155 research outputs found
DEPTH DISTRIBUTION OF LARGER BENTHIC FORAMINIFERA IN DIFFERENT TROPHIC ENVIRONMENTS: UNLOCKING ENVIRONMENTAL VARIATIONS IN THE PAST
No full textThis PhD project has dealt with modern benthic foraminifera of Brunei from the nearshore shallow shelf locality and offshore carbonate atolls as well as fossil benthic foraminifera from an onshore locality. Identification of benthic foraminifera from both modern and fossil localities was done by assessing their taxonomy and systematics within the Indo-Pacific region. The importance of Brunei in the Indo-Pacific region was due to the fact that it is located at the edge of the Coral Triangle, which is the modern marine biodiversity hotspot of today. Benthic foraminifera from Brunei were understudied and recent findings have shown promising results on Brunei’s benthic foraminifera diversity. Within the modern localities, a total of 231 species of benthic foraminifera are found nearshore Brunei and 60 species on the carbonate atolls.
There are species of benthic foraminifera from the modern localities which have shown different patterns of distribution as a result of environmental parameters such as substrate type, light intensity and hydrodynamics which change in different trophic conditions. The results revealed the difference in distribution of key species, Operculina ammonoides, Amphisorus hemprichii and Parasorites orbitolitoides from both nearshore Brunei and carbonate atolls. Furthermore, there are also other species of larger benthic foraminifera that have different depth distributions in both nearshore Brunei and carbonate atolls from the family Calcarinidae, Amphisteginidae and Nummulitidae. Smaller benthic foraminifera such as Pseudorotalia and Asterorotalia which are found in the nearshore locality display different depth distributions due to the difference in sediment composition. Therefore, these results can be used to compare benthic foraminifera distribution from different trophic conditions in carbonate and mixed carbonate-siliciclastic environments.
A study conducted on fossil locality in the Lumapas area in the Brunei-Muara district observed the presence of larger benthic foraminifera. Geologically, Brunei’s sedimentology is mainly made up of sandstone and clay but only one locality with a limestone bed was found. From the available thin sections, only one species of larger benthic foraminifera was present and identified from the genus Miogypsina and its taxonomy was determined by comparing other conducted studies within the region. Similarly, to Miogypsina, there were different genera of corals identified from the Lumapas limestone bed which have been known to live in turbid water conditions. These results have provided insight of possible palaeoenviornmental conditions in Lumapas. However, more sampling and observation is required to further understand Brunei’s paleoenvironment during the Miocene in a mixed carbonate-siliciclastic condition. Subsequently, other projects have been simultaneously conducted towards the development of understanding the palaeoenvironment of Brunei by assessing modern and fossil localities.
A study made on two transects (Muara and Tutong) focused on the sedimentological characterization throughout the core samples with depth whereby both transects have shown different sediment compositions which have been influenced by the river discharging fine sediments from inland towards the marine shelf. Biogenic components were also studied from both transects where benthic foraminifera flourish and it was found that they have different distributional patterns due to varying sediment compositions despite their presence at the same depth in both transects. This led to the building of a taxonomic data of benthic foraminifera within the shelf environment of Brunei in addition to the studies made on benthic foraminifera from reef and wreck sites in the same area.
A study was also conducted on fossil localities onshore Brunei for their palaeontological and sedimentological characteristics where fossil foraminifera have been reported. The fossil localities are made up of different environments from shoreface to offshore marine settings where different genera of rotaliids were found. The genera found are Elphidium, Bolivina, Ammonia, Pseudorotalia, Asterorotalia and Operculina which have been known to be associated with muddy to sandy sediments where these rotaliids are also present today in the modern marine waters of Brunei.
There is also a study on Palynology that was carried out by using pollen and spores for palaeoenvironment interpretation and although this study does not relate to foraminifera, it has played a role in further understanding the past environment of Brunei during the Neogene. These onshore fossil localities have an origin of a mangrove to marine environmental setting which can also be observed in Brunei today. Therefore, with all these studies integrated together, by studying both modern and fossil localities of Brunei, these results could give the complete representation on the palaeoenvironment of Brunei during the Neogene.
Rotaliids have been very important in determining the palaeoenvironment as they have shed a light on how their depth distribution can vary depending on substrate type, light intensity and water movement in different trophic conditions. Having a taxonomic baseline of benthic foraminifera spanning from different marine environments such as the marine shelf, reefs, lagoons, deltas within various depths that consists of different substrate composition in a fully carbonate or mixed siliciclastic condition can be used as a guide for future studies within the region and can be used in unlocking and understanding the environmental variations of Brunei in the past
Midterm Process Evaluation: Supporting Workforce Training and Development for Deaf Youth in Jamaica
No full textDumaine, Logan; Heerema, Ashley; Makasini, Sulia; Reshetova, Olga; Yeo, Sarah. (2012). Midterm Process Evaluation: Supporting Workforce Training and Development for Deaf Youth in Jamaica. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/123487
Reophax bruneiensis n. sp. From the shallow-water environment of Brunei Darussalam
No full textAnew species of Reophax is documented from the shallow marine settings offshore Brunei Darussalam. The new taxon differs from other recent species of Reophax by its selective agglutination consisting mainly of tests of megalospheric specimens of Amphistegina. Reophax bruneiensis n.sp. differs from other known species in having a selectively agglutinated wall, few numbers of chambers increasing rapidly in size, and a terminal aperture not supported by any neck. This new species possibly acts as detritivore within the bottom sediments characterized by differentiated calcareous bioclasts and clay-sized siliciclasts derived by the river supply
First record of the Sulia glaesaria Simutnik, 2015 (Hymenoptera, Chalcidoidea, Encyrtidae) from Rovno amber
No full textSulia glaesaria Simutnik, 2015 (Chalcidoidea, Encyrtidae), originally described from late Eocene Danish amber, is reported in coeval Rovno amber. A revised diagnosis of this genus is provided based on the new specimen and high-resolution photomicrographs of the holotype. Some character states, such as a short radicle, clypeus with long lateral margins, the presence of a strigil and basitarsal comb, spur vein of the hind wing, costal cell of hind wing along entire marginal vein with single line of long setae, and almost vertical syntergum with abruptly reflexed extension apically are reported in this species for the first time
Plan de mejora en los procesos administrativos de la entidad Mutual Vitivinícola
No full textEl rubro de beneficios y financiamiento en locales adheridos a la Mutual Vitivinícola ha sido el objeto de estudio del presente trabajo planteando una insatisfacción en los socios y la falta de agilidad en el proceso de órdenes de compras digitales que respaldan al rubro en cuestión. Con el objeto de mejorar dicho proceso, se ha estudiado y guiado por Harrington para determinar la situación actual del proceso y poder idear un plan de mejora desde la elección de un equipo de trabajo, la misión bajo la cual se busca la mejora, las posibles soluciones a las barreras encontradas, hasta la aplicación de un sistema de retroalimentación y la constante búsqueda de mejora.
Una mutual es una entidad de la Economía Social y Solidaria, mejor conocida como economía del tercer sector, que se basa en el principio de la asistencia mutua con el objeto social de brindar ayuda y apoyo mutuo a todos sus asociados brindándoles servicios tales como proveeduría, servicio fúnebre, ayuda económica, ordenes de compras, entre otros. Como toda entidad, tiene procedimientos que hacen de su eficiencia, efectividad y adaptabilidad que le permite competir y sobrevivir en el entorno.
Con el fin de lograr una mejora en el proceso empresarial administrativo de órdenes de compras digitales se analiza desde el punto de vista cualitativo, recolectando información mediante la observación directa junto con el apoyo de trabajos equivalentes y apuntes de cátedras involucradas.
Luego de la aplicación de la guía de MPE de Harrington se logra mejorar el proceso disminuyendo barreras tales como la burocracia, tiempo de ciclo, logrando una simplificación del proceso haciéndolo mas ágil, con una mayor satisfacción en los asociados y una oportunidad de mejora continua.Fil: Sulia, Valeria Martina. Universidad Nacional de Cuyo. Facultad de Ciencias Económicas
Tracing migration of larger benthic foraminifera across atolls in the South China Sea
No full textThe distribution of modern benthic foraminifera is studied from offshore reefs of Brunei Darussalam located in northwest Borneo with enhanced siliclastic influence, and from Louisa Reef, an atoll in the Southern Spratly Islands under fully carbonatic environment. The main families of larger benthic foraminifera found from offshore reefs of Brunei are the Calcarinidae, Amphisteginidae and the Operculinidae, while at the Louisa Reef are the Calcarinidae, Amphisteginidae and the Soritidae. Larger benthic foraminifera are mainly concentrated in the tropical regions and in shallow waters, and their distribution depends on important environmental factors such as water depth, sunlight and type of sediment. Migration of LBF has been recorded since the Paleogene from the Americas to Africa and the Mediterranean Sea, and later to the Indo-Pacific where the modern biodiversity hotspot occurs. Hence looking into any possible migration throughout certain groups of LBF could help in understanding their biogeographic distribution through time within the Indo-Pacific region. Along the atolls in South China Sea the marine environments meet their living preferences, hence tracing their presence, distributions, and abundances could shed further light on their regional migration pattern
Preliminary data on the depth distribution of modern larger benthic foraminifera offshore Brunei Darussalam
No full textModern Foraminifera from a depth transect offshore Brunei Darussalam: diversity, sedimentation rate and preservation pathways.
No full textPalynology of miocene sediments in brunei darussalam: First SEM investigations of pollen and spores, and their taxonomy and palaeoenvironmental interpretation
No full textBrunei Darussalam’s geology is characterized by extensive Neogene fluvio-deltaic to shallow marine siliciclastic deposits, which have been studied here to highlight their palynological content. So far, there are only few reports that investigate fossil pollen and only one focuses on detailed taxonomical description using light microscopy (LM). The rest are studies on a wider regional scale in northwest Borneo sometimes including Brunei but without much emphasizes on taxonomy. To investigate pollen thoroughly, the use of scanning electron microscopy (SEM) is important, as this can provide valuable information on the sculptures of the pollen grains which with LM alone cannot be observed. Our study here provides LM images alongside the first SEM images of pollen and spores from Miocene sediments in Brunei Darussalam. The results point to a moderate-diverse flora comprising 37 families and 62 pollen and spore taxa. Most common ones are mangrove types which are Rhizophoraceae and Lythraceae taxa. The families of Combretaceae, Malvaceae, and other less common pollen groups are typical of tropical floral elements. The recovered families of Anacardiaceae, Arecaceae (five taxa), Calophyllaceae, Dilleniaceae, Dipterocarpaceae (two taxa), Elaeocarpaceae, Euphorbiaceae (four taxa), Phyllanthaceae (two taxa), Podocarpaceae, Proteaceae, Rubiaceae, Sapindaceae and Sapotaceae indicate mixed Dipterocarpaceae forests ranging from hinterland to peat swamp areas
Depth distribution and substrate selection of modern larger benthic foraminifera offshore Brunei Darussalam
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