Overshooting dynamics in a model adaptive radiation

J.R. Meyer, S.E. Schoustra, J. LaChapelle, R.K. Kassen

Research output: Contribution to journalArticleAcademicpeer-review

13 Citations (Scopus)

Abstract

The history of life is punctuated by repeated periods of unusually rapid evolutionary diversification called adaptive radiation. The dynamics of diversity during a radiation reflect an overshooting pattern with an initial phase of exponential-like increase followed by a slower decline. Much attention has been paid to the factors that drive the increase phase, but far less is known about the causes of the decline phase. Decreases in diversity are rarely associated with climatic changes or catastrophic events, suggesting that they may be an intrinsic consequence of diversification. We experimentally identify the factors responsible for losses in diversity during the later stages of the model adaptive radiation of the bacterium Pseudomonas fluorescens. Proximately, diversity declines because of the loss of biofilm-forming niche specialist morphotypes. We show that this loss occurs despite the presence of strong divergent selection late in the radiation and is associated with continued adaptation of resident niche specialists to both the biotic and abiotic environments. These results suggest that losses of diversity in the latter stages of an adaptive radiation may be a general consequence of diversification through competition and lends support to the idea that the conditions favouring the emergence of diversity are different from those that ensure its long-term maintenance
Original languageEnglish
Pages (from-to)392-398
JournalProceedings of the Royal Society. B: Biological Sciences
Volume278
DOIs
Publication statusPublished - 2011

Fingerprint

adaptive radiation
dynamic models
Radiation
niches
niche
Pseudomonas fluorescens
biofilm
catastrophic event
morphotype
life history
climate change
Biofilms
bacteria
Bacteria
bacterium
History
loss
history
radiation

Keywords

  • pseudomonas-fluorescens
  • experimental evolution
  • experimental populations
  • diversification
  • divergence
  • diversity
  • phenotype
  • history

Cite this

@article{5673128649174ee3a561efcfe1a6c0d7,
title = "Overshooting dynamics in a model adaptive radiation",
abstract = "The history of life is punctuated by repeated periods of unusually rapid evolutionary diversification called adaptive radiation. The dynamics of diversity during a radiation reflect an overshooting pattern with an initial phase of exponential-like increase followed by a slower decline. Much attention has been paid to the factors that drive the increase phase, but far less is known about the causes of the decline phase. Decreases in diversity are rarely associated with climatic changes or catastrophic events, suggesting that they may be an intrinsic consequence of diversification. We experimentally identify the factors responsible for losses in diversity during the later stages of the model adaptive radiation of the bacterium Pseudomonas fluorescens. Proximately, diversity declines because of the loss of biofilm-forming niche specialist morphotypes. We show that this loss occurs despite the presence of strong divergent selection late in the radiation and is associated with continued adaptation of resident niche specialists to both the biotic and abiotic environments. These results suggest that losses of diversity in the latter stages of an adaptive radiation may be a general consequence of diversification through competition and lends support to the idea that the conditions favouring the emergence of diversity are different from those that ensure its long-term maintenance",
keywords = "pseudomonas-fluorescens, experimental evolution, experimental populations, diversification, divergence, diversity, phenotype, history",
author = "J.R. Meyer and S.E. Schoustra and J. LaChapelle and R.K. Kassen",
year = "2011",
doi = "10.1098/rspb.2010.0640",
language = "English",
volume = "278",
pages = "392--398",
journal = "Proceedings of the Royal Society. B: Biological Sciences",
issn = "0962-8452",
publisher = "Royal Society, The",

}

Overshooting dynamics in a model adaptive radiation. / Meyer, J.R.; Schoustra, S.E.; LaChapelle, J.; Kassen, R.K.

In: Proceedings of the Royal Society. B: Biological Sciences, Vol. 278, 2011, p. 392-398.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Overshooting dynamics in a model adaptive radiation

AU - Meyer, J.R.

AU - Schoustra, S.E.

AU - LaChapelle, J.

AU - Kassen, R.K.

PY - 2011

Y1 - 2011

N2 - The history of life is punctuated by repeated periods of unusually rapid evolutionary diversification called adaptive radiation. The dynamics of diversity during a radiation reflect an overshooting pattern with an initial phase of exponential-like increase followed by a slower decline. Much attention has been paid to the factors that drive the increase phase, but far less is known about the causes of the decline phase. Decreases in diversity are rarely associated with climatic changes or catastrophic events, suggesting that they may be an intrinsic consequence of diversification. We experimentally identify the factors responsible for losses in diversity during the later stages of the model adaptive radiation of the bacterium Pseudomonas fluorescens. Proximately, diversity declines because of the loss of biofilm-forming niche specialist morphotypes. We show that this loss occurs despite the presence of strong divergent selection late in the radiation and is associated with continued adaptation of resident niche specialists to both the biotic and abiotic environments. These results suggest that losses of diversity in the latter stages of an adaptive radiation may be a general consequence of diversification through competition and lends support to the idea that the conditions favouring the emergence of diversity are different from those that ensure its long-term maintenance

AB - The history of life is punctuated by repeated periods of unusually rapid evolutionary diversification called adaptive radiation. The dynamics of diversity during a radiation reflect an overshooting pattern with an initial phase of exponential-like increase followed by a slower decline. Much attention has been paid to the factors that drive the increase phase, but far less is known about the causes of the decline phase. Decreases in diversity are rarely associated with climatic changes or catastrophic events, suggesting that they may be an intrinsic consequence of diversification. We experimentally identify the factors responsible for losses in diversity during the later stages of the model adaptive radiation of the bacterium Pseudomonas fluorescens. Proximately, diversity declines because of the loss of biofilm-forming niche specialist morphotypes. We show that this loss occurs despite the presence of strong divergent selection late in the radiation and is associated with continued adaptation of resident niche specialists to both the biotic and abiotic environments. These results suggest that losses of diversity in the latter stages of an adaptive radiation may be a general consequence of diversification through competition and lends support to the idea that the conditions favouring the emergence of diversity are different from those that ensure its long-term maintenance

KW - pseudomonas-fluorescens

KW - experimental evolution

KW - experimental populations

KW - diversification

KW - divergence

KW - diversity

KW - phenotype

KW - history

U2 - 10.1098/rspb.2010.0640

DO - 10.1098/rspb.2010.0640

M3 - Article

VL - 278

SP - 392

EP - 398

JO - Proceedings of the Royal Society. B: Biological Sciences

JF - Proceedings of the Royal Society. B: Biological Sciences

SN - 0962-8452

ER -