December 2010. A variety of shallow marine ecosystems, including coral reefs and sea grass environments, were found. First results show an exceptional preservation of some fossil algae, especially in places with a high siliciclastic influence (Miocene deposits of the Mahakam Delta). A new expedition is scheduled for summer 2011. We will study a wider temporal (Early to Late Miocene and possibly Late Oligocene) and spatial range of outcrops.

Acknowledgements: This paper is a contribution to the project supported by Marie Curie Actions, Seventh Framework Programme (Grant No. 237922).10acarbonates10acoralline algae10aINDO-PACIFIC10apaleoenvironmental reconstruction10aREEF10aTHROUGHFLOW project1 aRösler, Anja1 aBraga, Juan, Carlos1 aPerfectti, Francisco  uhttps://ipaeg.myspecies.info/content/origins-and-evolution-modern-indo-pacific-reef-algal-flora-coralline-algae-context-throughfl