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Buoyancy of sub-Antarctic notothenioids including the sister lineage of all other notothenioids (Bovichtidae)
Ist Teil von
Polar biology, 2012, Vol.35 (1), p.99-106
Ort / Verlag
Berlin/Heidelberg: Springer-Verlag
Erscheinungsjahr
2012
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The radiation of notothenioid fishes (Perciformes) in Antarctic waters was likely the result of an absence of competition in the isolated Antarctic waters and key traits such as the production of antifreeze glycoprotein and buoyancy modifications. Although notothenioids lack a swim bladder, the buoyancy of Antarctic species, ranging from neutrally buoyant to relatively heavy, corresponds to diverse life styles. The buoyancy of South American notothenioids has not been studied. Static buoyancy was measured in adult notothenioids (
n
= 263, from six species of the sub-order Notothenioidei, families Bovichtidae, Eleginopidae, Nototheniidae, and Harpagiferidae) from the Beagle Channel. Measurements were expressed as percentage buoyancy (%B). Buoyancy ranged from 3.88 to 6.96% (median, 4.0–6.7%), and therefore, all species could be considered benthic consistent with previous studies that found that neutral buoyancy in notothenioids is rare.
Harpagifer bispinis
,
Patagonotothen cornucola,
and
Cottoperca gobio
were significantly less buoyant than
Paranotothenia magellanica
. The buoyancy values of most species were concordant with known habitat preferences. These data, especially the data of
C. gobio
(sister lineage of all other nototehnioids) and
E. maclovinus
(sister lineage of the Antarctic clade of notothenioids), could be useful for understanding the diversification of this feature during the notothenioid radiation.