Monitoring with data loggers enables temperature levels in the ponds to be analysed. This environmental research records heat changes which affect oxygen levels, which in turn affect the behaviour of invertebrates living in the ponds.
Freelance amateur freshwater biologist Alan Rowland monitors
ponds for interested parties. His research has included the
monitoring of a series of ponds on Lundy Island, with the results
published in the Lundy Field Society Journal of which Alan is
Alan uses Tinytag temperature data
loggers to monitor heat levels in the ponds. Freshwater
invertebrates, like all animals, are dependent on oxygen levels in
the water to breathe. As the temperature rises, oxygen is depleted
and is of course used up by the pond dwellers themselves. Wave
action or other water movement aerates the water, but in still
ponds they tend to lose much oxygen overnight. Freshwater
invertebrates migrate up and down the water column in relation to
oxygen levels and heat. Some have a wider tolerance of heat than
others which creates niche habitats.
Three temperature loggers are used, one placed on the bottom of
the pool, a second placed fully submerged just below the surface,
and the third placed on dry land by the pond edge. The units are
placed at least half an hour prior to the programmed start time for
the 24-hour run so that the sensors have time to match the ambient
temperature. The resulting data is then collected and analysed
using the Tinytag Explorer Software.
Detailed results can be seen in the pdf file which presents
typical recorded data as a graph in the Tinytag
Alan has found the Tinytags to be reliable, robust and easy to
use. He comments, "I find them to be ideal for the purpose and the
graphs produced in the Tinytag Explorer
software are an ideal format for the publication of papers. For
use in the field, they cannot be beaten!"