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The Effects of Drought Intensification on Invertebrate Populations

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The Effects of Drought Intensification on Invertebrate Populations ✕Anti-Fouling Kit Maintenance Kit Maintenance Plan Wiper Maintenance Kit WIPER Bracket Wiper Replaceable Brushes USB Communication Cable Try now (760) 727-0300[email protected]1483 Poinsettia Ave. Suite 101 Vista, California, USA 92081Monday - Thursday 7:00am to 5:30pmProductsProductsminiDOT® Logger miniDOT® Clear Logger miniPAR Logger C-FLUOR Logger Cyclops-7 Logger T-Chain WIPER microDOT® Plus By ParameterDissolved Oxygen Temperature PAR Chlorophyll Fluorescein Dye Rhodamine WT Dye Turbidity CDOM/FDOM Blue-Green Algae Refined Fuels/Crude Oil Tryptophan Pressure Optical Brighteners Phycoerythrin miniDOT® Logger miniDOT® Clear Logger miniPAR Logger C-FLUOR Logger Cyclops-7 Logger T-Chain WIPER microDOT® Plus ParametersParametersDissolved Oxygen Temperature PAR Chlorophyll Fluorescein Dye Rhodamine WT Dye Turbidity CDOM/FDOM Blue-Green Algae Refined Fuels/Crude Oil Tryptophan Pressure Optical Brighteners Phycoerythrin Dissolved Oxygen Temperature PAR Chlorophyll Rhodamine WT Dye Fluorescein Dye Turbidity CDOM/FDOM Blue-Green Algae Refined Fuels/Crude Oil Tryptophan Pressure ApplicationsApplicationsCoastal/Ocean Surface Water Source/Raw Water  Wastewater Aquaculture Wetlands Harmful Algal Blooms  Aquaculture Coastal/Ocean Harmful Algal Blooms  Source and Raw Water  Surface Water Wetlands Wastewater Accessories Anti-Fouling Kit Maintenance Kit Maintenance Plan WIPER Maintenance Kit WIPER Bracket Wiper Replaceable Brushes USB Communication Cable OEM Integrator microDOT® Plus Resources Blog Case Studies Software Media/Press Published Works Field Calibration Adjustment Find a Distributor Referral Program Careers Events FAQ Support Company Contact Request a Quote ✕ ✕Products miniDOT® Logger miniDOT® Clear Logger miniPAR Logger C-FLUOR Logger Cyclops-7 Logger T-Chain WIPER microDOT® Plus Parameters Dissolved Oxygen Temperature PAR Chlorophyll Rhodamine WT Dye Fluorescein Dye Turbidity CDOM/FDOM Blue-Green Algae Refined Fuels/Crude Oil Tryptophan Pressure Applications Aquaculture Coastal/Ocean Harmful Algal Blooms  Source and Raw Water  Surface Water Wetlands Wastewater Accessories Anti-Fouling Kit Maintenance Kit Maintenance Plan WIPER Maintenance Kit WIPER Bracket Wiper Replaceable Brushes USB Communication Cable OEM Integrator microDOT® Plus Resources Blog Case Studies Software Media/Press Published Works Field Calibration Adjustment Find a Distributor Referral Program Careers Events FAQ Support Company Contact Request a Quote Short-Term Variability in Water Quality in Indian BayouAugust 27, 2019Harnessing Marine MicroclimatesOctober 22, 2019   The Effects of Drought Intensification on Invertebrate Populations Project DetailsPRODUCT(S): miniDOT® LoggerAPPLICATION: Surface WaterPARAMETER: Dissolved OxygenLOCATION: River Itchen, Hampshire UKORGANIZATION: School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham UK; Institute of Arctic Biology, University of Alaska, Fairbanks Alaska; School of Biological and Chemical Science, Queen Mary University of London, London UK; Department of Life Sciences, Imperial College London, Ascot UKRECOGNITION:Thomas W.H. Aspin, Kris Hart, Kieran Khamis, Alexander M. Milner, Matthew J. O’Callaghan, Mark Trimmer, Zining Wang, Gavin M.D. Williams, Guy Woodward, Mark E. Ledger Case Study DescriptionDrought Intensification Alters the Composition, Body Size, and Trophic Structure of Invertebrate Assemblages in a Stream Mecrocosm Experiment 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. While the effects of flooding have been well studied, the effects of drought have received much less attention.

This study deficit has begun to be reversed. A research team composed of scientists from the School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham UK; Wessex Water, Bath UK; the Institute of Arctic Biology, University of Alaska, Fairbanks, Alaska; the School of Biological and Chemical Science, Queen Mary University of London, London UK; and the Department of Life Sciences, Imperial College London, Ascot, UK has conducted an important experiment. The first of its kind, it focused on drought intensification, specifically the possible effects on invertebrates and the food web in drought-affected waters.

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Establishing a Gradient of Drought IntensityThe team operated from an outdoor stream facility on the banks of Candover Brook, a mesotrophic chalk stream and tributary of the River Itchen (Hampshire, UK, 51°10′ 21″N, 1°18’70”W). There they created 21 large, replicate stream mecrocosms to serve as analogues of perennial, groundwater-fed headwaters. This was necessary to establish a gradient of drought intensity. In these headwater analogues, they effected progressive levels of decline in water level, loss of aquatic habitat, and increase in temperature variability, mimicking the complex syndrome of stressors which occur as a result of stream drought. The gradient incorporated extreme drying conditions, allowing the team to plan for future intensification, by exploring beyond the limits of current drought-caused disturbance regimes.

Of the 21 mecrocosms, six were given only slight loss of water depth, volume, and flow. Twelve others were fragmented into isolated pools of varying depths (three of these retained some remnant connectivity between pools). The remaining three mecrocosms were heavily dewatered.

Data CollectionThe team deployed a Surber sampler in each channel to collect benthic macroinvertebrates, which were identified to the lowest taxonomic level and counted. The team logged water temperature at 15-minute intervals in the terminal pool of each mecrocosm. Because oxygen depletion can be an important stressor in drying pools, they measured dissolved oxygen (DO) concentration every 5 min over one 24 hour period each month, using PME’s miniDOT loggers, with a miniDOT suspended in each channel.

How Drought Affects Invertebrate SpeciesThis study, conducted from 2013 through 2017, used breakpoint analysis to analyze macroinvertebrate community responses to intensifying drought and to identify the taxa and compositional metrics sensitive to small changes in drought stress. The researchers detected breakpoints for more than 60% of taxa, signaling sudden population crashes or irruptions as drought intensified. Abrupt changes were most pronounced in dewatering isolated pools where, in the remnant watered habitat, a shift occurred to larger body size across the community, predominantly driven by irruptions of predatory midge larvae and coincident population collapses among prey species (worms and smaller midges).

These results suggest that intense predation in confined, fragmented stream habitat can lead to unexpected changes in body size of invertebrates, challenging the conventional wisdom that drought favors the small. Pool fragmentation therefore might be the most critical stage of habitat loss during future droughts, the point at which impacted rivers and streams begin to exhibit major shifts in fundamental food web properties. Important, and in this case surprising, data like this will help researchers and agencies manage drought-endangered waters, as the frequency and severity of droughts increase due to climate change.

Product DescriptionPME’s miniDOT logger, as used in this experiment, is a completely submersible instrument for logging temperature and dissolved oxygen content. The oxygen sensor is an optode which measures dissolved oxygen concentration through a fluorescence method. Data are recorded to an internal SD card. The miniDOT is long-lasting, provides steady calibration, and is available with an optional anti-fouling device.

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Aquasend, Inc. helps aquafarmers worldwide more efficiently and affordably manage production by providing innovative technology that integrates water sensors, 24/7 real-time monitors and alerts. Our devices, the Aquasend Beacon® and miniDOT® Clear Logger, have proven to be valuable assets to several segments in the aquatic industry.

(760) 727-0300[email protected]1483 Poinsettia Ave. Suite 101
Vista, California, USA 92081Follow UsSign UpGet notified of product updates and new releases:

(760) 727-0300[email protected]1483 Poinsettia Ave. Suite 101
Vista, California, USA 92081Follow UsSign UpGet notified of product updates and new releases:

ProductsminiDOT® Logger miniDOT® Clear Logger miniPAR Logger C-FLUOR Logger Cyclops-7 Logger T-Chain WIPER microDOT® Plus AccessoriesAnti-Fouling Kit Maintenance Kit Maintenance Plan Wiper Maintenance Kit WIPER Bracket Wiper Replaceable Brushes USB Communication Cable ParametersDissolved Oxygen Temperature PAR Chlorophyll Fluorescein Dye Rhodamine WT Dye Turbidity CDOM/FDOM Blue-Green Algae Refined Fuels/Crude Oil Tryptophan Pressure Optical Brighteners Phycoerythrin ApplicationsCoastal/Ocean Surface Water Source/Raw Water  Wastewater Aquaculture Wetlands Harmful Algal Blooms  ResourcesCareers Company Events FAQ Find a Distributor Partners In Research Privacy Policy Repairs Software Terms and Conditions Warranty

Aquasend, Inc. helps aquafarmers worldwide more efficiently and affordably manage production by providing innovative technology that integrates water sensors, 24/7 real-time monitors and alerts. Our devices, the Aquasend Beacon® and miniDOT® Clear Logger, have proven to be valuable assets to several segments in the aquatic industry.

© 2025 PME 

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