Trophic niches of native and nonnative fishes along a river-reservoir continuum

Abstract Instream barriers can constrain dispersal of nonnative fishes, creating opportunities to test their impact on native communities above and below these barriers. Deposition of sediments in a river inflow to Lake Powell, USA resulted in creation of a large waterfall prohibiting upstream movem...

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Autores principales:	Casey A. Pennock, Zachary T. Ahrens, Mark C. McKinstry, Phaedra Budy, Keith B. Gido
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9da8208616ec4966b4550b1848a9d71e
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spelling	oai:doaj.org-article:9da8208616ec4966b4550b1848a9d71e2021-12-02T14:59:29ZTrophic niches of native and nonnative fishes along a river-reservoir continuum10.1038/s41598-021-91730-12045-2322https://doaj.org/article/9da8208616ec4966b4550b1848a9d71e2021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-91730-1https://doaj.org/toc/2045-2322Abstract Instream barriers can constrain dispersal of nonnative fishes, creating opportunities to test their impact on native communities above and below these barriers. Deposition of sediments in a river inflow to Lake Powell, USA resulted in creation of a large waterfall prohibiting upstream movement of fishes from the reservoir allowing us to evaluate the trophic niche of fishes above and below this barrier. We expected niche overlap among native and nonnative species would increase in local assemblages downstream of the barrier where nonnative fish diversity and abundance were higher. Fishes upstream of the barrier had more distinct isotopic niches and species exhibited a wider range in δ15N relative to downstream. In the reservoir, species were more constrained in δ15N and differed more in δ13C, representing a shorter, wider food web. Differences in energetic pathways and resource availability among habitats likely contributed to differences in isotopic niches. Endangered Razorback Sucker (Xyrauchen texanus) aggregate at some reservoir inflows in the Colorado River basin, and this is where we found the highest niche overlap among species. Whether isotopic niche overlap among adult native and nonnative species has negative consequences is unclear, because data on resource availability and use are lacking; however, these observations do indicate the potential for competition. Still, the impacts of diet overlap among trophic generalists, such as Razorback Sucker, are likely low, particularly in habitats with diverse and abundant food bases such as river-reservoir inflows.Casey A. PennockZachary T. AhrensMark C. McKinstryPhaedra BudyKeith B. GidoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Casey A. Pennock Zachary T. Ahrens Mark C. McKinstry Phaedra Budy Keith B. Gido Trophic niches of native and nonnative fishes along a river-reservoir continuum
description	Abstract Instream barriers can constrain dispersal of nonnative fishes, creating opportunities to test their impact on native communities above and below these barriers. Deposition of sediments in a river inflow to Lake Powell, USA resulted in creation of a large waterfall prohibiting upstream movement of fishes from the reservoir allowing us to evaluate the trophic niche of fishes above and below this barrier. We expected niche overlap among native and nonnative species would increase in local assemblages downstream of the barrier where nonnative fish diversity and abundance were higher. Fishes upstream of the barrier had more distinct isotopic niches and species exhibited a wider range in δ15N relative to downstream. In the reservoir, species were more constrained in δ15N and differed more in δ13C, representing a shorter, wider food web. Differences in energetic pathways and resource availability among habitats likely contributed to differences in isotopic niches. Endangered Razorback Sucker (Xyrauchen texanus) aggregate at some reservoir inflows in the Colorado River basin, and this is where we found the highest niche overlap among species. Whether isotopic niche overlap among adult native and nonnative species has negative consequences is unclear, because data on resource availability and use are lacking; however, these observations do indicate the potential for competition. Still, the impacts of diet overlap among trophic generalists, such as Razorback Sucker, are likely low, particularly in habitats with diverse and abundant food bases such as river-reservoir inflows.
format	article
author	Casey A. Pennock Zachary T. Ahrens Mark C. McKinstry Phaedra Budy Keith B. Gido
author_facet	Casey A. Pennock Zachary T. Ahrens Mark C. McKinstry Phaedra Budy Keith B. Gido
author_sort	Casey A. Pennock
title	Trophic niches of native and nonnative fishes along a river-reservoir continuum
title_short	Trophic niches of native and nonnative fishes along a river-reservoir continuum
title_full	Trophic niches of native and nonnative fishes along a river-reservoir continuum
title_fullStr	Trophic niches of native and nonnative fishes along a river-reservoir continuum
title_full_unstemmed	Trophic niches of native and nonnative fishes along a river-reservoir continuum
title_sort	trophic niches of native and nonnative fishes along a river-reservoir continuum
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/9da8208616ec4966b4550b1848a9d71e
work_keys_str_mv	AT caseyapennock trophicnichesofnativeandnonnativefishesalongariverreservoircontinuum AT zacharytahrens trophicnichesofnativeandnonnativefishesalongariverreservoircontinuum AT markcmckinstry trophicnichesofnativeandnonnativefishesalongariverreservoircontinuum AT phaedrabudy trophicnichesofnativeandnonnativefishesalongariverreservoircontinuum AT keithbgido trophicnichesofnativeandnonnativefishesalongariverreservoircontinuum
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Trophic niches of native and nonnative fishes along a river-reservoir continuum

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