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Brad A. Seibel Shana K. Goffredi James J. Childress 《Journal of experimental marine biology and ecology》2004,313(2):375-387
The majority of squid families (Teuthoidea: Cephalopoda) exchange sodium for ammonium, creating a low-density fluid that imparts lift for neutral buoyancy. However, previous methods for measuring ammonium did not distinguish between NH4+ and various other amine compounds. The present study, using single column ion chromatography, reassessed the cation concentrations in several midwater cephalopod species. High NH4+ levels were confirmed for histioteuthid, cranchiid, and chiroteuthid and related squids. A strong relationship is reported between ammonium content and body mass in Histioteuthis heteropsis, suggesting a gradual accumulation of ammonium coincident with an ontogenetic migration to greater depths. The bathypelagic squids Bathyteuthis abyssicola and Bathyteuthis berryi, on the other hand, contained very little ammonium but rather contained large quantities of an as yet unidentified cation. The ecological significance of this compound is not yet known. Morphology in Bathyteuthid squids suggests that the unknown cation is contained intracellularly and so, unlike sequestered ammonia, does not diminish the space available for muscle tissue. Accordingly, protein measurements in B. berryi mantle muscle are on par with shallower-living muscular squids, and in situ submersible observations reveal strong locomotory abilities relative to other deep-water squids. 相似文献
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Plant Molecular Biology - 相似文献
155.
Statolith microstructure was studied in hatchlings of deepwater-spawned
gonatid squid Gonatus onyx, caught between 1350 and
1420 m over a bottom depth of 2100 m in the San Clemente Basin off San
Diego, California. It was found that the shape and size of the hatchling
statolith were similar to those of the first-check statolith observed in
paralarvae and small juveniles of G.onyx. The inner
part of the bipartite postnuclear zone (= first-check statolith) is formed
during late embryo-genesis, and the first check within the statolith
microstructure must be considered as a starting point of increment counting
for age estimation of Gonatus spp.
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