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Diet-induced phenotypic plasticity in head morphology in European eel elvers (Anguilla anguilla): the effects of hard vs soft food

Jens De Meyer UGent, Joachim Christiaens UGent and Dominique Adriaens UGent (2015) European congress of Ichthyology, Abstracts.
abstract
By bone remodeling and changing of muscle volume, fish can adapt to changes in mechanical loads they are confronted with, including dietary changes such as prey hardness. This capability of a genotype to develop different phenotypes in response to varying environment is known as phenotypic plasticity. Differences in prey type being consumed might trigger such a phenotypic plasticity in fish. In European eel, two morphotypes exist: broadheads and narrowheads. Studies based on gut content have shown that broadheads consume larger and harder prey, such as fish, whereas narrowheads feed on smaller prey, such as benthic invertebrates. These studies, however, are performed on yellow eels with a minimum length of 30 cm, and only provide indirect evidence that head shape is affected by diet differences. Here, we performed a feeding experiment on glass eels that just swam up the European rivers to start feeding. These glass eels were captured and separated in three groups: one group was given hard feed requiring biting, the second group got soft feed that could be sucked in and the final group, which acted as a control group, was given a mixture of both. We found that hard feeders developed a broader general head width and postorbital region than soft feeders. This region is associated with the location of the jaw muscles, indicating that hard feeders develop larger muscles to cope with the harder prey. Hard feeders, however, also grew more slowly than soft feeders, suggesting that net energy uptake of hard feeders was lower as prey handling required more energy and time. Specimens of the control group, finally, developed intermediate head widths, implying that they are not fully adapted to feed on either hard or soft prey. In conclusion, this study provides the first direct evidence that diet influences the head shape of European eel.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
keyword
elver eel stage, trophic plasticity, dimorphism, feeding
in
European congress of Ichthyology, Abstracts
conference name
15th European congress of Ichthyology (ECI-XV)
conference location
Porto, Portugal
conference start
2015-09-07
conference end
2015-09-11
DOI
10.3389/conf.FMARS.2015.03.00022
language
English
UGent publication?
yes
classification
C3
id
6988853
handle
http://hdl.handle.net/1854/LU-6988853
date created
2015-11-23 16:17:55
date last changed
2016-12-19 15:37:46
@inproceedings{6988853,
  abstract     = {By bone remodeling and changing of muscle volume, fish can adapt to changes in mechanical loads they are confronted with, including dietary changes such as prey hardness. This capability of a genotype to develop different phenotypes in response to varying environment is known as phenotypic plasticity. Differences in prey type being consumed might trigger such a phenotypic plasticity in fish. In European eel, two morphotypes exist: broadheads and narrowheads. Studies based on gut content have shown that broadheads consume larger and harder prey, such as fish, whereas narrowheads feed on smaller prey, such as benthic invertebrates. These studies, however, are performed on yellow eels with a minimum length of 30 cm, and only provide indirect evidence that head shape is affected by diet differences. Here, we performed a feeding experiment on glass eels that just swam up the European rivers to start feeding. These glass eels were captured and separated in three groups: one group was given hard feed requiring biting, the second group got soft feed that could be sucked in and the final group, which acted as a control group, was given a mixture of both. We found that hard feeders developed a broader general head width and postorbital region than soft feeders. This region is associated with the location of the jaw muscles, indicating that hard feeders develop larger muscles to cope with the harder prey. Hard feeders, however, also grew more slowly than soft feeders, suggesting that net energy uptake of hard feeders was lower as prey handling required more energy and time. Specimens of the control group, finally, developed intermediate head widths, implying that they are not fully adapted to feed on either hard or soft prey. In conclusion, this study provides the first direct evidence that diet influences the head shape of European eel.},
  author       = {De Meyer, Jens and Christiaens, Joachim and Adriaens, Dominique},
  booktitle    = {European congress of Ichthyology, Abstracts},
  keyword      = {elver eel stage,trophic plasticity,dimorphism,feeding},
  language     = {eng},
  location     = {Porto, Portugal},
  title        = {Diet-induced phenotypic plasticity in head morphology in European eel elvers (Anguilla anguilla): the effects of hard vs soft food},
  url          = {http://dx.doi.org/10.3389/conf.FMARS.2015.03.00022},
  year         = {2015},
}

Chicago
De Meyer, Jens, Joachim Christiaens, and Dominique Adriaens. 2015. “Diet-induced Phenotypic Plasticity in Head Morphology in European Eel Elvers (Anguilla Anguilla): The Effects of Hard Vs Soft Food.” In European Congress of Ichthyology, Abstracts.
APA
De Meyer, Jens, Christiaens, J., & Adriaens, D. (2015). Diet-induced phenotypic plasticity in head morphology in European eel elvers (Anguilla anguilla): the effects of hard vs soft food. European congress of Ichthyology, Abstracts. Presented at the 15th European congress of Ichthyology (ECI-XV).
Vancouver
1.
De Meyer J, Christiaens J, Adriaens D. Diet-induced phenotypic plasticity in head morphology in European eel elvers (Anguilla anguilla): the effects of hard vs soft food. European congress of Ichthyology, Abstracts. 2015.
MLA
De Meyer, Jens, Joachim Christiaens, and Dominique Adriaens. “Diet-induced Phenotypic Plasticity in Head Morphology in European Eel Elvers (Anguilla Anguilla): The Effects of Hard Vs Soft Food.” European Congress of Ichthyology, Abstracts. 2015. Print.