El caso de la catastrófica pérdida del kelp

Por Melissa Gaskill.

Q2 2021

For more than five years, divers and scientists along the U.S. West Coast have watched a disaster play out before their eyes. Sunflower sea stars fell victim to a wasting disease, which wiped out roughly 90 percent of the global population in 2013. Seven years later, scientists see no signs of recovery. Without the sea stars, the population of purple urchins that sea stars eat has exploded and mowed down entire forests of bull kelp. The West Coast experienced intense ocean warming from 2014 to 2017, and by 2015 divers began seeing urchin barrens — vast swaths covered in piles of spiny creatures and little else.

Looking Into the Lungs

Por Frauke Tillmans, Ph.D.

Q2 2021

During medical school Peter Lindholm joined a laboratory researching aviation, space and underwater physiology, where he developed a passion for breath-hold dive physiology, about which he wrote his doctoral thesis. As one of the physicians for the Swedish Sports Diving Federation (SSDF), he was involved in developing breath-hold dive protocols and training the first instructors of competitive breath-hold diving. After clinical training as a radiologist, Lindholm moved to San Diego, California, where he leads a research group focused on dive physiology and dive medicine.

La migración del calamar de California

Texto y fotos de Richard Herrmann.

Q2 2021

Al descender en el agua tan oscura como la noche, miles de calamares pulsantes en busca de pareja aparecen repentinamente por todas partes. Hay actividad de apareamiento por doquier ya que varios machos atacan a la misma hembra. Los cromatóforos (células pigmentarias) de los calamares excitados proyectan colores que recuerdan a las luces de neón de Las Vegas y colocan al espectador en el medio de un espectáculo de luces vivientes y móviles. La acción es tan desenfrenada que los animales están sobre el equipo del buzo y rebotan contra cada centímetro de su cuerpo.

Conozca los riesgos

Por Ivan Yue, Alexander Li, Vivek Abraham y Jasmine Scott

Q2 2021

Nitrogen narcosis can lead to deadly consequences. Understanding the risk factors and ensuring that you and your dive buddies have discussed how to mitigate risk can potentially save lives. If you are stung by a jellyfish, watch for symptoms associated with Irukandji syndrome. If symptoms develop, know that it is a potentially deadly condition that doctors can help treat. Pay attention to local marine life bulletins and announcements. The best ways to mitigate jellyfish envenomation risk are to wear full exposure suits and avoid jellyfish when they are prevalent in the water.

Protección de manos

Por Frauke Tillmans, Ph.D.

Q2 2021

Gloves are one of the most overlooked and individualized pieces of dive equipment. When choosing gloves, consider the kind of diving you plan to do and what you expect from your hand protection. When selecting gloves, consider the following factors: thermal protection, fit, dexterity, hazard protection, impact resistance and materials.

EPOC: incompatible con el buceo

Q2 2021

Reduced exercise tolerance is common for those with chronic obstructive pulmonary disease and poses risks for diving. There can be strenuous activity involved with managing currents, swimming on the surface in choppy seas or pulling yourself and your heavy gear up a ladder and onto an unsteady boat. With COPD, shortness of breath during exertion doesn’t mean you are out of shape; it means you cannot rid your body of carbon dioxide and replace it with the oxygen needed to meet the demand of your exertion.

Simbiosis en la arena

Texto y fotos de Ned y Anna DeLoach

Q2 2021

Interactions between different species, whether above or below water, typically revolve around confrontations between predators and prey. At the opposite and more harmonious end of the spectrum, a scattering of unrelated species coevolved to form lifelong alliances for their mutual security. These relatively rare go-along-to-get-along partnerships provide a net benefit for both parties, improving each species’ reproductive success. The close living arrangement between weak-eyed alpheid snapping shrimp and sharp-eyed partner gobies is a classic example of symbiosis in the sea.

Ejercitarse después de un descanso

By Jessica B. Adams, Ph.D., and Jaime B. Adams, M.S., C.S.C.S.

Q2 2021

A veces la vida se complica —por obligaciones familiares, lesiones imprevistas, responsabilidades laborales o eventos sociales— o quizás el mundo que conocemos deja de funcionar por un tiempo. Cuando estas cosas nos abruman, muchas personas tienden a sacrificar el ejercicio primero. Es posible que se pierda algunos entrenamientos y luego su rutina de ejercicios lentamente pasa de ser regular a inexistente. Esto le sucede a la mayoría de las personas —incluso a expertos en aptitud física y atletas profesionales— en algún momento de sus vidas. Si bien puede ser un desafío, reanudar su rutina de ejercicios es posible.

La inspiración de Aw

Fotos y leyendas de Michael Aw; texto de Stephen Frink.

Q2 2021

Michael Aw’s early life while growing up in Singapore — he didn’t see the ocean until age 17 — gave few clues that he would one day become one of the most influential print journalists in destination diving and ocean conservation. The author of or major contributor to 43 books, Aw created Ocean Geographic magazine in 2007 and also leads expeditions, often to exotic regions. He now hopes to raise awareness of the folly of shark-finning and the overexploitation of our marine resources.