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LIFE AQUATIC WALRUSES Clockwise from upper left: Although they are slow and awkward on land, walruses are nimble and surprisingly fast in the water. Diminishing sea ice in the Arctic presents survival challenges to both walruses and polar bears. Polar bears require the rich meat and blubber of marine mammals; they prefer to prey on seals but will hunt walruses if no seals are available. Polar bears are adaptable and opportunistic, traits that will be useful to them as the Arctic warms. Walrus haulouts are like swarms in slow motion. The animals are gregarious by nature and spend prolonged periods in their large colonies in quiet stillness until suddenly chaos breaks out, usually caused by one walrus trying to shift position and in doing so jostling others nearby. There is a lot of grunting and bellowing, a little tusk jabbing and lots of blubber slapping. Then after a short while everything settles down again until the next chaos. Some individuals are very curious. We did not expect the walruses to be so inquisitive, and we were surprised when they swam toward us in shallow water without warning. Being charged by a wild animal weighing nearly a ton is a memorable experience. Each individual seemed to have its own personality; some were so shy we were unable to approach and take pictures. Although walruses are clumsy and slow moving on land, they undergo an astonishing transformation in the water, becoming dynamic and graceful. Like all Arctic animals, their ability to adapt to a changing environment will be important in the years ahead. AD 42 | WINTER 2018
RESEARCH EDUCATION MEDICINE Large, intact staghorn corals are plentiful on the far northern Great Barrier Reef. STEPHEN FRINK 44 DAN WAS THERE FOR ME / 46 ADVANCED DIVING / 50 RESEARCHER PROFILE 56 FROM THE MEDICAL LINE / 60 SAFETY 101 / 62 SKILLS IN ACTION 64 INCIDENT INSIGHT / 66 RISK MITIGATION ALERTDIVER.COM | 43
Page 1 and 2: THE MAGAZINE OF DIVERS ALERT NETWOR
Page 3 and 4: D I V I N G A N D T R A V E L A D V
Page 5 and 6: DIVE CONFIDENTLY. ALWAYS HAVE DAN W
Page 7 and 8: LET THE BEAUTY OF THE CAYMAN ISLAND
Page 9 and 10: MADE IN THE USA THE WETSUIT FOR AME
Page 11 and 12: “AS THE DAN ANNUAL DIVING REPORT
Page 13 and 14: genres. For example, the winning en
Page 15 and 16: ALEX ROSE by providing guidelines t
Page 17 and 18: A yellowfin tuna cruises a kelp pad
Page 19 and 20: tuna are the same fish that were po
Page 21 and 22: For 59 out of these celebrated 60 y
Page 23 and 24: est diving in Oregon, with perfect
Page 25 and 26: and posture, which indicate its gen
Page 27 and 28: Get to the bottom of all this. With
Page 29 and 30: Buoyed by the success of the MRDF,
Page 31 and 32: PUBLIC SAFETY ANNOUNCEMENT OXYGEN U
Page 33 and 34: * Currently available to active and
Page 35 and 36: Sharpnose puffer, Canthigaster rost
Page 37 and 38: ASSISTED PULL-UPS The assisted pull
Page 39 and 40: Clockwise from top left: The visito
Page 41 and 42: New Cuba Travel Program Summer Intr
Page 43: thick hide was used for leather, an
Page 47 and 48: STEPHEN FRINK DAVID DELBIONDO DAVID
Page 49 and 50: Florida Keys National Marine Sanctu
Page 51 and 52: the target of much of this work oft
Page 53 and 54: BE A CHAMPION OF SAFETY. BECOME A D
Page 55 and 56: therapy applications. Our understan
Page 57 and 58: two-dimensional flow information wi
Page 59 and 60: safety. In a 2006 study of 420 wome
Page 61 and 62: outpouchings of the lungs; these ar
Page 63 and 64: Imagine you are at your next dive d
Page 65 and 66: JESSEA LU John Hullverson was walki
Page 67 and 68: She was diving alone, but about 16
Page 69 and 70: WHEN AN INJURY HAPPENS, YOU MAY HAV
Page 71 and 72: Lockhart River is a very sparsely p
Page 73 and 74: From far left: At the base of Light
Page 75 and 76: polyps, and I want to see and recor
Page 77 and 78: Papua New Guinea Papua New Guinea g
Page 79 and 80: Painted sea anemones (Urticina cras
Page 81 and 82: attached to railings and clusters o
Page 83 and 84: Candy-striped shrimp (Lebbeus grand
Page 85 and 86: yet, as they amount to only 4 perce
Page 87 and 88: put coral sperm and eggs in deep fr
Page 89 and 90: Diving with Diabetes GUIDELINES AND
Page 91 and 92: “Before diving, people with diabe
Page 93 and 94: ANDY SALLMON HARBOR SEAL TUG AND TA
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PYGMY PAIRING Though my passion is
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INTO THE LIGHT The amazing cavern s
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GUITARFISH This image is a perfect
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JELLYFISH WITH GOLDEN TREVALLY On a
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Rim lighting can create a dramatic
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Observing small sponges and sea squ
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From top: Oceana works to oppose th
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Nonrebreather mask Bag valve mask W
Page 111 and 112:
MARKETPLACE ADVERTISERS INDEX Q1 Wi
Page 113 and 114:
TRAVEL BOLDLY. WITH NEW TRAVEL COVE
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