Historical Patterns of Skeletal Deformities in Fishes from the Willamette River, Oregon

Markle, D.; French, Ryan R.; Naman, Seth W.; Demarest, Jason

doi:10.2307/3536508

Cited by 4 publications

(15 citation statements)

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“…As in other studies (Ellis et al 1997, Markle et al 2002, the precaudal deformity load for Table 2. Relationships between mean number of trematodes at a deformity and deformity type for precaudal deformities in cleared and stained fish.…”

Section: Discussionmentioning

confidence: 62%

“…Spines include neural, haemal, finrays and pterygiophores depending on the area of the body with the deformity. northern pikeminnow was highest near Newberg, but for many species it was highest at Wheatland Ferry (Figures 3b and 5b), an area not sampled by Ellis et al (1997) and represented by small sample sizes in Markle et al (2002). Newberg and Wheatland Ferry are largely agricultural but on the margins of two cities, Newberg and Salem, while the intermediate area is agricultural (Hulse et al 2002).…”

Section: Discussionmentioning

confidence: 99%

“…We use the term precaudal in an unconventional way to refer to all centra and associated structures anteriad of preural centrum 2. Caudal centra were previously shown to be highly variable and to have little geographic signal (Markle et al 2002).…”

Section: Methodsmentioning

confidence: 99%

“…In the Willamette River, Oregon, fish vertebral deformities are unusually high, especially from river mile (RM) 26.5 to RM 55, an area known as Newberg Pool (Ellis et al 1997, Markle et al 2002, Kent et al 2004. Deformities have been found in 12 species and six families with chiselmouth, Acrocheilus alutaceus, showing the highest rates (Markle et al 2002).…”

Section: Introductionmentioning

confidence: 99%

“…Deformities have been found in 12 species and six families with chiselmouth, Acrocheilus alutaceus, showing the highest rates (Markle et al 2002). Historical samples of northern pikeminnow, Ptychocheilus oregonensis, also showed high and variable frequencies of deformities (41.1-83.3%) from 1952 to 2000 (Markle et al 2002) with no obvious long-term trend. This was a time frame including serious water quality problems that were not reversed until about 1970 (Laenen & Dojlido 1997).…”

Section: Introductionmentioning

confidence: 99%

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Patterns of fish deformities and their association with trematode cysts in the Willamette River, Oregon

et al. 2005

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SynopsisWe described skeletal deformities in Willamette River fishes from larval and juvenile specimens collected in 2002 and 2003. Deformities were found in most taxa examined but were more frequent in native broadcast spawners, especially minnows and suckers, than in native or exotic nest builders. Caudal deformities were uniformly distributed throughout the river, but precaudal deformities were more localized near the towns of Newberg and Salem (Wheatland Ferry). In northern pikeminnow, Ptychocheilus oregonensis, deformities were dependent on relative hatch date, with early season fish having about three times the deformity load as late season fish. In a subsample of northern pikeminnow and chiselmouth, Acrocheilus alutaceus, number of deformities was directly related to number of trematode metacercariae and precaudal deformities were twice as likely as caudal deformities to be associated with metacercariae. Based on a logistic regression, the probability of a precaudal deformity was dependent on number of metacercariae and geographic area with the area effect disappearing as the number of cysts increased. A separate analysis showed that some types of deformities were unlikely to be associated with metacercariae. However, even in cases where metacercariae were unlikely to be associated with deformities, metacercariae were usually present elsewhere in the fish and an indirect effect could not be dismissed. The taxonomic, spatial and temporal patterns of skeletal deformities in Willamette River fishes may be due to differences in intermediate host (snail or fish) resistance or susceptibility to parasites, to differences in life history ecology, or to anthropogenic effects that are manifest in increased precaudal deformities near Newberg and Wheatland Ferry or decreased rates elsewhere.

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Section: Discussionmentioning

confidence: 62%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Patterns of fish deformities and their association with trematode cysts in the Willamette River, Oregon

et al. 2005

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Stress induced by substantial skeletal deformities in pike fry is not reflected in otolith fluctuating asymmetry: An experiment and literature review

2022

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Environmental Stresses and Skeletal Deformities in Fish from the Willamette River, Oregon

Villeneuve

Curtis

Jenkins

et al. 2005

Environ. Sci. Technol.

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The Willamette River, one of 14 American Heritage Rivers, flows through the most densely populated and agriculturally productive region of Oregon. Previous biological monitoring of the Willamette River detected elevated frequencies of skeletal deformities in fish from certain areas of the lower (Newberg pool [NP], rivermile [RM] 26 - 55) and middle (Wheatland Ferry [WF], RM 72 - 74) river, relative to those in the upper river (Corvallis [CV], RM 125-138). The objective of this study was to determine the likely cause of these skeletal deformities. In 2002 and 2003, deformity loads in Willamette River fishes were 2-3 times greater at the NP and WF locations than at the CV location. There were some differences in water quality parameters between the NP and CV sites, but they did not readily explain the difference in deformity loads. Concentrations of bioavailable metals were below detection limits (0.6 - 1 microg/ L). Concentrations of bioavailable polychlorinated biphenyls (PCBs) and chlorinated pesticides were generally below 0.25 ng/L. Concentrations of bioavailable polycyclic aromatic hydrocarbons were generally less than 5 ng/L. Concentrations of most persistent organic pollutants were below detection limits in ovary/oocyte tissue samples and sediments, and those that were detected were not significantly different among sites. Bioassay of Willamette River water extracts provided no evidence that unidentified compounds or the complex mixture of compounds present in the extracts could induce skeletal deformities in cyprinid fish. However, metacercariae of a digenean trematode were directly associated with a large percentage of deformities detected in two Willamette River fishes, and similar deformities were reproduced in laboratoryfathead minnows exposed to cercariae extracted from Willamette River snails. Thus, the weight of evidence suggests that parasitic infection, not chemical contaminants, was the primary cause of skeletal deformities observed in Willamette River fish.

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Historical Patterns of Skeletal Deformities in Fishes from the Willamette River, Oregon

Cited by 4 publications

References 8 publications

Patterns of fish deformities and their association with trematode cysts in the Willamette River, Oregon

Patterns of fish deformities and their association with trematode cysts in the Willamette River, Oregon

Stress induced by substantial skeletal deformities in pike fry is not reflected in otolith fluctuating asymmetry: An experiment and literature review

Environmental Stresses and Skeletal Deformities in Fish from the Willamette River, Oregon

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