determining lamprey species composition, larval distribution and adult abundance in the deschutes...
Post on 27-Mar-2015
214 Views
Preview:
TRANSCRIPT
Determining lamprey species composition, larval distribution
and adult abundance in the Deschutes River sub-basin
Jennifer Graham & Chris BrunConfederated Tribes of Warm Springs Reservation, Oregon
Department of Natural Resources
ProjectArea
Oregon
Oregon
Confederated Tribes of Warm
Springs Reservation
Confederated Tribes of Warm Springs Reservation, Oregon
Department of Natural Resources
ObjectivesObjective 1: Determine larval distribution and associated habitat
Objective 3: Estimate the number of lamprey outmigrants by developmental stageObjective 4: Estimate the escapement
of adult lamprey, determine harvest and harvest rates at Sherar’s Falls.
Objective 2: Determining species composition of Lampetra
Larval Distribution and Associated Habitat
~ May - August
Confederated Tribes of Warm Springs Reservation, Oregon
Department of Natural Resources
Objective 1
Methods
~ Three-tiered sampling methodology
~ Randomly selected 1 sample site per 10 Rkm
Confederated Tribes of Warm Springs
Reservation, OregonDepartment of Natural Resources
Objective 1
Methods – Habitat & Water QualityTier 2 – Transect
Wetted Channel WidthBankfull Channel
WidthCanopy Density
Tier 1 – ReachConductivity
Dissolved OxygenWater Temperature
Channel Slope
60-m
Tier 3 – Sub-sample
Mean Water DepthWater Velocity
Substrate CompositionHabitat Type1m x 1m
Confederated Tribes of Warm Springs
Reservation, OregonDepartment of Natural Resources
Objective 1
Methods – Lamprey sampling
~ Backpack electrofisher (AbP-2)
~ 2, 90-s samples
~ Lamprey~ Anesthetized,
identified, weighed and measured
~ Returned to collection area
Tier 3 – Sub-sample
~ 132 sub-sampled
~ 29.5% contained ammocoetes
Results - Streams
~4 of 13 streams sampled contained ammocoetes
~ Present in lowest reaches
~ 131 ammocoetes collected
~ Total length range: 25 mm – 145 mm~ Mean total Length: 77 mm
Results – Lamprey
Confederated Tribes of Warm Springs Reservation, Oregon
Department of Natural Resources
Objective 1
However, sample sizes were small!!
Regression P-Value
Lamprey presence vs. Woody debris 0.000
Lamprey presence vs. Depositional Area 0.011
2004 Summary
~ Continue larval distribution and habitat data collection
~ Remainder of perennial streams in the lower Deschutes ~ Mainstem Deschutes
~ Conducted sampling in three tributaries
~ Determined distribution
Species Composition
Confederated Tribes of Warm Springs
Reservation, OregonDepartment of Natural Resources
Objective 2
Methods & Results~ Field identification problematic
~ Collect samples for permanent collection~ Electrofishing~ Rotary screw trap
~ Collect specimen in three different phases of development~ Only observed species in two phases
Confederated Tribes of Warm Springs
Reservation, OregonDepartment of Natural Resources
Objective 2
2004 Summary
~ Continue collecting samples
~ Send problematic samples to USGS
Estimate outmigrants and outmigration timing
Confederated Tribes of Warm Springs
Reservation, OregonDepartment of Natural Resources
Objective 3
Methods
~ Fished 2 screw traps~ 5 days/wk; 24 hrs/day
~ Collected lamprey~ Anesthetized~ Identified to species~ Developmental stage~ Length
2002-2003 Screw Trap Summary
Confederated Tribes of Warm Springs Reservation, Oregon
Department of Natural Resources
Objective 3
Days Operated 118 112Days with lampreys present 81 84
Ammocoetes Collected 262 336Ammocoete Length Range (mm) 49-134 44-126Ammocoetes Mean Length (mm) 83.6 100.1
Macropthalmia Collected 68 1Macrophtalmia Length Range (mm) 90-159 --Macropthalmia Mean Length (mm) 127.8 120
Warm SpringsRiver
ShitikeCreek
Results – Warm Springs Timing
Confederated Tribes of Warm Springs Reservation, Oregon
Department of Natural Resources
Objective 3
Month
Jan
Feb
Mar
Apr
May
June
July
Aug
Sept Oct
Nov Dec
CPU
E (L
ampr
ey/D
ay)
0
2
4
6
8
10
12 2002 Ammocoetes2003 Ammocoetes
Results – Warm Springs Timing
Confederated Tribes of Warm Springs Reservation, Oregon
Department of Natural Resources
Objective 3
Month
Jan
Feb
Mar
Apr
May
June
July
Aug
Sept Oct
Nov Dec
CPU
E (L
ampr
ey/D
ay)
0.0
0.5
1.0
1.5
2.0
2.5
3.02002 Macropthalmia2003 Macropthalmia
Results – Shitike Creek Timing
Confederated Tribes of Warm Springs Reservation, Oregon
Department of Natural Resources
Objective 3
Months
Jan
Feb
Mar
Apr
May
June
July
Aug
Sept Oct
Nov Dec
CPU
E (l
ampr
ey/d
ay)
02468
10121416
2002 Ammocoetes & Macrpthalmia2003 Ammocotes & Macropthalmia
Confederated Tribes of Warm Springs
Reservation, OregonDepartment of Natural Resources
Objective 3
Trap efficiencies
~ Multiple trap holding efficiencies~ 0% holding efficiency
~ No out-migrant estimates completed
~ Ammocoetes captured through electrofishing~ Marked with elastomer~ Placed in holding box
~ Checked after 24 hours
2004 Summary
~ Modify existing traps
~ Continue collecting timing data
~ Mark-recapture to estimate out-migrant numbers
~ Conduct trap efficiencies
Escapement Estimate and Tribal Harvest
Picture courtesy of Lyman Jim
Sherar’sFalls
Methods – Escapement
Confederated Tribes of Warm Springs Reservation, Oregon
Department of Natural Resources
Objective 4
“Lamprey pots” (USFWS)~ Late-June – early-July~ Multiple modifications~ Fished various locations in fish ladder
Long-handled dip net~ Late-June – August~ Fished each pool 1 time/hr~ Same location each time
Floy Tag
Fin Clip
199 Lamprey Tagged
Results - Tagging
Results – Recapture
Confederated Tribes of Warm Springs Reservation, Oregon
Department of Natural Resources
Objective 4
Primary Tag Retention 77%
35 Recaptures (17.6% recapture rate)
11 Netting; 22 Creel; 2 Tribal member
returns
Confederated Tribes of Warm Springs
Reservation, OregonDepartment of Natural Resources
Objective 4
Methods – Tribal Harvest~ Access site creel survey
~ Mid-June - August~ 4 weekdays; 1 weekend day~ 1 hr. after sunset – 3 am
~ Creeled lamprey~ Examined for fin clip and floy tag~ Total length measured
~ Creel data expanded to estimate total tribal harvest
Results – Tribal Harvest
~ 21 interviews conducted
~ 585 lamprey collected
~ 960 estimated harvest
~ 9.25 lamprey/hr
~ Mean length: 62 cm
~ Range: 50-74 cm
Roger Jim, Sr.Celilo Falls
~ Tribal Harvest
~ Creel surveys
~ Mark-Recapture Study
~ Estimate escapement~ Tag retention~ Average movement rate
2004 Summary
ConclusionsObjective 1
Larval lamprey & Habitat
~Lamprey were present in 4 of the 13 streams sampled
~Complex habitat needs including depositional areas and woody debris
~Small sample sizes made it difficult to find relationships with lamprey presence
Confederated Tribes of Warm Springs Reservation, Oregon
Department of Natural Resources
ConclusionsObjective 2
Species Identification
~Permanent collection
~Collected through electrofishing and rotary screw trap operations
~Only observed/collected 2 or the 3 developmental stages
Confederated Tribes of Warm Springs Reservation, Oregon
Department of Natural Resources
Confederated Tribes of Warm Springs
Reservation, OregonDepartment of Natural Resources
Objective 3Timing
Shitike~ Peak movement: 2002 – March
2003 – December
WSR Ammocoetes Macropthalmia~ Peak movement: 2002 March
March 2003 May
December
Conclusions
Confederated Tribes of Warm Springs
Reservation, OregonDepartment of Natural Resources
ConclusionsObjective 4
Tribal Harvest & Upstream migration
Adult Escapement Estimate~ Marked 199 adult lamprey
~ Recaptured 35~ Tag retention 77%
Tribal Harvest~ 21 creel interview conducted – 585 lamprey~ Estimated harvest 960
Confederated Tribes of Warm Springs
Reservation, OregonDepartment of Natural Resources
2004 Summary
~ Objective 1: ~ Larval lamprey collection~ Habitat
Conclusions
~ Objective 2:~ Species identification
Confederated Tribes of Warm Springs
Reservation, OregonDepartment of Natural Resources
Conclusions2004 Summary
~ Objective 3: ~ Collect timing data ~ Conduct trap efficiencies
~ Objective 4:~ Estimate escapement~ Monitor tribal Harvest
We would like to thank Bonneville Power Administration
for funding this project.
top related