Eutrophic Lakes
Eutrophic Lakes - Related Videos
12:24
Laboratory Estimation of Net Trophic Transfer Efficiencies of PCB Congeners to Lake Trout (Salvelinus namaycush) from Its Prey
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Cited by 1 •
2014
A technique for laboratory estimation of net trophic transfer efficiency of polychlorinated biphenyl (PCB) congeners to piscivorous fish from their prey is presented. To maximize applicability of the laboratory results to the field, the piscivorous fish should be fed prey fish that are typically eaten in the field.
10:49
Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
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Cited by 18 •
2014
Lake eutrophication is a water quality issue worldwide, making the need to identify and control nutrient sources critical. Laboratory determination of phosphorus release rates from sediment cores is a valuable approach for determining the role of internal phosphorus loading and guiding management decisions.
14:38
Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential
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Cited by 5 •
2012
Microbial eukaryotes are both a source of photosynthetically-derived carbon and top predatory species in permanently ice-covered Antarctic lakes. This report describes an enrichment culture approach to isolate metabolically versatile microbial eukaryotes from the Antarctic lake, Lake Bonney, and assesses inorganic carbon fixation potential using a radioisotope assay for Ribulose-1,5-bisphophate carboxylase oxygenase (RubisCO) activity.
10:55
Detection of Tilapia Lake Virus Using Conventional RT-PCR and SYBR Green RT-qPCR
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Cited by 28 •
2018
This protocol diagnoses Tilapia Lake Virus (TiLV) in tilapia tissues using RT-PCR methodologies. The entire method is described from tissue dissection to total RNA extraction, followed by cDNA synthesis and detection of TiLV by either conventional PCR or quantitative PCR using dsDNA binding a fluorescent binding dye.
05:07
Alternative Method of Removing Otoliths from Sturgeon
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Cited by 3 •
2016
The goal of the protocol is to show an effective method to extract the otoliths from sturgeon carcasses.
FAQs
Nitrogen and phosphorus act as nutrients that stimulate algal and aquatic plant production. This increased biomass changes the amount of organic material entering the ecosystem. After the organisms die, microbial decomposition processes that material and consume dissolved oxygen, linking nutrient enrichment to oxygen stress and changes in aquatic community structure.
Large amounts of algae and aquatic plants eventually die and become available for microbial decomposition. Microbes use dissolved oxygen during this process, so oxygen concentrations can decline. If oxygen becomes very low, conditions are hypoxic; if it is depleted, they are anoxic. These conditions can stress or eliminate fish and other aquatic organisms.
Eutrophication can reshape food webs by increasing biological production while creating oxygen conditions that aquatic organisms cannot tolerate. Fish and other organisms may be stressed or eliminated when oxygen declines, which can reduce biodiversity and alter interactions among species. For biologists, these changes make eutrophic lakes useful systems for examining ecosystem change.
Water-quality monitoring can focus on the conditions emphasized in eutrophic systems: nitrogen and phosphorus concentrations, biological production, water clarity, and dissolved oxygen. Examining these indicators together helps connect nutrient enrichment with algal or plant growth and oxygen depletion. The resulting information supports assessment of lake condition and decisions about protecting aquatic habitats.
Management focuses on reducing nutrient inputs because nitrogen and phosphorus stimulate the biological production that contributes to later oxygen depletion. Monitoring can help evaluate whether nutrient conditions and lake responses are improving. These strategies are intended to protect biodiversity, maintain aquatic habitats, and support restoration of ecosystems affected by nutrient enrichment.
These lakes provide biological systems for studying nutrient cycling, algal blooms, food webs, and ecosystem change in the same setting. Their responses to nutrient enrichment connect microbial decomposition, oxygen availability, aquatic organisms, and habitat condition. Research findings can also inform water-quality monitoring and restoration efforts aimed at protecting freshwater biodiversity.