Understanding Lake Ecology
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Mechanisms Contributing to the Deep Chlorophyll Maximum in Lake Superior
Michigan Technological University Digital Commons @ Michigan Tech Dissertations, Master's Theses and Master's Dissertations, Master's Theses and Master's Reports - Open Reports 2011 Mechanisms contributing to the deep chlorophyll maximum in Lake Superior Marcel L. Dijkstra Michigan Technological University Follow this and additional works at: https://digitalcommons.mtu.edu/etds Part of the Civil and Environmental Engineering Commons Copyright 2011 Marcel L. Dijkstra Recommended Citation Dijkstra, Marcel L., "Mechanisms contributing to the deep chlorophyll maximum in Lake Superior", Master's Thesis, Michigan Technological University, 2011. https://doi.org/10.37099/mtu.dc.etds/231 Follow this and additional works at: https://digitalcommons.mtu.edu/etds Part of the Civil and Environmental Engineering Commons MECHANISMS CONTRIBUTING TO THE DEEP CHLOROPHYLL MAXIMUM IN LAKE SUPERIOR By Marcel L. Dijkstra A THESIS Submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE (Environmental Engineering) MICHIGAN TECHNOLOGICAL UNIVERSITY 2011 © 2011 Marcel L. Dijkstra This thesis, “Mechanisms Contributing to the Deep Chlorophyll Maximum in Lake Superior,” is hereby approved in partial fulfillment of the requirements for the Degree of MASTER OF SCIENCE IN ENVIRONMENTAL ENGINEERING. Department of Civil and Environmental Engineering Signatures: Thesis Advisor Dr. Martin Auer Department Chair Dr. David Hand Date Contents List of Figures ...................................................................................................... -
Glossary of Terms Used in Lake Almanor Water Quality Reports
Glossary of Terms Used in Lake Almanor Water Quality Reports Algae. Algae (the plural form of alga) are one-celled plants that do not have a central vascular system for respiration and nutrient flow. Usually algae are very small, microscopic size. However, some are much larger, such a sea lettuce, but are still algae because each cell can survive on its own and there is no central vascular system. Various estimates indicate there are over 70,000 species of algae that inhabit fresh water. “Blue green algae”. These are more correctly Cyanobacteria, and not algae. The chlorophyll in each cell is spread throughout the entire cell. This contrasts with a true algae cell which has a firmer wall, like a pea, and the chlorophyll is in sacks called chloroplasts. Most of the harmful algae bloom (HAB) problems in US lakes are caused by only about 30 species of cyanobacteria. Cyanobacteria are found in many lakes and can destroy a lake's utility by producing potent toxins (cyanotoxins), taste, and odor in the lake water. The toxins can kill or harm humans that contact the lake water. Anoxic. Anoxic water has little or no measurable dissolved oxygen. Bloom. A "bloom" usually refers to excessive algal growth. Cladocera. Relatively large members of the zooplankton, such as Daphnia (water fleas), that are primarily filter feeders that eat algae and other phytoplankton. Coldwater Fishery. Waters in which the maximum mean monthly temperature generally does not exceed a certain value and, when other ecological factors are favorable, are capable of supporting year-round populations of cold water aquatic life, such as trout. -
An Analysis of Primary and Secondary Production in Lake Kariba in a Changing Climate
AN ANALYSIS OF PRIMARY AND SECONDARY PRODUCTION IN LAKE KARIBA IN A CHANGING CLIMATE MZIME R. NDEBELE-MURISA A thesis submitted in partial fulfillment of the requirements for the degree of Doctor Philosophiae in the Department of Biodiversity and Conservation Biology, University of the Western Cape Supervisor: Prof. Charles Musil Co-Supervisor: Prof. Lincoln Raitt May 2011 An analysis of primary and secondary production in Lake Kariba in a changing climate Mzime Regina Ndebele-Murisa KEYWORDS Climate warming Limnology Primary production Phytoplankton Zooplankton Kapenta production Lake Kariba i Abstract Title: An analysis of primary and secondary production in Lake Kariba in a changing climate M.R. Ndebele-Murisa PhD, Biodiversity and Conservation Biology Department, University of the Western Cape Analysis of temperature, rainfall and evaporation records over a 44-year period spanning the years 1964 to 2008 indicates changes in the climate around Lake Kariba. Mean annual temperatures have increased by approximately 1.5oC, and pan evaporation rates by about 25%, with rainfall having declined by an average of 27.1 mm since 1964 at an average rate of 6.3 mm per decade. At the same time, lake water temperatures, evaporation rates, and water loss from the lake have increased, which have adversely affected lake water levels, nutrient and thermal dynamics. The most prominent influence of the changing climate on Lake Kariba has been a reduction in the lake water levels, averaging 9.5 m over the past two decades. These are associated with increased warming, reduced rainfall and diminished water and therefore nutrient inflow into the lake. The warmer climate has increased temperatures in the upper layers of lake water, the epilimnion, by an overall average of 1.9°C between 1965 and 2009. -
Pond and Lake Ecosystems a Pond Or Lake Ecosystem Includes Biotic
Pond and Lake Ecosystems A pond or lake ecosystem includes biotic (living) plants, animals and micro-organisms, as well as abiotic (nonliving) physical and chemical interactions. Pond and lake ecosystems are a prime example of lentic ecosystems. Lentic refers to stationary or relatively still water, from the Latin lentus, which means sluggish. A typical lake has distinct zones of biological communities linked to the physical structure of the lake. (Figure below) The littoral zone is the near shore area where sunlight penetrates all the way to the sediment and allows aquatic plants (macrophytes) to grow. Light levels of about 1% or less of surface values usually define this depth. The 1% light level also defines the euphotic zone of the lake, which is the layer from the surface down to the depth where light levels become too low for photosynthesizers. In most lakes, the sunlit euphotic zone occurs within the epilimnion. However, in unusually transparent lakes, photosynthesis may occur well below the thermocline into the perennially cold hypolimnion. For example, in western Lake Superior near Duluth, MN, summertime algal photosynthesis and growth can persist to depths of at least 25 meters, while the mixed layer, or epilimnion, only extends down to about 10 meters. Ultra-oligotrophic Lake Tahoe, CA/NV, is so transparent that algal growth historically extended to over 100 meters, though its mixed layer only extends to about 10 meters in summer. Unfortunately, inadequate management of the Lake Tahoe basin since about 1960 has led to a significant loss of transparency due to increased algal growth and increased sediment inputs from stream and shoreline erosion. -
Estimates of Hypolimnetic Oxygen Deficits in Ponds
Aquacullure and Fisheries Management 1989, 20, 167-172 Estimates of hypolimnetic oxygen deficits in ponds W. Y. B. CHANG Center for Great Lakes and Aquatic Sciences, University of Michigan, Ann Arbor, Michigan, USA Abstract. Shallow tropical integrated culture ponds in the Pearl River Delta. China, have been found to stratify almost daily, with high organic loadings and dense algal growth. The dissolved oxygen (DO) concentration is super-saturated in the epilimnion and is under 2 mg/l in the hypolimnion (>lm). The compensation depth corresponds to twice the Secchi disk depth ranging from 50 to 80cm. As a result, little or no net oxygen is produced in the hypolimnion (> 1 m). The low DO concentration in the hypolimnion causes organic materials, such as unused organic wastes and senescent algae cells, to be incompletely oxidized, since the rate of oxygen consumption by oxidable matter in water is dependent on the dissolved oxygen concentration in water. This material becomes the source of hypolimnetic oxygen deficits (HOD) which can drive whole pond DO to a dangerously low level, should sudden destratification occur. An improved estimate of hypolimnetic oxygen deficits is introduced in this article, and the advantages of this method are discussed. Introduction Oxygen is an important parameter in fish culture, and adequate levels of dissolved oxygen (DO) are essential for maintaining optimum fish growth. Inadequate dissolved oxygen and poor water quality are frequently found in ponds receiving organic wastes and can lead to many serious problems for fish culture in ponds. Problems of low dissolved oxygen are particularly prevalent in ponds during the night and early morning when there are high densities of fish and large additions of organic wastes and feeds (Schroeder 1974; Boyd 1982; Chang 1986). -
Altai Region, Russia)
Limnology and Freshwater Biology 2020 (4): 1019-1020 DOI:10.31951/2658-3518-2020-A-4-1019 SI: “The V-th Baikal Symposium on Microbiology” Short communication Salt-dependent succession of phototrophic communities in the soda lake Tanatar VI (Altai Region, Russia) Samylina O.S.1*, Namsaraev Z.B.2 1 Winogradsky Institute of Microbiology, Research Center of Biotechnology, Russian Academy of Sciences, 60 let Oktjabrja pr-t, 7-2, Moscow, 117312, Russia 2 NRC “Kurchatov Institute”, Akademika Kurchatova pl., 1, Moscow, 123182, Russia ABSTRACT. The paper describes the changes that occurred in the ecosystem of soda lake Tanatar VI during the 2011-2019 period when salinity decreased from 160-250 to 13-14 g/l Keywords: soda lake, Picocystis, cyanobacteria, biological soil crusts, succession, nitrogen fixation 1. Introduction salinity. Several types of phototrophic communities were detected in the Tanatar VI (Table): 1) Bottom, A great number and variety of saline lakes are floating and epiphytic cyanobacterial biofilms (CB); located in the Kulunda Steppe in the Altai Region. 2) floating and epiphytic Ctenocladus-communities These lakes are exposed to annual and long-standing with filamentous chlorophyte Ctenocladus circinnatus fluctuations of temperature, salinity, flooding and and cyanobacteria (CC); 3) Blooms of unicellular drying periods due to their locality in the zone of algae Picocystis salinarum (P-bloom); 4) Cyanobacterial cold arid climate. There are soda lakes among them, blooms (CB-bloom); 5) Biological soil crusts (BSC) which maintain stable alkaline pH due to a prevalence developed on the moist soil between thickets of of soluble carbonates in the brines. Thereby diversity Salicornia altaica near the lake. -
Ecosystem Services Generated by Fish Populations
AR-211 Ecological Economics 29 (1999) 253 –268 ANALYSIS Ecosystem services generated by fish populations Cecilia M. Holmlund *, Monica Hammer Natural Resources Management, Department of Systems Ecology, Stockholm University, S-106 91, Stockholm, Sweden Abstract In this paper, we review the role of fish populations in generating ecosystem services based on documented ecological functions and human demands of fish. The ongoing overexploitation of global fish resources concerns our societies, not only in terms of decreasing fish populations important for consumption and recreational activities. Rather, a number of ecosystem services generated by fish populations are also at risk, with consequences for biodiversity, ecosystem functioning, and ultimately human welfare. Examples are provided from marine and freshwater ecosystems, in various parts of the world, and include all life-stages of fish. Ecosystem services are here defined as fundamental services for maintaining ecosystem functioning and resilience, or demand-derived services based on human values. To secure the generation of ecosystem services from fish populations, management approaches need to address the fact that fish are embedded in ecosystems and that substitutions for declining populations and habitat losses, such as fish stocking and nature reserves, rarely replace losses of all services. © 1999 Elsevier Science B.V. All rights reserved. Keywords: Ecosystem services; Fish populations; Fisheries management; Biodiversity 1. Introduction 15 000 are marine and nearly 10 000 are freshwa ter (Nelson, 1994). Global capture fisheries har Fish constitute one of the major protein sources vested 101 million tonnes of fish including 27 for humans around the world. There are to date million tonnes of bycatch in 1995, and 11 million some 25 000 different known fish species of which tonnes were produced in aquaculture the same year (FAO, 1997). -
Florida Lakes and Ponds Guidebook
Florida Lakes and Ponds Guidebook Florida has thousands of lakes and ponds that provide opportunities for recreation and valuable habitat for a wide diversity of plants and animals. However, over the years, many citizens of Florida have observed a decline in the health of their lakes and ponds. By choosing to read this guide you are taking the first step towards protecting your lake or pond. This manual is a starting point for concerned citizens who wish to learn about lake ecology and ways they can protect the future of their lake or pond. Photography provided courtesy of Pinellas County Communications Department u The first two chapters will help you understand the basic concepts of watersheds and the ecology of lakes and ponds. It covers the importance of a watershed approach to lake and pond protection and the ecology and cycles within a lake system. The following chapters address the main causes of reduced water quality and outline ways that you, as a concerned citizen, can adopt a proactive role in preventing further degradation to our waterbodies. The last section provides guidance for people who wish to go one step further and begin or join a lake association, apply for a grant or obtain additional education publications. Words in italics are defined in the glossary in the back of the book. By taking action today, we can protect our lakes and ponds for tomorrow. 1 Table of Contents Introduction Chapter 1: Understanding Watersheds 1.1 Watershed Information Chapter 2: Lake Basics 2.1 The Hydrologic Cycle 2.2 Thermal Stratification -
Variability in Epilimnion Depth Estimations in Lakes Harriet L
https://doi.org/10.5194/hess-2020-222 Preprint. Discussion started: 10 June 2020 c Author(s) 2020. CC BY 4.0 License. Variability in epilimnion depth estimations in lakes Harriet L. Wilson1, Ana I. Ayala2, Ian D. Jones3, Alec Rolston4, Don Pierson2, Elvira de Eyto5, Hans- Peter Grossart6, Marie-Elodie Perga7, R. Iestyn Woolway1, Eleanor Jennings1 5 1Center for Freshwater and Environmental Studies, Dundalk Institute of Technology, Dundalk, Ireland 2Department of Ecology and Genetics, Limnology, Uppsala University, Uppsala, Sweden 3Biological and Environmental Sciences, Faculty of Natural Sciences, University of Stirling, Stirling, UK 4An Fóram Uisce, National Water Forum, Ireland 5Marine Institute, Furnace, Newport, Co. Mayo, Ireland 10 6Institute for Biochemistry and Biology, Potsdam University, Potsdam, Germany 7University of Lausanne, Faculty of Geoscience and Environment, CH 1015 Lausanne, Switzerland Correspondence to: Harriet L. Wilson ([email protected]) 15 Abstract. The “epilimnion” is the surface layer of a lake typically characterised as well-mixed and is decoupled from the “metalimnion” due to a rapid change in density. The concept of the epilimnion, and more widely, the three-layered structure of a stratified lake, is fundamental in limnology and calculating the depth of the epilimnion is essential to understanding many physical and ecological lake processes. Despite the ubiquity of the term, however, there is no objective or generic approach for defining the epilimnion and a diverse number of approaches prevail in the literature. Given the increasing 20 availability of water temperature and density profile data from lakes with a high spatio-temporal resolution, automated calculations, using such data, are particularly common, and have vast potential for use with evolving long-term, globally measured and modelled datasets. -
Metagenomic Insights Into the Uncultured Diversity and Physiology of Microbes in Four Hypersaline Soda Lake Brines
Lawrence Berkeley National Laboratory Recent Work Title Metagenomic Insights into the Uncultured Diversity and Physiology of Microbes in Four Hypersaline Soda Lake Brines. Permalink https://escholarship.org/uc/item/9xc5s0v5 Journal Frontiers in microbiology, 7(FEB) ISSN 1664-302X Authors Vavourakis, Charlotte D Ghai, Rohit Rodriguez-Valera, Francisco et al. Publication Date 2016 DOI 10.3389/fmicb.2016.00211 Peer reviewed eScholarship.org Powered by the California Digital Library University of California ORIGINAL RESEARCH published: 25 February 2016 doi: 10.3389/fmicb.2016.00211 Metagenomic Insights into the Uncultured Diversity and Physiology of Microbes in Four Hypersaline Soda Lake Brines Charlotte D. Vavourakis 1, Rohit Ghai 2, 3, Francisco Rodriguez-Valera 2, Dimitry Y. Sorokin 4, 5, Susannah G. Tringe 6, Philip Hugenholtz 7 and Gerard Muyzer 1* 1 Microbial Systems Ecology, Department of Aquatic Microbiology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, Netherlands, 2 Evolutionary Genomics Group, Departamento de Producción Vegetal y Microbiología, Universidad Miguel Hernández, San Juan de Alicante, Spain, 3 Department of Aquatic Microbial Ecology, Biology Centre of the Czech Academy of Sciences, Institute of Hydrobiology, Ceskéˇ Budejovice,ˇ Czech Republic, 4 Research Centre of Biotechnology, Winogradsky Institute of Microbiology, Russian Academy of Sciences, Moscow, Russia, 5 Department of Biotechnology, Delft University of Technology, Delft, Netherlands, 6 The Department of Energy Joint Genome Institute, Walnut Creek, CA, USA, 7 Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences and Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, Australia Soda lakes are salt lakes with a naturally alkaline pH due to evaporative concentration Edited by: of sodium carbonates in the absence of major divalent cations. -
Water Resources Report
MMINNEAPOLISINNEAPOLIS PPARKARK && RRECREATIONECREATION BBOARDOARD 20122012 WWATERATER RRESOURCESESOURCES RREPORTEPORT Environmental Stewardship Water Resources Management www.minneapolisparks.org January 2015 2012 WATER RESOURCES REPORT Prepared by: Minneapolis Park & Recreation Board Environmental Stewardship 3800 Bryant Avenue South Minneapolis, MN 55409-1029 612.230.6400 www.minneapolisparks.org January 2015 Funding provided by: Minneapolis Park & Recreation Board City of Minneapolis Public Works Copyright © 2015 by the Minneapolis Park & Recreation Board Material may be quoted with attribution. TABLE OF CONTENTS Page Abbreviations ............................................................................................................................. i Executive Summary ............................................................................................................... iv 1. Monitoring Program Overview .............................................................................................. 1-1 2. Birch Pond .............................................................................................................................. 2-1 3. Brownie Lake ......................................................................................................................... 3-1 4. Lake Calhoun ......................................................................................................................... 4-1 5. Cedar Lake ............................................................................................................................ -
Lake Ecology
Fundamentals of Limnology Oxygen, Temperature and Lake Stratification Prereqs: Students should have reviewed the importance of Oxygen and Carbon Dioxide in Aquatic Systems Students should have reviewed the video tape on the calibration and use of a YSI oxygen meter. Students should have a basic knowledge of pH and how to use a pH meter. Safety: This module includes field work in boats on Raystown Lake. On average, there is a death due to drowning on Raystown Lake every two years due to careless boating activities. You will very strongly decrease the risk of accident when you obey the following rules: 1. All participants in this field exercise will wear Coast Guard certified PFDs. (No exceptions for teachers or staff). 2. There is no "horseplay" allowed on boats. This includes throwing objects, splashing others, rocking boats, erratic operation of boats or unnecessary navigational detours. 3. Obey all boating regulations, especially, no wake zone markers 4. No swimming from boats 5. Keep all hands and sampling equipment inside of boats while the boats are moving. 6. Whenever possible, hold sampling equipment inside of the boats rather than over the water. We have no desire to donate sampling gear to the bottom of the lake. 7. The program director has final say as to what is and is not appropriate safety behavior. Failure to comply with the safety guidelines and the program director's requests will result in expulsion from the program and loss of Field Station privileges. I. Introduction to Aquatic Environments Water covers 75% of the Earth's surface. We divide that water into three types based on the salinity, the concentration of dissolved salts in the water.