NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Glowing Sea Surface
From: Trevor Kenchington
Date: 2003 Nov 13, 21:10 -0400
From: Trevor Kenchington
Date: 2003 Nov 13, 21:10 -0400
Fred, To have sufficient density of organisms to create an impression of continuous light (not isolated "sparks"), I think it would have to be a bloom. The really small planktonic organisms ("nanoplankton" and "picoplankton") might be abundant enough even when their populations are low (or might not -- picoplankton weren't even discovered until after my undergraduate days and nonoplankton were then a new issue, so I never learnt about either group). Otherwise, I am fairly confident that such high densities are synonymous with blooms. The hurricane stirring means that this density of organisms would have to be evenly spread from surface to bottom. That means an even higher abundance than might suffice to explain the light if the water was still until some disturbance set off the plankton. Where the stirring might come in is that some species which ordinarily lives on the mud at the bottom could have been stirred up to the surface of the water. Whether that could account for the light or not, I do not know. For the light to be bioluminescence, the organisms do have to be alive -- by definition. Maybe some dead algae can glow through some physico-chemical process, just as maybe some inorganic clay particles can. I don't know. As I have noted before, many kinds of organisms can show bioluminescence, including some fish, squids, shrimps etc. However, I really doubt that any animals could be abundant enough to account for my observations. Some bacteria emit light (leave raw fish out for your cat and, in a darkened room, you may see the fish glowing a strange shade of green!) and it is possible that what I saw was phosphorescent bacteria. I have never heard of viruses creating light. Otherwise, algae are the only living things in the water. Trevor You wrote: > Trevor, > > I was not intending to insult you, but rather to answer the question > you poised a second time, after Jared & George's answer, and to point > out as best I could for the whole list that a biological explanation > was not unlikely. Given that a hurricane was stirring the waters, it > does not appear to me you have to invoke a bloom to explain what you > saw, but rather a smaller population might suffice. In addition, is > there a need for the organism(s) to be alive to phosphoresce and do > they need to be algae? > > Fred -- Trevor J. Kenchington PhD Gadus@iStar.ca Gadus Associates, Office(902) 889-9250 R.R.#1, Musquodoboit Harbour, Fax (902) 889-9251 Nova Scotia B0J 2L0, CANADA Home (902) 889-3555 Science Serving the Fisheries http://home.istar.ca/~gadus