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Freshwater Ecology and ConservationApproaches and Techniques$
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Jocelyne Hughes

Print publication date: 2018

Print ISBN-13: 9780198766384

Published to Oxford Scholarship Online: February 2019

DOI: 10.1093/oso/9780198766384.001.0001

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Physical Variables in Freshwater Ecosystems

Physical Variables in Freshwater Ecosystems

(p.106) 6 Physical Variables in Freshwater Ecosystems
Freshwater Ecology and Conservation

Curt Lamberth

Jocelyne M.R. Hughes

Oxford University Press

We consider three categories of physical variables that can be measured for different freshwater ecosystems: (1) variables measured or described at the catchment or sub-catchment scale (e.g., bathymetry, depth, topography, geology); (2) those in or near to the water (e.g., temperature, turbidity, solar radiation); and (3) variables used to describe the substrate (e.g., particle size, mineral vs. peat). In this chapter we consider the practical aspects of undertaking a freshwater survey that includes measurement of physical variables; the approaches needed to undertake the survey; choosing a sampling strategy or protocol; practical tips on choice of measurement method or sensor, battery type, equipment calibration, resolution, accuracy, and links to literature providing further detail. The final section provides examples from a diversity of freshwaters where physical variables have been measured as part of an ecological survey, forming the evidence-base for management or conservation decisions.

Keywords:   bathymetry, measurement, PAR, bedload, thermometer, logger, clarity, substrate, evapotranspiration, calibration

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