Diet composition and feeding patterns of adult shovelnose sturgeon (Scaphirhynchus platorynchus) in the lower Platte River, Nebraska, USA

Rapp, Tobias; Shuman, Dane A.; Graeb, Brian D. S.; Chipps, Steven R.; Peters, Edward J.

doi:10.1111/j.1439-0426.2011.01743.x

Cited by 12 publications

(12 citation statements)

References 24 publications

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“…Estimating population size.-Sturgeon over 400 mm FL were considered adults (e.g., Rapp et al 2011) or subadults, and sturgeon less than 400 mm FL were not included in the analyses. Length-frequency histograms were assessed to identify any potential size-related gear bias for adult sturgeon.…”

Section: Methodsmentioning

confidence: 99%

Status and Habitat Use of Scaphirhynchus Sturgeons in an Important Fluvial Corridor: Implications for River Habitat Enhancement

Hintz¹,

Glover²,

Garvey³

et al. 2016

Trans Am Fish Soc

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In the central United States, recovery efforts for populations of the federally endangered Pallid Sturgeon Scaphirhynchus albus have been ongoing since its listing in 1990. Its congener, the Shovelnose Sturgeon S. platorynchus, has also recently been listed as threatened where it overlaps with Pallid Sturgeon. The status of both species in the Mississippi River is unknown and so are habitat enhancement priorities that would benefit their recovery. Using field data collected from 2002 through 2005, we (1) estimated the adult population size of both species using mark-recapture methods and (2) quantified habitat use of these sturgeons with multiple gears to elucidate habitat enhancement priorities in the middle Mississippi River-an important fluvial corridor that connects the upper Mississippi River and Missouri River basins with the lower Mississippi River basin. Population size was estimated to be 1,516 (95% CI D 710-3,463) Pallid Sturgeon (five individuals per river kilometer [rkm]) and 82,336 (95% CI D 59,438-114,585) Shovelnose Sturgeon (266 individuals/rkm). Our population estimate

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Section: Methodsmentioning

confidence: 99%

Status and Habitat Use of Scaphirhynchus Sturgeons in an Important Fluvial Corridor: Implications for River Habitat Enhancement

Hintz¹,

Glover²,

Garvey³

et al. 2016

Trans Am Fish Soc

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“…Similarly, the total number of prey families observed (36) was higher than reports from other river systems (e.g. 21 families in the MMR, Hoover et al 2007;19 families in the Lower Platte River, Rapp et al 2011; 30 families in the UWR, Bock et al 2011). Such discrepancy may be explained by the hydrological characteristics of the river.…”

Section: Discussionmentioning

confidence: 61%

Seasonal patterns in diet composition of adult shovelnose sturgeon in a free-flowing river

Nepal

Pant

Jansen

et al. 2016

Journal of Freshwater Ecology

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The relationship between seasonal diet composition of shovelnose sturgeon, Scaphirhynchus platorynchus (Rafinesque) and water discharge has not been described in large unimpounded rivers that are connected to their floodplains. We sampled adult shovelnose sturgeon from a commercially exploited population in the free-flowing Wabash River, Illinois/Indiana, USA to determine the seasonal variation in diet structure. Prey items were observed in a large proportion of individuals (97.8%), suggesting that appropriate prey taxa were widely available to shovelnose sturgeon throughout the year. Overall, Hydropsychidae, Chironomidae, Potamanthidae, and Elmidae were the most important prey taxa with winter, summer, and fall samples dominated by Hydropsychidae larvae (58.9%, 63.8%, and 73.7% by number, respectively) and spring samples dominated by Chironomidae larvae (85.9%). Remains of bony fish were observed in a few spring and winter samples. Fall and winter samples had the highest and lowest proportions of inorganic materials, respectively. Higher consumption rates were observed when prey availability coincided with precipitation events. Conservation efforts within mid-western Rivers should focus on increasing habitat complexity and hydrological connectivity within floodplains.

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“…For shovelnose sturgeon in RPMA 4 the relationship between d 15 N and FL spanned a narrower range than that in pallid sturgeon and suggested most foraging occurred at a single trophic level for the majority of sampled fish. The similar enrichment of d 15 N signatures between pallid sturgeon and shovelnose sturgeon was unexpected because field studies of shovelnose sturgeon diets in the Missouri and Platte rivers found benthic macroinvertebrates were the dominant prey in all length classes of fish, with piscivory being rare (Held 1969;Modde and Schmulbach 1977;Berry 2002;Braaten et al 2007;Wanner et al 2007;Rapp et al 2011). There was no significant relationship between FL and d 15 N for shovelnose sturgeon in RPMA 3, which was likely due to the truncated size distribution of our samples.…”

Section: Discussionmentioning

confidence: 93%

“…Estimated trophic positions and food habits of multiple life stages obtained through a mixture of SIA and stomach content techniques will allow managers to examine the importance of varying prey taxa to Scaphirhynchus and to identify habitats where important prey taxa may be limiting (Bergman et al 2008;Rapp et al 2011). Additionally, SIA will allow managers to monitor long-term broad-scale changes in riverine food webs and possible implications for long-lived riverine species.…”

Section: Introductionmentioning

confidence: 99%

Size-Dependent Trophic Patterns of Pallid Sturgeon and Shovelnose Sturgeon in a Large River System

French

Graeb

Bertrand

et al. 2013

Journal of Fish and Wildlife Management

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This study compared patterns of δ15N and δ13C enrichment of pallid sturgeon Scaphirhynchus albus and shovelnose sturgeon S. platorynchus in the Missouri River, United States, to infer their trophic position in a large river system. We examined enrichment and energy flow for pallid sturgeon in three segments of the Missouri River (Montana/North Dakota, Nebraska/South Dakota, and Nebraska/Iowa) and made comparisons between species in the two downstream segments (Nebraska/South Dakota and Nebraska/Iowa). Patterns in isotopic composition for pallid sturgeon were consistent with gut content analyses indicating an ontogenetic diet shift from invertebrates to fish prey at sizes of >500-mm fork length (FL) in all three segments of the Missouri River. Isotopic patterns revealed shovelnose sturgeon did not experience an ontogenetic shift in diet and used similar prey resources as small (<500-mm FL) pallid sturgeon in the two downstream segments. We found stable isotope analysis to be an effective tool for evaluating the trophic position of sturgeons within a large river food web.

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Diet composition and feeding patterns of adult shovelnose sturgeon (Scaphirhynchus platorynchus) in the lower Platte River, Nebraska, USA

Abstract: Two-hundred and seven adult shovelnose sturgeon ranging from 450 to 718 mm in length were sampled from June to

Cited by 12 publications

References 24 publications

Status and Habitat Use of Scaphirhynchus Sturgeons in an Important Fluvial Corridor: Implications for River Habitat Enhancement

Status and Habitat Use of Scaphirhynchus Sturgeons in an Important Fluvial Corridor: Implications for River Habitat Enhancement

Seasonal patterns in diet composition of adult shovelnose sturgeon in a free-flowing river

Size-Dependent Trophic Patterns of Pallid Sturgeon and Shovelnose Sturgeon in a Large River System

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