Dissertations / Theses: 'Lake Management'

1

Altay, Ezgi. "The Integrated Lake Basin Management Planning:a Study On The Beysehir Lake Basin." Thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614526/index.pdf.

Full text

Abstract:

This study aims at elaborating the Integrated Lake Basin Management Planning (ILBM) approach, which is considered as a sustainable management model for lake basins, and evaluating the applicability of this approach in Turkey. ILBM considers both biophysical features and managerial requirements of lake basin systems. It pays attention to inherent dynamics between humans and nature. ILBM has been developed on the basis of Integrated Water Resources Management (IWRM), which seeks the wise use of water
i.e. using water resources with reference to the conservation principles and thresholds. The study elaborates the ILBM planning and focuses on a case study, namely the Beysehir Lake Basin. Beysehir Lake is the third largest lake and biggest freshwater lake of Turkey. Its basin is important with the distinctive natural features it accommodates in two national parks, a special bird site, a special plant site and a natural protected site. However, improper use of the Lake&rsquo
s resources has threatened its natural and ecological qualities, despite the simultaneous conservation efforts. This study, having analyzed the past planning efforts on the Basin with regard to the ILBM principles and criteria, points to the insufficiencies in institutional structure and participation. Meanwhile, the study --depending on the findings of a questionnaire conducted with the stakeholders of the Basin-- also underlines that most of the stakeholders are unaware of the changes that the Lake faced, and they do not know about the existing plans of the Basin. This proves the need for stronger interinstitutional relationships and cooperation so as to take coherent actions. This is important for the management and planning in lake basins, but particularly in the ones which lie on more than one settlement&rsquo
s administrative boundaries like the Beysehir Lake. For the efficient and effective implementation of the ILBM in Turkey&rsquo
s lake basins, the related legislation should be revised accordingly.

APA, Harvard, Vancouver, ISO, and other styles

2

Grund, Yuan Xiao. "Long-term Variation of Summer Phytoplankton Communities in an Urban Lake in Relation to Lake Management and Climate Conditions." PDXScholar, 2018. https://pdxscholar.library.pdx.edu/open_access_etds/4728.

Full text

Abstract:

Eutrophication is one of the primary factors causing harmful cyanobacteria blooms in freshwater lakes; climate change such as warmer temperature can potentially further increase both frequency and intensity of blooms. This study investigated the long-term changes in water quality and summer phytoplankton assemblages in Oswego Lake, OR, in relation to lake management practices (e.g., hypolimnetic aeration and alum treatments), as well as climatic and regional meteorological conditions. Both water quality and phytoplankton assemblages were sampled biweekly during summer seasons between 2001 and 2013. The concentrations of total phosphorus (TP), soluble reactive phosphorus (SRP) and total nitrogen (TN) decreased 66%, 93% and 31%, respectively, in response to the hypolimnetic aeration and alum treatments since 2005. The results of summer phytoplankton assemblages showed a 62% reduction of cyanobacteria biovolume and a switch from cyanobacteria dominance (2001-2005) to diatom and chlorophyte dominance (2006-2013). Cluster analysis identified four statistically different groups of summer phytoplankton assemblages (denoted Groups 1-4). Nonmetric multidimensional scaling analysis indicated that the four groups were associated with different water quality conditions. Group 1 occurred prior to hypolimnetic aeration and was primarily comprised of cyanobacteria, associated with water conditions of high nutrients and high primary production. Group 2, dominated by cyanobacteria and chlorophytes, occurred between hypolimnetic aeration and alum surface application. Group 2 was associated with turbid water conditions. Group 3 was dominated by diatoms, occurring after alum surface application. Group 4 included R-strategist phytoplankton that quickly respond to environmental changes, occurring in the years following alum injection, drawdown and inflow alum treatment. Both Group 3 and 4 were associated with reduced nutrients in the lake. The results demonstrated a strong temporal relationship between the long-term changes in water quality and summer phytoplankton assemblages and the lake management practices. The Pacific Decadal Oscillation (PDO) index, an El-Niño-like pattern of Pacific climate variability, showed a statistically significant correlation with the summer phytoplankton dynamics, while the multivariate ENSO index (MEI) and regional meteorological variables (air temperature, rainfall, wind speed, wind direction and solar radiation) were not significantly related to the changes of phytoplankton communities during the study period. In conclusion, the study results suggest that the lake management practices had strong effects on both production and community compositions of phytoplankton, and suggest the need for a future study on large-scale climate impacts on lake ecosystems and best management practice.

APA, Harvard, Vancouver, ISO, and other styles

3

Amalfi, Frederick A. "Water Resource Management in the Lake Baikal Region." Arizona-Nevada Academy of Science, 1991. http://hdl.handle.net/10150/296464.

Full text

Abstract:

From the Proceedings of the 1991 Meetings of the Arizona Section - American Water Resources Association and the Hydrology Section - Arizona-Nevada Academy of Science - April 20, 1991, Northern Arizona University, Flagstaff, Arizona
In August 1990, a team of North American and Soviet researchers travelled to several cities on the shores of Lake Baikal in southern Siberia. The purpose of the investigation was to develop a means of protecting and restoring the world's oldest and largest volume lake. Lack of water resource management strategies was identified as the key factor which may result in further deterioration of lake water quality and the diversity of biota which it supports. Deforestation, antiquated agricultural practices, inadequate solid and liquid waste disposal, and industrial contamination threaten the aesthetic quality and commercial uses of the lake. The recommendations of the joint investigative committee are summarized.

APA, Harvard, Vancouver, ISO, and other styles

4

Alrehamy, Hassan. "Extensible metadata management framework for personal data lake." Thesis, Cardiff University, 2018. http://orca.cf.ac.uk/119636/.

Full text

Abstract:

Common Internet users today are inundated with a deluge of diverse data being generated and siloed in a variety of digital services, applications, and a growing body of personal computing devices as we enter the era of the Internet of Things. Alongside potential privacy compromises, users are facing increasing difficulties in managing their data and are losing control over it. There appears to be a de facto agreement in business and scientific fields that there is critical new value and interesting insight that can be attained by users from analysing their own data, if only it can be freed from its silos and combined with other data in meaningful ways. This thesis takes the point of view that users should have an easy-to-use modern personal data management solution that enables them to centralise and efficiently manage their data by themselves, under their full control, for their best interests, with minimum time and efforts. In that direction, we describe the basic architecture of a management solution that is designed based on solid theoretical foundations and state of the art big data technologies. This solution (called Personal Data Lake - PDL) collects the data of a user from a plurality of heterogeneous personal data sources and stores it into a highly-scalable schema-less storage repository. To simplify the user-experience of PDL, we propose a novel extensible metadata management framework (MMF) that: (i) annotates heterogeneous data with rich lineage and semantic metadata, (ii) exploits the garnered metadata for automating data management workflows in PDL - with extensive focus on data integration, and (iii) facilitates the use and reuse of the stored data for various purposes by querying it on the metadata level either directly by the user or through third party personal analytics services. We first show how the proposed MMF is positioned in PDL architecture, and then describe its principal components. Specifically, we introduce a simple yet effective lineage manager for tracking the provenance of personal data in PDL. We then introduce an ontology-based data integration component called SemLinker which comprises two new algorithms; the first concerns generating graph-based representations to express the native schemas of (semi) structured personal data, and the second algorithm metamodels the extracted representations to a common extensible ontology. SemLinker outputs are utilised by MMF to generate user-tailored unified views that are optimised for querying heterogeneous personal data through low-level SPARQL or high-level SQL-like queries. Next, we introduce an unsupervised automatic keyphrase extraction algorithm called SemCluster that specialises in extracting thematically important keyphrases from unstructured data, and associating each keyphrase with ontological information drawn from an extensible WordNet-based ontology. SemCluster outputs serve as semantic metadata and are utilised by MMF to annotate unstructured contents in PDL, thus enabling various management functionalities such as relationship discovery and semantic search. Finally, we describe how MMF can be utilised to perform holistic integration of personal data and jointly querying it in native representations.

APA, Harvard, Vancouver, ISO, and other styles

5

Wagner, Allison B. "Four Eagles Lake Management Plan: A Practicum Report." Miami University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1398896623.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Corradin, Lisa M. "Recruitment and growth dynamics of lake trout in western Lake Superior /." Link to Abstract, 2004. http://epapers.uwsp.edu/abstracts/2004/Corradin.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Pérez, Losada Joaquim. "A deterministic model for lake clarity; application to management of Lake Tahoe (California-Nevada), USA." Doctoral thesis, Universitat de Girona, 2001. http://hdl.handle.net/10803/7812.

Full text

Abstract:

This dissertation has as its goal the quantitative evaluation of the application of
coupled hydrodynamic, ecological and clarity models, to address the deterministic prediction of water clarity in lakes and reservoirs. Prediction of water clarity is somewhat unique, insofar as it represents the integrated and coupled effects of a broad range of individual water quality components. These include the biological components such as phytoplankton, together with the associated cycles of nutrients
that are needed to sustain their popuiations, and abiotic components such as suspended particles that may be introduced by streams, atmospheric deposition or sediment resuspension. Changes in clarity induced by either component will feed back
on the phytoplankton dynamics, as incident light also affects biological growth. Thus ability to successfully model changes in clarity will by necessity have to achieve the correct modeling of these other water quality parameters. Water clarity is also unique in that it may be one of the earliest and most easily detected wamings of the acceleration of the process of eutrophication in a water body.

APA, Harvard, Vancouver, ISO, and other styles

8

Anderson, Richard McDonald. "Decision analysis and exploratory modeling in Lake Erie ecosystem management." Available to US Hopkins community, 2002. http://wwwlib.umi.com/dissertations/dlnow/3068110.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Schimmelpfennig, Sebastian. "Lake Tegel: hydrodynamics, pharmaceutical micro-pollutants and management strategies." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17392.

Full text

Abstract:

Ziele dieser Dissertation sind die Aufklärung der Strömungsverhältnisse und Untersuchungen zum Verhalten von Arzneimittelrückständen im Tegeler See, die Entwicklung eines Simulationsmodells für Szenarioberechnungen sowie die Ableitung neuer Bewirtschaftungskonzepte unter Zuhilfenahme der gewonnenen Erkenntnisse und Modellergebnisse. Das zweidimensionale Strömungsmodell 2D-POM kann die Mischungsverhältnisse der beiden Zuflüsse zum Tegeler See, insbesondere den Einstrom der Oberhavel, ausreichend genau abbilden. Der Oberhaveleinstrom ist sowohl windinduziert als auch vom Abfluss der Oberhavel abhängig. Der Wind wirkt je nach Windrichtung verstärkend oder abschwächend auf den Oberhaveleinstrom. Der Tegeler See weist im Vergleich zu anderen Oberflächengewässern, die als Trinkwasserressource dienen, die höchsten bisher berichteten Gehalte an Arzneimittelrückständen auf. Die räumliche Verteilung von Carbamazepin (CBZ) und Sulfamethoxazol (SMX) wird hauptsächlich durch die Verdünnung mit Oberhavelwasser bestimmt. Nur ein geringer Teil des CBZ (40%) wird im Tegeler See eliminiert. Für SMX konnte keine Elimination festgestellt werden. Im Gegensatz dazu wird Diclofenac (DCF) im Oberflächenwasser photolytisch abgebaut (50% in den Wintermonaten, mehr als 95% im Sommer). Die Konzentrationen von DCF im Tegeler See zeigen deshalb eine hohe saisonale Variabilität. Durch Simulation von sieben Bewirtschaftungsszenarien wurde untersucht, ob mithilfe der existierenden Seeleitung und Phosphateliminierungsanlage die Konzentrationen der Arzneimittelrückstände im Tegeler See verringert werden können, ohne die erfolgreiche Seerestaurierung zu gefährden. In keinem Szenario konnten die Gehalte an Arzneimittelrückständen und Phosphor gleichzeitig auf einem akzeptablen Niveau gehalten werden. Aus diesem Grund sind ergänzende Maßnahmen notwendig, z.B. eine zusätzliche Spurenstoffentfernung im Zulauf des Sees oder eine weitere Phosphorreduzierung in der Oberhavel.
This cumulative thesis aims at (i) understanding the hydrodynamic characteristics of Lake Tegel, (ii) examining the occurrence and fate of pharmaceutical micro-pollutants in the lake, (iii) developing a modeling tool for scenario prediction, and (iv) utilizing the above findings and applying the above modeling tool to create new management strategies for Lake Tegel. The free-surface two-dimensional circulation model 2D-POM serves as an adequate tool for representing the intrusion of River Havel and the mixing intensity of both inflows, as validated by measured data. The calculations indicated that the intrusion of River Havel into Lake Tegel fluctuates with river discharge and wind, both of which can amplify or neutralize the other. Compared to other surface waters also used as drinking water resources, Lake Tegel seams to feature the highest ever reported pharmaceutical concentrations worldwide. The spatial distribution of carbamazepine (CBZ) and sulfamethoxazole (SMX) in the lake was shown to be primarily affected by dilution with water from River Havel rather than by degradation within the lake. By contrast, concentrations of diclofenac (DCL) are affected by both dilution and photodegradation. DCF showed the strongest elimination of all three pharmaceuticals and revealed significant seasonality with 50% elimination in winter and more than 95% in summer. Elimination of CBZ was 40%, while SMX did not degrade at determinable rates. Seven different management scenarios were tested to answer the question of whether the existing lake pipeline could be used to reduce the amount of pharmaceuticals in Lake Tegel without deteriorating the current phosphorus level. No scenario provided a strategy optimal for both pharmaceuticals and phosphorus. Consequently, additional efforts need to be made, such as supplementary pharmaceutical treatment of the inflow originating from the wastewater treatment plant, or phosphorus reduction in the River Havel catchment.

APA, Harvard, Vancouver, ISO, and other styles

10

Edmunds, Linsey S. "Transboundary Conservation: Sustainable Resources Management and Lake Skadar/Shkoder." Ohio University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1523877674015642.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

McCulloch, Andrew John. "Developing and Calibrating the Hydrodynamic and Water Quality Model CE-QUAL-W2 for Banks Lake Washington." PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/180.

Full text

Abstract:

Located in central Washington State, Banks Lake serves as an irrigation storage reservoir for the Columbia Basin Irrigation Project and is home to a diverse fisheries population. The current hydrologic management strategies used for Banks Lake have been chosen to serve two purposes: to adequately store and provide irrigation water for the Columbia Basin Irrigation Project and to maintain a healthy aquatic environment suitable for the growth and habitation of local flora and fauna. Increased needs for irrigation water within arid central Washington poses additional challenges to reservoir managers so that irrigation needs are met without damaging the present aquatic environment within Banks Lake. Future plans by the Washington Department of Ecology to use Banks Lake storage to replenish ground water reserves of the Odessa Subarea aquifer have required an investigation into how increased seasonal drawdown may affect fish growth, fish habitat and overall limnology of Banks Lake. The goal of this project is to produce a hydrodynamic and water quality model of Banks Lake that can predict the impacts of management strategies on the lake's water quality and the linkage of lake management to fish habitat.

APA, Harvard, Vancouver, ISO, and other styles

12

Simonson, Martin Albert. "Modeling Nearshore Fish Community Responses to Shoreline Types in Lake Erie." University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1501861205611006.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Bulut, Elif. "Assessment Of Management Policies For Lake Uluabat Basin Using Avswat." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606794/index.pdf.

Full text

Abstract:

This thesis assesses phosphorus loads and management practices to control nutrient transport to Lake Uluabat. It analyzes nonpoint sources of pollution, especially agricultural pollution, throughout Uluabat Basin (watershed). AVSWAT (ArcviewTM Interface of Soil and Water Assessment Tool 2000) was used in determination of phosphorus and sediment loads to Lake Uluabat. Contribution of soluble phosphorus (SOLP) loads from agricultural sites was discussed. Seven scenarios were applied through watershed area to see effects of fertilizer and irrigation application rates, landuse changes, point source and watershed inlet loads on phosphorus loads. Calibration of the model was performed annually due to lack of data. First stream flow, next sediment and finally nutrient (SOLP) was calibrated at two gages. At the first gage, simulation results were satisfactory in terms of Nash-Sutcliffe Efficiency (ENS) and percentage deviation between observation and simulation values (Dv). ENS values for stream, sediment and SOLP were >
=0.99. Dv values for stream, sediment and SOLP were <
±
1%. At the second gage, after calibration, following values were obtained for ENS and Dv: Stream flow - ENS=0.75, Dv<
10%
sediment - ENS=0.71, Dv=25%
SOLP - ENS=0.55, Dv<
20%. It was concluded that agricultural sites were among major contributors of phosphorus load to Lake Uluabat. SOLP load to lake was about 4.0 gP/m2/year, greater than the target value of 1.0 gP/m2/year (DHKD, 2002). Scenario results showed that removing agricultural lands around Lake Uluabat and decreasing fertilizer application rates were necessary to reduce SOLP loads to lake. Moreover, phosphorus load from Emet and Orhaneli Watersheds seemed significant.

APA, Harvard, Vancouver, ISO, and other styles

14

Dickey, Anna. "Management effects on the woodland flora in the Lake District /." Leeds : University of Leeds, School of Geography, 2006. http://0-www.leeds.ac.uk.wam.leeds.ac.uk/library/secure/counter/geogbsc/200506/dickey.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Wu, Shaoming. "Multiobjective water quality management planning for the Lake Erhai Watershed." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq30573.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Hwacha, Valeriah. "Forest fire management in God's Lake, a community development perspective." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0007/MQ45061.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Basahi, Ilham A. "Management of water quality of the Marib Lake in Yemen." Thesis, University of Newcastle upon Tyne, 2003. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289214.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Braimah, Lawrence Issah. "Management of Lake Volta fisheries resources on a sustainable basis." Thesis, University of Hull, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342957.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Roffler, Luke S. "Propagation practices and genetic resources in lake sturgeon rehabilitation /." Link to full text, 2009. http://epapers.uwsp.edu/thesis/2009/Roffler.pdf.

Full text

Abstract:

Thesis (M.S.)--University of Wisconsin--Stevens Point, 2009.
Submitted in partial fulfillment of the requirements of the degree Master of Science in Natural Resources (Fisheries), College of Natural Resources. Includes bibliographical references.

APA, Harvard, Vancouver, ISO, and other styles

20

Varin, Marie-Pierre. "The Role of Iron and Anthropogenic Activities in Eutrophication: A Contemporary and Paleolimnological Study." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34618.

Full text

Abstract:

In this study, I examined water chemistry of 31 Canadian Shield lakes in relation to catchment characteristics to test the hypothesis that Shield lakes with more marble may exhibit iron (Fe) deficiency and, hence, be more vulnerable to eutrophication. I performed a diatom-based paleolimnological reconstruction of one of these lakes (Heney Lake), which was subjected to anthropogenic stresses including a fish farm. Results suggest that the presence of marble influenced lake chemistry, including lowering the ratio of Fe: P. The reconstruction of historical P concentrations was not statistically possible but past Fe could be inferred, which no previous study has attempted. Certain eutrophication-associated diatom species suggest that logging and European settlement beginning in the early XXth century led to a slight increase in nutrient concentrations. However, a more important diatom species shift was likely related to climate change, as observed in other temperate lakes worldwide.

APA, Harvard, Vancouver, ISO, and other styles

21

Belrose, Ashliegh Theresa. "The Champlain Sea/Lake Champlain Transition Recorded In The Northeast Arm Of Lake Champlain, USA-Canada." ScholarWorks @ UVM, 2015. http://scholarworks.uvm.edu/graddis/349.

Full text

Abstract:

Sediment accumulated on a lakebed archives information about past climate and changes in the regional environment. Previous studies (Burgess, 2007; Koff, 2011; Palmer, 2012) in the Northeast Arm of Lake Champlain, specifically Missisquoi Bay and Saint Albans Bay, showed a period (~9,400 - 8,600 yBP) of elevated organic matter deposition in both bays, indicating a productive event that pre-dated any possible anthropogenic influence. However, the record was abruptly cut off and any documentation representing the span of time leading up to this event was not found. The elevated organic matter levels were explained as being the result of a warm, dry environment that reduced lake level and promoted productivity within the bay. A new goal was formulated to lengthen the Holocene record for Missisquoi Bay (MSB) and Saint Albans Bay (SAB) in order to compare paleorecords and capture the span of time leading up to this highly productive event, possibly related to the Champlain Sea/Lake Champlain Transition (~10,000 yBP). One sediment core was taken from each bay as close to the original coordinates as the sediment cores obtained in previous studies (Koff, 2011; Palmer, 2012). The sediment cores were processed in the lab and sediment samples were tested for water content (WC), %C, %N, C:N, and diatom content. Each bay's sediment record consisted of a distinct marker representing lowest water level, separating a Champlain Sea unit at the bottom and an overlying Lake Champlain unit. A warming climate coupled with low lake level during this time may be the cause of the increase of productivity (%C) associated with the markers in both bays. Between ~8,600 - 9,400 yBP, a distinct marker represented evidence of a wetland in Saint Albans Bay before the onset of Lake Champlain. Diatom content in the wetland sediments indicated a generally shallow oligotrophic and alkaline body of water that shifted back and forth from brackish to freshwater. The record shows the wetland was eventually drowned as water level continued to rise, slowly transitioning into the Lake Champlain unit. Proxy results showed that internal processes within the lake continued to change in response to climatic and environmental drivers until present day conditions were reached. At ~9,400 yBP in Missisquoi Bay, there is an erosional unconformity between the Champlain Sea and Lake Champlain units, which corresponds to the low water levels also inferred from the SAB record during that time. After this unconformity, %C results show production within MSB fluctuated, similar to SAB, in response to changing climate and water levels until the present-day conditions of Lake Champlain were established. In sum, MSB and SAB each contain evidence of an ancient shoreline marker in different forms. Both markers indicate that lowest water levels occurred ~9,400 yBP and that lake level has risen ~7 - 8.5 meters since that time. The rise in lake level is associated with the transition into Lake Champlain. This Champlain Sea/Lake Champlain Transition lasted from ~9,400 yBP until ~8,600 yBP. Therefore, the oldest Lake sediment in the Northeast Arm of Lake Champlain is only 8,600 yBP.

APA, Harvard, Vancouver, ISO, and other styles

22

Raji, Aminu. "Studies on freshwater fishery of a city lake." Thesis, Cardiff University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233768.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Ness, Kirsten L. "The Effects of Shoreline Development on Lake Littoral and Riparian Habitats: Are Shoreline Protection Regulations Enough?" Fogler Library, University of Maine, 2006. http://www.library.umaine.edu/theses/pdf/NessKL2006.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Newport, Ruth A. "Arguments, argumentation and agreement a symbolic convergence study of the Lake Omapere Project : a thesis submitted to Auckland University of Technology in partial fulfillment of the requirements for the degree of Master of Arts (MA), 2007 /." Click here to access this resource online, 2007. http://hdl.handle.net/10292/163.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Kateka, Adolphine G. "Co-management challenges in the Lake Victoria fisheries a context approach /." Doctoral thesis, Stockholm : Acta Universitatis Stockholmiensis, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-35174.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

SMITH, DARREN C. "A-6E FLIGHT DATA MANAGEMENT AT CHINA LAKE NAVAL WEAPONS CENTER." International Foundation for Telemetering, 1990. http://hdl.handle.net/10150/613795.

Full text

Abstract:

International Telemetering Conference Proceedings / October 29-November 02, 1990 / Riviera Hotel and Convention Center, Las Vegas, Nevada
The Naval Weapons Center (NWC) A-6E flight test program, like so many DOD efforts, is caught in the vise of declining budgets and increasing demands and requirements. The A-6E data management system has evolved over 30 years by extensive testing and reflects all the “real world” experience obtained over that period of time. This paper will address that data management system, specifically how data is recorded on the A-6E during flight test and some associated issues as well as how that data is managed for analysis use, all within the environment of tight budgets and increased requirements.

APA, Harvard, Vancouver, ISO, and other styles

27

Levieil, Dominique P. "Territorial use-rights in fishing (TURFs) and the management of small-scale fisheries : the case of Lake Titicaca (Peru)." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/27435.

Full text

Abstract:

The purpose of this thesis is to evaluate whether the Territorial Use-Rights in Fishing (TURFs) of Lake Titieaca, Peru, are effective in overcoming the common property problem of typical fisheries and therefore whether TURFs may prove valuable as part of a more formal management system. It has recently been argued that TURFs should be incorporated into small-scale fisheries management schemes since they should be effective in controlling fishing effort, in promoting a more equitable distribution of the benefits from fishing and in reducing administrative inefficiencies. To determine whether TURFs are in fact effective in controlling fishing effort, I examine Lake Titieaca fisheries in Peru. First, I demonstrate the widespread existence of Lake Titicaca's TURFs and their control over the entire shoreline, most of the littoral area and even part of the pelagic area. Second, I document how, in spite of TURFs' illegality, Lake Titieaca shore dwellers are able to combine legal and illegal means to enforce their traditional rights over their fishing areas. Third, by showing that the relative difference between the returns to labour from fishing with those from alternative activities ranges from 50 to more than 100%, I demonstrate that local fishermen capture substantial fishing rents. If one takes into account that most fishing activities are carried out when there is little else to do, this range increases to 90-180%. I thus conclude that Lake Titieaca fisheries have not reached their bioeconomic equilibrium yet and that the predictions of the common property theory do not apply to them. And fourth, I demonstrate that the origins of these rents can be traced to fishermen's membership in TURF-holding communities, their ability to restrict physical access to the shoreline, and the obligations associated with this membership. Among these obligations are the participation in communal projects and celebrations, the fulfillment of administrative or ceremonial responsibilities, and the undertaking of agricultural activities, all of which constrain the amount of household labour available for fishing. In the concluding section, I consider the potential role of TURFs in a formal management context. I show that, in the long term, even formally recognized TURFs would not be sufficient in themselves to prevent overfishing. I therefore propose that Lake Titieaca TURFs be incorporated into a broader, decentralized management strategy which would capitalize on their strengths and promote cooperation between members of shore communities, fisheries scientists and administrators.
Applied Science, Faculty of
Community and Regional Planning (SCARP), School of
Graduate

APA, Harvard, Vancouver, ISO, and other styles

28

Sarch, Marie-Therese. "Fishing and farming at Lake Chad : a livelihood analysis." Thesis, University of East Anglia, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302146.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Wilson, Gregory B. "Ecosystem-Based Management of the Lake Erie Ecosystem: A Survey-Based Approach to Assessment of Management Needs." Kent State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=kent1302202900.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Lundström, Linnéa, and Sara Nordlund. "Exploring Co-management : A Minor Field Study on Lake Victoria Beach Management Unit in Ggaba, Kampala, Uganda." Thesis, Linköpings universitet, Tema Miljöförändring, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-128701.

Full text

Abstract:

To manage common resources such as water bodies, forests and the air is complex since several stakeholders are involved and affected by the use of the resource. One way to manage common resources is through co-management. Co-management is a decentralized method that empowers the local level and enables collaboration between the government and the local community. Co-management within fishing communities can be realized through so called Beach Management Units (BMUs). Around Lake Victoria, there are 1087 BMUs. One of these BMUs is located in Ggaba, Kampala, Uganda and the purpose of this study is to highlight benefits and shortcomings connected to co-management within fisheries. The study aims to explore if and how sustainability aspects are tackled through the co-management of fisheries. The data was collected using qualitative semi-structured interviews where six BMU members contributed with their experiences. In addition, data was collected from a qualitative content analysis on two BMU guideline documents, representing the central level. The results showed that the Ggaba BMU provides a platform for creating control through collaboration. The local levels’ perception on co-management within fisheries seems to correspond with the central level’s aim of the management. Another indication is that the BMU has brought upon positive effects on economic, social and ecological aspects on the society of Ggaba. However, corruption and illegal fishing are two identified barriers which seems to limit the function of the Ggaba BMU and the level of co-management.
Gemsamma resurser så som vattendrag, skogar och atmosfären är komplexa att hantera eftersom flera aktörer är involverade och påverkas av resursanvändningen. Ett sätt att hantera gemensamma resurser är genom samförvaltning. Samförvaltning är en decentraliserad förvaltningsmetod som möjliggör ett samarbete mellan den lokala och statliga nivån vid beslutsfattande. Omkring Victoriasjön realiseras samförvaltning genom så kallade Beach Management Units (BMUs). Dessa utgörs av 1087 stycken varav en BMU är lokaliserad i Ggaba, Kampala, Uganda. Syftet med denna studie är att belysa fördelar och brister kopplade till samförvaltning av fiske. Vidare syftar studien till att undersöka om och hur aspekter inom hållbar utveckling kan tacklas genom det decentraliserade styret av fiske. Data insamlades genom sex stycken kvalitativa, semistrukturerade intervjuer. Dessutom gjordes en kvalitativ innehållsanalys av två BMU-riktlinjedokument, vilka representerar den centrala nivån. Det empiriska materialet visade att Ggaba BMU utgör en plattform för strukturering, kontroll och samarbete. Den lokala nivåns syn på samförvaltning inom fiske verkar överensstämma med den centrala nivåns avsikt av samförvaltning. Resultatet indikerar även att BMUn har påverkat ekonomiska, sociala och ekologiska aspekter i Ggaba på ett positivt sätt. Problem med korruption och olagligt fiske identifierades dock, vilka verkar begränsa BMUns funktion och möjligheterna till samförvaltning.

APA, Harvard, Vancouver, ISO, and other styles

31

Janjua, Muhammad Yamin. "Studies on fish population structure, trophic interactions and management in lake Annecy." Chambéry, 2010. http://www.theses.fr/2010CHAMS025.

Full text

Abstract:

The thesis focuses on different aspects of management and ecology of commercially important fish species in Lake Annecy: an oligotrophic lake situated in Rhône-Alpes region of France. The main objectives of the study were to evaluate the fisheries data, growth of whitefish and Arctic char in Lake Annecy, study the trophic interactions in food web and to propose a trophic model for the lake using Ecopath with Ecosim (EwE) software using data collected mostly during the last 10 years from commercial and recreational fisheries monitoring. Fish monitoring data was found to be effective for management purpose. Growth of whitefish was found to be fluctuating during last 20 years. Food resources appeared to be partitioned among the Lake Annecy fish community during summer possibly limiting competitive interactions. The results from Lake Annecy trophic analysis including showed that fishery in Lake Annecy is sustainable at the present exploitation rate. Few conclusions were proposed for the fisheries management based on the results.

APA, Harvard, Vancouver, ISO, and other styles

32

Hur, Ran. "Quantifying panarchy of lake systems: implication for resilience and management (Case study)." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-445198.

Full text

Abstract:

Liming has been used extensively in Sweden, but the management success has been only partial, mostly mitigating the impact of acidification rather than restoring the ecological communities to a self-maintaining pre-acidified state. Rather than a sound restoration tool, liming is a form of command-and-control management that comprises a significant disturbance in the system, which manifests in the form of profound alterations of biophysical settings of lakes. This thesis aims to assess biological responses to liming with a special focus on resilience by looking at the cross-scale interaction aspects of littoral invertebrate communities in limed lakes within the framework of panarchy theory. The thesis is based on multivariate time series modeling (AEM-RDA) to extract hierarchical temporal fluctuations patterns (temporal scales) in littoral invertebrate communities. This analysis tested for the premise of panarchy theory that complex systems are hierarchically structured. Time series analyses were followed by Spearman rank correlation analysis to test another premise of panarchy theory; namely, that “information” (e.g., management interventions) flows between these hierarchical scales. Specifically, Ca:Mg ratios were used as a surrogate of liming, and correlated with each temporal pattern identified by the AEM-RDA. The result showed the distinct temporal scales in littoral invertebrate communities in limed lakes, fitting the premises of panarchy theory and agreeing with previous studies that found hierarchical temporal organizations in other lake communities. The correlation analyses indicated weak cross-scale manifestation of Ca:Mg ratios in the littoral invertebrate communities, suggesting a weak information flow of liming in managed lakes. This “dilution” of management may provide one mechanism that could explain why liming is not effective in creating a self-organizing, resilient system. The results of this study allow shedding further light on liming as a coerced regime (degraded complex systems forced into a state of desired conditions (e.g., ecosystem service provisioning) through constant management). Most research has so far focused on the evaluation of traditional metrics of biodiversity, which have shown that community structure is substantially altered in limed lakes, deviating from those in circumneutral reference lakes and degraded acidified lakes. This thesis, therefore, concludes that integration of traditional ecological approaches and complexity studies may provide complementary insight into the organization of ecosystems and sustainable resource management.

APA, Harvard, Vancouver, ISO, and other styles

33

Kumar, Rajeev. "Ecosystem based management for Mille Lacs Lake, Minnesota under changing environmental conditions." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/52269.

Full text

Abstract:

Single-species and multi-species modelling was employed to seek options for sustainable management of Mille Lacs Lake, the second largest lake within Minnesota, known primarily for its walleye (Sander vitreus) fisheries. Managers of the lake face challenges in adapting to changes that include changing temperature of the water body, changing community structure, growing number of piscivorous birds, and an invasion of zebra mussels leading to greater water clarity. The lake experienced a historical decline in the population of cisco (Coregonus artedi)—a cold-water stenothermic forage species. Surplus production models of cisco population suggested that temperature explained 36-40% of change in cisco abundance and that the decline in the species was due to a combination of temperature increase and high fishing pressure. To rebuild the depleted stock, I concluded that strong restriction was required on cisco fisheries especially in warmer years. For multi-species analysis, I built an ecosystem model with the Ecopath with Ecosim (EwE) modelling suite using extensive field data on organism parameters and diet. The EwE model was fitted to abundance and catch data for the period 1985 to 2006. Influence of temperature on the model predictions were simulated by adding temperature data as forcing function in the EwE model. The model was driven forward 25 years to evaluate the ecosystem-wide predictions for prevailing harvesting strategies and other possible fisheries scenarios of interest to the lake managers. The ecosystem model was used to estimate single-species and ecosystem-level reference points for thirteen fished species in the lake with and without including the effects of temperature change. The analysis helped comparison of ecosystem effects and temperature effects on the estimated reference points. The EwE model sucessfully forecast most of the changes seen in the lake after the period of fitted-data from 2007 to 2012. The model was extended for evaluation of ecosystem-wide impact of zebra mussels invasion. The model predicted that the mussels population would stabilise in the lake after attaining maximum density. But during this period several species, including the important walleye, could be negatively affected by the filtration of phytoplankton by zebra mussels.
Science, Faculty of
Resources, Environment and Sustainability (IRES), Institute for
Graduate

APA, Harvard, Vancouver, ISO, and other styles

34

Carr, Michelle Lee. "Conflicts between recreationists at Elk/Beaver Lake, Saanich, British Columbia, a study in attitudes and awareness to lake use and management." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ32682.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Duthie, Troy, and mikewood@deakin edu au. "Nutrients in Pirron Yallock Creek, southwestern Victoria : paleolimnological and management considerations." Deakin University. School of Ecology and Environment, 2000. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20060706.124148.

Full text

Abstract:

The concentrations of various forms of nitrogen and phosphorus in the main stream and selected tributaries of Pirron Yallock Creek, southwestern Victoria were examined over a two-year period. Exceedingly high levels of both nutrients were found within a particular tributary, while generally high nutrient levels were observed throughout the catchment. The speciation results indicated that dairy effluent was the primary source of nutrients to Pirron Yallock Creek. A palaeolimnological study was undertaken to determine the impact of European settlement upon waterway nutrient concentrations within the region. The palaeolimnological study focused primarily on the diatom flora preserved within the sediments of nearby Lakes Corangamite and Bullen Merri. Lack of preservation of diatoms within the sediments of Lake Corangamite resulted in no water quality inferences for this lake. The preserved diatoms within Lake Bullen Merri suggested an increase in trophic status of this lake during the last 500 years. While a change in the diatom flora of Lake Bullen Merri was evident, it was not possible to differentiate the impact of European settlement upon nutrient status of this waterway from long-term trophic status change. In light of the particularly high nutrient concentrations observed in Pirron Yallock Creek, improved nutrient management strategies are proposed for the catchment. These strategies, which consider current nutrient management activities, are predominantly focussed on the dairy industry, which occupies the majority of the catchment.

APA, Harvard, Vancouver, ISO, and other styles

36

Rook, Benjamin J. "Cisco recruitment dynamics in Lake Superior during 1978-2007 /." Link to full text, 2009. http://epapers.uwsp.edu/thesis/2009/Rook.pdf.

Full text

Abstract:

Thesis (M.S.)--University of Wisconsin--Stevens Point, 2009.
Submitted in partial fulfillment of the requirements of the degree Master of Science in Natural Resources (Fisheries), College of Natural Resources. Includes bibliographical references (leaves 176-190).

APA, Harvard, Vancouver, ISO, and other styles

37

Klein, Matthew T. "A demographic analysis of populations surrounding waste management facilities within Lake County, Indiana." Virtual Press, 1994. http://liblink.bsu.edu/uhtbin/catkey/897489.

Full text

Abstract:

Reported research has suggested that poor persons and/or minorities are disproportionately exposed to environmental hazards such as incinerators, landfills, pesticides, and poor air quality. One accepted form of an environmental hazard is a waste management facility. This present research examined the variables minority percentage and median household income of the population surrounding each waste management facility under scrutiny within Lake County, Indiana. The two variables were each correlated with distance from the center of each waste management facility (as determined through a geographic information system) to a distance of three kilometers. The materials and methods used in this particular research provided for a more precise analysis of such correlations than has typified most of the earlier studies. Three significant correlations were found. First, the Gary landfill rendered a positive relationship between distance from the center of the site and increased income. Second, the Munster landfill revealed a negative relationship between distance to the center of the site and increased minority percentage of the population. Lastly, the Munster landfill also had a negative relationship between income and distance from the center of the landfill. Data showed that the large proportion of minority households surrounding the Munster landfill earned an income that would easily allow for social mobility. Such social mobility, arguably, allows a household to move away from an environmental hazard. It was concluded that no support for a claim of environmental racism could be found. Further, a call for a re-examination of the definition of environmental racism is made based upon the large number of wealthy minorities residing around the Munster landfill.
Department of Natural Resources and Environmental Management

APA, Harvard, Vancouver, ISO, and other styles

38

Johnson, Patrick Lyon. "Migratory Stopover of Songbirds in the Western Lake Erie Basin." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1357314398.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Stott, Nathan Daniel Stott. "Northern Pike abundance and natal fidelity in Lake Erie marshes." Bowling Green State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1530892530309374.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Flores, Cordova Africa Ixmucane. "Hyperspectral remote sensing of water quality in Lake Atitlan, Guatemala." Thesis, The University of Alabama in Huntsville, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1549067.

Full text

Abstract:

Lake Atitlan in Guatemala is a vital source of drinking water. The deteriorating conditions of water quality in this lake threaten human and ecological health as well as the local and national economy. Given the sporadic and limited measurements available, it is impossible to determine the changing conditions of water quality. The goal of this thesis is to use Hyperion satellite images to measure water quality parameters in Lake Atitlan. For this purpose in situ measurements and satellite-derived reflectance data were analyzed to generate an algorithm that estimated Chlorophyll concentrations. This research provides for the first time a quantitative application of hyperspectral satellite remote sensing for water quality monitoring in Guatemala. This approach is readily transferable to other countries in Central America that face similar issues in the management of their water resources.

APA, Harvard, Vancouver, ISO, and other styles

41

Nicholls, David John School of Biological Science UNSW. "Eutrophication and excessive Macroalgal growth in Lake Macquarie, New South Wales." Awarded by:University of New South Wales. School of Biological Science, 1999. http://handle.unsw.edu.au/1959.4/17219.

Full text

Abstract:

In response to concern that excessive macroalgal growth and accumulation was occurring in some inshore areas of Lake Macquarie, the distribution, abundance and seasonality of macroalgae was investigated in relation to nutrient input and power station cooling water. Macroalgal dry weight biomass was measured at ten sites on a monthly basis for two years, with an analysis of community structure conducted using Multi-Dimensional Scaling. The macroalgal community in Lake Macquarie was typical of those found in other New South Wales coastal lagoons, exhibiting considerable spatial and temporal variation. A close similarity was observed in macroalgal community structure at sites affected by urban nutrient input, these being characterised by a high biomass often attributable to only one or two species. These nuisance macroalgae were mostly green algae, which were almost entirely absent from other sites. Biomass at sites affected by urban nutrient input was generally within the range documented for eutrophic estuaries elsewhere. Analysis of macroalgal community structure showed no evidence of large-scale changes macroalgal communities attributable to the effects of power station cooling water except within 500m of the outfall. At sites affected by a 1-2??C temperature increase, community structure and the magnitude of the biomass were similar to sites deemed as being relatively free of human impact. A reduction in species diversity occurred only within the immediate discharge zone, where water temperatures were approximately 6??C above ambient temperatures. Excessive growth of nuisance macroalgal species was not observed at any of the sites influenced by power station cooling water. There were no distinct patterns in seasonality of macroalgal growth in this study, though the greatest biomass appeared to occur in spring. The irregular temporal variation in macroalgal growth suggests that the most significant factors affecting growth occur on a time scale of weeks to months. It is therefore likely nutrient input to the nearshore through surface runoff is an important influence on the distribution and abundance of macroalgae in Lake Macquarie. This emphasises the need to reduce nitrogen and phosphorus input from urban sources in Lake management.

APA, Harvard, Vancouver, ISO, and other styles

42

Kelly, Dawn Priscilla. "Applying a human dimension to wildlife management, a case study of Lake O'Hara." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq24171.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Simasiku, Evans Kamwi. "Assessment of the Lake Liambezi fishery, Zambezi region, Namibia." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013036.

Full text

Abstract:

Lake Liambezi in the Zambezi Region of Namibia, formerly known as the Caprivi Region, is shallow (<6m deep) and characterised by cyclic episodes of filling and drying. When full the lake supports a highly productive fishery and when dry the lake is completely dry and used for agriculture and grazing. In 2000 the lake filled, and between May 2011 and April 2012 was surveyed using beach seine, experimental gillnets and catch landing surveys to obtain information for conservation and management recommendations for the fishery. Littoral fishes in Lake Liambezi and the Kavango floodplain were sampled using seine net and physicochemical properties were measured. Seine net surveys demonstrated that Lake Liambezi littoral zones were dominated by fishes of the family Alestidae (59.7%) while Cichlids constituted the most diverse family. Juvenile Tilapia rendalli and Oreochromis macrochir were among the five most important species in the littoral zone, indicating that these commercially important species use the littoral zone as a nursery ground. Since T. rendalli and O. macrochir are commercially important species, because of this, it is advised that seine nets should not be used. Catch efficiency between monofilament and multifilament gillnets in Lake Liambezi offshore waters were assessed. Catch efficiency experimental fishing trials showed that monofilament gillnets catch per unit effort (CPUE) was three times higher than that of multifilament gillnets for Oreochromis andersonii, O. macrochir, T. rendalli, Serranochromis macrocephalus and Clarias spp. Oreochromis andersonii comprised over 66% of the overall CPUE for both net types combined indicating the importance of this species in the gillnet fishery on the lake. A fishery has been established on the lake with more than 300 canoes and 120 fishermen using monofilament and multifilament gillnets. CPUE was 15 kg/canoe/day and was significantly (P < 0.05) associated with monthly temperature and moon phase parameters indicating that the fishery of Lake Liambezi may be altered by climate and environmental factors. Annual catch from Lake Liambezi was estimated at 3193t with an estimated productivity of 106kg/ha, suggesting that Lake Liambezi makes a significant contribution to the fish supply in the Zambezi Region. Recommendations were made to manage the Lake Liambezi fishery by imposing restrictions on effort (number of fishing boats), gear type, mesh sizes and access. Proper fisheries management and monitoring should incorporate climatic and environmental factors such as temperature and moon phase to meet the challenges of global climatic changes as well as other environmental issues.

APA, Harvard, Vancouver, ISO, and other styles

44

Trejo-Gaytan, Julieta. "Treatment of urban runoff at Lake Tahoe : low intensity chemical dosing /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2005. http://uclibs.org/PID/11984.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Simard, Lee. "Spawning Site Selection and Fry Development of Invasive Lake Trout in Yellowstone Lake, Yellowstone National Park, Wyoming." ScholarWorks @ UVM, 2017. http://scholarworks.uvm.edu/graddis/688.

Full text

Abstract:

Since their discovery in Yellowstone Lake in 1994, Lake Trout (Salvelinus namaycush) have been the object of an intensive gillnet suppression program due to their predation on native Yellowstone Cutthroat Trout (Oncorhynchus clarkii bouvieri). Managers are also interested in targeting early life stages to augment suppression. A benthic sled was used to sample for Lake Trout eggs at 24 locations, hypothesized to be spawning sites, that encompassed a range of depths, slopes, and substrate composition to determine the location and characteristics of spawning sites in Yellowstone Lake. Lake Trout eggs were collected at seven sites, five of which had not been previously confirmed as spawning sites. Habitat characterization at these sites indicate Lake Trout spawning in Yellowstone Lake is limited to areas with rocky substrate, but is not constrained to areas with interstitial spaces or contour breaks as is seen within the species' native range. Lake Trout fry were captured around Carrington Island, an additional spawning site in Yellowstone Lake, in 2014 and 2015. These fry were significantly larger at each developmental stage, consumed more food beginning at earlier stages, and were captured much later into the summer than fry captured at a spawning site in Lake Champlain. The lack of potential egg and fry predators in Yellowstone Lake could be driving these differences in spawning site selection and fry behavior. This information will allow managers to identify additional spawning locations for suppression and evaluate the impact their efforts might have on the Lake Trout population in Yellowstone Lake.

APA, Harvard, Vancouver, ISO, and other styles

46

Kanyerere, Geoffrey Zantute. "Age, growth and yield-per-recruit analysis of ndunduma Diplotaxodon limnothrissa (Teleostei: Cichlidae), in the southeastern arm of Lake Malawi." Thesis, Rhodes University, 2004. http://hdl.handle.net/10962/d1005057.

Full text

Abstract:

Diplotaxodon limnothrissa Turner (1995) is a widely distributed species occurring throughout Lake Malawi, extending from the surface to a depth of at least 220m. It is probably the most abundant cichlid in the lake with biomass estimates of around 87 000 tonnes in the pelagic zone alone. The species is exploited commercially in the southern part of the lake but since its inception the fishery has never been assessed. As such this study investigates some aspects of age and growth of the species besides applying a yield-per-recruit analysis to assess the status of the fishery. Analysis of sectioned sagittal otoliths revealed that D. limnothrissa is fast growing and relatively long-lived species, attaining ages in excess of 10 years. Growth in length was rapid in immature fish, with fish attaining almost half of their maximum size within their first year. Le ngth-at-age was described by the von Bertalanffy growth model with combined-sex growth described as Lt = 211.21(1-exp(- 0.24(t+1.36))) mm TL. Total, natural and fishing mortalities were estimated at 0.76 yr⁻¹, 0.31 yr⁻¹ and 0.45 yr⁻¹ respectively. Per-recruit analysis indicated that the D. limnothrissa stock in the southeast arm of the lake is fully exploited as indicated by the current spawner biomass-per-recruit ratios of 31-55% (SB/R)F=0. Modelling indicated that the current age-at-capture (2.67 years) is lower than the age at which yield is optimised (> 5 years) based on the F₀·₁ harvesting strategy. It is, therefore, recommended that the age-at-capture should be increased from 2.67 to 5 years to optimise yield.

APA, Harvard, Vancouver, ISO, and other styles

47

Huber, Anita. "Internal mixing in a mine lake." University of Western Australia. School of Environmental Systems Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0103.

Full text

Abstract:

[Truncated abstract] Mine lakes are a water body created after an open-cut mine ceases operating. The lakes develop in the former mine-pit due to the combination of groundwater inflow, surface run-off and, in some cases, due to rapid filling from river diversion. While potentially valuable water resources, these lakes often have poor water quality and managing the water body is an important part of the overall process of mine site rehabilitation. As mine lakes form in man-made pits, they have a bathymetry that is typically quite distinct from natural lakes and this can, in turn, strongly influence the hydrodynamics and hence the water quality of the water body. Despite the potential importance of these water bodies, there have been very few studies on the hydrodynamics of mine lakes. This study describes a field investigation of the hydrodynamics of a former coal mine lake, Lake Kepwari, in south-western Western Australia. In particular, this study examines the hydrodynamic processes in both the surface mixing layers and the internal mixing in the density stratified lake. Wind sheltering in the surface mixing layer occurs due to the presence of the steep walls and lake embankments. A week long field experiment was conducted in December 2003 using a combination of moored thermistor chains with meteorological stations and the deployment of rapid vertical profiling turbulent microstructure instruments and CTD drops from two boats operating on the lake. ... Simulations indicated that inclusion of a site specific sheltering effect, based on the results of the field campaign, significantly improved the models‘ performance in capturing the surface mixed layer deepening associated with episodic strong wind events that occur on the lake. Considerable internal mixing was indicated by the high dissipation rates observed, particularly near the boundaries. Large basin-wide diffusivities were also calculated from the heat budget method over long periods, showed a consistency with time, and were slightly higher in summer than during the Autumn Winter period. Although light, there are persistent winds over the lake and yet little basin-scale internal wave activity or seiching. It is hypothesized that any seiching motion was rapidly damped by strong mixing over the hydraulically rough bathymetry bathymetry created by the remnant benches from the open cut mining operation itself. This boundary mixing, in turn, drives secondary relaxation currents that transport mixed fluid from the boundaries to the interior, resulting in high effective basin-wide diffusivities. A simple boundary mixing model is proposed to describe this process.

APA, Harvard, Vancouver, ISO, and other styles

48

Weissman, Mark Daniel. "SPORTS SPONSORSHIP: FAN LOYALTY AND PERCEPTION OF THE LAKE COUNTY CAPTAINS MINOR LEAGUE BASEBALL TEAM." Cleveland State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=csu1417889352.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Grulkowski, Darin. "MACROINVERTEBRATE AND HABITAT ASSOCIATIONS IN A REHABILITATED ILLINOIS RIVER FLOODPLAIN: SWAN LAKE, ILLINOIS." OpenSIUC, 2010. https://opensiuc.lib.siu.edu/theses/314.

Full text

Abstract:

Anthropogenic impacts have degraded the function of many large river-floodplain ecosystems. Habitat rehabilitation/management, in the form of water level management, often emphasize the promotion of wetland vegetation. Wetland management is believed to enhance macroinvertebrate populations. To test this assumption, I evaluated macroinvertebrate response to habitat rehabilitation, habitat type, and vegetation density in Swan Lake, an Illinois River floodplain lake located in Calhoun County, Illinois. Results indicated wetland rehabilitation generally enhanced macroinvertebrate availability for spring migrating waterfowl. Results comparing habitats available at Swan Lake indicated moist soil habitats provided greater abundance and biomass of water column macroinvertebrates in the fall season, while spring was more variable. In addition, benthic macroinvertebrate communities indicated inconsistent differences between habitat types. Fall estimates indicated inundation can be an effective mechanism for controlling the timing of water column macroinvertebrate colonization. Vegetation manipulations did not consistently impact macroinvertebrate taxonomic and functional groups, but results indicated some specific taxonomic groups were influenced by vegetation presence/absence and were correlated (positively or negatively) with coarse organic matter. This research supported the principle that management of habitat and hydrologic regime can be effective tools for improving macroinvertebrate populations in order to optimize nutritional resources for waterfowl.

APA, Harvard, Vancouver, ISO, and other styles

50

Ledford, Robin. "Levee Lake| A 2012 Floristic and Natural Community Survey and Analysis." Thesis, Southern Illinois University at Edwardsville, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1561176.

Full text

Abstract:

Levee Lake is a forested wetland system located within a Mississippi River oxbow meander scar in the American Bottom of the Northern Section of the Lower Mississippi River Bottomlands Division (White 1978) that has not been developed or converted to agricultural land. Because of its relatively undisturbed status, Levee Lake is representative of a presettlement wetland. In 1976, Levee Lake was documented with a 93-acre Grade B shrub swamp/marsh/pond (SSMP) community, qualifying for the Illinois Natural Areas Inventory (INAI). Additionally, 129 acres of Grade C wet floodplain forest surrounding the SSMP community was recorded (Nyboer and Reeves 1976).

Nyboer and Reeves (1976) described Levee Lake as the largest complex of marsh, pond, and swamp communities representing presettlement American Bottom conditions. They also identified potential draining efforts at site perimeters. Based on regulatory agency and Illinois Natural History Survey (INHS) documents as well as historical aerial photographs, perimeter portions of the forested wetland system and adjoining properties were subjected to decades of clearing and draining efforts prior to and following the 1976 survey.

This study involved evaluating the current floristic composition, natural communities, and the overall quality of the Levee Lake wetland system. The information from the current evaluation was then compared to the 1976 survey to examine how recorded disturbances have affected the condition, communities, and quality of the Levee Lake wetland system. The hypothesis of this study was that documented clearing, draining, and subsequent hydrologic alterations would likely cause changes in plant composition and natural communities since the 1976 INAI survey.

To accomplish this task, the transect (Transect 1 or T1) that was used for vegetative sampling in 1976 was re-created and used as a benchmark for 2012 vegetative sampling. To compare the plant composition from 1976 to 2012, twenty 0.25 meter (m)2 sampling plots were established along Transect 1. At each plot (T1P1 through T1P20), the relative cover of each vascular plant species was recorded and the resulting species data evaluated. To provide additional plant data for the site, herbaceous, shrub, and tree sampling was conducted via the Critical Trends Assessment Program (CTAP) protocols. Vegetative sampling was conducted in late summer/fall of 2012.

To evaluate the overall plant quality of Levee Lake and the existing natural communities, existing vegetation outside of the aforementioned transects was also recorded in late summer/fall of 2012. The overall site conditions and natural communities were observed and recorded during site visits in 2011, 2012, and 2014. The current natural communities were determined by the vegetative sampling, the overall site observations, as well as available aerial photographs and images.

Based on the research and field work, the native plant composition suffered a reduction in quality. Additionally, communities suffered a reduction in quality and a shift in community type. A reduction in water levels caused severe woody encroachment of the SSMP community identified in 1976. Today, only approximately 0.58-acre [0.23 hectare (ha)] of Grade C marsh/pond community remains. In 1976, the pond community was considered an exceptional feature with the surrounding shrub swamp/marsh community considered a significant feature. Although most of the former 93-acre Grade B SSMP community suffered from severe woody encroachment, recent wetland restorations to the north and to the south appear to have aided in returning hydrology to this community. Herbaceous, shrub, and tree vegetation data collected in the CTAP plots provided further evidence of wetland and swamp conditions. The former SSMP community has evolved into a Grade C swamp/marsh/pond (SMP) community. An approximate 11.73-acre (4.75 ha) Grade D marsh/wet meadow has evolved in the southwestern region that was subjected to decades of clearing and draining disturbance (White 1978; White and Madany 1978). Further evidence of a shift in plant composition and communities between species along Transect 1 in 1976 and in 2012 was shown through the NMDS ordination and an ANOSIM test which showed that plot communities distinctly differ between the two years (Minchin 2013). (Abstract shortened by UMI.)

APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic 'Lake Management'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles