Shape, condition and diet of the pike icefish Champsocephalus esox (Teleostei: Channichthyidae): evidence of phenotypic plasticity?
Abstract The shape (derived from landmark-based geometric morphometrics), condition (Fulton index) and diet (determined through gut content analysis) were described for the pike icefish Champsocephalus esox (Channichthyidae) from Última Esperanza sound, south-west Patagonia, Chile. Based on the leng...
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crcambridgeupr:10.1017/s0954102020000425 2024-04-28T07:57:06+00:00 Shape, condition and diet of the pike icefish Champsocephalus esox (Teleostei: Channichthyidae): evidence of phenotypic plasticity? Landaeta, Mauricio F. Villegas, Ariel Hüne, Mathias 2020 http://dx.doi.org/10.1017/s0954102020000425 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102020000425 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 33, issue 1, page 10-16 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2020 crcambridgeupr https://doi.org/10.1017/s0954102020000425 2024-04-02T06:55:31Z Abstract The shape (derived from landmark-based geometric morphometrics), condition (Fulton index) and diet (determined through gut content analysis) were described for the pike icefish Champsocephalus esox (Channichthyidae) from Última Esperanza sound, south-west Patagonia, Chile. Based on the length-weight relationship, females were heavier at length than males. Nevertheless, the Fulton index was similar between males and females. The morphospace of C. esox showed high intraspecific variability in the dorsoventral position of the tip of the snout, anus and the ventral insertion of the pectoral fin, as well as the anteroposterior position of the premaxilla, opercle and anus. This indicates the existence of phenotypic plasticity, leading to specimens with larger jaws and heads but shorter trunks, or specimens with shorter jaws and heads but larger trunks. This phenotypic plasticity was independent of size and sex. The feeding incidence was similar between sexes (34.1% and 47.2% for males and females, respectively). Diets consisted of only fish, small notothenioids of the genus Patagonotothen ( P. tessellata , P. cornucola and P. sima ), showing similarities between males and females. Finally, C. esox is the second notothenioid species, and the first outside of Antarctica, to display phenotypic plasticity in its body shape. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica Icefish Cambridge University Press Antarctic Science 33 1 10 16 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
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Geology Ecology, Evolution, Behavior and Systematics Oceanography Landaeta, Mauricio F. Villegas, Ariel Hüne, Mathias Shape, condition and diet of the pike icefish Champsocephalus esox (Teleostei: Channichthyidae): evidence of phenotypic plasticity? |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract The shape (derived from landmark-based geometric morphometrics), condition (Fulton index) and diet (determined through gut content analysis) were described for the pike icefish Champsocephalus esox (Channichthyidae) from Última Esperanza sound, south-west Patagonia, Chile. Based on the length-weight relationship, females were heavier at length than males. Nevertheless, the Fulton index was similar between males and females. The morphospace of C. esox showed high intraspecific variability in the dorsoventral position of the tip of the snout, anus and the ventral insertion of the pectoral fin, as well as the anteroposterior position of the premaxilla, opercle and anus. This indicates the existence of phenotypic plasticity, leading to specimens with larger jaws and heads but shorter trunks, or specimens with shorter jaws and heads but larger trunks. This phenotypic plasticity was independent of size and sex. The feeding incidence was similar between sexes (34.1% and 47.2% for males and females, respectively). Diets consisted of only fish, small notothenioids of the genus Patagonotothen ( P. tessellata , P. cornucola and P. sima ), showing similarities between males and females. Finally, C. esox is the second notothenioid species, and the first outside of Antarctica, to display phenotypic plasticity in its body shape. |
format |
Article in Journal/Newspaper |
author |
Landaeta, Mauricio F. Villegas, Ariel Hüne, Mathias |
author_facet |
Landaeta, Mauricio F. Villegas, Ariel Hüne, Mathias |
author_sort |
Landaeta, Mauricio F. |
title |
Shape, condition and diet of the pike icefish Champsocephalus esox (Teleostei: Channichthyidae): evidence of phenotypic plasticity? |
title_short |
Shape, condition and diet of the pike icefish Champsocephalus esox (Teleostei: Channichthyidae): evidence of phenotypic plasticity? |
title_full |
Shape, condition and diet of the pike icefish Champsocephalus esox (Teleostei: Channichthyidae): evidence of phenotypic plasticity? |
title_fullStr |
Shape, condition and diet of the pike icefish Champsocephalus esox (Teleostei: Channichthyidae): evidence of phenotypic plasticity? |
title_full_unstemmed |
Shape, condition and diet of the pike icefish Champsocephalus esox (Teleostei: Channichthyidae): evidence of phenotypic plasticity? |
title_sort |
shape, condition and diet of the pike icefish champsocephalus esox (teleostei: channichthyidae): evidence of phenotypic plasticity? |
publisher |
Cambridge University Press (CUP) |
publishDate |
2020 |
url |
http://dx.doi.org/10.1017/s0954102020000425 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102020000425 |
genre |
Antarc* Antarctic Science Antarctica Icefish |
genre_facet |
Antarc* Antarctic Science Antarctica Icefish |
op_source |
Antarctic Science volume 33, issue 1, page 10-16 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102020000425 |
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Antarctic Science |
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33 |
container_issue |
1 |
container_start_page |
10 |
op_container_end_page |
16 |
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1797586782313775104 |