Advanced search
1 file | 4.50 MB Add to list

Unimodal head-width distribution of the European eel (Anguilla anguilla L.) from the Zeeschelde does not support disruptive selection

Pieterjan Verhelst (UGent) , Jens De Meyer (UGent) , Jan Reubens, Johan Coeck, Peter Goethals (UGent) , Tom Moens (UGent) and Ans Mouton (UGent)
(2018) PEERJ. 6.
Author
Organization
Abstract
Since the early 20th century, European eels (Anguilla anguilla L.) have been dichotomously classified into 'narrow' and 'broad' heads. These morphs are mainly considered the result of a differential food choice, with narrow heads feeding primarily on small/soft prey and broad heads on large/hard prey. Yet, such a classification implies that head-width variation follows a bimodal distribution, leading to the assumption of disruptive selection. We investigated the head morphology of 272 eels, caught over three consecutive years (2015-2017) at a single location in the Zeeschelde (Belgium). Based on our results, BIC favored a unimodal distribution, while AIC provided equal support for a unimodal and a bimodal distribution. Notably, visualization of the distributions revealed a strong overlap between the two normal distributions under the bimodal model, likely explaining the ambiguity under AIC. Consequently, it is more likely that head-width variation followed a unimodal distribution, indicating there are no disruptive selection pressures for bimodality in the Zeeschelde. As such, eels could not be divided in two distinct head-width groups. Instead, their head widths showed a continuum of narrow to broad with a normal distribution. This pattern was consistent across all maturation stages studied here.
Keywords
Maturation stages, Head dimorphism, Telemetry, Speed, Disruptive selection, Condition, European eel, Unimodality, Bimodality, FRESH-WATER, MIGRATION BEHAVIOR, SALINITY PREFERENCE, SHAPE, HABITAT, GROWTH, ECOMORPHOLOGY, POLYMORPHISM, BIMODALITY, PLASTICITY

Downloads

  • 8581858.pdf
    • full text
    • |
    • open access
    • |
    • PDF
    • |
    • 4.50 MB

Citation

Please use this url to cite or link to this publication:

MLA
Verhelst, Pieterjan, Jens De Meyer, Jan Reubens, et al. “Unimodal Head-width Distribution of the European Eel (Anguilla Anguilla L.) from the Zeeschelde Does Not Support Disruptive Selection.” PEERJ 6 (2018): n. pag. Print.
APA
Verhelst, Pieterjan, De Meyer, J., Reubens, J., Coeck, J., Goethals, P., Moens, T., & Mouton, A. (2018). Unimodal head-width distribution of the European eel (Anguilla anguilla L.) from the Zeeschelde does not support disruptive selection. PEERJ, 6.
Chicago author-date
Verhelst, Pieterjan, Jens De Meyer, Jan Reubens, Johan Coeck, Peter Goethals, Tom Moens, and Ans Mouton. 2018. “Unimodal Head-width Distribution of the European Eel (Anguilla Anguilla L.) from the Zeeschelde Does Not Support Disruptive Selection.” Peerj 6.
Chicago author-date (all authors)
Verhelst, Pieterjan, Jens De Meyer, Jan Reubens, Johan Coeck, Peter Goethals, Tom Moens, and Ans Mouton. 2018. “Unimodal Head-width Distribution of the European Eel (Anguilla Anguilla L.) from the Zeeschelde Does Not Support Disruptive Selection.” Peerj 6.
Vancouver
1.
Verhelst P, De Meyer J, Reubens J, Coeck J, Goethals P, Moens T, et al. Unimodal head-width distribution of the European eel (Anguilla anguilla L.) from the Zeeschelde does not support disruptive selection. PEERJ. 2018;6.
IEEE
[1]
P. Verhelst et al., “Unimodal head-width distribution of the European eel (Anguilla anguilla L.) from the Zeeschelde does not support disruptive selection,” PEERJ, vol. 6, 2018.
@article{8581856,
  abstract     = {Since the early 20th century, European eels (Anguilla anguilla L.) have been dichotomously classified into 'narrow' and 'broad' heads. These morphs are mainly considered the result of a differential food choice, with narrow heads feeding primarily on small/soft prey and broad heads on large/hard prey. Yet, such a classification implies that head-width variation follows a bimodal distribution, leading to the assumption of disruptive selection. We investigated the head morphology of 272 eels, caught over three consecutive years (2015-2017) at a single location in the Zeeschelde (Belgium). Based on our results, BIC favored a unimodal distribution, while AIC provided equal support for a unimodal and a bimodal distribution. Notably, visualization of the distributions revealed a strong overlap between the two normal distributions under the bimodal model, likely explaining the ambiguity under AIC. Consequently, it is more likely that head-width variation followed a unimodal distribution, indicating there are no disruptive selection pressures for bimodality in the Zeeschelde. As such, eels could not be divided in two distinct head-width groups. Instead, their head widths showed a continuum of narrow to broad with a normal distribution. This pattern was consistent across all maturation stages studied here.},
  articleno    = {e5773},
  author       = {Verhelst, Pieterjan and De Meyer, Jens and Reubens, Jan and Coeck, Johan and Goethals, Peter and Moens, Tom and Mouton, Ans},
  issn         = {2167-8359},
  journal      = {PEERJ},
  keywords     = {Maturation stages,Head dimorphism,Telemetry,Speed,Disruptive selection,Condition,European eel,Unimodality,Bimodality,FRESH-WATER,MIGRATION BEHAVIOR,SALINITY PREFERENCE,SHAPE,HABITAT,GROWTH,ECOMORPHOLOGY,POLYMORPHISM,BIMODALITY,PLASTICITY},
  language     = {eng},
  pages        = {20},
  title        = {Unimodal head-width distribution of the European eel (Anguilla anguilla L.) from the Zeeschelde does not support disruptive selection},
  url          = {http://dx.doi.org/10.7717/peerj.5773},
  volume       = {6},
  year         = {2018},
}

Altmetric
View in Altmetric
Web of Science
Times cited: