NDLI: Buoyancy studies of three morphs of the Antarctic fish Trematomus newnesi (Nototheniidae) from the South Shetland Islands

Content Provider	Springer Nature Link
Author	Eastman, Joseph T. Barrera Oro, Esteban
Copyright Year	2010
Abstract	Phenotypic plasticity, a widespread phenomenon in boreal freshwater fishes, is less apparent in the marine realm and the organism–environment interactions producing this variation are undetermined. A sample of 40 specimens of Trematomus newnesi, an inshore Antarctic fish from King George/25 de Mayo Island in the South Shetlands, was composed of 52.5% typical morphs, 27.5% large-mouth morphs and 20% intermediate morphs. Measurements of percentage buoyancy on the morphs of this sample were 3.73, 3.84 and 3.83%, respectively with no significant differences among means. Both mean dry skeletal weight as a percentage of body weight and mean oral jaw weight as a percentage of dry skeletal weight were significantly greater in large-mouth morphs compared to typical morphs. Diversification in head and jaw morphology is not accompanied by diversification in ecology as represented by buoyancy and, in spite of external appearances, measurements of buoyancy offer no support for the hypothesis that the large-mouth morph is more benthic than the typical semipelagic morph. Although a trophic basis for this polymorphism is possible, it has not yet been documented. Our discussion centers on the status of key open questions regarding morphism and highlights areas requiring more research.
Starting Page	823
Ending Page	831
Page Count	9
File Format	PDF
ISSN	07224060
Journal	Polar Biology
Volume Number	33
Issue Number	6
e-ISSN	14322056
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-01-13
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Notothenioidei Phenotypic plasticity Trophic polymorphism Skeleton Ecology Zoology Plant Sciences Microbiology Oceanography
Content Type	Text
Resource Type	Article
Subject	Agricultural and Biological Sciences

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Phenotypic plasticity in the Antarctic fish Trematomus newnesi (Nototheniidae) from the South Shetland Islands

ORIGINAL PAPER Buoyancy studies of three morphs of the Antarctic fish Trematomus newnesi (Nototheniidae) from the South Shetland Islands

Feeding habits of juvenile Trematomus newnesi (Pisces, Nototheniidae) at Potter Cove, South Shetland Islands, Antarctica

Phenotypic plasticity in the Antarctic nototheniid fish Trematomus newnesi: a guide to the identification of typical, large mouth and intermediate morphs

Egg-guarding behaviour in the Antarctic bathydraconid dragonfish Parachaenichthys charcoti

Linking population trends of Antarctic shag (Phalacrocorax bransfieldensis) and fish at Nelson Island, South Shetland Islands (Antarctica)

Age validation of juvenile Notothenia rossii at Potter Cove, South Shetland Islands, using mark-recapture data

X-cell disease in Antarctic fishes

Dietary overlap among early juvenile stages in an Antarctic notothenioid fish assemblage at Potter Cove, South Shetland Islands

Buoyancy studies of three morphs of the Antarctic fish Trematomus newnesi (Nototheniidae) from the South Shetland Islands

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Phenotypic plasticity in the Antarctic fish Trematomus newnesi (Nototheniidae) from the South Shetland Islands

ORIGINAL PAPER Buoyancy studies of three morphs of the Antarctic fish Trematomus newnesi (Nototheniidae) from the South Shetland Islands

Feeding habits of juvenile Trematomus newnesi (Pisces, Nototheniidae) at Potter Cove, South Shetland Islands, Antarctica

Phenotypic plasticity in the Antarctic nototheniid fish Trematomus newnesi: a guide to the identification of typical, large mouth and intermediate morphs

Egg-guarding behaviour in the Antarctic bathydraconid dragonfish Parachaenichthys charcoti

Linking population trends of Antarctic shag (Phalacrocorax bransfieldensis) and fish at Nelson Island, South Shetland Islands (Antarctica)

Age validation of juvenile Notothenia rossii at Potter Cove, South Shetland Islands, using mark-recapture data

X-cell disease in Antarctic fishes

Dietary overlap among early juvenile stages in an Antarctic notothenioid fish assemblage at Potter Cove, South Shetland Islands

Buoyancy studies of three morphs of the Antarctic fish Trematomus newnesi (Nototheniidae) from the South Shetland Islands