Biology and phenotypic plasticity of the Antarctic nototheniid fish Trematomus newnesi in McMurdo Sound
Trematomus newnesi inhabited inshore (<20 m) subzero waters in McMurdo Sound where it fed in the water column on Euphausia crystallorophias and fishes. This sample included the largest reported specimens of this species. The length–weight relationship was Weight = 3.17 × 10 −6 (Standard Length) 3...
Published in: | Antarctic Science |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
1997
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1017/s0954102097000047 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102097000047 |
id |
crcambridgeupr:10.1017/s0954102097000047 |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1017/s0954102097000047 2024-03-03T08:37:43+00:00 Biology and phenotypic plasticity of the Antarctic nototheniid fish Trematomus newnesi in McMurdo Sound Eastman, Joseph T. Devries, Arthur L. 1997 http://dx.doi.org/10.1017/s0954102097000047 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102097000047 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 9, issue 1, page 27-35 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 1997 crcambridgeupr https://doi.org/10.1017/s0954102097000047 2024-02-08T08:29:59Z Trematomus newnesi inhabited inshore (<20 m) subzero waters in McMurdo Sound where it fed in the water column on Euphausia crystallorophias and fishes. This sample included the largest reported specimens of this species. The length–weight relationship was Weight = 3.17 × 10 −6 (Standard Length) 3.34 , n = 67, r 2 = 0.95. The population was phenotypically plastic, with two distinct morphs easily separated by visual inspection – the typical morph and a large mouth/broad headed morph comprising 28% of the sample. The large mouth morph had a wider and blunter head, longer upper jaw, wider gape, more heavily ossified jaws and darker colouration. To document this morphology, four views of the head are illustrated. Inference from morphology and measurements suggested that the large mouth morph was more benthic than the typical semipelagic morph. Museum specimens from Cape Adare confirmed the presence of the large mouth morph 700 km north of McMurdo Sound. This is the first clear example of phenotypic plasticity in any species of marine fish and its discovery extends the bounds of the nototheniid adaptive radiation to the population level. This finding suggests ecological and evolutionary parallels between the inshore waters of the high Antarctic shelf and the low diversity ichthyofaunas of Arctic, boreal and some temperate lakes. Although there is no data on genetic diversification, an alternate interpretation of the phenotypic plasticity is that the large mouth morph is a cryptic or sibling species. Article in Journal/Newspaper Antarc* Antarctic Antarctic Science Arctic McMurdo Sound Cambridge University Press Arctic Antarctic The Antarctic McMurdo Sound Adare ENVELOPE(170.233,170.233,-71.283,-71.283) Cape Adare ENVELOPE(175.000,175.000,-71.000,-71.000) Antarctic Science 9 1 27 35 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Eastman, Joseph T. Devries, Arthur L. Biology and phenotypic plasticity of the Antarctic nototheniid fish Trematomus newnesi in McMurdo Sound |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Trematomus newnesi inhabited inshore (<20 m) subzero waters in McMurdo Sound where it fed in the water column on Euphausia crystallorophias and fishes. This sample included the largest reported specimens of this species. The length–weight relationship was Weight = 3.17 × 10 −6 (Standard Length) 3.34 , n = 67, r 2 = 0.95. The population was phenotypically plastic, with two distinct morphs easily separated by visual inspection – the typical morph and a large mouth/broad headed morph comprising 28% of the sample. The large mouth morph had a wider and blunter head, longer upper jaw, wider gape, more heavily ossified jaws and darker colouration. To document this morphology, four views of the head are illustrated. Inference from morphology and measurements suggested that the large mouth morph was more benthic than the typical semipelagic morph. Museum specimens from Cape Adare confirmed the presence of the large mouth morph 700 km north of McMurdo Sound. This is the first clear example of phenotypic plasticity in any species of marine fish and its discovery extends the bounds of the nototheniid adaptive radiation to the population level. This finding suggests ecological and evolutionary parallels between the inshore waters of the high Antarctic shelf and the low diversity ichthyofaunas of Arctic, boreal and some temperate lakes. Although there is no data on genetic diversification, an alternate interpretation of the phenotypic plasticity is that the large mouth morph is a cryptic or sibling species. |
format |
Article in Journal/Newspaper |
author |
Eastman, Joseph T. Devries, Arthur L. |
author_facet |
Eastman, Joseph T. Devries, Arthur L. |
author_sort |
Eastman, Joseph T. |
title |
Biology and phenotypic plasticity of the Antarctic nototheniid fish Trematomus newnesi in McMurdo Sound |
title_short |
Biology and phenotypic plasticity of the Antarctic nototheniid fish Trematomus newnesi in McMurdo Sound |
title_full |
Biology and phenotypic plasticity of the Antarctic nototheniid fish Trematomus newnesi in McMurdo Sound |
title_fullStr |
Biology and phenotypic plasticity of the Antarctic nototheniid fish Trematomus newnesi in McMurdo Sound |
title_full_unstemmed |
Biology and phenotypic plasticity of the Antarctic nototheniid fish Trematomus newnesi in McMurdo Sound |
title_sort |
biology and phenotypic plasticity of the antarctic nototheniid fish trematomus newnesi in mcmurdo sound |
publisher |
Cambridge University Press (CUP) |
publishDate |
1997 |
url |
http://dx.doi.org/10.1017/s0954102097000047 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102097000047 |
long_lat |
ENVELOPE(170.233,170.233,-71.283,-71.283) ENVELOPE(175.000,175.000,-71.000,-71.000) |
geographic |
Arctic Antarctic The Antarctic McMurdo Sound Adare Cape Adare |
geographic_facet |
Arctic Antarctic The Antarctic McMurdo Sound Adare Cape Adare |
genre |
Antarc* Antarctic Antarctic Science Arctic McMurdo Sound |
genre_facet |
Antarc* Antarctic Antarctic Science Arctic McMurdo Sound |
op_source |
Antarctic Science volume 9, issue 1, page 27-35 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102097000047 |
container_title |
Antarctic Science |
container_volume |
9 |
container_issue |
1 |
container_start_page |
27 |
op_container_end_page |
35 |
_version_ |
1792500974891302912 |