pme products

Case Studies

Researchers Engage miniDOT® Logger to Measure Oxygen Supersaturation for Assessing Impact on Coastal Marine Life

When a university research team based in Italy and studying coastal ecosystems was looking for a tool to measure oxygen supersaturation for assessing its impact on coastal marine life in two related studies, they turned to the miniDOT® logger to provide specific data on short temporal and small spatial-scale oxygen fluctuations.

Watching Earth and Nature Unlimited (WENU) Organization Utilizes miniDOT® Clear Loggers To Understand How El Nino Might Impact Temperature and Oxygen Levels In Kelp Forest

El Nino events have had devastating effects on kelp beds off the coast of California. This phenomenon is being studied by citizen scientists who want to know more about how and why species are dying in areas of the ocean where El Nino is occurring.

PME miniDOT® Logger Facilitates Major Findings in Small System

Despite their diminutive size, small water bodies like ponds make up the majority of our world’s still water systems. It is estimated that 95% of Earth’s still water systems measure less than 10 hectares; and of that percentage, most rarely even exceed a single hectare (2.5 acres).

PME’s Cyclops-7 Sees Oversea Sewer Systems

Tea versus coffee, biscuits or cookies; when it comes to the differences between Americans and the British, one can surely add wastewater systems to the list.

miniDOT® Logger Dives Down in Lake Anza

Unfortunately, recent decades have seen increased rates of harmful cyanobacterial algal blooms which threaten the safety of Lake Anza’s visitors and the health of its ecosystem.

miniDOTs® Monitor CA Red-Legged Frog Reintroduction

Now considered a federally threatened species, wildlife ecologist Katy Delaney and her team of biological technicians, including Sarah Wenner and Heidi Cutia, are working to promote the recovery of California red-legged frogs through reintroductions.

miniDOT® Loggers in East Africa’s Mara River

Dr. Amanda Subalusky and her colleagues have been conducting research in and around the Mara River since 2008, with recent data collection targeting the relationship between large mammal excrement (or subsidies) and fluctuations in the aquatic ecosystem’s functions.

Understanding Algal Activity in Oligotrophic Waters

In her talk “Littorally turning green: Quantifying variability in nearshore benthic metabolism in an oligotrophic mountain lake,” Dr. Lowman offered initial estimates and findings on her still ongoing study.

The Marvelous Missing miniDOT®

Lake Tegel – or Tegeler See to the local Berliners– is the second largest lake in Berlin. The sprawling lake spans roughly 4.6 square kilometers, encompassing several islands and, until recently, three missing miniDOT® Loggers.

Continuous Metabolic Monitoring with the miniDOT® Logger

Dr. Eoin O’Gorman and his team at the University of Essex have been studying the ecological impacts of climate change with a particular interest in scaling up the effects of warming on individual physiology to predict the consequences for entire ecosystems.

Zebra Mussels: Aquatic Invaders

To further scientific understanding and investigate the parameters of hospitable versus hostile conditions, Dr. Angela Strecker and a team of colleagues studied the zebra mussel population established within California’s San Justo Reservoir.

Measuring Ecosystem Metabolism After Stream Restoration

The comparative study featured here assesses freshwater stream ecosystem metabolism fourteen years after initial restoration efforts and is the first of two case studies highlighting the recent Auburn University Graduate’s research.

Coastal Development’s Impact on Tidal Creeks: An Ecosystem Metabolism Analysis

The steady march of progress looks different to all, but in his doctoral dissertation Sam Bickley, Ph.D., measured the effect that a certain type of progress is having on tidal creeks.

Finding Freedom from Fouling: Adding Wiper Technology to the T-Chain

Coupled with their choice of a mechanical antifouling tactic, PME built a T-Chain that could support Forever Ocean’s commitment to sustainable operations.

Project Oyster Case Study

Emily Hotinger saw the need to conduct a study to investigate if there were any new environments in the Perdido and Pensacola Bay systems that could support oysters to help naturally improve water quality in the bay systems.

Under Ice Phenomenon Studied with the Help of miniDOT® Loggers

Understanding under-ice conditions during winter in large lakes such as with Lake Simcoe in Ontario, Canada, has the potential to help researchers forecast dissolved oxygen (DO) levels during spring and summer of the subsequent year.

miniDOT® Loggers Help Determine if Beaver Ponds are Nitrogen Sinks

Researchers in Utah set out to determine if beaver ponds, formed when beavers build dams in headwaters, are effective at trapping, processing, and cycling NPS pollutants.

Can Kelp Forests be Used to Reduce Ocean Acidification?

Kelp forests could help mitigate some of the effects of ocean acidification. During photosynthesis, the kelp absorbs excess carbon dioxide (CO2) from the surrounding waters and converts it into dissolved oxygen.

miniDOT® and miniPAR Loggers Used to Measure Arctic Lake Metabolisms

Vendy Hazukova, a PhD student at the University of Maine, has been conducting research on how lake metabolisms change from being ice-covered to after the ice melts during the summer.

Stream-Aquifer Interactions with Coastal California Watershed

The goal of the study was to assess the impact of groundwater pumping for irrigation on stream flows. The researchers used a variety of tools and methods for this study, including PME’s Cyclops-7 Logger.

miniDOT Loggers Solve the Case of the Disappearing Jellyfish

The goal of the study was to track changes in temperature and dissolved oxygen (DO) levels over time, giving the researchers a sense of the water column structure in the lake.

Studying the Effects of Climate Change on Marine Life

The Acidification Nearshore Monitoring Network (ANeMoNe) has been studying the effects of oceanic warming and acidification on marine life across various sites in Washington State.

Recording Dissolved Oxygen Levels at Spawning Site of Invasive Trout Species

A project, funded in part by the U.S. National Parks Service, was launched with the goal of killing Lake Trout embryos and restoring the natural ecosystem in Yellowstone Lake.

miniDOT Logger Compares Nutrient Utilization and Cycles of Lakes

Joe Vanderwall, a graduate student at the University of Montana, aimed to measure the difference in nutrient utilization and cycles in high elevation lakes and medium elevation lakes.

Water Column Investigation at Kauai Sea Farm

Though fresh sea water moves in and out of their pond throughout the day, the pond was stratified based on temperature. Knowing that this can affect dissolved oxygen (DO) saturation which impacts the health of the aquatic life, they deployed a miniDOT logger to investigate further.

Studying the Environmental Parameters and Fauna of Underwater Caves

The aim of the project is to determine how stable the environmental parameters are and to link those parameters to the distribution of cave fauna.

Oxygen Supersaturation Protects Coastal Fauna from Ocean Warming

With global climate change causing a general warming of the world’s ocean waters, scientists, conservationists, and fisheries managers are alarmed by the prospect of long-term damage to the stocks of many aquatic species.

Harnessing Marine Microclimates

Due to climate change, the oceans are warming, deoxygenating, and acidifying at an unprecedented rate. These climate change-driven stressors have caused a decline in the populations of many marine species.

The Effects of Drought Intensification on Invertebrate Populations

As a result of climate change, many regions are expected to experience more intense and prolonged droughts over the next 100 years. The effect of this drought intensification on the health of running waters is thus a source of great interest.

Short-Term Variability in Water Quality in Indian Bayou

The research team deployed sensors off a dock in Indian Bayou. PME’s miniDOT loggers were used to measure dissolved oxygen content, along with PME’s minPAR logger, which measured diffused sunlight (also known as Photosynthetically Active Radiation or PAR).

The Tale of Two Wipers

The miniWIPER is a self-contained, completely submersible, wiping device that can be used with a variety of sensors. It can be programmed to wipe at various intervals and is powered from two AA Energizer L92 lithium batteries.

Monitoring Shallow Water Habitat in the SW Baltic Sea

Coastal environments naturally exhibit high degrees of variability. Drastic changes in water parameters like temperature, dissolved oxygen level, and pH can occur within hours or even minutes, due to the proximity of land, the shallowness of the water, and the direct influence of river discharges.

The White Abalone Restoration Consortium

Researchers from the University of California, Davis (UCD), the National Oceanographic and Atmospheric Administration, the California Department of Fish and Wildlife, and other local and international programs have joined together in the White Abalone Restoration Consortium (WARC), working toward the goal of restoring federally endangered White Abalone populations.

Measuring Diffused Sunlight in Lakes

Rachel Pilla of Miami University is deploying PME’s miniPAR loggers to measure photosynthetically active radiation (PAR) in a lake located in the Pocono region of Pennsylvania. Her lab has been studying the lake for over 30 years.

Measuring Dissolved Oxygen Levels in Seawater

Temperature and pH measurements can yield important information about how the physical environment of the ocean responds to warming and increasing levels of carbon dioxide in the atmosphere as well as global weather patterns

Comparing the miniDOT Logger to the Seabird

The miniDOT® logger is a completely submersible instrument that logs dissolved oxygen and temperature measurements. The oxygen sensor is an optode that senses dissolved oxygen concentration in water through a fluorescence method.

Cyclops-7 Logger Traces Fluorescein in Nepal

The Cyclops-7 Logger is a completely self-contained waterproof device designed to connect to one Turner Designs Cyclops-7 sensor at a time. PME currently offers two variations of this sensor, fixed and interchangeable.

Creating Models to Better Understand Lagoons

For the last several years researchers from Scripps Institution of Oceanography have been running a shore-based seawater CO2 and pH monitoring system in the Agua Hedionda Lagoon in Carlsbad, California next to the Carlsbad Aquafarm.

miniDOT Used to Understand Metabolism of Steppe Rivers

The Steppe Rivers, American West and Mongolia, vary greatly. The differences between these rivers are caused by differential land use, climate, and potential future development.

Calibrating miniDOT with the Ice-bucket Test

A PME customer, Joseph Verfaillie, reported that a conical barnacle had grown onto the sensor of his miniDOT logger. His miniDOT, calibrated in August 2014, had been in near-continuous use in the field for the last three years.

MiniDOTs Weather Superstorm Sandy Flooding

Flooding events influence urban streams such as those found in Baltimore, Maryland. When these flooding events occur, these streams’ ability to produce energy (Gross Primary Production, GPP) and their demand for energy (Ecosystem Respiration, ER) change.

Understanding Wildlife Inputs in the Mara River

The Mara River flows nearly 400 kilometers from the Kenya highlands to Lake Victoria, crossing through the Maasai Mara National Reserve in Kenya and the Serengeti National Park in Tanzania.

Tracking Benthic Production with miniDOT

To measure dissolved oxygen being produced by benthic organisms, miniDOT loggers were placed at varying depths. A study of lakes in the northern U.S. used a multitude of miniDOT loggers to study how particles in the lake water column inhibited photosynthesis.

Hyporheic research with buried miniDOT Loggers

The hyporheic zone is the area below the riverbed, where groundwater and surface water mix, and is a vital part of fluvial habitat.

OceanCube Seafloor

The OceanCubes are marine observatories located in areas where upwelling of cold, nutrient rich and hypoxic water is expected on a seasonal basis. PME’s T-Chain allows for high resolution observation of temperature and PAR within the OceanCube Observatories.

Conducting Whole-lake Mixing Experiments

Researchers are hoping to gain insight into the effects of large scale climatological changes. Rainbow Smelt invaded Crystal Lake in the early 1980’s causing a sharp decline in the native yellow perch population.

Estimating Free Water Metabolism

The miniDOT logger is a small, portable, completely submersible logging device able to record dissolved oxygen and temperature measurements.

Dye Tracing Study

The Fluorescein dye was injected into the bottom of a well and was later detected by the logger 18 hours after the injection began. It was discovered that the Fluorescein dye traveled over a linear distance of roughly 2,150 feet with a maximum velocity of 119 feet/ hour.

Monitoring Oxygen under Ice

The miniDOT logger is a small, portable, completely submersible logging device able to record dissolved oxygen and temperature measurements.

Understanding Nutrient Dispersion in the Arabian Gulf

Weather events, such as Shamals (a northwesterly wind that blows over Iraq and the Persian Gulf) can drive mixing processes that affect fragile ecosystems. A better understanding of these events will be invaluable to policy makers for managing natural resources in the area