Thursday, July 4, 2013

Sun compass orientation helps coral reef fish larvae return to their natal reef

 Location of One tree Island.
One Tree reef (OTI, 23°30′S, 152°06′E) is one of fourteen reefs in the Capricorn Bunker Group in the southern Great Barrier Reef, Australia.
OTI is situated 90 km from the Queensland coast and 5–10 km southeast of neighboring reefs Heron and Sykes.

From Plosone

Reef fish sustain populations on isolated reefs and show genetic diversity between nearby reefs even though larvae of many species are swept away from the natal site during pelagic dispersal.
Retention or recruitment to natal reefs requires orientation capabilities that enable larvae to find their way.

 >>> geolocalization with the Marine GeoGarage <<<

Although olfactory and acoustically based orientation has been implicated in homing when larvae are in the reef’s vicinity, it is still unclear how they cope with greater distances.
Here we show evidence for a sun compass mechanism that can bring the larvae to the vicinity of their natal reef.

 Model illustrating how a time-compensated sun compass could help passively drifted reef fish larvae to relocate their natal OTI reef.
Red dots indicate the locations at ebb tide of passively dispersed particles 8 days after release from One Tree Reef according to the dispersal experiments and model calculations
At flood tide the dots will be displaced 5–7 km WNW. 
Notice that most larvae considered as passive particles for their first 8 days would be transported significantly to the NNW beyond the odor halo of OTI (idealized odor halos in decreasing intensity blue) and even beyond neighboring reefs to the NNW before they gain sustained swimming capabilities. 
The polar diagram shows the time-compensated sun compass orientation of just-settled (•) and pre-settlement (o) larvae
One-week old O. doederleini larvae (symbolized by the dispersed cloud of red dots) would be more likely to relocate the OTI reef if they used a sun compass to swim actively toward SSE, than if they would swim in random directions.

In a circular arena, pre-settlement larvae and early settlers (Ostorhinchus doederleini), showed a strong SSE directional swimming response, which most likely has evolved to compensate for the locally prevailing large scale NNW current drift.

When fish were clock-shifted 6 hours, they changed their orientation by ca. 180° as predicted by the tropical sun curve at One Tree Island, i.e. they used a time-compensated sun compass.
Furthermore, the fish oriented most consistently at times of the day when the sun azimuth is easy to determine.


Microsatellite markers showed that the larvae that had just arrived at One Tree Island genetically belonged to either the local reef population or to Fitzroy Reef located 12 kilometers to the SSE.
The use of a sun compass adds a missing long-distance link to the hierarchy of other sensory abilities that can direct larvae to the region of origin, including their natal reef.
Predominant local recruitment, in turn, can contribute to genetic isolation and potential speciation.

Wednesday, July 3, 2013

World nautical maps : a new layer from NGA catalogue

>>> geolocalization with the Marine GeoGarage <<<

NGA charts are offered for viewing as an additional service for all the countries which don't directly produce nautical charts.

As charts produced by NGA may contain information from other than United States Government sources, copyright restrictions from the country of origin continue to exist in NGA chart content.
(All Rights Reserved).
"The NGA charts are based on "source" data provided by foreign hydrographic offices and therefore these data are subject to foreign copyright as is shown within the "Source Diagrams" on each of the NGA nautical charts."

Today, the Marine GeoGarage got the official authorizations from the different national authorities for the publication of NGA nautical maps for the following countries :

  • Haïti,
  • Honduras,
  • Antigua/Barbuda,
  • Belize,
  • Anguilla BVI,
  • Guinea,
  • Gambia,
  • Tanzania
Maps displayed today :
  • 21521    Golfo de Fonseca
  • 21529    Bahia de La Union and Approaches
  • 21530    La Union
  • 25570    Approach to Antigua
  • 25575    Northern Antigua
  • 25575A    Saint John's Harbour
  • 25608E    Plans of the Leeward Islands E.Approach to Barbuda
  • 25613    Approaches to Anguilla
  • 26141    Canal de la Tortue
  • 26141A    Port de Paix
  • 26141B    Rade de la Basse Terre
  • 26142    Approaches to Cap-Haitien and Bahia de Monte Cristi
  • 26143    Bahia de Monte Cristi (Dominican Republic)
  • 26145A    Manzanillo
  • 26145B    Fort Liberte and Manzanillo Plans: A. Manzanillo
  • 26145C    Baie Sud-Est
  • 26146    Cap-Haitien
  • 26147A    Plans in Haiti : Mole Saint-Nicolas
  • 26147B    Plans in Haiti : Anse d'Hainault
  • 26147C    Plans in Haiti : Jérémie
  • 26147D    Plans in Haiti : Port de Cap-Haïtien
  • 26148    Baie de l'Acul and Approaches (Haiti)
  • 26181    Golfe de la Gonave
  • 26182    Gonaives
  • 26184    Approach to Port-au-Prince
  • 26186    Port-au-Prince (Haiti)
  • 26187    Baie de Saint-Marc
  • 26188A    Plans in the Golfe de la Gonave : Saint-Marc
  • 26188B    Plans in the Golfe de la Gonave : Miragoâne
  • 26188C    Plans in the Golfe de la Gonave : Lafiteau
  • 26188D    Plans in the Golfe de la Gonave : Petit Goâve
  • 26203    Pointe I'Abacou to Baie d'Aquin
  • 26203A    Cayes
  • 26206A    Aquin and Jacmel (Haiti-South Coast) Plan : Aquin
  • 26207    Jacmel
  • 26210    Navassa Island to Cabo Beata
  • 26210A    Navassa Island to Cap Tiburon
  • 28103    Cayos Vivorillo, Becerro and Caratasca
  • 28103A    Cayos Becerro
  • 28103B    Cayos Vivorillo
  • 28125    Isla de Guanaja (Caribbean Sea-Honduras)
  • 28140    Northern Reaches to Cabo Gracias a Dios
  • 28142    Puerto Castilla
  • 28143    Isla de Utila (Honduras)
  • 28143A    Bancos Salmedina
  • 28150A    Barra de Caratasca to Tela Panels : Cabo Farallones to Tela
  • 28150B    Barra de Caratasca to Cabo Farallones
  • 28150C    Islas Santanilla
  • 28151    Approaches to Puerto Castilla
  • 28153    Coxen Hole and French Harbor
  • 28153A    French Harbor
  • 28154    Approaches to La Ceiba
  • 28161    Tela Harbor
  • 28167    Ambergris Cay to Pelican Cays
  • 28170    Approaches to Puerto Cortes (Gulf of Honduras)
  • 28171    Approaches to Puerto de Tela (Gulf of Honduras)
  • 51160    Cabo de Sao Vicente to the Strait of Gibraltar
  • 51562    River Gambia Entrance
  • 51562A    Banjul
  • 51600    Cap Verga to Cape Sierra Leone (West Coast of Africa)
  • 61190    Dar Es Salaam to Mchinga Bay
  • 61191A    Dar es Salaam harbor
  • 61191B    Dar es Salaam and Adjoining Anchorages
  • 61200    Dar es Salaam to Mombasa Harbor
  • 61203    Approaches to Zanzibar (Zanzibar Island)
  • 61204    Zanzibar Harbor (Zanzibar Island) 
Other contacts are made with other countries for future publications in the Marine GeoGarage platform. 


Dar Es Salaam (from BA sources 1974)
>>> geolocalization with the Marine GeoGarage <<<


Some NGA charts use old survey materials and are not regularly updated 
(NOT corrected for Notice to Mariners).
So use these charts as a ready reference or in situational awareness or as a planning tool.

All NGA charts and maps are for reference purpose only.
NOT FOR NAVIGATION

These charts are for countries where no locally produced RNCs exist.
NGA charts are quite a bit out of date (15 - 30 years) - not even updated for their own NOTAMs.
But they can be used for a general area coverage and passage planning or "armchair sailing" at home.


For more information about NGA products, visit the NGA website.
To report any NGA chart discrepancies, please send an email to MCDPubs@nga.mil

Note : some NGA charts for North America, Western Africa, Mediterranean, Black Sea, Eastern Asia, South Eastern Russia, Philippines remain also available for viewing on the NOAA website.

Microbes make cozy homes in ocean 'Plastiphere'


Plastics in oceans: more damaging than climate change ?
The United Nations estimates that each one of us uses nearly 140 kilograms of plastic each year.
At least 6.4 million metric tons of that plastic has ended up in the oceans.


For about four decades, it's been known that plastic is collecting in the open ocean.
Now, scientists have found this debris harbors unique communities of microbes, and the tiny residents of this so-called plastisphere may help break down the marine garbage.
Inhabitants of the plastisphere include members of a group of bacteria, the vibrios, known to cause disease, and microbes known to break down the hydrocarbon bonds within plastics, genetic analysis revealed.
But most important, the communities of microbes on the plastic pieces were quite different from those found in samples of surrounding seawater.
"It's not a piece of fly paper out there with things just sticking to it randomly," said study researcher Tracy Mincer, an associate scientist at the Woods Hole Oceanographic Institution, referring to the plastic.
"There are specific groups of microbes that are attracted to that environment and are adhering to it and living on it."


Potential pathogens & plastic degraders

Vibrios accounted for nearly 24 percent of the residents on one of the six small pieces of plastic used in the study.
"Because most plastic originates from land it begs the question how far these vibrios are coming from. … And are they potential pathogens, not just of humans, but for animals, such as fish," said study researcher Linda Amaral-Zettler, an associate scientist at the Marine Biological Laboratory.
Some species in the genus Vibrio cause disease, but it’s not clear what species were within the samples, since the analysis for this study did not identify individual species of bacteria.

Burrowed in

Meanwhile, microscope images revealed microbestucked into pits that conformed to the shape of their single-celled bodies.
The pits suggest the microbes are perforating the plastic and accelerating the natural weathering process, breaking it down, Mincer said.
(The researchers aren’t certain which bacteria are in the pits; most bacteria cannot be identified through microscope images.)
"Either the cells have to settle into the perfectly shaped pits or they have something to do with creating the pits," said study researcher Erik Zettler, associate dean and professor of oceanography at the Sea Education Association in Woods Hole, Mass.
If the microbes are indeed burrowing into the plastic, they may be doing so mechanically or they could be metabolizing, otherwise known as "eating," the plastic, Zettler said.
The presence of hydrocarbon-degrading bacteria, related to those that bloomed after the Deep Horizon oil spill, indicates that bacteria may indeed be responsible for the pits.


Good or bad for ocean life?

The scientists aren't sure if bacteria-aided breakdown of plastics is good or bad for ocean ecosystems.
Whereas smaller pieces may accelerate the removal of plastics from the oceans, they may also have negative consequences.
Smaller trash bits have a larger surface area (and more contact with the surrounding water) relative to volume so they can release more of the pollutants that plastics can absorb.
These itsy bits of plastic are also morelikely to enter the bottom of food chains when animals such as tiny, floating creatures called zooplankton consume them, and accumulate in the predators at the top, Zettler said.
Much of the plastic debris in the ocean has been broken down into confetti-size pieces.
During voyages in the North Atlantic, researchers and students onboard a Sea Education vessel collected bits of plastic for this study, which was published online by the journal Environmental Science & Technology on June 7.
This research is part of a National Science Foundation-funded project to study microbes living on marine plastic.
Going forward, Mincer is interested in finding the genetic mechanism that has enabled the plastic colonizers to attach to it so quickly and effectively.
"We think it may lead to a story of microbes adapting to a changing world," he said, pointing out that plastics are quite different from any surface upon which open ocean microbes would naturally settle.

Links :
  • Discovery :  Disease-bearing Invaders Cruise on Ocean Trash
  • Bigelow Lab for Ocean Sciences : Resourceful Microbes Reign in World’s Oceans
  • TheScientist : An ocean of viruses
  • GeoGarage blog : Trash in the deep sea: bringing a hidden problem to light
  • e360 : No refuge: tons of trash covers the remote shores of Alaska

    Tuesday, July 2, 2013

    Antarctic islands named after hydrographers


    There’s a lot to discover and the hydrographic surveyors are contributing to exploration and mapping of the underwater world.


    The UK Antarctic Placenames Committee has named islands in the British Antarctic Territory after well-known hydrographic surveyors active in the IHO, like Willett Island, Gorziglia Island and Lambert Island.


    Also Taunton, hometown of the UKHO, has been honoured with an island being named after it.
    Other islands are during the last half year named after Bath and Cricklewood, towns with UKHO history, Queen Elizabeth II – and other sources like Lynx (referring to the helicopters) and for example Neville Mann, a south pole surveyor.

    For the full list and explanations, please see the UK Antarctic Placenames Committee’s website.


    The following names have been added in the last 6 months:

    Astra Peak    -67.9510 -67.1753
    >>> geolocalization with the Marine GeoGarage <<< 
    Peak 851 m in height 3 km east of Camp Point, north-west of McMorrin Glacier on the Fallières Coast.
    Named after the second part of the RAF’s motto, per ardua ad astra (meaning ‘To the stars’), as part of a regional naming theme of British Forces.
    In association with RAF Flight Lieutenant Ron Lord, who made an exceptional flight in 1959 from Deception Island to Horseshoe Island to relieve the over-wintering BAS staff, when heavy sea-ice conditions in Marguerite Bay prevented relief by ship (APC, 2013).    29-04-2013

    Bath Island    -62.3810 -59.7898
    >>> geolocalization with the Marine GeoGarage <<<  
    One of the Aitcho Islands, north of Emeline Island, English Strait, South Shetland Islands.
    Named in association with the local theme of hydrography, after the city of Bath in Somerset, England, where sections of the UKHO were temporarily located during World War II.    14-03-2013

    Cricklewood Island    -62.3846 -59.7744
     >>> geolocalization with the Marine GeoGarage <<<
    One of the Aitcho Islands, north of Emeline Island, south-west of Jorge Island, English Strait, South Shetland Islands.
    Named in association with the local theme of hydrography, after Cricklewood, the district of London where the main part of the UKHO was located until 1968.    14-03-2013

    Diamond, Mount    -67.8226 -66.7517
     >>> geolocalization with the Marine GeoGarage <<<
    Prominent pyramid peak 1198 m in height, east of Square Bay, between Forbes and Swithinbank Glaciers on the Fallières Coast.
    The peak was first climbed by the British Services Antarctic Expedition 2012, and named in honour of Her Majesty Queen Elizabeth the Second’s Diamond Jubilee year (APC, 2013).    29-04-2013

    Expedition, Mount    -67.4996 -66.7806
    >>> geolocalization with the Marine GeoGarage <<< 
    Prominent peak 955 m in height west of Liboutry Glacier, north-east of Blaiklock Island on the Fallières Coast.
    Named as part of the regional naming theme for British Forces, after the British Services Antarctic Expedition 2012 (APC, 2013).    29-04-2013

    Gorziglia Island    -62.3963 -59.7762
     >>> geolocalization with the Marine GeoGarage <<< 
    One of the Aitcho Islands, south-east of Emeline Island, English Strait, South Shetland Islands. Named in association with the local theme of hydrography, after Captain Hugo Gorziglia who chaired the IHO’s Hydrographic Commission on Antarctica (2002-2012).    14-03-2013

    Lambert Island    -62.3711 -59.7638
     >>> geolocalization with the Marine GeoGarage <<<  
    One of the Aitcho Islands, west of Fort William, English Strait, South Shetland Islands.
    Named in association with the local theme of hydrography, after Rear Admiral Nick Lambert, National Hydrographer (2010-2012) and Commanding Officer of HMS Endurance (2005-2007).    14-03-2013

    Lynx Peak    -64.2262 -60.8477
      >>> geolocalization with the Marine GeoGarage <<<  
    Prominent triangular peak, 1063 m in height, on the south side of Sikorsky Glacier, east of Charles Point, Danco Coast.
    Named in association with the theme of pioneers of aviation in this area, after the Westland Lynx helicopters that aided Antarctic logistics from the Royal Navy ice patrol vessel HMS Endurance (1987-2008).    21-03-2013

    Mann Ice Stream    -76.8157 -30.2503
     >>> geolocalization with the Marine GeoGarage <<<  
    Ice stream flowing west into the Weddell Sea on the Luitpold Coast.
    Named in commemoration of Neville Mann (1940-1963), who worked for BAS as a surveyor out of Halley Bay 1962-1963.
    He died in 1963 whilst on a dog training exercise on sea ice, during a storm (APC, 2013).    29-04-2013

    Mosley Ice Stream    -77.3596 -33.2321
     >>> geolocalization with the Marine GeoGarage <<<  
    Ice stream flowing north-west into the Weddell Sea on the Luitpold Coast.
    Named in commemoration of Miles Mosley (1946-1980), who worked as a BAS General Assistant (GA) at Stonington Island 1970-1973 and Base Commander at Halley 1977-1980).
    Mosley died at Halley in 1980 (APC, 2013).    29-04-2013

    Pegasus Peak    -67.4489 -66.7990
     >>> geolocalization with the Marine GeoGarage <<<   
    Isolated peak 1491 m in height between Liboutry and Heim Glaciers on the Fallières Coast.
    Named after the symbol of the Parachute Regiment, as part of the regional naming theme for British Forces (APC, 2013).    29-04-2013

    Stancomb-Wills Glacier Tongue    -74.7830 -22.3830
    >>> geolocalization with the Marine GeoGarage <<<
    The floating part of the NW extension into BAT of Stancomb-Willsstraumen, Dronning Maud Land, flowing into the Weddell Sea between Brunt Ice Shelf and Riiser-Larsen Ice Shelf, W of Lyddan Ice Rise, Caird Coast.
    The floating glacier tongue of this feature was roughly charted by BITAE, 15 January 1915, and named Stancomb Wills Promontory after Miss (later Dame) Janet Stancomb-Wills (d. 1932), a prime supporter of the expedition, after whom one of the Endurance's boats was also named. Stancomb-Wills Shelf Ice (AGS map, [1929c]).
    Stancomb-Wills Ice Tongue (USAF chart 1806, 1947).
    Following the voyage of the Argentine icebreaker General San Martín along this coast in January 1955, it was reported that the glacier tongue had calved along the line of Brunt Ice Front (Thomas, 1957c, p.354).
    In January 1956, TAE reported a concentration of icebergs in the area where the seaward part of the floating glacier tongue of this feature had disintegrated.
    Stancomb(e)(-)Wills Ice Promontory (USHO, 1956, p.79; Fuchs and Hillary, 1958e, p.24).
    Stancomb-Wills Glacier Tongue, referring to the seaward, mainly floating part of the feature in 75°00'S 22°00'W (AGS map, 1970; Alberts, 1977, p.47).
    Stancomb-Wills Glacier Tongue, referring to the floating part in BAT, W of 20°00'W (APC, 2013).    29-04-2013

    Stanhope Towers    -67.6998 -66.7073
    >>> geolocalization with the Marine GeoGarage <<< 
    Adjacent peaks at the head of Dogs Leg Fjord, south of Butcher Glacier on the Fallières Coast.
    Named after Admiral Sir Mark Stanhope (b. 1952), former First Sea Lord and supporter of Antarctic activities, as part of the regional naming theme for British Forces (APC, 2013).    29-04-2013

    Taunton Island    -62.3841 -59.7821
    >>> geolocalization with the Marine GeoGarage <<<  
    One of the Aitcho Islands, north of Emeline Island, English Strait, South Shetland Islands.
    Named in association with the local theme of hydrography, after the county town of Taunton in Somerset, England, where the UKHO printing works has been located since 1941 and where the remainder of the Office moved in 1968.    14-03-2013

    Westminster Peninsula    -67.7525 -66.8750
     >>> geolocalization with the Marine GeoGarage <<<
    Peninsula of land between Dogs Leg Fjord and Square Bay on the Fallières Coast.
    Named after the Major General the Duke of Westminster for his role as Deputy Commander of the Army Reserves and supporter of Antarctic activities, as part of the regional naming theme for British Forces (APC, 2013).    29-04-2013

    Willett Island    -62.3838 -59.7643
    >>> geolocalization with the Marine GeoGarage <<<
    One of the Aitcho Islands, south of Jorge Island, English Strait, South Shetland Islands.
    Named in association with the local theme of hydrography, after Mr Andrew Willett, cartographer with the UKHO who led the IHO’s Hydrographic Commission on Antarctica’s Survey Prioritisation working group for 10 years.

    Taunton, home of UKHO, has been honoured with an Antarctic namesake () here on Google Maps

    Monday, July 1, 2013

    Journeys of discovery from Cortez to Cayman


    In 1940 Steinbeck sailed in a sardine boat with his great friend the marine biologist, Ed Ricketts,
    to collect marine invertebrates from the beaches of the Gulf of California.
    The expedition was described by the two men in Sea of Cortez, published in 1941.
    In these phosphorescent waters, they sought an understanding of mankinds relationship to the natural world,
    and hope for a world headed toward war.

    From BBC

    An overloaded sardine boat set sail from Monterey in California in 1940 on a journey remarkable not for its ambition but for the place it would earn in the literature of marine discovery.

    The book describing the expedition, "The Log from the Sea of Cortez", was a masterpiece - charming, perceptive and honest about the reality of scientific fieldwork.
    And it remains highly relevant today.

    Many of its observations - by the writer John Steinbeck and his friend Ed Ricketts, a biologist - were to ring true on my visit to a British research vessel, the James Cook, in the Caribbean earlier this year.
    Steinbeck would later become one of America's most famous authors for Grapes of Wrath, his searing account of families fleeing the Oklahoma dust bowl for a new life in California.

    But back in 1940 he had the time to join Ricketts on an expedition with a very modest aim: investigating the worms, crabs and clams inhabiting the tidal zone of the Mexican shore.

     The Western Flyer took Steinbeck (R) and Ricketts on their journey
    “There is an idea boat that is an emotion, and because the emotion is so strong it is probable that no other tool is made with so much honesty as a boat”
    John Steinbeck “The Log from the Sea of Cortez”

    'Horizonless'

    Their account not only conveys the hardships, triumphs and humour of attempting research at sea but it also highlights the power of science to support a basic human motivation: curiosity.
    "We wanted to see everything our eyes could accommodate," Steinbeck and Ricketts wrote, "with a view as wide and horizonless as that of Darwin…"

     >>> geolocalization with the Marine GeoGarage <<<
    “We had all felt the pattern of the Gulf, and we and the Gulf had stablished another pattern which was a new thing composed of it and us”
    John Steinbeck

    So they ventured into the Gulf of California in the same spirit as the scientists on board the James Cook who were exploring the almost alien hydrothermal vents in an underwater canyon known as the Cayman Trough.

    On the face of it, the two voyages had very little in common.
    One involved an ultra-modern science vessel brimming with high technology while the other was "makeshift", as Steinbeck and Ricketts themselves admitted.

    As a hired fishing boat, the Western Flyer that carried them had no laboratory.
    The microscopes, along with some of the chemicals, had to be stored on the bunks.

    A wooden case holding important reference books and charts - essential for the research effort - turned out to be too large to be stored anywhere except the roof of the deckhouse where it was lashed under tarpaulins which made it virtually inaccessible.
    "We had no dark-room, no permanent aquaria, no tanks for keeping animals alive, no pumps for delivering fresh sea water. We had not even a desk except the galley table."

    The one small fridge, intended to cool seawater to help keep samples alive, ended up being used less for science and more to chill the beer.

    As a result, Steinbeck and Ricketts concluded that "all collecting trips to fairly unknown regions should be made twice; once to make mistakes and once to correct them".

    The day-to-day story of the trip is told here in the Log, which combines science, philosophy and high-spirited adventure.
    An exhilarating and highly entertaining read.
    (Google Books)

    'Peephole'

    By contrast the James Cook, run by the UK's National Oceanography Centre, was built for research. It is a floating campus with professors and students busy with instruments and computers in suites of labs.
    And the ship also provides something unimaginable to earlier generations of marine scientist: a remotely-operated submarine that glides above the seabed and relays back live video, even from three miles deep.

    The sights can be spellbinding.
    But I soon found that the expeditions, though poles apart in terms of capability, shared something fundamental: a passion for discovery and understanding.

    Isla Espíritu Santo
    “The sea here swarms with life, and probably the ocean bed is equally rich. Microscopically, the water is crowded with Plankton. This is the tuna water –life water. It is complete from Plankton to gray porpoises… Everything ate everything else with a furious exuberance”.
    John Steinbeck “The Log from the Sea of Cortez”

    Steinbeck had once written about the value of exploration.
    "Every new eye applied to the peephole which looks out at the world may fish in some new beauty and some new pattern…"

    For him and Ricketts, the peephole involved the hard graft of waiting for low tide so they could clamber through the mud to observe and collect along the shore. Braving stings and cuts, they relished moments of revelation about new creatures and the workings of "teeming, boisterous life".

    They were thrilled to realise the potency of what they were studying: "life in every form is incipiently everywhere waiting for a chance to take root…"

    So they would have instantly recognised the buzz that electrified the James Cook at a key moment. The ISIS, the robot submarine, reaching the seabed, provided the ultimate 'peep-hole' with high-definition video showing twisted, belching hydrothermal vents that no human eye had ever seen before.

    The tiny control room where the "pilots" controlled the sub was suddenly packed.
    Crewmen, engineers and scientists all strained for a view of an unearthly realm.
    We were all amazed by swarms of albino shrimp jostling on the rocks.
    Who wouldn't be?
    Discovery is irresistible.

    The tiny shrimp fight for the best positions from which to feed on bacteria in an exceptionally narrow zone where the temperature and chemistry are just right: between the scalding vent water and the icier water of the surrounding sea.

    The animals Steinbeck and Ricketts collected also depended on a very specific set of conditions in a similarly narrow zone, in their case found in the mud and rock between the reach of the high and low tides.

    They - and the scientists on the James Cook - were trying to understand how life works in such tightly defined areas and how some forms of life can thrive where others wouldn't cope.

    Returning to Monterey with a hold-full of samples, Steinbeck and Ricketts came up with a memorable conclusion about the resilience of living things: "Let a raindrop fall," they wrote, "and it is crowded with the waiting life."

     Cabo San Lucas
    “It would be good to live in a perpetual state of leave-taking, never to go nor to stay, but to remain suspended in that golden emotion of love and longing; to be loved without satiety.”
    John Steinbeck, The Log from the Sea of Cortez

    'Open-minded'

    The James Cook too returned laden with samples - shrimp and tube-worms, rocks and gases - crossing the Atlantic to reach the National Oceanography Centre at Southampton in March.

    As always after fieldwork, months of analysis were to lie ahead, and expedition leader Dr Jon Copley and his colleagues hope their turn at the "peep-hole" will have allowed them to detect not just "new beauty" but also a "new pattern".

    Not surprisingly, Dr Copley is such a fan of Sea of Cortez that he recommends it to his first year undergraduates.
    "So much is so recognisable to our kind of fieldwork," he said.
    "The book is a real insight into what it's like to do science at sea."
    "It's about making a journey into the unknown, trying to work out what's going on while hopefully remaining open-minded - and I adore it."

    The Sea of Cortez tells Jon Copley - and his fellow scientists and students - that the science is never complete and that "an answer is invariably the parent of a great family of new questions".

    Links :
    • BBC : the Sea of Cortez 
    • NOAA : The Western Flyer: A Sunken Piece of Literary History Is Raised from the Depths
    • Sea of Cortez : a cruiser's guidebook