scholarly journals Age‐0 Shovelnose Sturgeon Prey Consumption in the Lower Missouri River

2016 ◽  
Vol 32 (8) ◽  
pp. 1819-1823 ◽  
Author(s):  
N. J. C. Gosch ◽  
M. L. Miller ◽  
T. R. Gemeinhardt ◽  
T. A. Starks ◽  
A. P. Civiello ◽  
...  
Keyword(s):  
Missouri River ◽  
Prey Consumption ◽  
Shovelnose Sturgeon

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

2013 ◽  
Vol 4 (1) ◽  
pp. 41-52 ◽  
Author(s):  
William E. French ◽  
Brian D. S. Graeb ◽  
Katie N. Bertrand ◽  
Steven R. Chipps ◽  
Robert A. Klumb
Keyword(s):  
South Dakota ◽  
Trophic Position ◽  
Fork Length ◽  
Missouri River ◽  
River System ◽  
Large River ◽  
Diet Shift ◽  
Fish Prey ◽  
Shovelnose Sturgeon ◽  
Pallid Sturgeon

Abstract 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.

Physical and hormonal examination of Missouri River shovelnose sturgeon reproductive stage: a reference guide

2007 ◽  
Vol 23 (4) ◽  
pp. 382-401 ◽  
Author(s):  
M. L. Wildhaber ◽  
D. M. Papoulias ◽  
A. J. DeLonay ◽  
D. E. Tillitt ◽  
J. L. Bryan ◽  
...  
Keyword(s):  
Missouri River ◽  
Reproductive Stage ◽  
Reference Guide ◽  
Shovelnose Sturgeon

Range-wide age and growth characteristics of shovelnose sturgeon from mark–recapture data: implications for conservation and management

2015 ◽  
Vol 72 (1) ◽  
pp. 71-82 ◽  
Author(s):  
Martin J. Hamel ◽  
Mark A. Pegg ◽  
Reuben R. Goforth ◽  
Quinton E. Phelps ◽  
Kirk D. Steffensen ◽  
...  
Keyword(s):  
River Basin ◽  
Mississippi River ◽  
Missouri River ◽  
Large River ◽  
Population Connectivity ◽  
Growth Characteristics ◽  
Age And Growth ◽  
Mark Recapture ◽  
Shovelnose Sturgeon ◽  
Commercial Harvest

We used mark–recapture data from shovelnose sturgeon (Scaphirhynchus platorynchus) to describe range-wide growth characteristics and developed a model to estimate ages. Data were solicited throughout much of the current distribution of shovelnose sturgeon, specifically from the mainstem Missouri and Mississippi rivers and their tributaries. Shovelnose sturgeon exhibited variable growth among locations; however, adult fish exhibited almost no growth after they reached a particular size, presumably the size at sexual maturity. Shovelnose sturgeon from the Mississippi River basin attained greater maximum sizes and ages compared with the Missouri River basin. However, two populations from the Mississippi River that received high exploitation from commercial harvest had truncated age distributions with smaller asymptotic lengths. Lower Missouri River populations were characteristic of exploited populations (i.e., smaller fish and reduced longevity), presumably a result of anthropogenic effects. Wide discrepancies in maximum age and size suggest shovelnose sturgeon are capable of displaying phenotypic plasticity in response to exploitation or environmental influences. Determining metapopulation dynamics is a priority because it is unknown how population connectivity may influence dynamic rate functions and persistence of large-river fishes. Identifying potential source–sink connections in terms of population dynamics may provide a template for direction of future restoration and recovery efforts.

Establishing ecologically relevant management boundaries: linking movement ecology with the conservation ofScaphirhynchussturgeon

2016 ◽  
Vol 73 (6) ◽  
pp. 877-884 ◽  
Author(s):  
Anthony P. Porreca ◽  
William D. Hintz ◽  
Gregory W. Whitledge ◽  
Neil P. Rude ◽  
Edward J. Heist ◽  
...  
Keyword(s):  
Life History ◽  
Environmental History ◽  
Mississippi River ◽  
Large Scale ◽  
Spatial Scales ◽  
Species Conservation ◽  
Missouri River ◽  
Shovelnose Sturgeon ◽  
Ecological Requirements ◽  
Pallid Sturgeon

We investigated the environmental life history of widely distributed threatened and endangered sturgeons in large rivers of the central United States that experience different regulatory regimes and management priorities. Using microchemistry techniques, our goal was to assess how to improve species conservation by dampening the incongruity that often occurs between management and species’ ecological requirements, particularly at large spatial scales. Pallid sturgeon (Scaphirhynchus albus), shovelnose sturgeon (Scaphirhynchus platorynchus), and their hybrids were analyzed for88Sr and44Ca and related to a geographically relevant range of Sr:Ca values for the Missouri and Mississippi rivers to quantify large-scale environmental history. We found natal origin of 81% of all wild sturgeon collected was the lower Missouri River. Pallid and hybrid sturgeon used the middle and upper Mississippi rivers more frequently as they aged, whereas shovelnose sturgeon occupied the lower Missouri River more often throughout life. Our results highlight a mismatch between conservation boundaries and sturgeon river use. Managers should consider expanding current protections for pallid sturgeon to include the unprotected sections of the Mississippi River and that research and conservation actions consider the importance of Mississippi River habitats to Scaphirhynchus sturgeon throughout their life history. Our findings have implications for conserving wide-ranging riverine species at large spatial scales using the framework described here.

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