The Floating Life – A Tale of the Vortex

Guest Essay by Kip Hansen —  22 May 2022

There has been an interesting pre-print paper released and it received a rather odd reception in the science section of the New York Times.

The paper is “High Concentrations of floating life in the North Pacific Garbage Patch” by  Fiona Chong, Matthew Spencer, Nikolai Maximenko, Jan Hafner, Andrew McWhirter and  Rebecca R. Helm. The abstract is available here and a full text .pdf file can be found here.

I conversed with Rebecca Helm by email.  She was happy that the paper got any wide notice at all, but somewhat perplexed that it was nearly entirely misunderstood.  The paper is not about garbage, floating plastic (pelagic plastic), or the mostly-imaginary Great Pacific Garbage Patch. 

A brief note about the Great Pacific Garbage Patch: To quote NOAA: ” The name “Pacific Garbage Patch” has led many to believe that this area is a large and continuous patch of easily visible marine debris items such as bottles and other litter—akin to a literal island of trash that should be visible with satellite or aerial photographs. This is not the case. While higher concentrations of litter items ocan be found in this area, much of the debris is actually small pieces of floating plastic that are not immediately evident to the naked eye.”  And here.

The image used in the NY Times is taken by Ben Lecomte who set out to swim the Pacific, right through the Great Pacific Garbage Patch (GPGP).  It is a typical ball of abandoned or lost fishing nets and lines rolled into a mass in a similar manner in which dust bunnies are formed under your bed.  This mass of nets was not found in Locomte’s swim across the Pacific – at least it is not mentioned or pictured on his pages about the Pacific expeditions. The image used by the New York Times is not on Lecomte’s web site, but is from another time and place.  Lecomte’s  web site is here.  The web site features what appears to be a staged picture of Lecomte with pelagic plastic.  It takes several minutes to realize that Lecomte’s web page contains only four images of any real pelagic plastic.  Meaning?  Either they did not find much while swimming the entire breadth of the GPGP, or contrary to the stated purpose of their expedition, they chose not to take or display images of their findings.    

Why even mention Lecomte then?  Our authors say ”To test our hypothesis that garbage patches may also be neuston seas, including the NPGP, we conducted a community science survey through the NPGP with the sailing crew accompanying long-distance swimmer Benoît Lecomte (https://benlecomte.com/) as he swam through the NPGP (The Vortex Swim).”  [Note: the eastern North Pacific Subtropical Gyre in the area of the North Pacific “garbage patch” (NPGP).]

The authors of this paper were not looking for floating plastic but rather for the floating lifeforms known collectively as “marine neuston”.  These are the type of things they found: 

The top left image is of a “By-the-wind sailor” [Velella]. Pictured to the left are dried sails that had been blown ashore which I found on the beach at Cape Canaveral, Florida.  

The authors’ state “we hypothesize that floating life is also concentrated in other gyres with converging surface currents.”  Floating life is known to be concentrated in the Atlantic Ocean in the gyre that forms the famous Sargasso Sea in the Subtropical North Atlantic.  The authors speculated that the same could or should also be true in the eastern North Pacific Subtropical Gyre in the area of the North Pacific “garbage patch” (NPGP).  Ben Lecomte was staging an “expedition” by swimming through the Great Pacific Garbage Patch …giving the authors a chance to do a little citizen science.

The crew of the sail boat accompanying Lecomte dragged “Either a Manta trawl (width x height: 0.9 m x 0.15 m) [mouth size about 3 feet by 6 inches] or a neuston net (width x height: 1 m x 0.25 m) [ mouth size about 3 feet by 10 inches]  was towed along the sea surface for 30 minutes at each site with an attached General Oceanics Mechanical Flowmeter (model 2030R) to measure the approximate water volume filtered by the trawl”. 

The results were interesting.  The limited data collected by the project showed that, yes, neuston were being concentrated within the eastern Pacific gyre in exactly the same way that floating plastic bits were being concentrated.    Here’s the types of things they found in their trawl nets:

They found the neuston they were looking for, plus a lot of other living things, and bits of floating non-living things:  wood, rock, rope and plastic.  The wood, the rope (probably polypropylene, which floats) and the plastic are expected….but not the rock. 

The highest numbers of both neuston and plastics bits was found in a single sample taken in a slick:  “Within our study, a patchy distribution of neuston and plastic at the surface may be due to small-scale (sub-mesoscale) surface dynamics like slicks, and may be important for neuston predation and reproduction. We found the highest concentration of both neuston and plastic in a slick (SJR_019), and this is true for other studies as well.”

Most of the material visible is the floating lifeforms, neuston.  There is a bit of plastic rope in Panel b and a few obvious chips of plastic.   One unfortunate thing in the study, for which Dr. Helm apologised, is that the photos of the trawl samples contain no ruler or scale that allows us to judge size.  The paper itself does not have detailed tables of object counts, nor does the supplemental.   In Fig 4a we see that the density of neuston and plastic bits per meter2 align very nicely. 

Bottom Line:

A nice little piece of work that supports the original hypothesis that the Pacific gyres should be concentrating all floating objects, not just plastics, but especially the lifeforms collectively known as neuston:   “neuston and plastic both appear to be concentrated by similar physical forces. Surface features like slicks that further concentrate neuston, may be important for neuston life history, and we found evidence that neustonic animals are reproducing in the NPGP”.

# # # # #

Author’s Comment:

This is an example of a good effort by researchers receiving recognition – but for the wrong reasons.  I suppose the NY Times covered it because it contains the words “Garbage Patch” and not because it is an interesting hypothesis confirmed by a neat bit of research. 

Dr. Rebecca Helm was kind enough to answer my questions and send me the supplemental file.

I admit to a long-time fascination with “By-the-wind sailors” – little jellyfish-like animal, a hydrozoa, with their little stiff sails that cause the wind to push them along on the surface of the sea.  I have only spent half a lifetime at sea, while they spend their entire lives sailing along….. However, I have never seen a live by-the-wind-sailor on the high seas despite many thousands of miles sailing less than four feet above the surface of the ocean, only dead ones on the shore.    

I have seen many odd lifeforms feeding at the sea surface, especially at night, and have seen the things that feed on them as well, including the rare Greater Bulldog Bat (or Fisherman Bat).

As for the rock . . . . . Early in our Caribbean adventure, I found a rugby ball shaped and sized piece of floating pumice rock, well rounded by washing onto and off of beaches, which traveled with us, and, wrapped in a rope net,  was used as a marker buoy on occasion.   It was returned to the sea, in the middle of the Gulf Stream, first being etched with our boat name and dates, on our last voyage home.  If you find it, let me know.

Thanks for reading.

# # # # #

4.9 19 votes
Article Rating
47 Comments
Oldest
Newest Most Voted
Inline Feedbacks
View all comments
H B
May 21, 2022 6:21 pm

Floating rock = pumice

Bloke down the pub
Reply to  H B
May 22, 2022 4:46 am

Many types of thermalite blocks will also float and once ground down are not readily distinguishable from pumice.

Randle Dewees
Reply to  H B
May 22, 2022 5:46 am

But just for a little while until water soaks into it, as I found out as a kid throwing bits of pumice into a lake.

H B
May 21, 2022 6:23 pm

As expected this garbage patch is a myth and people where raising money to harvest this

Scissor
Reply to  H B
May 22, 2022 4:13 am

Neuston, we have a problem.

markl
May 21, 2022 6:49 pm

I have seen Velella in the Pacific off the coast of Mexico, B.C. while fishing and some have washed up by my house in SoCal. Small, pretty, other worldly. The “garbage patch” is another exaggeration to gain support for environmentalist causes. Evidently what damage people do to the environment isn’t enough to sway opinions about how nasty people are so they make stuff up.

Reply to  markl
May 21, 2022 7:42 pm

They wash up on the beach in my neighborhood all the time. I just grabbed this photo off the local facebook group.

83212456_1797256983742620_183472640583794688_n.jpg
Gordon A. Dressler
Reply to  Charles Rotter
May 21, 2022 11:30 pm

Charles,

Those definitely look like Portuguese man-o-war floating jellyfish (photo c in the article’s Figure 1), not Velella.

As you undoubtedly know, you NEVER want to step on washed up man-o-war (or get close to them when swimming in water) because their stings are excruciatingly painful.

Been there, done that.

dennisambler
Reply to  markl
May 22, 2022 9:57 am

We get them on beaches off South West Wales UK.

Dave Fair
May 21, 2022 6:54 pm

Thanks for the information, Kip. Life will out.

Sweet Old Bob
May 21, 2022 6:56 pm

https://askinglot.com/what-are-neustons

Live and learn ! Neat stuff .

Walter Sobchak
May 21, 2022 9:03 pm

What are the chances that the plastic is feeding the organisms in the gyre?

Gordon A. Dressler
Reply to  Walter Sobchak
May 21, 2022 11:39 pm

Most likely bacteria are breaking down and feeding on those plastics that are biodegradable—admitting that breakdown may also be greatly enhanced in parallel by solar UV radiation—and it is the higher-order lifeforms (such as neustonic organisms) that, in turn, feed on the thriving, plentiful bacteria.

.KcTaz
May 22, 2022 12:47 am

This article and the one written some time ago, (See Below) is why I love WUWT. Such a wide range of topics and realistic, accurate reporting and editorializing, along with (mostly) knowledgeable, erudite and, often funny commenters is why I return to this site almost daily.
Thank you, Anthony and many thanks to your entire team for all you do and your hard work in bringing truth and light to the world on so many important issues.
Are we really “choking the ocean with plastic”? Tracing the creation of an eco-myth
https://bit.ly/2w8dNyz
 2015

H. D. Hoese
May 22, 2022 2:23 am

Everybody walking the central Texas beaches knows about this community. In a study of surface drifters it was found that unlike the eastern Gulf, “…western [without Mexico] areas received drifters from everywhere.” Lugo-Fernández, A., M. V. Morin, C. C. Ebesmeyer and C. F. Marshall. 2001. Gulf of Mexico historic (1955-1987) surface drifter data analysis. Journal of Coastal Research. 17(1):1-16.

This includes logs, sargassum, pumice (from Mexico rivers), light bulbs and back when the Japanese were fishing the Gulf glass floats from their nets. I have two softball size.

They did get the surface water strider, Halobates, but not the man-o-war fish living in the tentacles, Nomeus, goose-neck barnacles, Lepas and others (Unknown crustacean, Unknown gelatinous organisms, actually fairly well known). There are a number of papers on the communities, don’t have to simulate it.

“The presence of unnoticed neuston seas not only has implications for regional ecology and ecosystem services but possibly for international policy and biodiversity protection.” No problem, when we go back to sailing ships, they avoid them. It is a fascinating place, far from unnoticed.

Hans Erren
May 22, 2022 2:39 am

Pumice Rock: On 9 April 2021, La Soufrière volcano erupted explosively for the first time in over 40 years, sending an ash plume 10km into the sky.

yirgach
May 22, 2022 8:05 am

This time of the year we see just hatched baby spiders sailing by on the breeze.
Wheee!

jphilde
May 22, 2022 8:20 am

“What also floats in water? Very small rocks! She’s a witch!!”

J.R.
May 22, 2022 10:08 am

If oceanic and atmospheric science were conducted calmly and without political aims, I believe we would learn many fascinating and useful things. Alas, I fear this is mostly a pipe dream.

Danley Wolfe
May 22, 2022 10:25 am

Good post as usual from Kip Hansen. Far better than the other 10 I or so posts I deleted this Sunday, May 22.

Doonman
May 22, 2022 10:29 am

To quote NOAA: ” The name “Pacific Garbage Patch” has led many to believe that this area is a large and continuous patch of easily visible marine debris items such as bottles and other litter—akin to a literal island of trash that should be visible with satellite or aerial photographs. This is not the case.

The garbage patch was discovered in 1997 by a yachtsman named Charles Moore, who sailed through the enormous conglomerate of plastic debris.

Both explanations can’t be true.

Dave Fair
Reply to  Kip Hansen
May 22, 2022 12:03 pm

Kip, please see the quote from Moore, below. What he is said to have reported may have (as is often the case for environmental reporting) been exaggerated to get attention for the reporter.

Dave Fair
Reply to  Doonman
May 22, 2022 11:57 am

Doonman, you really do need to pause before hitting that Enter key. The following is from an interview of Charles Moore in the magazine of Earth Island Journal:

The discovery for me was not so much “Well, I’m in a garbage patch.” It wasn’t like an island of trash like people keep wanting to say. It’s just that I couldn’t survey the surface of the ocean for any period of time while standing on deck without seeing some anthropogenic debris, something that was human in origin, float by. Not necessarily a large something, but just something.”

H. D. Hoese
May 22, 2022 2:33 pm

“Within our study, a patchy distribution of neuston and plastic at the surface may be due to small-scale (sub-mesoscale) surface dynamics like slicks, and may be important for neuston predation and reproduction. We found the highest concentration of both neuston and plastic in a slick (SJR_019), and this is true for other studies as well.”

To there credit as they noted these localized surface features and their 3-D connections need to be studied in the ocean proper! The two S’s– Simulations and Satellites don’t help much. but observations like this do—-Woodcock, A. H. 1944. A theory of surface water motion deduced from the wind-induced motion of the Physalia. J. Mar. Res. 3:196-205. .

peterg
May 22, 2022 3:55 pm

Interesting that wood is defined as “inorganic”

Loren C. Wilson
May 22, 2022 8:03 pm

Throw out the right-most point in graph a and you don’t have a trend at all. Kind of like Mann’s hockey stick disappearing when one tree is removed. A real trend can survive losing a data point. I would like to see more data before drawing any firm conclusions.

Gordon A. Dressler
Reply to  Kip Hansen
May 23, 2022 7:54 am

Kip,

I get your point, but with the “two outliers omitted” (your words in your above comment) the linear curve fit equation would change and the R^2adj value would almost certainly not remain at 0.85.

I think you just cropped the last figure in your article, but did not redo the least-squares curve fitting to the data set without the “outlier” data points.

%d bloggers like this: