I don't recall any mention of the estimated proportion of cephalopod on the menu (by weight).Stomach contents regularly contained whole specimens of Patagonian toothfish, and discarded fish heads of that species (fishery waste), which were most likely eaten directly in trawls and scavenged at the bottom, respectively. Other prey items were demersal fishes (mainly the skates Bathyraja irrasa and B. eatonii, and the nototheniids Notothenia rossii and Lepidonotothen squamifrons), benthic invertebrates (e.g. sea stars, ophiurids) and carrion. The stomach of nine sharks contained big chunks of flesh (up to 30 kg), which, in 2 cases, were identified as belonging to fur seals (probably the Antarctic fur seal Arctocephalus gazella).
Archi's of 220cm ML are female and fully mature/spent. I'll bet a dollar that these animals were not taken in Antarctic waters (about as sure as I am about anything anymore), but were recovered from sharks in subantarctic waters, or sharks that have undertaken some migration from subantarctic waters, or were taken next to some Antarctic/subantarctic water mass convergence. I've yet to read the paper ... tiz sitting in my briefcase right now ...Clem said:What sticks out from Cherel & Duhamel’s benthic model for Somniosus is the presence of big Architeuthis, up to 220cm mantle length as indicated by recovered beaks. If Archis become more ammoniacal as they mature, and “sink up” when they die, then it seems unlikely that these very large specimens found in Somniosus were scavenged off the sea-floor. Does Archi spend time in the mud, then, or is something else happening?
Unless there is something funny with ammonia (I've worked with gallons of the stuff but only at room temperature) then cooler water is denser and so has a greater bouyancy but if it cools the squid then the squid will also be less bouyant. However, a dead squid would tend to cool and so become less bouyant and, atlhough you'd pos. have to do some sums, a dead squid would be more likely to sink in colder water than warmer water. You could imagine a current carrying dead squid carcasses into colder waters where the squid might sink to the bottom.Steve O'Shea said:I don't know what effect temperature would have on buoyancy; anyone want to comment?