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ill.; Report title; "Al Galipeau, Socio Economics Studies, NPS, WASO/Denver, 7/12/94."
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maps ; Thesis (M.U.P.)--University of Oregon, 1983; Includes vita and abstract; Includes bibliographical references (leaves 91-101)
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We analyzed the reproductive biology and demographics of the Lost River sucker Deltistes luxatus and shortnose sucker Chasmistes brevirostris, two endangered species endemic to the upper Klamath Basin ...
Citation Citation
- Title:
- Reproductive biology and demographics of endangered Lost River and shortnose suckers in Upper Klamath Lake, Oregon
- Author:
- Perkins, David L.; Scoppettone, Gary; Buettner, Mark
- Year:
- 2000, 2005
We analyzed the reproductive biology and demographics of the Lost River sucker Deltistes luxatus and shortnose sucker Chasmistes brevirostris, two endangered species endemic to the upper Klamath Basin of Oregon and California, from 1984-1997. Lost River suckers had distinct river and lake shoreline spawning stocks, and individuals of both species commonly spawned in consecutive years. In the Williamson River and lower Sprague River, spawning migration by both species occurred mainly during a 5-week period that started within the first three weeks of April and peaked between mid April and early May, although a separate, earlier (mid March) run of Lost River suckers may also spawn in the upper Sprague River. Migration of both species was several times higher at dawn (0500-0730 h) and evening (1800-2200 h) than other times of the day. Peak migrations almost always corresponded to peaks in water temperature, usually at 10-15°C. Lost River suckers were captured at springs along the east shore of the lake from late February through mid May, with peak spawning usually in mid March to mid April. Shortnose suckers were generally captured at the springs from late March through late May, but the time of peak spawning was not determined. Size and age at maturity was determined by recruitment from a strong year class (1991). Male Lost River suckers began recruitment into the adult population at age 4+ (375-475 mm). Substantial recruitment of females did not begin until age 7+ (510-560 mm). Male and female shortnose suckers began recruitment at age 4+, with the majority offish recruited by age 5+. Males recruited at 270-370 mm; females recruited at 325-425 mm. Fecundity estimates were quite variable ranging from 44,000-236,000 eggs per female Lost River sucker and 18,000-72,000 eggs per female shortnose sucker. In 1984 and 1985, the spawning populations of both species were dominated by large, old individuals, with little indication of recent adult recruitment. In the next 13 years, only one strong year class (1991) recruited into the spawning populations of both species. This year class temporarily boosted population numbers, but annual fish kills from 1995 to 1997 eliminated most adults of both species. Associated with poor water quality caused by the proliferation and decay of blue-green algae Aphanizomenonflos-aquae, these fish kills raise concern that alterations to the lake ecosystem over the past several decades have Perkins et al. Lost River and shortnose suckers 5 increased the magnitude and frequency of poor water quality. As a result, mortality rates of all life stages may have increased, thereby disrupting the species' life history pattern and potentially decreasing long-term population viability. Introduction The Lost River sucker Deltistes luxatus and shortnose sucker Chasmistes brevirostris are large, long-lived suckers endemic to the upper Klamath Basin of Oregon and California. Both species are typically lake dwelling but migrate to tributaries or shoreline springs to spawn (Moyle 1976, Scoppettone and Vinyard 1991). Once extremely abundant (Cope 1884, Gilbert 1898), both species have experienced severe population declines and were federally listed as endangered in 1988 (USFWS 1988). Much of the original habitat of these suckers has been destroyed or altered by conversion of lake areas to agriculture, dams, instream flow diversions, and water quality problems associated with timber harvest, loss of riparian vegetation, livestock grazing, and agricultural practices (USFWS 1988). Knowledge of the life history of Lost River and shortnose suckers is fundamental to recovery of these species. The objective of this report was to present the results of studies conducted from 1987-1998 on the reproductive biology and demographics of Lost River and shortnose suckers, and to compare these results with earlier unpublished data. Study Sites Studies were conducted on Upper Klamath Lake and the lower Williamson-Sprague river system (Figure 1). These waters form the upper portion of the Klamath River Basin in south-central Oregon and represent most remaining native habitat of Lost River and shortnose suckers. Upper Klamath Lake is a remnant of pluvial Lake Modoc that included eight major basins and encompassed 2,839 km2 (Dicken 1980). Today, Upper Klamath Lake serves as a storage reservoir that provides water for agricultural irrigation, waterfowl refuges, instream flow requirements of anadromous fish, and hydroelectric power generation. At full capacity, the lake covers approximately 360 km2 and has an average depth of 2.4 m. Most deeper water (3-12 m) is restricted to narrow trenches along the western shore. Lake elevation is controlled at the outlet by Link River
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ill., maps; Shipping list no.: 90-263-P; "May 1990."; Includes bibliographical references
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chiefly ill., maps; "The visitor study was conducted August 3-9, 2001 by the National Park Service (NPS) Visitor Services Project (VSP), part of the Cooperative Park Studies Unit at the University of ...
Citation Citation
- Title:
- Crater Lake National Park visitor study, summer 2001
- Author:
- Littlejohn, Margaret
- Year:
- 2002, 2009
chiefly ill., maps; "The visitor study was conducted August 3-9, 2001 by the National Park Service (NPS) Visitor Services Project (VSP), part of the Cooperative Park Studies Unit at the University of Idaho"--P. 1.; "April 2002."; "NPS D-313"--Last printed p.
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Fact sheet summarizing the reasons behind the five-year review of the issues surrounding the Klamath sucker fish
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47. [Image] Crater Lake market assessment
ill., maps; "Final report"--Cover; "January 1992."Citation -
48. [Image] Monitoring of Lost River and Shortnose suckers and shoreline spawning areas in Upper Klamath Lake, 1999
Monitoring of Lost River and Shortnose Suckers at Shoreline Spawning Areas in Upper Klamath Lake, 1999 Prepared by: Rip S. Shively1 Mark F. Bautista2 Andre E. Kohler2 1 U. S. Geological Survey, Biological ...Citation Citation
- Title:
- Monitoring of Lost River and Shortnose suckers and shoreline spawning areas in Upper Klamath Lake, 1999
- Author:
- Shively, Rip S.; Bautista, Mark F.; Kohler, Andre E.
- Year:
- 1999, 2005
Monitoring of Lost River and Shortnose Suckers at Shoreline Spawning Areas in Upper Klamath Lake, 1999 Prepared by: Rip S. Shively1 Mark F. Bautista2 Andre E. Kohler2 1 U. S. Geological Survey, Biological Resources Division Klamath Falls Duty Station 6937 Washburn Way Klamath Falls, OR 97603 2 Johnson Controls World Services Inc. NERC Operation Post Office Box 270308 Fort Collins, CO 80527 Executive Summary In 1999, we sampled Lost River { Deltistes luxatus) and shortnose ( Chasmistes brevirostris) suckers from 5 April to 17 June at five shoreline spawning locations in Upper Klamath Lake ( UKL). Trammel nets were set to encompass identified spawning areas and were fished approximately 1- 1.5 hours before sunset until 3 hours after sunset or until 20 or more fish were captured. A total of 808 Lost River and 19 shortnose suckers were captured from Sucker, Silver Building, Ouxy, and Boulder springs, and Cinder Flats. The majority of Lost River suckers were captured at Cinder Flats ( 35%) and Sucker Springs ( 34%), followed by Ouxy Springs ( 16%), Silver Building Springs ( 12%), and Boulder Springs ( 3%). Males dominated the catch at all sites, but the sex ratios at Cinder Flats and Silver Building Springs were particularly skewed towards males. We recaptured 32 Lost River suckers that had been tagged during previous years sampling efforts. All of these fish, with the exception of two fish tagged at Ball Point in July, were originally tagged during the spawning season at shoreline spawning areas in UKL. This information provides further evidence that distinct stocks of Lost River suckers exist based on spawning location ( i. e., UKL and Williamson River). We also recaptured 23 Lost River suckers that were tagged in 1999 at shoreline spawning areas. Approximately half of these fish were recaptured at different locations than tagged indicating these fish were moving between spawning areas. The size offish captured at shoreline spawning areas decreased as the spawning season progressed, although the decrease in size was not as dramatic as reported in previous years. A limited number of shortnose suckers were captured at shoreline spawning areas in 1999, with a majority sampled after 1 May. Previous data for shortnose suckers at these sites is limited with respect to size, timing of spawning, sex composition, and relative numbers. Continuation of systematic sampling efforts at shoreline spawning areas will provide valuable information on the demographics and life history of Lost River and shortnose suckers utilizing these areas. Acknowledgements We thank Anita Baker, Brooke Bechen, Lani Hickey, and Tonya Wiley for assisting with sampling offish at shoreline spawning areas. Mark Buettner and Brian Peck ( U. S. Bureau of Reclamation) provided support during the early phases of our sampling as well as helpful comments on this report. We also appreciate the cooperation and support of Larry Dunsmoor ( Klamath Tribes) for identifying spawning areas, providing logistical support, and for the thoughtful review of this report. Cassandra Watson and Elizabeth Neuman produced finalized versions of tables and figures within this report and their efforts are greatly appreciated. This research was funded by the U. S. Geological Survey, Biological Resources Division through the Western Reservoirs Initiative. Introduction Severe water quality problems in Upper Klamath Lake ( UKL) have led to critical fisheries concerns for the region. Historically, UKL was eutrophic but has become hypereutrophic ( Goldman and Home 1983) presumably due to land- use practices within the basin ( USFWS 1993). As a result, the algal community has shifted to a monoculture of the blue- green algae Aphanizomemon flos- aquae and massive blooms of this species have been directly related to poor water quality episodes in UKL. The growth and decomposition of dense algal blooms in the lake frequently cause extreme water quality conditions characterized by high pH ( 9- 10.5), widely variable dissolved oxygen ( anoxic to supersaturated), and high ammonia concentrations (> 0.5 mg/ 1 unionized). In addition to water quality problems associated with A. flos- aquae, it is believed the loss of marsh habitat near the lake, timber harvest, removal of riparian vegetation, livestock grazing, and agricultural practices within the basin has contributed to hypereutrophic conditions. It is likely that these disturbances have altered the UKL ecosystem substantially enough to contribute to the near monoculture of A. flos- aquae. Investigations in 1913 documented the algal community as a diverse mix of blue- green and diatom communities, however, by the 1950' s A. flos- aquae was dominant ( USFWS 1993). The Lost River sucker ( Deltistes luxatus) and shortnose sucker ( Chasmistes brevirostris) are endemic to the Upper Klamath Basin of California and Oregon ( Moyle 1976). Declining population trends for both species were noted as early as the mid- 1960' s, however, the severities of the population declines were not evident until the mid- 1980' s. In 1988 the U. S. Fish and Wildlife Service listed both Lost River and shortnose suckers as endangered. Suspected reasons for their decline included damming of rivers, dredging and draining of marshes, water diversions, hybridization, competition and predation by exotic species, insularization of habitat, and water quality problems associated with timber harvest, removal of riparian vegetation, livestock grazing, and agricultural practices ( USFWS 1993). The U. S. Geological Survey, Biological Resources Division ( BRD) has been conducting field investigations on Lost River and shortnose suckers in UKL since 1994. The majority of these sampling efforts have focused on catching fish in UKL and the Lower Williamson River. Sampling in the Lower Williamson River focused on developing indices of relative abundance of Lost River and shortnose suckers. In 1999, Oregon State University continued sampling in the Lower Williamson River fishing trammel nets from April to August at four standardized locations. In addition to sampling efforts in the Lower Williamson River, BRD crews conducted periodic sampling at several shoreline spawning areas on the east side of UKL. This sampling was beneficial because it provided information on species composition, size, and sex ratios of suckers utilizing these areas. However, temporal changes in abundance may have been missed because consistent sampling never occurred throughout the entire spawning season ( Perkins et al, In preparation). Recently, there has been increased concern on the effects of water level management in UKL on spawning suckers. Information is needed on the timing, relative abundance, and distribution of sucker spawning in UKL to make informed decisions with respect to management of lake elevation. In 1999, we conducted systematic trammel netting surveys at Sucker, Silver Building, Ouxy, and Boulder springs and Cinder Flats along the east shore of UKL. In addition, we sampled periodically at Barkley Springs and Modoc Point to determine if suckers were utilizing these areas for spawning. This report summarizes data collected in 1999 on shoreline spawning populations of Lost River and shortnose suckers with emphasis on timing, species composition, sex ratios, and relative abundance. Methods We conducted systematic trammel netting surveys at five locations along the east shore of UKL ( Figure 1). We began sampling at Cinder Flats, Sucker, Silver Building, and Ouxy springs in early April with Boulder Springs added to the list of sampling sites on 27 April. In addition to these sites, we periodically sampled at Barkley Springs and Modoc Point ( Table 1). We attempted to sample each site twice per week although certain sites were only sampled once per week when catch rates of suckers were low ( i. e., less than 5 fish per evening). Trammel nets were fished for about 4 hours ( approximately 1- 1.5 hours before sunset until 3 hours after dark) or until we captured 20 or more fish. Nets used at individual sites varied in length from 15- 30 m, were 1.8 m tall with two outer panels ( 30cm bar mesh), an inner panel ( 3.8 cm bar mesh), a foam core float line, and a lead core bottom line. Generally, we set 1- 2 nets starting at the shoreline and extending out to encompass the perimeter of the identified spawning area. Nets were checked at approximately 1 hour intervals and captured fish were cut from the inner mesh panel and placed in a mesh cage and processed within 2 hours. Suckers were identified by species and sex, measured to the nearest mm ( fork length), inspected for tags ( both PIT and Floy tags), and examined for physical afflictions ( e. g., presence oiLernaea spp. and lamprey scars). If a sucker did not have a PIT tag, one was inserted with a hypodermic needle along the ventral surface 1- 2 cm anterior of the pelvic girdle. The catch per unit effort ( CPUE) of adult Lost River suckers was calculated for individual sampling locations for each evening sampled. Because identified spawning areas varied in size we used different length trammel nets to encompass the spawning areas. We did not attempt to standardize CPUE based on length of trammel nets used at each location. Results We sampled shoreline spawning areas from 5 April - 17 June capturing a total of 808 Lost River suckers and 19 shortnose suckers from 5 sites ( Table 1). Lost River and shortnose suckers were captured at Sucker Springs, Silver Building Springs, Ouxy Springs, and Cinder Flats, while only Lost River suckers were captured at Boulder Springs. No suckers were captured at Barkley Springs and Modoc Point ( Table 1). The majority of Lost River suckers were captured at Cinder Flats ( 35%) and Sucker Springs ( 34%; Figure 2). Males dominated the catch at all sites and were generally smaller ( mean length = 538 mm) than females captured ( mean length = 596 mm). In particular, sex ratios ( males to females) were most skewed at Cinder Flats and Silver Building Springs ( Figure 3). Large females (> 650 mm) were captured at most sites, except Boulder Springs, and the size range offish captured over time remained similar with the exception that a fewer large individuals (> 600 mm) were captured in the late sampling period ( 1 May - 17 June) as compared to the early sampling period ( 6- 30 April; Figure 4; Appendix Figure A). The catch of shortnose suckers was limited at all sites sampled. Most ( 12 of 19) of the shortnose suckers were collected at Sucker Springs, with 1- 3 fish captured at Cinder Flats, Ouxy Springs, and Silver Building Springs ( Table 1). We identified 8 males and 8 females during the sampling period and were unable to determine sex for three individuals. The mean size of shortnose suckers was 360 mm ( range 289- 528 mm) similar to data reported by Perkins et al. ( In preparation) from Sucker, Silver Building, and Ouxy springs. We observed the highest CPUE of Lost River suckers at Cinder Flats ( mean CPUE= 12.7/ h) followed by Sucker Springs ( mean CPUE= 6.0/ h), Silver Building Springs ( mean CPUE = 2.8/ h), and Ouxy Springs ( mean CPUE= 2.4/ h) ( Figure 5). On three occasions at Cinder Flats, 20 or more suckers were captured within an hour or less resulting in the termination of sampling for the evening. CPUE was calculated for sampling dates at Boulder Springs ( mean CPUE= 1.4/ h), although comparisons with other sites is not applicable because this site was not initially included in systematic sampling efforts. We did not calculate CPUE for shortnose suckers. We captured a total of 32 Lost River and 2 shortnose suckers that were tagged during previous years sampling efforts. The majority ( 96%) of these fish was originally tagged at shoreline locations ( Table 2), which is consistent with historical recapture data ( Appendix Table A). Two Lost River suckers were originally tagged at Ball Point in UKL in July, after the spawning season. In addition, most Lost River suckers were recaptured before 1 May, including 15 fish that were collected at Sucker Springs during two sampling occasions in March ( Figure 6). We also recaptured a total of 21 Lost River suckers that were tagged in 1999 at shoreline spawning areas. Approximately half of these fish were recaptured at different areas than where they were tagged, indicating that some suckers are moving between spawning areas within the season ( Table 3). Discussion Our sampling indicated the spawning period for Lost River suckers lasted from mid- March through the beginning of June at shoreline spawning areas in 1999. The catch of Lost River suckers was dominated by males at all sites sampled, particularly at Cinder Flats and Silver Building Springs. Perkins et al., ( In preparation) reported skewed sex ratios at shoreline spawning locations following the fish kills that occurred in UKL from 1995- 1997. However, the ratios we observed were considerably higher than those reported by Perkins et al., ( In preparation). At this time we are unable to determine the reason for the sex ratios observed. It is possible that males remain longer at the spawning areas than females making them more vulnerable to capture. Perkins et al., ( In preparation) observed spawning acts and reported that males remained near the actual site where spawning occurs while females move onto the spawning site only when ready to spawn. We captured 23 Lost River suckers twice in 1999 and all but one of these fish were males. However, it is difficult to determine if this percentage is due to males remaining at these sites longer than females or a reflection of the existing sex ratios. Another possible explanation could be the large numbers of males in the catch are from the 1991- 1993 year classes and females from these year classes have yet to be recruited into the adult population. The majority of males captured ( 81%) were between 475 - 574 mm. Age and growth information from Lost River suckers collected during the 1996- 1997 fish kills indicate these fish would be between 5- 9 years old ( USGS, BRD, 10 unpublished data). Perkins et al., ( In preparation) reported that male Lost River suckers migrating up the Williamson River begin to be recruited into the adult population starting at age 4+, while females did not begin to mature until age 7+ . These data were based on examining length frequency distributions and noting when fish from the 1991 year class, which is presumed to be a strong year class, began showing up in trammel net catches. Fish from the 1991 year class would have been age 8+ in 1999. Buettner and Scoppetone ( 1990) examined opercles from Lost River suckers collected during the 1986 fish kill in UKL and reported that individuals matured between 6- 14 years of age with the peak being 9 years. It is possible that in the next few years more females from the 1991- 93 year classes will be recruited into the adult population spawning at shoreline areas. Our data provides additional evidence that distinct stocks of Lost River suckers may exist based on fidelity to spawning area. Of the 32 suckers we recaptured from previous years sampling efforts, all but two were originally tagged at shoreline spawning locations. The two fish that were not originally tagged at shoreline spawning locations were captured at Ball Point in July and were not presumed to be spawning in this location. Perkins et al. ( In preparation) reported that of 316 Lost River and 11 shortnose suckers recaptured at shoreline spawning areas all were originally tagged at shoreline spawning locations. Continuation of systematic sampling at both shoreline spawning areas and the Williamson and Sprague rivers will continue to provide information on potential separation of spawning populations. The majority of recaptured fish were tagged during the first half of our sampling efforts including 13 fish that were recaptured on 25 March while sampling with Larry Dunsmoor of the Klamath Tribes. Historically, the majority of sampling effort at 11 shoreline spawning locations occurred prior to 1 May, which may explain why most recaptures were collected during the early part of our sampling period. In fiiture years, we plan to continue systematic sampling through June to determine if temporal aspects of spawning remain consistent between years. The size offish captured at shoreline spawning areas decreased as the spawning season progressed, particularly near the end of our sampling period, although the decrease was not as dramatic as reported by Perkins et al., ( In preparation). It is possible that individual timing of Lost River sucker spawning is affected by size. Scoppettone et al., ( 1986) observed that smaller, younger cui- ui ( Chasmistes cujus) at Pyramid Lake spawned at the end of the spawning season. We believe further investigation is needed to determine if differences in spawning timing among individuals is due to size or related to stock differences. A limited number of shortnose suckers were captured in 1999. Sampling continued well into June and was sufficient to detect spawning concentrations of shortnose suckers at these sites. Based on previous sampling conducted at shoreline spawning areas, there appears to be a decreasing trend in the number of shortnose suckers captured at these sites ( Perkins, et al., In preparation). Our sampling efforts at shoreline spawning areas on the east side of UKL represents the first time these areas have been systematically sampled during the spawning season. Continuation of systematic sampling at these areas is important to provide information on species composition, timing and duration of spawning, fidelity to spawning areas, sex ratios, size distribution, and relative abundance. How these 12 population characteristics change over time will also provide important insights into the population stability of Lost River and shortnose suckers in UKL. 13 Literature Cited Buettner, M. And G. Scoppettone. 1990. Life history status of catostomids in Upper Klamath Lake, Oregon. U. S. F. W. S. Completion Report. 108 pp. Goldman, C. R. and A. J. Home. 1983. Limnology. McGraw Hill, New York. Moyle, P. B. 1976. Inland fishes of California. University of California Press, Berkeley, CA. Perkins, D. L., G. G. Scoppettone, and M. Buettner. In preparation. Reproductive biology and demographics of endangered Lost River and shortnose suckers in Upper Klamath Lake, Oregon. U. S. Fish and Wildlife Service. 1993. Lost River ( Deltistes luxatus) and shortnose ( Chasmistes brevirostris) sucker recovery plan. Portland, Oregon. 108 pp. 14 Table 1. Summary of the shoreline locations sampled in Upper Klamath Lake and the number of Lost River ( LRS) and shortnose ( SNS) suckers captured in 1999. Sampling Dates Sampled Number of days Number of LRS Number of SNS Location ( range) Sampled Captured Captured Barkley Springs 4/ 5- 4/ 27 4 0 0 11 21 0 19 284 2 4 0 0 20 129 3 19 100 2 Sucker Springs 4/ 5- 6/ 17 20 274 13 Total 808 20 Boulder Springs Cinder Flats Modoc Point Ouxy Springs Silver Bldg. Springs 4/ 27- 4/ 6- 4/ 13- 4/ 6- 4/ 5- 6/ 17 6/ 17 4/ 21 6/ 17 6/ 17 15 Table 2. Summary of the number of Lost River suckers recaptured from previous years sampling efforts at shoreline spawning locations in Upper Klamath Lake, 1999. Site Originally Captured Boulder Springs Cinder Flats Ouxy Springs Silver Bldg. Springs Sucker Springs Ball Point Total Boulder Springs 0 0 0 0 0 0 0 Site Cinder Flats 0 1 0 0 4 2 7 Recaptured Ouxy Springs 0 0 0 1 1 0 2 in 1999 Silver Bldg. Springs 0 0 0 1 0 0 1 Sucker Springs 0 0 1 2 19 0 22 16 Table 3. Summary of the number of Lost River suckers recaptured at shoreline locations in Upper Klamath Lake originally tagged in 1999. Site Originally Captured in 1999 Boulder Springs Cinder Flats Ouxy Springs Silver Bldg. Springs Sucker Springs Total Boulder Springs 0 0 0 0 0 0 Site Cinder Flats 0 3 1 3 1 8 Recaptured Ouxy Springs 0 1 0 0 3 4 in 1999 Silver Bldg. Springs 0 0 1 1 0 2 Sucker Springs 0 2 0 1 6 9 17 1. Sucker Springs 2. Silver Building Springs 3. Ouxy Springs 4. Cinder Flats 5. Boulder Springs Figure 1. Map of Upper Klamath and Agency Lakes showing major tributaries and shoreline spawning areas sampled in 1999. 18 o I 50 45 40 35 30 25 20 15 10 5 0 BOULDER SPRINGS 50 45 40 35 30 25 20 15 10 5 0 D LRS Male • LRS Female * No Fish Jtt * * * * * * OUXY SPRINGS D LRS Male • LRS Female * No Fish 50 45 40 35 30 25 20 15 10 5 0 CINDER FLATS D LRS Unknow n _ r i • LRS Male • i_ r\ o remaie ic No Fish EII1IJ n „ * * * * 50 45 40 35 30 25 20 15 10 5 0 > SILVER BUILDING SPRINGS • LRS Unknow n • LRS Male • LRS Female * No Fish D n n p » * * * * * SUCKER SPRINGS ALL AREAS COMBINED • LRS Unknown D LRS Male • LRS Female • LRS Unknow n • LRS Male • LRS Female / / / / / / Figure 2. Summary of the number and sex of Lost River Suckers ( LRS) captured at shoreline spawning areas in Upper Klamath Lake, 1999 sampling. LRS unknown refers to captured individuals in which sex could not be determined. 19 70% -, 60% 50% 40% - 30% - 20% - 10% 0% CINDER FLATS _ o_ n= 283 9.1 : 1 8C O in io in om CD o i n 70% -, 60% - 50% - 40% - 30% - 20% - 10% - 0% - BOULDER SPRINGS y n 11 7 6 2 n= 21 9.5: 1 • g si n 8 CD omr o in oo § 70% 60% 50% 40% 30% 20% 10% 0% OUXY SPRINGS om CN oi n co o ini o in in SUCKER SPRINGS 70% -, 60% - 50% - 40% - 30% - 20% - 10% - 0% - n= 129 4.1 : 0 • _ o in CD omh omoo n= 273 3.5: 1 U • - - sC O oi n oi nm om o i n 00 70% 60% 50% 40% 30% 20% - 10% 0% SILVER BUILDING SPRINGS 70% 60% - 50% - 40% 30% 20% 10% - 0% 8 CM ALL SITES 8 CO JL 8 8 i n n= 99 8.1 : 1 • H „ - in in in CD h- 00 n= 805 5.3: 1 _ D • Male • Female 8 C N O O O O O O O O O O O i n o m oin i nin oCDi nCDo i n o i nco Fork length Figure 3. Length frequency histogram of male and female Lost River suckers ( LRS) captured at shore-line spawning areas in Upper Klamath Lake, 1999. The total number of LRS captured in 1999 and ratio of males to females are presented in the upper right hand corner of each graph. 20 E QJ D 160 i 140 120 100 80 60 40 20 0 A) 1999 LR Length Frequency ( 3/ 18/ 99- 4/ 30/ 99) DMale • Female • male = 457 xM = 541.4 i siaev - jo. y female = 60 xF = 611.9 stdev = 77.2 (—| Qy O ^ D 160 140 120 100 80 60 40 20 # 4? B) o - I— # $ # C) # # $ # 1999 LR Length Frequency ( 5/ 1/ 99 - 6/ 8/ 99) DMale • Female male = 219 xM = 531.4 5> lUeV — H 1 , , — i remaie = bB xF = 582 8 stdev = 68.1 • y . _ _ # ^ # # # # # # # ^ 1999 SN Length Frequency ( 4/ 30/ 99 - 5/ 30/ 99) 1 U 14 - 12 - 10 s p. A 2 0 - , Dmale • female y y • l i y n male = 8 xM = 363 stdev - 29.7 fpryiolp — ft xF = 357.1 stdev = 35.5 Forklength ( mm) Figure 4. Length frequency for Lost River ( LRS) and shortnose ( SNS) suckers captured at shoreline spawning areas in Upper Klamath Lake, 1999. Graphs represent A) LRS caught from March 19- April 30, 1999, B) LRS caught from May 1- June 8, 1999, and C) SNS caught from April 30- May 30, 1999 ( all SNS sampling days were combined due to limited SNS numbers). Four LRS with unknown gender were not included in the graph, two were caught before May 1st, and two after May 1st. Three SNS with unknown gender were not included in the graph. 21 BOULDER SPRINGS 20 i 18 16 - I 14 12 10 8 6 4 2 0 O) O) O) 0 ) 0 ) 0 ) 0 ) 0 ) in CM O) $ § I co o L? 5 LO O) O) O) g> g> g> o r^ •<*• n ^ CN CD CD CD 45 40 - 35 30 25 20 15 10 - 5 0 CINDER FLATS 0 ) 0 ) OO - f - r in in 0 ) 0 ) 0 ) C D C D C D 1 sw 20 18 16- 14- 12 - 10 8 6 4 OUXYSPRNGS Jl 0 ) 0 ) 0 ) 0 ) OO 0 ) 0 ) 0 ) C N I O C D O) O) O) O) Q < o z: ? z in CD CD 20- 18 - 16 14 - 12 - 10 - 8 6 4 - 2 - 0 - SILVER BUILDING SPRINGS ii , II p l, « u u •———,—— O) O) O) 0 ) 0 ) 0 ) in CN O) T- CM CM O) O) O) O) O) O) CO O h » - in O) O) O) ill CD CD CD SUCKER SPRINGS ALL SITES Figure 5. Summary of catch per unit effort ( CPUE) of Lost River suckers at shoreline spawning areas in Upper Klamath Lake, 1999. Note change in scale for the Cinder Flats and the All Sites graphs. 22 BOULDER SPRINGS 14 12 10 8 -| 6 4 2 0 n= 0 0 ) 0 ) 0 ) 0 ) 0 ) 0 ) 0 ) O) CD CN O) CD CO O T - C\| ^ ^ T- CNJ CO CO CO ^" ^" ^" OUXY SPRINGS 1 C D n= 2 14 1 8 4 2^ 0 oo S ^ ^ SUCKER SPRINGS ^ £ j CNJ in in to n= 22 - U-CD CO O j - CM CO 1 C D 14 12 -\ 10 8 -] 6 4 2 - 0 CINDER FLATS n= 7 LJl 0 ) 0 ) 0 ) 0 ) 0 ) T^ Cr^ N ^? ^ T- 14 12 10 - 8 6 4 - 2 0 SILVER BUILDING SPRINGS Tt x- 00 - CN CN in in in n= 1 0 ) 0 ) 0 ) 0 ) 0 ) 0 ) 0 ) 0 ) 0 ) 0 ) 0 ) 0 ) O) CD CN O> CD CO ^ CJ ^ ^ ^ CN co co ^ j- "< t ALL SITES O) O) O) O) O) O) in in in n= 32 I 0 0) in in in Figure 6. Summary of the number of Lost River suckers recaptured at shoreline spawning areas, Upper Klamath Lake, 1999. Recaptured fish were originally tagged betweeen 1988- 1998. 23 Appendix Table A. Summary of recapture data for Lost River Suckers in the Upper Klamath Lake Basin from 1985- 1999. Sampling was generally conducted from March- July of each year, although the emphasis in sampling was during the spawning period. Recapture data includes fish that were tagged with Floy and PIT tags. Site Last Recaptured Site Originally Captured Cinder Flats Ouxy Springs Silver Bldg. Springs Sucker Springs Williamson River Sprague River Upper Lake Middle Lake Total Cinder Flats 1 0 0 4 0 0 2 0 7 Ouxy Springs 0 1 1 1 0 0 0 0 3 Silver Bldg. Springs 0 0 1 6 0 0 0 0 7 Sucker Springs 0 0 6 288 4 0 0 0 298 Williamson River 0 0 0 1 6 3 0 0 10 Sprague River 0 0 0 0 1 13 1 0 15 Upper Lake 0 0 0 0 0 0 0 0 0 Middle Lake 0 0 1 0 1 0 0 0 2 Total 1 1 9 300 12 16 3 0 342 Appendix Table B. Summary of recapture data for shortnose suckers in the Upper Klamath Lake Basin from 1985- 1999. Sampling was generally conducted from March- July of each year, although the emphasis in sampling was during the spawning period. Recapture data includes fish that were tagged with Floy and PIT tags. Site Last Recaptured Site Originally Captured Ouxy Springs Silver Bldg. Springs Sucker Springs Williamson River Sprague River Lower Lake Middle Lake Total Ouxy Springs 1 0 0 0 0 0 0 1 Silver Bldg. Springs 0 0 0 0 0 0 0 0 Sucker Springs 1 0 0 0 0 0 0 1 Williamson River 0 0 0 4 0 0 0 4 Sprague River 0 0 0 2 3 0 0 5 Lower Lake 0 0 0 0 0 0 0 0 Middle Lake 0 0 0 1 2 0 5 8 Upper Lake 0 0 0 0 0 0 0 0 Reeder Road Bridge 0 0 0 0 0 0 1 1 Total 2 0 0 7 5 0 6 20 25 5 2iu5 Appendix Figure A. Summary of the size range of Lost River suckers captured at shoreline sampling areas in Upper Klamath Lake, 1999, by date sampled.
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Internal memo between staff of the National Marine Fisheries Service dated September 27, 1996 which summarizes the issues of scientific disagreement related to the listing of three coho salmon as an endangered ...
Citation Citation
- Title:
- Scientific disagreement regarding coho salmon status under the ESA
- Author:
- Varanasi, Usha; Tillman, Michael
- Year:
- 1996, 2005
Internal memo between staff of the National Marine Fisheries Service dated September 27, 1996 which summarizes the issues of scientific disagreement related to the listing of three coho salmon as an endangered species
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