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Intraspecific diversity loss in a predator species alters prey community structure and ecosystem functions

View ORCID ProfileAllan Raffard, Julien Cucherousset, José M. Montoya, Murielle Richard, Samson Acoca-Pidolle, Camille Poésy, Alexandre Garreau, Frédéric Santoul, Simon Blanchet
doi: https://doi.org/10.1101/2020.06.10.144337
Allan Raffard
1CNRS, Université Toulouse III Paul Sabatier, Station d’Écologie Théorique et Expérimentale du CNRS à Moulis, UMR-5321, F-09200 Moulis, France
2EcoLab, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France
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  • ORCID record for Allan Raffard
  • For correspondence: allan.raffard@uclouvain.be allanraffard@outlook.com
Julien Cucherousset
3CNRS, Université Toulouse III Paul Sabatier, UMR-5174 EDB (Laboratoire Evolution & Diversité Biologique), 118 route de Narbonne, F-31062, Toulouse, France
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José M. Montoya
1CNRS, Université Toulouse III Paul Sabatier, Station d’Écologie Théorique et Expérimentale du CNRS à Moulis, UMR-5321, F-09200 Moulis, France
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Murielle Richard
1CNRS, Université Toulouse III Paul Sabatier, Station d’Écologie Théorique et Expérimentale du CNRS à Moulis, UMR-5321, F-09200 Moulis, France
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Samson Acoca-Pidolle
1CNRS, Université Toulouse III Paul Sabatier, Station d’Écologie Théorique et Expérimentale du CNRS à Moulis, UMR-5321, F-09200 Moulis, France
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Camille Poésy
1CNRS, Université Toulouse III Paul Sabatier, Station d’Écologie Théorique et Expérimentale du CNRS à Moulis, UMR-5321, F-09200 Moulis, France
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Alexandre Garreau
1CNRS, Université Toulouse III Paul Sabatier, Station d’Écologie Théorique et Expérimentale du CNRS à Moulis, UMR-5321, F-09200 Moulis, France
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Frédéric Santoul
2EcoLab, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France
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Simon Blanchet
1CNRS, Université Toulouse III Paul Sabatier, Station d’Écologie Théorique et Expérimentale du CNRS à Moulis, UMR-5321, F-09200 Moulis, France
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Abstract

Loss in intraspecific diversity can alter ecosystem functions, but the underlying mechanisms are still elusive, and intraspecific biodiversity-ecosystem function relationships (iBEF) have been restrained to primary producers. Here, we manipulated genetic and functional richness of a fish consumer (Phoxinus phoxinus), to test whether iBEF relationships exist in consumer species, and whether they are more likely sustained by genetic or functional richness. We found that both genotypic and functional richness affected ecosystem functioning, either independently or in interaction. Loss in genotypic richness reduced benthic invertebrate diversity consistently across functional richness treatments, whereas it reduced zooplankton diversity only when functional richness was high. Finally, both losses in genotypic and functional richness altered essential functions (e.g. decomposition) through trophic cascades. We concluded that iBEF relationships lead to substantial top-down effects on entire food chains. The loss of genotypic richness impacted ecological properties as much as the loss of functional richness, probably because it sustains “cryptic” functional diversity.

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

  • This article has been peer-reviewed and recommended by Peer Community in Ecology https://doi.org/10.24072/pci.ecology.100064

  • Cite as: Raffard A, Cucherousset J, Montoya JM, Richard M, Acoca-Pidolle S, Poésy C, Garreau A, Santoul F, Blanchet S (2020) Intraspecific diversity loss in a predator species alters prey community structure and ecosystem functions. bioRxiv, 2020.06.10.144337, ver. 3 peer-reviewed and recommended by PCI Ecology. https://doi.org/10.1101/2020.06.10.144337

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC 4.0 International license.
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Posted November 13, 2020.
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Intraspecific diversity loss in a predator species alters prey community structure and ecosystem functions
Allan Raffard, Julien Cucherousset, José M. Montoya, Murielle Richard, Samson Acoca-Pidolle, Camille Poésy, Alexandre Garreau, Frédéric Santoul, Simon Blanchet
bioRxiv 2020.06.10.144337; doi: https://doi.org/10.1101/2020.06.10.144337
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Intraspecific diversity loss in a predator species alters prey community structure and ecosystem functions
Allan Raffard, Julien Cucherousset, José M. Montoya, Murielle Richard, Samson Acoca-Pidolle, Camille Poésy, Alexandre Garreau, Frédéric Santoul, Simon Blanchet
bioRxiv 2020.06.10.144337; doi: https://doi.org/10.1101/2020.06.10.144337

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