02197nas a2200109 4500008004100000245011900041210006900160260003200229520176600261100001702027856004302044 2012 eng d00aGastropod associations as a proxy for seagrass vegetation in a tropical carbonate setting (San Salvador, Bahamas) 0 aGastropod associations as a proxy for seagrass vegetation in a t aCharlotte, North Carolina. 3 a
Seagrass ecosystems play an important role in sedimentation processes and nutrient cycling and support local biodiversity by providing food and shelter for numerous associated organisms. These ecosystems have been around since the Late Cretaceous. In order to understand their emergence in geological time and their response to past perturbations we have to be able to recognize seagrass communities in the fossil record. However, seagrass itself hardly fossilizes and therefore we are searching for indirect indicators to recognize ancient seagrass vegetation. In this contribution we review molluscan evidence for palaeo-seagrass settings. Indicator species are rare since the majority of seagrass associated molluscs occurs in other marine habitats as well. Furthermore, those habitats appear to be patchy, both spatial and temporal, resulting in mixed occurrences of seagrass and non-seagrass faunas. Often only the high abundance of certain mollusc groups and the general taxonomic composition of a fauna points to seagrass environments. However, the distribution of gastropod trophic guilds in species richness versus abundance data appears to yield patterns that may be very characteristic for the identification of fossil seagrass associated faunas. We are currently applying Indirect PaleoSeagrass Indicators (IPSI’s) to a number of fossil and modern shelly samples, both from seagrass and non-seagrass environments. We also briefly review potential sedimentary and geochemical IPSI’s as well as fossil groups different than molluscs. Identifying seagrass environments enables us to assess diversity trends in such ecosystems through time and to study their response over time intervals with major environmental and climate change.
1 aReich, Sonja uhttps://ipaeg.myspecies.info/node/206102246nas a2200121 4500008004100000245014000041210006900181260003200250520176600282100001602048700001702064856004302081 2012 eng d00aDiversity, abundance and taphonomic patterns across bivalve dead assemblages associated with sea grass beds, San Salvador, the Bahamas0 aDiversity abundance and taphonomic patterns across bivalve dead aCharlotte, North Carolina. 3 aSeagrass ecosystems play an important role in sedimentation processes and nutrient cycling and support local biodiversity by providing food and shelter for numerous associated organisms. These ecosystems have been around since the Late Cretaceous. In order to understand their emergence in geological time and their response to past perturbations we have to be able to recognize seagrass communities in the fossil record. However, seagrass itself hardly fossilizes and therefore we are searching for indirect indicators to recognize ancient seagrass vegetation. In this contribution we review molluscan evidence for palaeo-seagrass settings. Indicator species are rare since the majority of seagrass associated molluscs occurs in other marine habitats as well. Furthermore, those habitats appear to be patchy, both spatial and temporal, resulting in mixed occurrences of seagrass and non-seagrass faunas. Often only the high abundance of certain mollusc groups and the general taxonomic composition of a fauna points to seagrass environments. However, the distribution of gastropod trophic guilds in species richness versus abundance data appears to yield patterns that may be very characteristic for the identification of fossil seagrass associated faunas. We are currently applying Indirect PaleoSeagrass Indicators (IPSI’s) to a number of fossil and modern shelly samples, both from seagrass and non-seagrass environments. We also briefly review potential sedimentary and geochemical IPSI’s as well as fossil groups different than molluscs. Identifying seagrass environments enables us to assess diversity trends in such ecosystems through time and to study their response over time intervals with major environmental and climate change.
1 aCecares, B.1 aReich, Sonja uhttps://ipaeg.myspecies.info/node/206001559nas a2200133 4500008004100000245004900041210004900090260001400139520115700153100002801310700002501338700001901363856004301382 2012 eng d00aOrigins of coral diversity in Southeast Asia0 aOrigins of coral diversity in Southeast Asia aAmsterdam3 aSoutheast 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.
1 aSantodomingo, Nadiezhda1 aJohnson, Kenneth, G.1 aRenema, Willem uhttps://ipaeg.myspecies.info/node/204700598nas a2200145 4500008004100000245009300041210006900134260003000203100002600233700001700259700001400276700001800290700002500308856011900333 2012 eng d00aThermocline temperature variability in the Timor Strait over the last two glacial cycles0 aThermocline temperature variability in the Timor Strait over the aSan Franciscoc03/12/20121 aCappelli, Lo, Giudice1 aHolbourn, A.1 aKuhnt, W.1 aRegenberg, M.1 aGarbe-Schoenberg, D. uhttps://ipaeg.myspecies.info/content/thermocline-temperature-variability-timor-strait-over-last-two-glacial-cycles00474nas a2200109 4500008004100000245007700041210006900118260004700187100002800234700002500262856007700287 2012 eng d00aUnderstanding the murky origins of coral diversity in the Coral Triangle0 aUnderstanding the murky origins of coral diversity in the Coral aZoological Society of London, UKc01/12/121 aSantodomingo, Nadiezhda1 aJohnson, Kenneth, G. uhttp://static.zsl.org/files/rcuk-abstract-booklet-and-programme-2051.pdf02236nas a2200121 4500008004100000245007300041210006900114520176600183100001701949700002601966700001901992856010302011 2012 eng d00aMollusk faunas as indirect indicators for palaeo-seagrass vegetation0 aMollusk faunas as indirect indicators for palaeoseagrass vegetat3 aSeagrass ecosystems play an important role in sedimentation processes and nutrient cycling and support local biodiversity by providing food and shelter for numerous associated organisms. These ecosystems have been around since the Late Cretaceous. In order to understand their emergence in geological time and their response to past perturbations we have to be able to recognize seagrass communities in the fossil record. However, seagrass itself hardly fossilizes and therefore we are searching for indirect indicators to recognize ancient seagrass vegetation. In this contribution we review molluscan evidence for palaeo-seagrass settings. Indicator species are rare since the majority of seagrass associated molluscs occurs in other marine habitats as well. Furthermore, those habitats appear to be patchy, both spatial and temporal, resulting in mixed occurrences of seagrass and non-seagrass faunas. Often only the high abundance of certain mollusc groups and the general taxonomic composition of a fauna points to seagrass environments. However, the distribution of gastropod trophic guilds in species richness versus abundance data appears to yield patterns that may be very characteristic for the identification of fossil seagrass associated faunas. We are currently applying Indirect PaleoSeagrass Indicators (IPSI’s) to a number of fossil and modern shelly samples, both from seagrass and non-seagrass environments. We also briefly review potential sedimentary and geochemical IPSI’s as well as fossil groups different than molluscs. Identifying seagrass environments enables us to assess diversity trends in such ecosystems through time and to study their response over time intervals with major environmental and climate change.
1 aReich, Sonja1 aWesselingh, Frank, P.1 aRenema, Willem uhttps://ipaeg.myspecies.info/content/mollusk-faunas-indirect-indicators-palaeo-seagrass-vegetation00512nas a2200121 4500008004100000245008700041210006900128100002100197700002100218700001800239700002000257856011300277 2012 eng d00aTropical convection variability in the West Pacific Warm Pool over the past 120kyr0 aTropical convection variability in the West Pacific Warm Pool ov1 aFraser, Nicholas1 aBolliet, Timothe1 aHolbourn, Ann1 aKuhnt, Wolfgang uhttps://ipaeg.myspecies.info/content/tropical-convection-variability-west-pacific-warm-pool-over-past-120kyr02403nas a2200133 4500008004100000245009300041210006900134260003000203520183900233100001702072700002802089700001902117856013302136 2012 eng d00aLarger benthic foraminifera – faunal pioneers in mixed carbonate-siliciclastic systems0 aLarger benthic foraminifera faunal pioneers in mixed carbonatesi aCharlotte, NCc04/11/20123 aLarger benthic foraminifera are one of the most abundant and widespread organisms in shallow marine tropical environments. Their role as rapid colonizers of new substrates has been suggested, but little is still known to support this idea. To address this question, larger benthic foraminifera assemblages have been studied in the paleoenvironmental reconstruction of a Langhian (Middle Miocene) shallow-water patch reef, as part of a broader multitaxon fossil comunity analysis, including corals, coralline algae, and bryozoans. The studied outcrop (approx. 80 m wide and 25 m thick) is located at the northeast margin of the Kutai Basin near Bontang (Indonesia). The patch-reef was developed in mixed carbonate-siliciclastic depositional environment and despite the high terrigenous input affecting water transparency, this reef contains a diverse marine biota. Five different facies types were distinguished based on lithology and fossil content: foraminifera packstone, bioclastic packstone with foralgal communities, thin-platy coral sheetstone, platy-tabular coral platestone, and shales. Excluding the fossil barren shales facies, only larger benthic foraminifera occur in all four remaining facies types, showing the ability to rapidly adapt to changes in environment. In the current study, high siliciclastic input caused fluctuations in light levels, but also resulted in deposition of soft-bottom substrate. In newly developed conditions, the larger benthic foraminifera appear first and mark the initiation of reef growth. The persistence of LBF throughout the fossil reef succession indicates their high tolerance to terrigenous input and also highlight the role of foraminifera as primary colonizers, proving themselves as important faunal pioneers, particularly in mixed carbonate-siliciclastic systems.1 aNovak, Vibor1 aSantodomingo, Nadiezhda1 aRenema, Willem uhttps://ipaeg.myspecies.info/content/larger-benthic-foraminifera-%E2%80%93-faunal-pioneers-mixed-carbonate-siliciclastic-systems03029nas a2200133 4500008004100000245009200041210006900133260002300202520247700225100001702702700001902719700002902738856012802767 2012 eng d00aBurdigalian turbid water patch reef environment revealed by larger benthic foraminifera0 aBurdigalian turbid water patch reef environment revealed by larg aViennac22/04/20123 aAncient isolated patch reefs outcropping from siliciclastic sediments are a trademark for the Miocene carbonate deposits occurring in East Kalimantan, Indonesia. They develop in transitional shelf sediments deposited between deltaic and deep marine deposits (Allen and Chambers, 1998). The Batu Putih Limestone (Wilson, 2005) and similar outcrops in adjacent areas have been characterized as shallow water carbonates influenced by high siliciclastic input, showing low relief patch reefs in turbid waters. Larger benthic foraminifera (LBF) are excellent markers for biochronology and paleoenvironmental reconstruction. This study aims to reveal age and paleoenvironment of a shallow water carbonate patch reef developed in mixed depositional system by using LBF and microfacies analysis. The studied section is located near Bontang, East Kalimantan, and is approximately 80 m long and 12 m high. It is placed within Miocene sediments in the central part of the Kutai Basin. Patch reef and capping sediments were logged through eight transects along section and divided into nine different lithological units from which samples were collected. Thin sections and isolated specimens of larger benthic foraminifera were analyzed and recognized to species level (where possible) providing age and environmental information. Microfacies analysis of thin sections included carbonate classification (textural scheme of Dunham, 1962) and assemblage composition of LBF, algae and corals relative abundance. Three environmentally indicative groups of LBF were separated based on test morphology, habitat or living relatives (Hallock and Glenn, 1986). Analysed foraminifera assemblage suggests Burdigalian age (Tf1). With use of microfacies analysis nine successive lithological units were grouped into five facies types. Paleoenvironmental reconstruction of LBF fossil assemblage indicate two cycles of possible deepening recorded in the section. Based on high muddy matrix ratio in analyzed thin-sections we still cannot conclude whether they were deeper water assemblage, or that they occurred in shallower water and influenced by turbid conditions as the result of terrigenous input. According to preliminary analysis and siliciclastic content in the sediments the later one should be more likely. Further work will include additional fossil groups analysis (corals, algae and bryozoans), detailed petrographical analysis and Strontium isotope stratigraphy.1 aNovak, Vibor1 aRenema, Willem1 aProject, the, Throughflo uhttps://ipaeg.myspecies.info/content/burdigalian-turbid-water-patch-reef-environment-revealed-larger-benthic-foraminifera-000488nas a2200133 4500008004100000245006100041210006100102260003800163100002500201700001700226700001900243700002300262856006900285 2012 eng d00aTowards a synthesis of Cenozoic pantropical paleontology0 aTowards a synthesis of Cenozoic pantropical paleontology aCairns, Australiac8-13 July 20121 aJohnson, Kenneth, G.1 aKlaus, James1 aRenema, Willem1 aTodd, Jonathan, A. uhttp://www.icrs2012.com/Downloads/ICRS2012_Book_of_Abstracts.pdf00503nas a2200133 4500008004100000245004900041210004900090260004700139100002800186700002500214700001900239700002900258856008200287 2012 eng d00aOrigins of coral diversity in Southeast Asia0 aOrigins of coral diversity in Southeast Asia aAmsterdam, The Netherlandsc1-6 April 20121 aSantodomingo, Nadiezhda1 aJohnson, Kenneth, G.1 aRenema, Willem1 aProject, the, Throughflo uhttps://ipaeg.myspecies.info/content/origins-coral-diversity-southeast-asia-002264nas 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-asia00573nas a2200157 4500008004100000245007400041210006900115260004200184653001200226653001300238653001400251653001400265100002000279700002500299856009100324 2012 eng d00aAn overview of the Cenozoic fossil record of bryozoans in the tropics0 aoverview of the Cenozoic fossil record of bryozoans in the tropi aCharlotte, North Carolinac04/11/201210aBRYOZOA10aCenozoic10aEvolution10aTaphonomy1 aTaylor, Paul, D1 aDi Martino, Emanuela uhttps://ipaeg.myspecies.info/content/overview-cenozoic-fossil-record-bryozoans-tropics00771nas 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-bryozo00682nas a2200181 4500008004100000245008700041210006900128260001500197100001700212700002800229700001800257700002500275700002000300700002000320700002500340700001900365856011600384 2012 eng d00aEnvironmental reconstruction of a Langhian patch reef (East Kalimantan, Indonesia)0 aEnvironmental reconstruction of a Langhian patch reef East Kalim c29/03/20121 aNovak, Vibor1 aSantodomingo, Nadiezhda1 aRösler, Anja1 aDi Martino, Emanuela1 aBraga, Juan, C.1 aTaylor, Paul, D1 aJohnson, Kenneth, G.1 aRenema, Willem uhttps://ipaeg.myspecies.info/content/environmental-reconstruction-langhian-patch-reef-east-kalimantan-indonesia00669nas 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-indonesia00401nas a2200109 4500008004100000245004200041210004100083260005100124100002500175700002000200856007100220 2012 eng d00aLiving fossils: a view from bryozoans0 aLiving fossils a view from bryozoans aThe Natural History Museum, Londonc27/03/20121 aDi Martino, Emanuela1 aTaylor, Paul, D uhttps://ipaeg.myspecies.info/content/living-fossils-view-bryozoans00551nas a2200121 4500008004100000245010400041210006900145260002200214100001800236700002200254710002400276856012900300 2012 eng d00aHigh-resolution palaeoenvironmental records from Miocene patch reefs from SE-Kalimantan (Indonesia)0 aHighresolution palaeoenvironmental records from Miocene patch re aCairns, Australia1 aWarter, Viola1 aMüller, Wolfgang1 aThroughflow Network uhttps://ipaeg.myspecies.info/content/high-resolution-palaeoenvironmental-records-miocene-patch-reefs-se-kalimantan-indonesia