# Drought experiment on aquatic vertebrate populations in McRae Creek, HJ Andrews Experimental Forest, 2022 ## Dataset - **Database Code:** AS014 - **Title:** Drought experiment on aquatic vertebrate populations in McRae Creek, HJ Andrews Experimental Forest, 2022 - **Abstract:** Three distinct reaches in McRae Creek west tributary (MCTW) within the HJ Andrews Experimental Forest in western Oregon were designated for manipulation and data collection. Manipulations included increasing the temperature (T), reducing streamflow (Q), and a reference (R reach). Population estimates of vertebrates, specifically Coastal Cutthroat Trout and Coastal Giant Salamander, were obtained using three-pass depletion methods in each reach. A Before-After-Control-Impact (BACI) design was implemented, distinguishing between the "Before" and "After" periods. "Before" surveys were conducted from July 18th to 20th, 2022, while "After" surveys occurred from September 8th to 9th, 2022. During the surveys, each species was identified, noting life stage, and relevant measurements were taken. For trout, these included the length from the snout to the tail fork (Length_Fork_Vent), the snout to the tail (Length_Tail), and weight. In the "Before" survey, all trout were tagged with elastomer tags: red for the T reach, yellow for the Q reach, and orange for the R reach. Trout larger than 80 mm also received PIT tags in their abdominal cavities. Salamanders were measured similarly, not elastomer or PIT tags were applied. During the "After" survey, no new elastomer or PIT tags were inserted; only previously tagged fish were recorded. Additionally, stream cross-sections were surveyed every 5 meters to document stream dimensions. Recorded data included the location, reach, sample date, BACI status, and distance downstream from the upstream cross-section (0 meters). Measurements at each cross-section included wetted width, bankfull width, and depths at five evenly spaced points. Furthermore, pools were identified and measured in each reach, noting the maximum pool depth, depth at the outflow, width, and length. Temperature sensors were installed in each reach, recording stream temperature every 15 minutes. Sensor locations were recorded as the distance downstream from the top of each reach. - **Keywords:** stream ecology; droughts; community composition; streams; salamanders; trout - **Temporal coverage:** 2022-07-18 to 2022-10-19 - **Principal Investigator:** Dana Richard Warren Catalina Segura ## Data Entities 1. Vertebrate numbers and size 2. Cross-section measurements 3. Pool measurements 4. Stream temperature ## Entity 1: Vertebrate numbers and size ### Attribute list - **DBCODE** — varchar, enum FSDB Database Code - **AS014** — FSDB Database Study Code - **ENTITY** — numeric(1), range 1.0000 1.0000, number Entity number - **STREAM** — varchar, enum Stream name - **MCTW** — McRae Creek west tributary - **REACH** — varchar, enum Reach sampled - **Q** — Decreased streamflow reach - **R** — Reference reach - **T** — Increased temperature reach - **SAMPLEDATE** — datetime, freetext Date sampled - **PASS** — numeric(1), range 1.0000 3.0000, number Electoshocking pass number - **BACI** — varchar, enum Sample timing to indicate whether it is the before or after survey in the BACI - **Before** — Before treatment in July - **After** — After treatment in September - **VERT_INDEX** — numeric(1), range 1.0000 58.0000, number Unique numerical index of vertebrates measured (for creating key field) - **SPECIES** — varchar, enum Vertebrate species sampled - **CT** — Oncorhyncus clarkii clarkii - **DC** — Dicamptodon tenebrosus - **LIFESTAGE** — varchar, enum Life stage of species sampled - **Adult** — Adult species - **YOY** — Year of young; assumed species was CT - **LENGTH_FORK_VENT** — numeric(1), range 24.0000 131.0000, millimeters Measurement from the tip of the snout to the fork of tail (trout) or middle of vent (salamander) - **LENGTH_TAIL** — numeric(1), range 29.0000 147.0000, millimeters Measurement from the tip of the snout to the tip of the tail - **WEIGHT** — numeric(1), range 0.2100 23.5400, grams Weight of individual organism - **ELASTOMER_COLOR** — varchar, enum Visible Implant Elastomer (VIE) Tag colors (red, yellow, or orange) - **Red** — Elastomer color that fish received was red for the T reach - **Yellow** — Elastomer color that fish received was yellow for the Q reach - **Orange** — Elastomer color that fish received was orange for the R reach - **NA** — No elastomer coloring was used on the fish - **TAG** — varchar, freetext PIT tag number installed during the "Before" survey or recaptured during the "After" survey ## Entity 2: Cross-section measurements ### Attribute list - **DBCODE** — varchar, enum FSDB Database Code - **AS014** — FSDB Database Study Code - **ENTITY** — numeric(1), range 2.0000 2.0000, number Entity number - **STREAM** — varchar, enum Stream name - **MCTW** — McRae Creek west tributary - **DATE** — datetime, freetext Date sampled - **BACI** — varchar, enum Sample timing to indicate whether it is the before or after survey in the BACI - **Before** — Before treatment in July - **After** — After treatment in September - **REACH** — varchar, enum Reach sampled - **Q** — Decreased streamflow reach - **R** — Reference reach - **T** — Increased temperature reach - **POSITION** — numeric(1), range 5.0000 50.0000, meters Distance downstream from the top of the reach - **WETTED_WIDTH** — numeric(1), range 0.5000 2.9000, meters Measurement of the stream width across the channel area that is wetted - **BANKFUL_WIDTH** — numeric(1), range 2.2000 4.2200, meters Measurement of the stream width across the channel area that is wetted during bankful flow conditions; maximum width - **DEPTH_1** — numeric(1), range 1.0000 14.0000, centimeters When looking upstream from the cross section, depth 1 represents the depth at 0 meters from the left bank - **DEPTH_2** — numeric(1), range 2.0000 35.0000, centimeters When looking upstream from the cross section, depth 2 represents the depth 25% of the channel width from the left bank - **DEPTH_3** — numeric(1), range 2.0000 17.0000, centimeters When looking upstream from the cross section, depth 3 represents the depth 50% of the channel width from the left bank - **DEPTH_4** — numeric(1), range 1.0000 25.0000, centimeters When looking upstream from the cross section, depth 4 represents the depth 75% of the channel width from the left bank - **DEPTH_5** — numeric(1), range 1.0000 16.0000, centimeters When looking upstream from the cross section, depth 5 represents the depth at the right bank ## Entity 3: Pool measurements ### Attribute list - **DBCODE** — varchar, enum FSDB Database Code - **AS014** — FSDB Database Study Code - **ENTITY** — numeric(1), range 3.0000 3.0000, number Entity number - **STREAM** — varchar, enum Stream name - **MCTW** — McRae Creek west tributary - **DATE** — datetime, freetext Date sampled - **BACI** — varchar, enum Sample timing to indicate whether it is the before or after survey in the BACI - **Before** — Before treatment in July - **After** — After treatment in September - **REACH** — varchar, enum Reach sampled - **Q** — Decreased streamflow reach - **R** — Reference reach - **T** — Increased temperature reach - **POSITION** — numeric(1), range 5.0000 42.0000, meters Distance downstream from the top of the reach - **POOL_NUM** — numeric(1), range 1.0000 7.0000, number Pool number sampled starting upstream and moving downstream - **MAX_POOL_DEPTH** — numeric(1), range 7.0000 41.0000, centimeters Maximum depth within the identified pool - **POOL_OUTFLOW** — numeric(1), range 1.0000 19.0000, centimeters Depth at the outflow (downstream) section of the pool - **POOL_LENGTH** — numeric(1), range 0.8000 3.6000, meters Length of the pool parallel to the flow of the water - **POOL_WIDTH** — numeric(1), range 0.6000 2.6000, meters Width of the pool perpendicular to the flow of the water ## Entity 4: Stream temperature ### Attribute list - **DBCODE** — varchar, enum FSDB Database Code - **AS014** — FSDB Database Study Code - **ENTITY** — numeric(1), range 4.0000 4.0000, number Entity number - **STREAM** — varchar, enum Stream name - **MCTW** — McRae Creek west tributary - **REACH** — varchar, enum Reach sampled - **Q** — Decreased streamflow reach - **R** — Reference reach - **T** — Increased temperature reach - **POSITION** — numeric(1), range 2.0000 50.0000, meters Distance downstream from the top of the reach - **DATETIME** — datetime, freetext Date and time (PST) of probe reading - **STREAM_TEMP** — numeric(1), range 6.8100 30.1400, degrees Celsius Stream temperature ## Attribute Definitions **BACI** Sample timing to indicate whether it is the before or after survey in the BACI **BANKFUL_WIDTH** Measurement of the stream width across the channel area that is wetted during bankful flow conditions; maximum width **DATE** Date sampled **DATETIME** Date and time (PST) of probe reading **DBCODE** FSDB Database Code **DEPTH_1** When looking upstream from the cross section, depth 1 represents the depth at 0 meters from the left bank **DEPTH_2** When looking upstream from the cross section, depth 2 represents the depth 25% of the channel width from the left bank **DEPTH_3** When looking upstream from the cross section, depth 3 represents the depth 50% of the channel width from the left bank **DEPTH_4** When looking upstream from the cross section, depth 4 represents the depth 75% of the channel width from the left bank **DEPTH_5** When looking upstream from the cross section, depth 5 represents the depth at the right bank **ELASTOMER_COLOR** Visible Implant Elastomer (VIE) Tag colors (red, yellow, or orange) **ENTITY** Entity number **LENGTH_FORK_VENT** Measurement from the tip of the snout to the fork of tail (trout) or middle of vent (salamander) **LENGTH_TAIL** Measurement from the tip of the snout to the tip of the tail **LIFESTAGE** Life stage of species sampled **MAX_POOL_DEPTH** Maximum depth within the identified pool **PASS** Electoshocking pass number **POOL_LENGTH** Length of the pool parallel to the flow of the water **POOL_NUM** Pool number sampled starting upstream and moving downstream **POOL_OUTFLOW** Depth at the outflow (downstream) section of the pool **POOL_WIDTH** Width of the pool perpendicular to the flow of the water **POSITION** Distance downstream from the top of the reach **REACH** Reach sampled **SAMPLEDATE** Date sampled **SPECIES** Vertebrate species sampled **STREAM** Stream name **STREAM_TEMP** Stream temperature **TAG** PIT tag number installed during the "Before" survey or recaptured during the "After" survey **VERT_INDEX** Unique numerical index of vertebrates measured (for creating key field) **WEIGHT** Weight of individual organism **WETTED_WIDTH** Measurement of the stream width across the channel area that is wetted ## Enumerated Domains ### DBCODE - **AS014** — FSDB Database Study Code ### STREAM - **MCTW** — McRae Creek west tributary ### REACH - **Q** — Decreased streamflow reach - **R** — Reference reach - **T** — Increased temperature reach ### BACI - **Before** — Before treatment in July - **After** — After treatment in September ### SPECIES - **CT** — Oncorhyncus clarkii clarkii - **DC** — Dicamptodon tenebrosus ### LIFESTAGE - **Adult** — Adult species - **YOY** — Year of young; assumed species was CT ### ELASTOMER_COLOR - **Red** — Elastomer color that fish received was red for the T reach - **Yellow** — Elastomer color that fish received was yellow for the Q reach - **Orange** — Elastomer color that fish received was orange for the R reach - **NA** — No elastomer coloring was used on the fish