coils of tubing in the sun warm the stream water
Drought Experiment 2021
Dr. Dana Warren, Dr. Catalina Segura, and graduate student Allison Swartz are exploring how drought conditions affect streams and the animals that live in streams. Under low-flow conditions, trout and salamanders aggregate in pools or cooler water, increasing competition for macroinvertebrate prey, and causing reduced growth and survival. Groundwater inputs may reduce the severity of drought effects on stream flow and temperature. In 2021 the researchers tested their ideas and techniques by conduct a pilot drying and warming experiment in a stream at the Andrews Forest. They created separate sections of stream with (a) low flow and (b) elevated temperatures (using passive heating of water traveling through black coils of tubing before returning the water to the stream). They measured groundwater contributions using longitudinally distributed temperature sensors and synoptic measurements of O18. In the study and control stream sections, they measured prey availability, fish and salamander individual growth, abundance, survival, and use of deep pools. The researchers will use the information from their pilot study to inform how they set up a larger experiment, to test drought conditions and groundwater input.
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_001
Catalina Segura checks the pump and tubing
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_002
Postdoc Keeley MacNeill, PhD student Allison Swartz, and PI Catalina Segura work on tubing for the experiment
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_003
Graduate student Allison Swartz points out air temperature and PAR (photosynthetically active radation) sensor above the streambed
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_004
tubing is used to divert and warm water
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_005
pump and tubing used in the dewatering experiment
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_006
Catalina Segura (front) and Allison Swartz (back) work on coils of tubing used to warm the streamwater
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_007
Allison Swartz and the coils of tubing for the warming experiment
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_008
Dana Warren in the streambed
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_009
A large tube is used to divert water, bypassing a section of the stream to create drought conditions
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_010
A large tube is used to divert water, bypassing a section of the stream to create drought conditions
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_011
A large tube is used to divert water, bypassing a section of the stream to create drought conditions
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_012
A large tube is used to divert water, bypassing a section of the stream to create drought conditions
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_013
A large tube is used to divert water, bypassing a section of the stream to create drought conditions
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_014
Keeley MacNeill and undergraduate student Melissa Mauk
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_015
Dana Warren in the with the large tubing used to divert water past a reach of the stream
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_016
Dana Warren inspects the outflow of the tubes that are delivering diverted water and warmed water from upstream
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_017
the outflow of the tubes that are delivering diverted water and warmed water from upstream
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_018
Large tubing was used to divert water from upstream; small tubing was used to divert and warm water from upstream
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_019
Large tubing was used to divert water from upstream; small tubing was used to divert and warm water from upstream
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_020
Large tubing was used to divert water from upstream; small tubing was used to divert and warm water from upstream
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_021
Undergraduate student Melissa Mauk works on managing the tubing for the experiment
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_022
coils of tubing in the sun warm the stream water
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_023
hoses and fittings
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_024
Catalina Segura and Allison Swartz manage the many coils and meters of tubing and hoses
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_025
Dana Warren and Melissa Mauk Check that the large tube is delivering water
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_026
A red-legged frog (Rana aurora)
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_027
A red-legged frog (Rana aurora)
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_028
A red-legged frog (Rana aurora)
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_029
A red-legged frog (Rana aurora)
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_030
Melissa Mauk, Catalina Segura, Dana Warren, Keeley MacNeill, Allison Swartz
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_031
Melissa Mauk, Keeley MacNeill, Allison Swartz, Dana Warren, Catalina Segura
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_032
Melissa Mauk, Keeley MacNeill, Allison Swartz, Dana Warren, Catalina Segura
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_033
Dana Warren takes a break from installing and inspecting tubing in the streambed
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_034
the outflow of the tubes that are delivering diverted water and warmed water from upstream
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_035
Keeley MacNeill and Allison Swartz measure temperature at the outflow of the tubes that were heating in the sun
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_036
Keeley MacNeill records water temperature
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_037
Allison Swartz measures stream temperature from coils of tubing for the warming experiment
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_038
Stream temperature and specific conductivity meter used to measure warming from coils of tubing for the warming experiment and travel time through the tubing
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_039
Allison Swartz measures stream temperature from coils of tubing for the warming experiment
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_040
Keeley MacNeill recording stream temperature data
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_041
Allison Swartz measures stream temperaturefrom coils of tubing for the warming experiment
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_042
Allison Swartz measures stream temperature from coils of tubing for the warming experiment
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_043
Field crew for the pilot test of the dewatering experiment July 2021
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_044
Keeley MacNeill and Allison Swartz measure temperature at the outflow of the tubes that were heating in the sun
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_045
Large tubing was used to divert water from upstream; small tubing was used to divert and warm water from upstream
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_046
At McRae Tributary East, Dana Warren and crew inspect a riparian area where trees were removed in 2017 to increase the amount of sunlight to the streambed
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_047
At McRae Tributary East, Dana Warren and crew inspect a riparian area where trees were removed in 2017 to increase the amount of sunlight to the streambed
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_048
Inspecting filamentous algae on the stream bed that only grows in high light conditions
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_049
Allison Swartz inspecting filamentous algae from the stream bed
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_050
A riparian canopy gap at McRae Trib East (McTE) that was implemented in 2017 to mimic old-growth canopy gaps that increase light to the streambed and promote aquatic food web resources
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_051
Dana Warren in a riparian canopy gap at McRae Trib East (McTE) that was implemented in 2017 to mimic old-growth canopy gaps that increase light to the streambed and promote aquatic food web resources
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_052
Allison Swartz inspecting filamentous algae from the stream bed
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_053
Filamentous algae in the stream
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_054
Catalina Segura in a riparian canopy gap at McRae Trib East (McTE) that was implemented in 2017 to mimic old-growth canopy gaps that increase light to the streambed and promote aquatic food web resources
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_055
High light area beneath the riparian canopy gap at McRae Trib East (McTE) that was implemented in 2017 to mimic old-growth canopy gaps that increase light to the streambed and promote aquatic food web resources
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_056
Melissa Mauk and Keeley MacNeill just upstream of the riparian canopy gap implemented in 2017 at McTE
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_057
Upstream view of a riparian canopy gap at McRae Trib East (McTE) that was implemented in 2017 to mimic old-growth canopy gaps that increase light to the streambed and promote aquatic food web resources
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_058
Stream bed at McRae Trib East (McTE)
Photographed by: Lina DiGregorio
Date: 7/8/2021
Photo number: aew_059