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Home / Articles and Press Releases / Press Release / Submersible Tinytag Data Loggers Monitor the Meteorological Effects on Freshwater Macroinvertebrates Through Time

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Press Release

Submersible Tinytag Data Loggers Monitor the Meteorological Effects on Freshwater Macroinvertebrates Through Time

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By Tinytag - Gemini Data Loggers UK Ltd

| Read Bio

Published: September 27th, 2022

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Freelance freshwater biologist, John Davy-Bowker, uses Tinytag Aquatic 2 data loggers in a long-term river monitoring project in Dorset. With three loggers each in two chalk streams, River Frome and River Piddle, John is able to accurately collect water temperature data and compare it to external water level data and macroinvertebrate samples.

Inspired by the Environmental Change Network, with freshwater and terrestrial sites spread out all over the UK, freelance Freshwater Biologist John Davy-Bowker set up the River Lab Long Term Monitoring (RLLTM) project in Dorset. John’s project focuses on two chalk streams which flow independently and discharge into Poole Harbour: River Frome and River Piddle. Monitoring two sites close to each other makes it easier to see patterns from the data in relation to temperature to determine a common denominator (i.e., weather) in macroinvertebrate communities.

There are always at least two Tinytag Aquatic 2 (TG-4100) temperature data loggers in one location, with a third typically running as a backup, to measure the temperature of the rivers. The loggers record once every half an hour, providing year-round data from both rivers. This temperature data is evaluated alongside water level data and samples of macroinvertebrates to ultimately assess what drives the changes in stream macroinvertebrate communities through time. Water temperature is likely an important influencing factor in macroinvertebrate communities, which is why John monitors this parameter so closely.

At 14 years old, the RLLTM project is still in its early stages. The goal for the coming years is to continue to gather high-quality data for an extended period. However, some of the data has also contributed to other projects, such as Marsh et al’s ‘Warm winters and cool springs negatively influence recruitment of Atlantic salmon (Salmo salar L.) in a southern England chalk stream.’ Temperature data from the RLLTM programme was used to “calculate the mean water temperature during spawning and emergence.”

It can be difficult to sustain long-term monitoring projects using the same equipment – durability and quality are very important. At the start of this project almost 14 years ago, many freshwater biologists were still using traditional recorders with probes in the water and the device to the side of the river. This was not convenient and users often struggled to calibrate the equipment.

John instead chose Tinytag Aquatic 2 loggers because they are robust and submersible, ideal for being underwater for a long time. John adds, “The long battery life and robustness mean that I can confidently leave the loggers in place for a whole year with no concerns. I often think of them ceaselessly recoding the river temperatures while I’m snug and warm having my Christmas dinner!”

There is a convenient pillar on top of the logger to secure a shackle or seizing wire, stopping it from coming away underwater. There can be a lot of stress on underwater devices due to the varying weather and river conditions, but there is no need to worry about the Tinytag Aquatic 2 loggers being damaged, torn off, or washed away.

The RLLTM project’s loggers are periodically checked to ensure continuous recording. The convenient flashing red LED on the logger is useful to show that the loggers are still functioning correctly at just a glance, with a single flash every four seconds indicating that the logger is recording. All of the Aquatic 2 loggers involved in the programme to date have performed reliably without a single failure.

Another reason John Davy-Bowker chose Tinytag data loggers for the River Lab Long Term Monitoring Project is due to Gemini Data Loggers’ certificated calibration service, traceable to national standards. John comments, “the calibration service is fantastic. We download the data every year and then send the loggers off for calibration. We receive the loggers back with a certificate to prove the readings, fresh batteries installed, and new sealants, all ready to go again!”

Most of the rivers’ temperature readings fall between 5°C to 15°C. John praises the off-the-shelf calibration service measuring at points 0°C and 30°C, however, he typically uses our custom calibration service to receive 7 points of calibration, in 5°C increments from 0°C to 30°C, for greater confirmed accuracy. This gives him reassurance that all of his loggers are running well and providing the best possible data.

Impressed with the quality and durability of the loggers, John would “highly recommend Tinytag data loggers to any environmental scientists looking to record water temperature. They have served me very well for 14 years and I intend to continue using them for the foreseeable future.”

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ABOUT THE AUTHOR

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Tinytag - Gemini Data Loggers UK Ltd

Robust Environmental Monitoring Solutions

Tinytag data loggers – manufactured in the UK by Gemini Data Loggers – accurately monitor temperature, humidity, power usage, CO2 and other environmental parameters. All hardware, firmware and software design and production are done in-house, which enables tight control, quality and flexibility to respond to customer needs. A Quality and Environmental Management System is in operation which conforms to ISO 9001 and ISO 14001.

Rugged, reliable, and easy to use, Tinytags feature simple technology that works.

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