Nutrient loading by anadromous fishes : species-specific contributions and the effects of diversity

Twining, Cornelia W.; Palkovacs, Eric P.; Friedman, Maya A.; Hasselman, Daniel J.; Post, David M.

Nutrient loading by anadromous fishes : species-specific contributions and the effects of diversity

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Date

2017

Authors

Twining, Cornelia W.

Palkovacs, Eric P.

Friedman, Maya A.

Hasselman, Daniel J.

Post, David M.

Publication type

Journal article

Publication status

Published

Published in

Canadian Journal of Fisheries and Aquatic Sciences ; 74 (2017), 4. - pp. 609-619. - Canadian Science Publishing (NRC Research Press). - ISSN 0706-652X. - eISSN 1205-7533

Abstract

Anadromous fishes exhibit diverse life history and functional traits. Spawning anadromous fishes bring nutrients to fresh waters, and their life history and functional traits can influence nutrient loading patterns. We asked how nutrient inputs varied across 12 species of North American anadromous fishes and how these patterns affected river-wide trends in nutrient loading. We used portfolio effect analyses to assess whether diversity stabilized or destabilized nutrient inputs to freshwater ecosystems over time. Recent decreases in body size reduced per individual nutrient loading for several key species, which in turn decreased cumulative loading. Invasion also altered nutrient loading; non-native American shad (Alosa sapidissima) now provide nearly half of the annual marine-derived nutrient inputs to the Columbia River. Counter to expectations, species diversity (richness and evenness) did not significantly increase the stability of nutrient inputs to fresh waters. Species loss in the Connecticut River increased stability, while species gain in the Columbia River decreased stability.

Summary in another language

Les poissons anadromes présentent des cycles biologiques et des caractères fonctionnels variés. Les poissons anadromes reproducteurs apportent des éléments nutritifs dans les milieux d’eau douce, et leur cycle biologique et leurs caractères fonctionnels peuvent influencer la répartition de la charge en éléments nutritifs. Nous avons examiné les variations des apports en éléments nutritifs entre 12 espèces de poissons anadromes nord-américains et l’incidence de ces variations sur l’évolution de la charge en éléments nutritifs à l’échelle de la rivière. Nous avons utilisé des analyses de l’effet de portefeuille pour déterminer si la diversité stabilisait ou déstabilisait les apports en éléments nutritifs dans les écosystèmes d’eau douce au fil du temps. Des diminutions récentes de la taille du corps ont entraîné une baisse de la charge en éléments nutritifs par individu pour plusieurs espèces clés, ce qui s’est traduit par une baisse des charges cumulatives. Les invasions ont également modifié la charge en éléments nutritifs; l’alose savoureuse (Alosa sapidissima), une espèce non indigène, représente aujourd’hui près de la moitié des apports annuels en éléments nutritifs d’origine marine dans le fleuve Columbia. Contrairement aux attentes, la diversité spécifique (richesse et uniformité) n’a pas entraîné une augmentation significative de la stabilité des apports en éléments nutritifs dans les milieux d’eau douce. La disparition d’espèces dans le fleuve Connecticut a accru la stabilité, alors que l’apparition d’espèces dans le fleuve Columbia a réduit la stabilité.

Subject (DDC)

570 Biosciences, Biology

Cite This

ISO 690

TWINING, Cornelia W., Eric P. PALKOVACS, Maya A. FRIEDMAN, Daniel J. HASSELMAN, David M. POST, 2017. Nutrient loading by anadromous fishes : species-specific contributions and the effects of diversity. In: Canadian Journal of Fisheries and Aquatic Sciences. Canadian Science Publishing (NRC Research Press). 74(4), pp. 609-619. ISSN 0706-652X. eISSN 1205-7533. Available under: doi: 10.1139/cjfas-2016-0136

BibTex

@article{Twining2017Nutri-51792,
  year={2017},
  doi={10.1139/cjfas-2016-0136},
  title={Nutrient loading by anadromous fishes : species-specific contributions and the effects of diversity},
  number={4},
  volume={74},
  issn={0706-652X},
  journal={Canadian Journal of Fisheries and Aquatic Sciences},
  pages={609--619},
  author={Twining, Cornelia W. and Palkovacs, Eric P. and Friedman, Maya A. and Hasselman, Daniel J. and Post, David M.}
}

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Refereed

Unknown