TY - Generic T1 - On the origins of the coral diversity in Southeast Asia T2 - 12th International Coral Reef Symposium Y1 - 2012 A1 - Nadiezhda Santodomingo A1 - Kenneth G. Johnson A1 - Willem Renema AB -

Evidences from palaeontological and molecular studies suggest that the formation of the SE Asian ancestral centre of diversity occurred during the Miocene. Under the umbrella of the Throughflow project, delta-front patch reefs from 42 outcrops were studied in East Kalimantan (Indonesia), including extensive collections of tens of thousands of specimens within 265 samples. This research aims to answer how diverse were corals during the Miocene and which environmental factors played a role in their diversification on both, temporal and spatial scales. Coral morphologies seem to respond to the gradient of siliciclastic input created by the Mahakan Delta system. Platy-coral assemblages were common in the vicinity of the delta, characterized by a higher turbid-water regime, and mainly from the Early to Middle Miocene (up to Serravallian age). On the other hand, communities of branching corals mixed with scattered massive coral heads were more frequent during the Late Miocene (Tortonian to Messinian age) in settings located towards the north, far-off the delta influence. Although preliminary (<10% of samples examined), species diversity was high in both platy and branching coral assemblages, and comparable to modern coral settings living under similar environmental conditions. A total of 51 morphospecies (36 genera) have been identified so far, from which only three genera are considered as extinct, Dictyaraea, Anisocoenia, and Fungophyllia. Whether the observed species turnover is due to major global environmental changes after the Middle Miocene, or it is merely explained by switching of the Mahakan Delta gradient, or a combination of both, is an aspect to be examined in further integrated analysis including geochemistry and sedimentology.

JF - 12th International Coral Reef Symposium ER - TY - CONF T1 - Origins of coral diversity in Southeast Asia T2 - 5 International Symposium on Deep-Sea Corals Y1 - 2012 A1 - Nadiezhda Santodomingo A1 - Kenneth G. Johnson A1 - Willem Renema AB -

Southeast Asia hosts the maximum centre of coral diversity. Evidence from palaeontological and molecular studies suggests that the Miocene was an important period for diversification in the region. However, the fossil record is markedly undersampled. Of the \~{}200 species of azooxanthellate corals present in the region, only 49 species are known in the fossil record. As part of the Throughflow ITN project, we are collecting new data to document the Miocene diversity of zooxanthellate and azooxanthellate scleractinians from shallow and deep-water habitats preserved in outcrops of East Kalimantan (5-20 Million years old). This project has completed two five-week long field seasons and is currently processing samples. So far, we have identified the azooxanthellate taxa Caryophyllia, Stephanocyathus, Flabellum, Heterocyathus, and Madrepora. Preservation can be excellent allowing geochemical analysis to understand the paleoenviromental conditions in which these species were living. In combination with parallel studies on shallow water ecosystems, these new data provide insights to the origins of the high diversity in this region.

JF - 5 International Symposium on Deep-Sea Corals CY - Amsterdam ER - TY - JOUR T1 - A diverse patch reef from turbid habitats in the Middle Miocene (East Kalimantan, Indonesia) JF - Palaios Y1 - Submitted A1 - Nadiezhda Santodomingo A1 - Vibor Novak A1 - Vedrana Pretković A1 - Nathan Marshall A1 - Anja Rösler A1 - Emanuela Di Martino A1 - Elena LoGiudice A1 - Sonja Reich A1 - Juan Carlos Braga A1 - Willem Renema A1 - Kenneth G. Johnson ER - TY - CONF T1 - Towards a synthesis of Cenozoic pantropical paleontology T2 - 12 ICRS Y1 - 2012 A1 - Kenneth G. Johnson A1 - James Klaus A1 - Willem Renema A1 - Jonathan A. Todd JF - 12 ICRS CY - Cairns, Australia UR - http://www.icrs2012.com/Downloads/ICRS2012_Book_of_Abstracts.pdf ER - TY - CONF T1 - Origins of coral diversity in Southeast Asia T2 - 5th International Symposium on Deep-Sea Corals 2012 Y1 - 2012 A1 - Nadiezhda Santodomingo A1 - Kenneth G. Johnson A1 - Willem Renema A1 - the Throughflow Project JF - 5th International Symposium on Deep-Sea Corals 2012 CY - Amsterdam, The Netherlands ER - TY - CONF T1 - Southeast Asian and Caribbean Cenozoic Reef-coral diversity and the importance of large new collections T2 - 11th Symposium on Fossil Cnidaria and Sponges Y1 - 2011 A1 - Kenneth G. Johnson A1 - Brian R. Rosen A1 - Nadiezhda Santodomingo A1 - Willem Renema JF - 11th Symposium on Fossil Cnidaria and Sponges PB - M. aretz, S. Delculee, J. Denayer, And E. Poty (Eds.) ER -