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Dissertations / Theses on the topic 'Sub-tropical'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Engelbrecht, Nicolaas Carel Marthinus. "Foggage value of sub-tropical grasses." Diss., University of Pretoria, 2002. http://hdl.handle.net/2263/28505.

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The use of foggage as winter feed for animal maintenance is unlikely to totally replace hay and/or silage, but should be used as an alternative for the early winter. The most important objective in producing foggage is to feed animals to at least maintain body weight through the winter season. As foggage is generally not a high quality feed, it usually can not be used for producing animals without supplementation. Using foggage can also mininise expensive inputs, such as labour and machinery. This is the single most outstanding advantage of using pasture foggage over hay, haylage, crop residue

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2

Bakmeedeniya, Lekha Udayanganie. "MODELLING POLYGENERATION WITH DESICCANT COOLING SYSTEM FOR TROPICAL (AND SUB - TROPICAL) CLIMATES." Thesis, KTH, Energiteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-43253.

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Modelling Polygeneration with Desiccant Cooling System for Tropical(and Sub Tropical) ClimatesAbstractSpace cooling has become a necessity in tropical countries. Maintainingcomfortable indoor conditions in industrial environments incur high energy bills due toheavy dependency on electrically operated air conditioning systems. In order to exploreways and means to improve the energy efficiency and alternative energy resources, afeasibility study was conducted using a transient simulation software TRNSYS toimplement a combined cooling, heating and power system suitable for a tropicalcountry.It is

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3

Al-Yazeedi, Saleh Ali Bin Shiekhan. "Epidemiology of foot infection in a sub-tropical climate." Thesis, King's College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286319.

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4

Newham, Michael John. "Nitrate Retention and Removal in Sub-Tropical Riparian Zones." Thesis, Griffith University, 2011. http://hdl.handle.net/10072/366141.

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Worldwide, contamination of streams and groundwater with excess nitrate has been linked to agricultural land use and particularly to the application of nitrogen fertilisers to increase agricultural production. Nitrate is an effective contaminant in agricultural areas; it is highly mobile, having a low affinity for soil sorption, and so moves with runoff and sub-surface flows. Excess nitrate can cause ecological impacts on waterways and coastal receiving water through eutrophication and, in some cases, contributes to coastal ‘dead zones’. Nitrate also has toxicological effects on aquatic organi

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5

Breedt, Machiel Christoffel. "Gold exploration in tropical and sub-tropical terrains with special emphasis on Central and Western Africa." Thesis, Rhodes University, 1996. http://hdl.handle.net/10962/d1005578.

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The aim of this dissertation is an attempt to' provide a general guide for future gold exploration in tropical and sub-tropical terrains. The dissertation includes a brief discussion of the various exploration techniques used in regional and local exploration. This provide the necessary background knowledge to discriminate between the constraints and applications and to be able to select the techniques which are more suitable for gold exploration in tropical and sub-tropical terrains. Weathering, gold geochemistry and soil formation, fields often neglected, are emphasized to illustrate the imp

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6

Boucek, Ross E. "Investigating Sub-tropical Community Resistance and Resilience to Climate Disturbance." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2993.

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Changes in global climate will likely increase climate variability. In turn, changes in climate variability have begun to alter the frequency, intensity, and timing of climate disturbances. Continued changes in the climate disturbance regime experienced by natural systems will undoubtedly affect ecological processes at every hierarchical scale. Thus, in order to predict the dynamics of ecological systems in the future, we must develop a more mechanistic understanding of how and in what ways climate disturbance affects natural systems. In South Florida, two climate disturbances recently affecte

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7

Walkington, Ian A. "Wind and bouyancy driven models of sub-tropical ocean gyres." Thesis, Keele University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397658.

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Paul, Miriam. "Restoring Rainforest – the Capacities of Three Different Reforestation Pathways to Re-establish Ecosystem Properties." Thesis, Griffith University, 2011. http://hdl.handle.net/10072/366066.

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The broad scale destruction of tropical and subtropical rainforests has been one of the largest land-cover conversions taking place on earth, with a wide range of deleterious consequences at local, landscape, and global scales. While the resulting loss of biodiversity and habitat for rainforest-dependent fauna and flora has been well-studied as a major effect, clearing of rainforests also significantly influences soil processes such as biochemical cycles and microbial functions. More recently, there has been a growing public interest in reforestation activities. There are a range of different

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9

Kavanagh, Lydia Jane. "An engineered ecosystem for environmentally sustainable wastewater treatment for remote tourist resorts in tropical/sub-tropical regions /." [St. Lucia, Qld.], 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16958.pdf.

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10

Honey, David James. "Heme b in marine cyanobacteria and the (sub-) tropical North Atlantic." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/359063/.

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Heme b is the iron containing prosthetic group to an important pool of iron proteins known as the hemoproteins. Hemoproteins are functionally diverse, playing key roles in photosynthetic and respiratory electron transfer (e.g. cytochrome b6f, photosystem II, cytochrome bc1) among other fundamental biological processes. Heme b is the most naturally abundant heme structure, but data regarding hemes in the marine environment are limited. An investigation has been conducted to improve our understanding of heme b abundance in marine organisms through laboratory monoculture studies of three marine c

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Matla, Matsoele Moses. "Helminth ichthyo-parasitic fauna of a South African Sub-Tropical Lake." Thesis, University of Limpopo (Turfloop Campus), 2012. http://hdl.handle.net/10386/822.

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Thesis (Ph.D. (Zoology)) --University of Limpopo, 2012<br>The diversity of the helminth parasites of fishes in a clear-water, subtropical Lake Tzaneen, in South Africa was investigated. Of the 527 fish specimens sampled approximately 9000 parasites were collected. There are 38 different parasite species discussed comprising 27 Monogenea, 3 Digenea, 4 Cestoda, 3 Nematoda and 1 Acanthocephala. Four new monogenean species are described and these are Dactylogyrus spp. 1 to 4. Three monogenean species are introduced as first records in Africa and these are Actinocleidus fusiformis (Mueller, 1

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12

Bai, Shahla Hosseini. "The Impact of Site Management Practices on the Revegetation of Highly Disturbed Sites in Sub-Tropical and Tropical Queensland." Thesis, Griffith University, 2012. http://hdl.handle.net/10072/366823.

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Revegetation schemes are increasing in Australia and are part of strategy to restore cleared lands, enhance biodiversity and alleviate global climate change. Site preparation practices play a pivotal role in the successful establishment of revegetation projects in tropical and sub-tropical Australia. However, site preparation practices are costly and there is great interest to develop cost-effective establishment methods. The most common site preparation practices, in Australia, include weed control and fertilisation. Reduced weed competition is a crucial factor in the successful establishment

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Maunsell, Sarah. "Food Webs along Elevational Gradients: Interactions among Leaf Miners, Host Plants and Parasitoids in Australian Subtropical Rainforest." Thesis, Griffith University, 2014. http://hdl.handle.net/10072/368145.

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Gradients in elevation are used to understand how species respond to changes in local climatic conditions and are therefore a powerful tool for predicting how mountain ecosystems may respond to climate change. While many studies have shown elevational patterns in species richness and species turnover, little is known about how multi-species interactions respond to elevation. An understanding of how species interactions are affected by current clines in climate is imperative if we are to make predictions about how ecosystem function and stability will be affected by climate change. This chall

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McKenzie-Smith, Fiona Julie, and n/a. "Habitat and Hydrological Variability in Sub-Tropical Upland Streams in South-East Queensland." Griffith University. Australian School of Environmental Studies, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20030725.142256.

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Headwater streams are extremely vulnerable to the consequences of land-use change as they are tightly coupled with the surrounding landscape. Understanding the natural processes that influence the structure and function of these ecosystems will improve our understanding of how land-use change affects them. Benthic substratum habitat was investigated in a sub-tropical headwater stream by quantifying temporal change to sediment texture of surface sediments (less than 10cm), over four years. Hydrological characteristics were also surveyed in detail, as hydrological regime is a primary determinan

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McKenzie-Smith, Fiona Julie. "Habitat and Hydrological Variability in Sub-Tropical Upland Streams in South-East Queensland." Thesis, Griffith University, 2003. http://hdl.handle.net/10072/366461.

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Headwater streams are extremely vulnerable to the consequences of land-use change as they are tightly coupled with the surrounding landscape. Understanding the natural processes that influence the structure and function of these ecosystems will improve our understanding of how land-use change affects them. Benthic substratum habitat was investigated in a sub-tropical headwater stream by quantifying temporal change to sediment texture of surface sediments (less than 10cm), over four years. Hydrological characteristics were also surveyed in detail, as hydrological regime is a primary determinan

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Barton, Andrew P. "Soil erosion and conservation on arable sub-tropical ultisols in Yunnan province, China." Thesis, University of Wolverhampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310709.

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Gonçalves, Daniel Ruiz Potma. "Soil carbon balance in long-term no-till in a sub-tropical environment." Universidade Estadual de Ponta Grossa, 2018. http://tede2.uepg.br/jspui/handle/prefix/2525.

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Submitted by Angela Maria de Oliveira (amolivei@uepg.br) on 2018-06-05T17:14:26Z No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) Daniel Ruiz Potma.pdf: 3450096 bytes, checksum: 03d21d00bc051ccb6c35ac3df1c5fe14 (MD5)<br>Made available in DSpace on 2018-06-05T17:14:26Z (GMT). No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) Daniel Ruiz Potma.pdf: 3450096 bytes, checksum: 03d21d00bc051ccb6c35ac3df1c5fe14 (MD5) Previous issue date: 2018-04-18<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<b

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Snow, J. T. "The environmental, elemental and proteomic plasticity of Trichodesmium in the (sub) tropical Atlantic." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/374241/.

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Phytoplankton dominate surface ocean biomass and have major roles in global carbon and nutrient cycling. Of these, the cyanobacterial Trichodesmium sp. are considered the dominant and most conspicuous nitrogen fixers in the tropical and subtropical oceans, regimes frequently characterised by low concentrations of fixed nitrogen. Despite being arguably the best studied marine diazotroph, the factors controlling the distribution and growth of Trichodesmium remain a subject of debate, with sea surface temperature, the partial pressure of CO2 and nutrients including iron and phosphorus, all sugges

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de, Putron Samantha Julie. "The reproductive ecology of two corals and one gorgonian from sub-tropical Bermuda." Thesis, Swansea University, 2003. https://cronfa.swan.ac.uk/Record/cronfa42702.

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This study examines the sexual reproductive ecology of three species of corals common on the sub-tropical reefs of Bermuda: the scleractinians Porites astreoides and Madracis mirabilis, and the gorgonian Pseudoplexaura porosa. The reproductive biology of corals in Bermuda is of particular interest because low winter seawater temperatures and geographical isolation make it an extreme of distribution for many of the species there. In addition, the Bermuda platform comprises reef zones that experience gradients of temperature, sediment loading and wave intensity at the different depths. The objec

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Blazer, Mark A. "Architectural strategies in reducing heat gain in the sub-tropical urban heat island." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002781.

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21

O'Hanlon, Eoghain Rua Patrick Allen O'Hanlon. "Evaluating the Effectiveness of Stormwater Quality Improvement Devices (SQIDs) in Sub-Tropical Conditions." Thesis, Griffith University, 2012. http://hdl.handle.net/10072/366913.

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Stormwater quality improvement devices (SQIDs) are frequently installed to improve the water quality of runoff to match particular water quality objectives (WQOs). However, there is a lack of data to evaluate the functioning and performance of these systems, particularly in sub-tropical climates. The primary aim of this study was to collect such data. Another aim was to establish baseline monitoring of an urban catchment before the installation of SQIDs and to forecast the improvement to the water quality after installation. This study investigates the performance of two SQIDs (a pond and wetl

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22

Clough, Elizabeth Anne, and n/a. "Factors Influencing Ant Assemblages and Ant Community Composition in a Sub-Tropical Suburban Environment." Griffith University. School of Environmental and Applied Science, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040719.141317.

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The main objective of this study was to examine the abundance and diversity of ants in suburban sites following vegetation removal or modification for development. This research examines the capacity of suburban sites to support ant diversity, which is dependent on the site characteristics and their surrounding environment. The study focused on 29 suburban garden and 3 suburban reserve sites on the Gold Coast, Queensland, Australia. This region, through continuing land development, undergoes ongoing habitat disturbance and modification. Ground-dwelling ants were collected by pitfall trapping

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23

Roberge, Alain. "Analysis of intense sub-tropical moisture transports into high latitudes of western North America." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=19280.

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There can often be significant interactions between high and tropical latitudes during the Northern Hemisphere's cold season. In periods of amplified atmospheric flow, these interactions can lead to the poleward transport of significant tropical moisture from near Hawaii into northwestern North America. These are pineapple express (PE) events. This study documents the synoptic-scale signatures associated with the PE. A trajectory analysis was used to partition the events into three different synoptic types according to the

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Coles, David P. "Dusk transition in sub-tropical reef fish communities off of North and South Carolina." Thesis, College of Charleston, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1565212.

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<p> Although dawn and dusk periods comprise a relatively small part of the day, their importance as key ecological transition periods has been recognized for some time. Previous marine investigations into this transition have focused on tropical locations and have mostly been qualitative in nature. This project focused on the dusk period in sub-tropical reef fish communities off the coasts of North and South Carolina. High-definition underwater video was collected in 2013 and 2014 at a variety of sites featuring natural live-bottom habitat. Independent samples (43 videos) were obtained on 17 s

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Clough, Elizabeth Anne. "Factors Influencing Ant Assemblages and Ant Community Composition in a Sub-Tropical Suburban Environment." Thesis, Griffith University, 2004. http://hdl.handle.net/10072/366528.

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The main objective of this study was to examine the abundance and diversity of ants in suburban sites following vegetation removal or modification for development. This research examines the capacity of suburban sites to support ant diversity, which is dependent on the site characteristics and their surrounding environment. The study focused on 29 suburban garden and 3 suburban reserve sites on the Gold Coast, Queensland, Australia. This region, through continuing land development, undergoes ongoing habitat disturbance and modification. Ground-dwelling ants were collected by pitfall trapping

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26

Kashfi, Syeed Anta. "Investigating variation in bus ridership rates within localised areas of a sub-tropical city." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/92993/1/Syeed%20Anta_Kashfi_Thesis.pdf.

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This thesis makes a significant contribution to knowledge and understanding of 'Human Travel Behaviour' in relation to transportation research. It holds some important merits that have not been proposed before. It develops a new, comprehensive and meaningful relationship that includes bus transit ridership change due to weather variables, seasonality and transit quality of service within a single daily ridership rate estimation model. The research incorporated both temporal and spatial influences on ridership within a modelling structure, named as the Nested Model Structure. It provides a comp

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27

Guastella, Devid. "Studies on whiteflies living on herbaceous plants and their parasitoids in tropical and sub-tropical environment through combined morphological, molecular and geostatistical approaches." Doctoral thesis, Università di Catania, 2014. http://hdl.handle.net/10761/1601.

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In tropical and sub-tropical regions, whiteflies are common pests causing severe losses on food-crops and a threat to food-security. I the sub-tropics, a critical issue is the lack of spatial information about whiteflies. Moreover, outdated information is available about the current status of their parasitoid fauna. On the contrary, in the tropics no or incomplete information is available regarding the diversity of whiteflies and their parasitoids. Methods: Morphological, molecular and geostatistical methods were used to assess the whitefly and parasitoid fauna on herbaceous plants in a sub

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Tao, Juan. "Riverine food webs and the effects of human disturbance on the contribution and quality of food sources to aquatic consumers in sub-tropical rivers." Thesis, Griffith University, 2017. http://hdl.handle.net/10072/371244.

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Understanding flows of energy and nutrients through food webs can provide important insights into mechanisms influencing the structure and function of riverine ecosystems and ecological responses to human activities. However, it is not well understood how changing land use, river impoundment and flow alteration affect the quality and quantity of food resources supporting riverine food webs. The broad aims of this thesis were to determine: (1) the effects of human disturbances on basal food sources and food quality for aquatic consumers in sub-tropical rivers in south-east Queensland (SEQ); and

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Yik, Frances Wai Hung. "Methodologies for simulating heat and moisture transfer in air-conditioned buildings in sub-tropical climates." Thesis, Northumbria University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357106.

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30

Graham, John J. (John James) 1969. "Seasonal measurements of nonmethane hydrocarbons (NMHC) in a sub-tropical evergreen forest in Southern China." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/53037.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1998.<br>Includes bibliographical references (p. 169-180).<br>by John J. Graham, Jr.<br>Ph.D.

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Salter, Michael A. "The production and preservation of fish-derived carbonates in shallow sub-tropical marine carbonate provinces." Thesis, Manchester Metropolitan University, 2013. http://e-space.mmu.ac.uk/314039/.

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Recent studies have demonstrated that marine bony fish (teleosts) precipitate inorganic calcium carbonate in their gut as a by-product of osmoregulation, subsequently excreting it into the open water column as loosely aggregated millimetre-scale pellet. These studies have primarily focused on physiological aspects of this process and the fate of resulting carbonates in pelagic settings, which is likely to be dissolution at depth. However, the implications of such carbonate production in shallow tropical and sub-tropical carbonate provinces has also begun to be considered, and it is thought tha

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Kotkowski, Rachel. "Environmental Influences on Bacterio-phytoplanktonic Coupling and Bacterial Growth Efficiency in a Sub-tropical Estuary." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1155.

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Bacterio-phytoplanktonic coupling and bacterial growth efficiency (BGE) measurements were used to analyze microbial trophic dynamics and the influence of environmental factors in Florida Bay, Florida. Phytoplankton gross primary productivity (GPP) was measured using 24-hour in situ oxygen incubations; bacterial productivity (BP) was measured using 3H- thymidine incorporation. Weak bacterio-phytoplanktonic coupling was observed over the sampling period. BP was more influenced by local total nitrogen concentrations while GPP was more evenly distributed. BGE rates were low but consistent with mar

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Mundava, Charity. "Estimating Above Ground Biomass using Remote Sensing in the Sub-Tropical Climate Zones of Australia." Thesis, Curtin University, 2015. http://hdl.handle.net/20.500.11937/1866.

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The study focused on assessing the total above ground biomass using remote sensing in the Kimberley rangelands of Western Australia. Remote sensing has the advantage that it can rapidly provide estimates non-destructively on a large scale with a high temporal frequency. In this thesis a field sampling protocol was developed and mono- and multi-temporal above ground biomass estimation models could be calibrated and validated with field based measurements for the most significant vegetation types.

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French, Michael Duncan. "Mathematical modelling of neglected tropical disease control with particular reference to schistosomiasis in sub-Saharan Africa." Thesis, Imperial College London, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.550985.

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The overarching aim of the thesis is the use of mathematical models to provide policy-relevant guidance to neglected tropical disease (NTD) control programmes, particularly those against schistosomiasis, identified following discussions with Schistosomiasis Control Initiative (SCI) staff, and utilising the SCl's extensive datasets from sub-Saharan Africa. Firstly, changes are estimated in the force of infection (Fa/) of schistosomes following annual control in Uganda, relative to baseline, expressed as the number of mature parasites acquired per host per year. It is known that praziquantel tre

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Milne, Eleanor. "Soil conservation in relation to maize productivity on sub-tropical red soils in Yunnan Province, China." Thesis, University of Wolverhampton, 2001. http://hdl.handle.net/2436/93882.

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Agricultural land in China is being degraded, with soil erosion becoming an increasing problem. In Yunnan Province, south-west China, there is a long history of soil erosion due to soil type, climate, anthropogenic influence and because 95% of the Province is mountainous. Population pressure and lack of flat land necessitate cultivation of steep slopes. The Yunnan Government prohibits cultivation of slopes >25°, however policy enforcement would result in food shortages in the Province, due to a lack of suitable land <25°. Therefore, the most appropriate way to curb soil erosion in Yunnan is to

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Philibert, Marie Catherine Raïssa. "A comparative study of nitrogen uptake and nitrification rates in sub-tropical, polar and upwelling waters." Doctoral thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/16794.

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Includes bibliographical references<br>Nitrification is the oxidation of ammonium to nitrate through a two step biological process. Nitrification in the euphotic zone has, in the past, been considered negligible even though quantifying this process correctly is important when linking carbon export to nitrate uptake by phytoplankton. However, studies of both nitrogen uptake and nitrification rates in surface waters are rare. This thesis presents such data for the Southern Ocean and St-Helena Bay, located in the Southern Benguela upwelling system. Using 15N tracers, Nitrogen uptake and regenerat

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Roberts, David Thomas. "Trophic Implications of Drought on a Sub-Tropical Reservoir Food Web: Lake Samsonvale (North Pine Dam)." Thesis, Griffith University, 2012. http://hdl.handle.net/10072/367026.

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This thesis provides new insights into the ecological functioning and trophic dynamics of a sub-tropical reservoir during a period of extreme hydrological variability. Australia is one of the driest continents on earth with the majority of its urban population relying on reservoirs for potable water supplies. Despite the importance of reservoirs in Australia, very little is known about the ecological functioning and trophic dynamics of these artificial ecosystems. This thesis investigates the trophic structure, dominant trophic interactions, key drivers of trophic dynamics and the influence of

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Chaston, Katherine A. V. "Sediment nutrient bioavailability in a sub-tropical catchment dominated by agriculture : the transition from land to sea /." [St. Lucia, Qld.], 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17118.pdf.

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Nowosielski, Kara L. "Distribution and Significance of Fecal Indicator Bacteria in Beach Sand and Seawater in a Sub-Tropical Environment." NSUWorks, 2005. http://nsuworks.nova.edu/occ_stuetd/248.

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Gastroenteritis, upper respiratory complaints and dermatological infections can all result from swimming in sewage polluted waters. Current United States Environmental Protection Agency (EPA) guidelines require that recreational beaches are routinely tested for the presence of sewage contamination. Fecal indicator bacteria, such as Escherichia coli, fecal coliforms, and enterococci, are all intestinal microflora of warm-blooded animals and are the indicators of choice. It is assumed that high concentrations of these organisms in water imply fecal contamination and hence warn of health risk to

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Abdullah, M. M. "Thermal performance and design of buildings in the sub-tropical dry climate with particular reference to Damascus." Thesis, Cardiff University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354737.

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Hill, Polly Georgiana. "Bacterioplankton dynamics in surface waters of the north-eastern (sub-)tropical Atlantic Ocean affected by Aeolian dust." Thesis, University of Southampton, 2010. https://eprints.soton.ac.uk/168937/.

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The microbial community dominates biogeochemical cycling of the ocean, affecting global climate. The impact of physical disturbance of near surface microbial populations was studied in the northeastern tropical and subtropical Atlantic Ocean. This region lies beneath easterly trade winds, resulting in strong perturbations in terms of wind driven mixing and Aeolian dust deposition. Firstly, the region’s surface water bacterioplankton community was compared with adjacent regions in terms of metabolic activity, by measuring the uptake rates of radioactively labelled amino acids (3H-leucine and 35

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Posselt, Amanda J. "Are Nutrients the Key Driver in Prompting Dominance of Toxic Cyanobacterial Blooms in a Sub-Tropical Reservoir?" Thesis, Griffith University, 2010. http://hdl.handle.net/10072/367306.

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Toxic cyanobacteria cause major problems, both for drinking and recreation, within water systems and bulk water storages, worldwide. Many investigations have been conducted to determine how, and why, they proliferate as well as why, and when, they produce toxins. A common assumption is that cyanobacteria grow in response to an increase in water column nutrient availability, but this is an oversimplification. In a sub-tropical reservoir (L. Samsonvale, South East Queensland, Australia), the toxic cyanobacterium Cylindrospermopsis raciborskii has been dominating the phytoplankton community in th

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SILVA, Mariana Brito. "Estoques de carbono e nitrogênio e disponibilidade de nutrientes em sistemas silvipastoris em região tropical sub-úmida." Universidade Federal Rural de Pernambuco, 2017. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/7325.

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Submitted by Mario BC (mario@bc.ufrpe.br) on 2018-07-04T14:59:09Z No. of bitstreams: 1 Mariana Brito Silva.pdf: 772934 bytes, checksum: a2177eedbab706fb989a9bf71d4306b2 (MD5)<br>Made available in DSpace on 2018-07-04T14:59:25Z (GMT). No. of bitstreams: 1 Mariana Brito Silva.pdf: 772934 bytes, checksum: a2177eedbab706fb989a9bf71d4306b2 (MD5) Previous issue date: 2017-08-28<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>Livestock is an activity of extensive use of large production areas without replacement of soil fertility, and may contribute to the degradation of p

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Nguyen, Dai Huong. "Influence of organic amendments on greenhouse gas emissions and N use efficiency in sub-tropical cropping systems." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/91549/4/Dai_Huong_Nguyen_Thesis.pdf.

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This thesis investigated the impact of organic sources of nutrients on greenhouse gas emissions (carbon dioxide, nitrous oxide and methane), nitrogen use efficiency and biomass production in subtropical cropping soils. The study was conducted in two main soil types in subtropical ecosystems, sandy loam soil and clay soil, with a variety of organic materials from agro-industrial residues and crop residues. It is important for recycling of agro-industrial residues and agricultural residues and the mitigation of greenhouse gas emissions and nitrogen use efficiency.

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Pétriglieri, Jasmine Rita. "Alteration of asbestiform minerals under sub-tropical climate : mineralogical monitoring and geochemistry. The example of New Caledonia." Electronic Thesis or Diss., Nouvelle Calédonie, 2017. http://portail-documentaire.unc.nc/files/public/bu/theses_unc/These_Jasmine_Petriglieri-derniere_version_these.pdf.

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Sous climat humide tropical ou subtropical, les processus d'altération supergène sont les principaux responsables de la formation et de la libération des fibres d'amiante dans l’environnement. Plus du tiers de la Nouvelle Calédonie est recouvert d’unités ultrabasiques altérées, riches en minerai de Ni. L’exploitation minière du Ni doit composer avec la présence d’affleurements d’amiante et de minéraux fibreux de type serpentine et amphibole. Dans ce contexte, les sociétés minières doivent prévenir les risques sanitaires liés à l'exposition environnementale aux fibres minérales. Actuellement, i

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Bito, Darren. "Structure and Dynamics of Herbivore Assemblages Along an Altitudinal Gradient: Indicators of Climate Change." Thesis, Griffith University, 2011. http://hdl.handle.net/10072/366400.

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Herbivory is one of the major ecosystem processes, as are pollination and seed dispersal, which drives ecological changes in both the phytophagous fauna and their host plant assemblages. The amount of herbivory damage on a host species represents not only the amount of herbivory pressure due to phytophagous insects but also the predatory pressure due to predators at higher trophic levels. Furthermore, additional interactions of climate and environmental factors determine the conditions of the host species and subsequently the assemblage of herbivorous insects that colonize them. All these dire

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Vosloo, Mathys Christiaan. "Network analysis of trophic linkages in two sub-tropical estuaries along the South-East coast of South Africa." Thesis, Nelson Mandela Metropolitan University, 2012. http://hdl.handle.net/10948/d1010966.

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Estuaries are some of the most productive yet threatened ecosystems in the world. Despite their importance they face significant threats through changes to river flow, eutrophication, rapid population growth long the caost and harvesting of natural resources. A number of international studies have been conducted investigating the structure and functioning of an array of ecosystems using ecological network analysis. Energy flow networks have been contsructed for coastal, lagoonal, intertidial and, most notably, permantently open estuaries. Despite the valualble insights contributed by these and

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Nicoloso, Rodrigo da Silveira. "Estoques e mecanismos de estabilização do carbono orgânico do solo em agroecossistemas de clima temperado e sub-tropical." Universidade Federal de Santa Maria, 2009. http://repositorio.ufsm.br/handle/1/3574.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>Soil carbon (C) sequestration in agriculture soil is a low cost option to mitigate global climatic change. No-till (NT) associated with good husbandry practices could compensate up to 15% of the anthropogenic CO2 emissions by storing the C from atmosphere as soil organic carbon (SOC). To be fully accepted as a mitigation alternative, research must be conducted to improve the accuracy of soil C sequestration estimates on field experiments as well as those made by mathematical models at regional and local scales. Complementarily, i

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Di, Corleto Ross, and mikewood@deakin edu au. "The Evaluation of heat stress indices using physiological comparisons in an alumina refinery in a sub-tropical climate." Deakin University, 1998. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20050915.124324.

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The production of alumina involves the use of a process known as the Bayer process. This method involves the digestion of raw bauxite in sodium hydroxide at temperatures around 250°C. The resultant pregnant liquor then goes through a number of filtering and precipitation processes to obtain the aluminium oxide crystals which are then calcined to obtain the final product. The plant is situated in a sub tropical climate in Northern Australia and this combined with the hot nature of the process results in a potential for heat related illnesses to develop. When assessing a work environment for hea

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Woldetsadik, Kebede. "Shallot (Allium cepa var. ascolonicum) responses to plant nutrients and soil moisture in a sub-humid tropical climate /." Alnarp : Dept. of Crop Science, Swedish Univ. of Agricultural Sciences, 2003. http://epsilon.slu.se/a367.pdf.

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