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Differences in the properties of the ocular ganglia cholin esterases in the squids ommastrephes bartrami as an indicator of the isolation of populations from different parts of the disjunct range


, : Differences in the properties of the ocular ganglia cholin esterases in the squids ommastrephes bartrami as an indicator of the isolation of populations from different parts of the disjunct range. Okeanologiya 19(3): 481-486

The ommastrephid squid O. bartrami has a disjunct antitropical (bi-subtropical) range. The substrate-inhibitory properties of its optic ganglia cholinestherases (ChE) were studied in specimens from the North Atlantic, the North Pacific, the South Atlantic and the Great Australian Bight. Four substrates (salts of acetylcholine, propionylcholine, butyrylcholine and methylcholine) and 3 inhibitors (diisopropylfluorophosphate, Gd-42 [O-ethyl-S(2-methylethylsulfonoethyl)-methylthiophosphonate] and LG-62 [O-ethyl-S-(3-methylbutyl)-methylthiophosphonate]) were used. Properties of ChE are identical in squids from different areas of the southern part of the range (S. Atlantic and Great Australian Bight); the N. Atlantic and the N. Pacific squids differ from each other and from the southern forms. The results were compared with the supposed history of the formation of the disjunct range of O. bartrami. From the taxonomic point of view the squids from different parts of the range belong to different subspecies, and those from different areas of one part of the range belong to different superpopulations (population systems) of 1 ssp. The substrate-inhibitory properties of ChE of the squid optic ganglia are characteristic for a given species and subspecies, and they are identical in specimens from a given population system. Such a high specificity makes it possible to use the ChE as an indicator of the degree of isolation of different population systems of squids. [Dosidiscus gigas is also discussed.].

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