The efficacy of natural selection in producing optimal sex ratio adjustments in a fig wasp species
Ever since Darwin's discovery of natural selection, we expect traits to evolve to increase organisms' fitness. As a result, we can use optimization models to make a priori predictions of phenotypic variation, even when selection is frequency-dependent. A notable example is the prediction of female-biased sex ratios resulting from local mate competition (LMC) and inbreeding. LMC models incorporate the effects of LMC and inbreeding. Fig wasp sex ratio adjustments fit LMC predictions well. However, the appropriateness of LMC models to fig wasps has been questioned, and the role that a coincidental by-product plays in creating the apparent fit has been clearly illustrated. Here, we show that the sex ratio adjustments of a fig wasp are the result of a dual mechanism. It consists of a standard facultative LMC response favoured by natural selection, as well as a mechanism that may be the result of selection, but that could also be a coincidental by-product. If it is a by-product, the fitness increase is coincidental and natural selection's role was limited to fine-tuning it for higher fitness returns. We further document a case of an apparent fitness-reducing sex ratio adjustment. We conclude that the use of the adaptationist approach demands that our understanding of traits must be remodelled continually to rectify spurious assumptions.
| Errataetall: |
ErratumIn: Proc Biol Sci. 2021 Feb 24;288(1945):20210259. - PMID 33622138 |
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| Medienart: |
E-Artikel |
| Erscheinungsjahr: |
2020 |
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| Erschienen: |
2020 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:287 |
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| Enthalten in: |
Proceedings. Biological sciences - 287(2020), 1934 vom: 09. Sept., Seite 20201377 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Greeff, Jaco M [VerfasserIn] |
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| Links: |
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| Themen: |
Adaptation |
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| Anmerkungen: |
Date Completed 30.09.2020 Date Revised 10.09.2021 published: Print-Electronic figshare: 10.6084/m9.figshare.c.5104046 ErratumIn: Proc Biol Sci. 2021 Feb 24;288(1945):20210259. - PMID 33622138 Citation Status MEDLINE |
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| doi: |
10.1098/rspb.2020.1377 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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NLM314729666 |
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| 245 | 1 | 4 | |a The efficacy of natural selection in producing optimal sex ratio adjustments in a fig wasp species |
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| 500 | |a ErratumIn: Proc Biol Sci. 2021 Feb 24;288(1945):20210259. - PMID 33622138 | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a Ever since Darwin's discovery of natural selection, we expect traits to evolve to increase organisms' fitness. As a result, we can use optimization models to make a priori predictions of phenotypic variation, even when selection is frequency-dependent. A notable example is the prediction of female-biased sex ratios resulting from local mate competition (LMC) and inbreeding. LMC models incorporate the effects of LMC and inbreeding. Fig wasp sex ratio adjustments fit LMC predictions well. However, the appropriateness of LMC models to fig wasps has been questioned, and the role that a coincidental by-product plays in creating the apparent fit has been clearly illustrated. Here, we show that the sex ratio adjustments of a fig wasp are the result of a dual mechanism. It consists of a standard facultative LMC response favoured by natural selection, as well as a mechanism that may be the result of selection, but that could also be a coincidental by-product. If it is a by-product, the fitness increase is coincidental and natural selection's role was limited to fine-tuning it for higher fitness returns. We further document a case of an apparent fitness-reducing sex ratio adjustment. We conclude that the use of the adaptationist approach demands that our understanding of traits must be remodelled continually to rectify spurious assumptions | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 650 | 4 | |a adaptation | |
| 650 | 4 | |a exaptation | |
| 650 | 4 | |a fig wasps | |
| 650 | 4 | |a maladaptation | |
| 650 | 4 | |a pollinators | |
| 650 | 4 | |a sex allocation | |
| 700 | 1 | |a Pentz, Karina |e verfasserin |4 aut | |
| 700 | 1 | |a Warren, Marié |e verfasserin |4 aut | |
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