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Lumping and Splitting of Distribution Models Across a Biogeographic Divide Informs the Conservation of an Imperiled Fluvial Fish.

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Title: Lumping and Splitting of Distribution Models Across a Biogeographic Divide Informs the Conservation of an Imperiled Fluvial Fish.
Authors: Nguyen, Briant D.1 (AUTHOR), Messick, Jenna1 (AUTHOR), Rodger, Anthony W.2 (AUTHOR), Jackson, Victoria1 (AUTHOR), Butler, Christopher1,3 (AUTHOR), Taylor, Andrew T.1,4 (AUTHOR) andrew.taylor@ung.edu
Source: Ecology & Evolution (20457758). Apr2025, Vol. 15 Issue 4, p1-16. 16p.
Subject Terms: *Rare fishes, *Ecological models, *Ecological niche, *Endangered species, *Freshwater fishes
Abstract: Freshwater fishes are among the most threatened taxa in the world. A major challenge for the conservation and management of threatened fishes is scarce information regarding life history, habitat requirements, and the drivers of declines. Species distribution models (SDMs) that leverage existing occurrence records and geospatial data have aided in addressing these challenges. We used SDMs to better understand large‐scale distributional patterns of Bluntface Shiner (Cyprinella camura; BFS), a minnow facing declines across its range. We modeled the potential distribution of BFS based on natural, abiotic factors and existing occurrence records to identify landscape‐scale factors underlying their distribution. We also compared environmental conditions between their disjunct ranges east and west of the Mississippi River and examined model transferability when projecting models into opposing ranges. Our analyses revealed a naturally fragmented distribution both east and west of the Mississippi River, but populations to the east of the Mississippi River occupy streams with broadscale environmental conditions that differ from those to the west. Models projected across the Mississippi River did not reflect the contemporary range of BFS, underscoring differences in occupied niches on either side of the biogeographic divide and emphasizing the need for caution when projecting SDMs to novel ranges. Our results provide a baseline to gauge range loss of BFS, highlight areas of high suitability for conservation, and identify locations where further sampling or research may be warranted. [ABSTRACT FROM AUTHOR]
Copyright of Ecology & Evolution (20457758) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
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  Data: Lumping and Splitting of Distribution Models Across a Biogeographic Divide Informs the Conservation of an Imperiled Fluvial Fish.
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  Data: <searchLink fieldCode="AR" term="%22Nguyen%2C+Briant+D%2E%22">Nguyen, Briant D.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Messick%2C+Jenna%22">Messick, Jenna</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rodger%2C+Anthony+W%2E%22">Rodger, Anthony W.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jackson%2C+Victoria%22">Jackson, Victoria</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Butler%2C+Christopher%22">Butler, Christopher</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Taylor%2C+Andrew+T%2E%22">Taylor, Andrew T.</searchLink><relatesTo>1,4</relatesTo> (AUTHOR)<i> andrew.taylor@ung.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22Ecology+%26+Evolution+%2820457758%29%22">Ecology & Evolution (20457758)</searchLink>. Apr2025, Vol. 15 Issue 4, p1-16. 16p.
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  Data: *<searchLink fieldCode="DE" term="%22Rare+fishes%22">Rare fishes</searchLink><br />*<searchLink fieldCode="DE" term="%22Ecological+models%22">Ecological models</searchLink><br />*<searchLink fieldCode="DE" term="%22Ecological+niche%22">Ecological niche</searchLink><br />*<searchLink fieldCode="DE" term="%22Endangered+species%22">Endangered species</searchLink><br />*<searchLink fieldCode="DE" term="%22Freshwater+fishes%22">Freshwater fishes</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Freshwater fishes are among the most threatened taxa in the world. A major challenge for the conservation and management of threatened fishes is scarce information regarding life history, habitat requirements, and the drivers of declines. Species distribution models (SDMs) that leverage existing occurrence records and geospatial data have aided in addressing these challenges. We used SDMs to better understand large‐scale distributional patterns of Bluntface Shiner (Cyprinella camura; BFS), a minnow facing declines across its range. We modeled the potential distribution of BFS based on natural, abiotic factors and existing occurrence records to identify landscape‐scale factors underlying their distribution. We also compared environmental conditions between their disjunct ranges east and west of the Mississippi River and examined model transferability when projecting models into opposing ranges. Our analyses revealed a naturally fragmented distribution both east and west of the Mississippi River, but populations to the east of the Mississippi River occupy streams with broadscale environmental conditions that differ from those to the west. Models projected across the Mississippi River did not reflect the contemporary range of BFS, underscoring differences in occupied niches on either side of the biogeographic divide and emphasizing the need for caution when projecting SDMs to novel ranges. Our results provide a baseline to gauge range loss of BFS, highlight areas of high suitability for conservation, and identify locations where further sampling or research may be warranted. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Ecology & Evolution (20457758) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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      – SubjectFull: Ecological niche
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      – TitleFull: Lumping and Splitting of Distribution Models Across a Biogeographic Divide Informs the Conservation of an Imperiled Fluvial Fish.
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              Text: Apr2025
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