Competition-defense tradeoff increases the diversity of microbial plankton communities and dampens trophic cascades

Mathilde Cadier*, Ken Haste Andersen, Andre Visser, Thomas Kiørboe

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The competition–defense tradeoff is a significant source of functional diversity in ecological communities. Here, we present a theoretical framework to describe the competition–defense tradeoff and apply it to a size‐based model of a unicellular plankton community. Specifically, we investigate how the emergent community structure depends on the shape of the trade‐off, and on whether the cost of defense is paid for by a lowered resource affinity or by an elevated metabolic rate. The inclusion of defense affects the size distribution and trophic strategies of the emerging community dependent on environmental conditions (eutrophic versus oligotrophic) and leads to increased diversity in size and trophic strategy under eutrophic conditions. Eutrophic conditions allow for better‐defended organisms than oligotrophic conditions. In most scenarios, competition–defense tradeoffs dampen trophic cascades in the seasonal cycle simulations, and increase the abundance of mixotrophs. We further demonstrate that it matters how the cost of defense is manifest (decreased affinity vs. increased metabolic rate), and that it has a significant effect on the resulting plankton community (overall biomass, size and feeding strategy diversity), particularly when the efficiency of the defense increases in direct proportion to the investment. Our results demonstrate that the structure of the ecosystem crucially depends on details of the defense tradeoff. This finding highlights the importance of a mechanistic understanding of defense tradeoffs, e.g. obtained through experimental measurements of specific defense mechanisms.
Original languageEnglish
JournalOikos
Volume128
Issue number7
Pages (from-to)1027-1040
Number of pages14
ISSN0030-1299
DOIs
Publication statusPublished - 2019

Keywords

  • Competition-defense tradeoff
  • Coexistense
  • Food-web modeling
  • Mixotrophy
  • Seasonal succession
  • Unicellular plankton

Cite this

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title = "Competition-defense tradeoff increases the diversity of microbial plankton communities and dampens trophic cascades",
abstract = "The competition–defense tradeoff is a significant source of functional diversity in ecological communities. Here, we present a theoretical framework to describe the competition–defense tradeoff and apply it to a size‐based model of a unicellular plankton community. Specifically, we investigate how the emergent community structure depends on the shape of the trade‐off, and on whether the cost of defense is paid for by a lowered resource affinity or by an elevated metabolic rate. The inclusion of defense affects the size distribution and trophic strategies of the emerging community dependent on environmental conditions (eutrophic versus oligotrophic) and leads to increased diversity in size and trophic strategy under eutrophic conditions. Eutrophic conditions allow for better‐defended organisms than oligotrophic conditions. In most scenarios, competition–defense tradeoffs dampen trophic cascades in the seasonal cycle simulations, and increase the abundance of mixotrophs. We further demonstrate that it matters how the cost of defense is manifest (decreased affinity vs. increased metabolic rate), and that it has a significant effect on the resulting plankton community (overall biomass, size and feeding strategy diversity), particularly when the efficiency of the defense increases in direct proportion to the investment. Our results demonstrate that the structure of the ecosystem crucially depends on details of the defense tradeoff. This finding highlights the importance of a mechanistic understanding of defense tradeoffs, e.g. obtained through experimental measurements of specific defense mechanisms.",
keywords = "Competition-defense tradeoff, Coexistense, Food-web modeling, Mixotrophy, Seasonal succession, Unicellular plankton",
author = "Mathilde Cadier and Andersen, {Ken Haste} and Andre Visser and Thomas Ki{\o}rboe",
year = "2019",
doi = "10.1111/oik.06101",
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pages = "1027--1040",
journal = "Oikos",
issn = "0030-1299",
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Competition-defense tradeoff increases the diversity of microbial plankton communities and dampens trophic cascades. / Cadier, Mathilde; Andersen, Ken Haste; Visser, Andre ; Kiørboe, Thomas.

In: Oikos, Vol. 128, No. 7, 2019, p. 1027-1040.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Competition-defense tradeoff increases the diversity of microbial plankton communities and dampens trophic cascades

AU - Cadier, Mathilde

AU - Andersen, Ken Haste

AU - Visser, Andre

AU - Kiørboe, Thomas

PY - 2019

Y1 - 2019

N2 - The competition–defense tradeoff is a significant source of functional diversity in ecological communities. Here, we present a theoretical framework to describe the competition–defense tradeoff and apply it to a size‐based model of a unicellular plankton community. Specifically, we investigate how the emergent community structure depends on the shape of the trade‐off, and on whether the cost of defense is paid for by a lowered resource affinity or by an elevated metabolic rate. The inclusion of defense affects the size distribution and trophic strategies of the emerging community dependent on environmental conditions (eutrophic versus oligotrophic) and leads to increased diversity in size and trophic strategy under eutrophic conditions. Eutrophic conditions allow for better‐defended organisms than oligotrophic conditions. In most scenarios, competition–defense tradeoffs dampen trophic cascades in the seasonal cycle simulations, and increase the abundance of mixotrophs. We further demonstrate that it matters how the cost of defense is manifest (decreased affinity vs. increased metabolic rate), and that it has a significant effect on the resulting plankton community (overall biomass, size and feeding strategy diversity), particularly when the efficiency of the defense increases in direct proportion to the investment. Our results demonstrate that the structure of the ecosystem crucially depends on details of the defense tradeoff. This finding highlights the importance of a mechanistic understanding of defense tradeoffs, e.g. obtained through experimental measurements of specific defense mechanisms.

AB - The competition–defense tradeoff is a significant source of functional diversity in ecological communities. Here, we present a theoretical framework to describe the competition–defense tradeoff and apply it to a size‐based model of a unicellular plankton community. Specifically, we investigate how the emergent community structure depends on the shape of the trade‐off, and on whether the cost of defense is paid for by a lowered resource affinity or by an elevated metabolic rate. The inclusion of defense affects the size distribution and trophic strategies of the emerging community dependent on environmental conditions (eutrophic versus oligotrophic) and leads to increased diversity in size and trophic strategy under eutrophic conditions. Eutrophic conditions allow for better‐defended organisms than oligotrophic conditions. In most scenarios, competition–defense tradeoffs dampen trophic cascades in the seasonal cycle simulations, and increase the abundance of mixotrophs. We further demonstrate that it matters how the cost of defense is manifest (decreased affinity vs. increased metabolic rate), and that it has a significant effect on the resulting plankton community (overall biomass, size and feeding strategy diversity), particularly when the efficiency of the defense increases in direct proportion to the investment. Our results demonstrate that the structure of the ecosystem crucially depends on details of the defense tradeoff. This finding highlights the importance of a mechanistic understanding of defense tradeoffs, e.g. obtained through experimental measurements of specific defense mechanisms.

KW - Competition-defense tradeoff

KW - Coexistense

KW - Food-web modeling

KW - Mixotrophy

KW - Seasonal succession

KW - Unicellular plankton

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