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Age, Trace Metal, Stable Isotope, and Fatty Acid Data Collected from Sturgeon Captured in the Mississippi and St. Croix Rivers, Minnesota and Wisconsin, 2015-2016. DATA

Metadata Updated: October 29, 2023

Proposed invasive carp barriers may threaten populations of migratory fishes in the St. Croix National Scenic Riverway and the Mississippi National River and Recreation Area by preventing movements between rivers needed to fulfill life history requirements. Moreover, reproducing populations of invasive carp could alter aquatic food webs and negatively affect mussels and migratory fishes. In this study, nonlethal chemical techniques were used to determine the trophic positions and migratory histories of lake sturgeon (Acipenser fulvescens) captured in the St. Croix and Mississippi rivers. Stable isotope analyses demonstrated differences in trophic position among sturgeon captured in different locations among the two rivers. Ratios of strontium to calcium (Sr:Ca) and barium to calcium (Ba:Ca) in collected water samples were characterized at six sampling locations among the two rivers. Laser ablation data obtained from cross sections of lake sturgeon pectoral fin rays indicated that lake sturgeon Sr:Ca values were different between rivers, but Sr:Ca values were similar for natal and capture locations of lake sturgeon captured in the same river. However, Sr:Ca data showed that some fish likely moved between the two rivers. Lake sturgeon captured in the Mississippi River had similar length-weight relations but higher length-at-age compared to lake sturgeon captured in the St. Croix River. Growth and Sr:Ca analyses provided evidence that the St. Croix and Mississippi rivers have separate populations of lake sturgeon that interact through migrations of individual fish between rivers. Results of this study will provide managers information about the feeding ecology and migration histories of lake sturgeon within these two park units and provide pre-invasion data for lake sturgeon should populations of invasive carp become established. In addition, laser ablation techniques presented here could be used to study other migratory fishes that serve as dispersal agents for at-risk mussel species.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date June 1, 2023
Metadata Updated Date October 29, 2023

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date October 29, 2023
Publisher U.S. Geological Survey
Identifier USGS:61575a1ad34e0df5fb9fadd4
Data Last Modified 20211026
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id c723085e-9f39-4efe-aeb0-5db411ff8519
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -92.8812,44.5396,-92.5104,45.0755
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash 08f3766b62f978203b6f1f28a82c9abba883182b6f252d7af1482f9fe48e489a
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -92.8812, 44.5396, -92.8812, 45.0755, -92.5104, 45.0755, -92.5104, 44.5396, -92.8812, 44.5396}

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