Article (Scientific journals)
Body shape convergence driven by small size optimum in marine angelfishes
Frederich, Bruno; Santini, Francesco; Konow, Nicolai et al.
2017In Biology Letters, 13, p. 20170154
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Keywords :
miniaturization; trait evolution; morphospace; body form; shape; geometric morphometrics; Ornstein–Uhlenbeck; SURFACE; Pomacanthidae; coral reef fishes; macroevolution; evolutionary morphology
Abstract :
[en] Convergent evolution of small body size occurs across many vertebrate clades and may reflect an evolutionary response to shared selective press- ures. However it remains unclear if other aspects of phenotype undergo convergent evolution in miniaturized lineages. Here we present a comparative analysis of body size and shape evolution in marine angelfishes (Pomacanthidae), a reef fish family characterized by repeated transitions to small body size. We ask if lineages that evolve small sizes show convergent evolution in body shape. Our results reveal that angelfish lineages evolved three different stable size optima with one corresponding to the group of pygmy angelfishes (Centropyge). Then, we test if the observed shifts in body size are associated with changes to new adaptive peaks in shape. Our data suggest that independent evolution to small size optima have induced repeated convergence upon deeper body and steeper head profile in Centropyge. These traits may favour manoeuvrability and visual aware- ness in these cryptic species living among corals, illustrating that functional demands on small size may be related to habitat specialization and predator avoidance. The absence of shape convergence in large marine angelfishes also suggests that more severe requirements exist for small than for large size optima.
Research center :
AFFISH-RC - Applied and Fundamental FISH Research Center - ULiège
Disciplines :
Zoology
Author, co-author :
Frederich, Bruno  ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Santini, Francesco
Konow, Nicolai
Schnitzler, Joseph ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Lecchini, David
Alfaro, Michael
Language :
English
Title :
Body shape convergence driven by small size optimum in marine angelfishes
Publication date :
14 June 2017
Journal title :
Biology Letters
ISSN :
1744-9561
eISSN :
1744-957X
Publisher :
The Royal Society, United Kingdom
Volume :
13
Pages :
20170154
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Danish Research Agency
XSEDE
Available on ORBi :
since 17 June 2017

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