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Thermal Limits Determination for Zooplankton Using a Heat Block

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Diel Surface Temperature Range Scales with Lake Size.

R Iestyn Woolway^1,2,3, Ian D Jones¹, Stephen C Maberly¹

¹Lake Ecosystems Group, Centre for Ecology & Hydrology, Lancaster, United Kingdom.

|March 30, 2016

Summary

Small lakes experience significant daily temperature swings, impacting aquatic ecosystems. These diel temperature ranges are substantial in summer and increase with smaller lake size.

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Area of Science:

Environmental Science
Limnology
Climate Science

Background:

Lake ecological and biogeochemical processes are temperature-dependent.
Long-term lake surface warming is documented, but diel (daily) temperature variations are less understood due to data limitations.

Purpose of the Study:

To quantify the pattern and magnitude of diel surface water temperature variability.
To investigate the relationship between lake size and diel temperature fluctuations.

Main Methods:

Utilized high-frequency temperature data from 100 lakes.
Analyzed near-surface water temperature patterns across diel timescales.

Main Results:

Diel temperature ranges in summer can be substantial compared to long-term warming trends.
For lakes smaller than 3 km², diel temperature range increases sharply with decreasing lake area.
Most small lakes studied showed average summer diel ranges of 4–7°C.

Conclusions:

Significant diel temperature fluctuations in most lakes impact aquatic ecosystem structure and function.
The full implications of large diel temperature variations on lake biogeochemical cycles require further exploration.