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190. Hiding in the sand



Subject:

Many marine animals have evolved the remarkable ability to hide in the sand for various reasons. The use of sand as a hiding place for aquatic animals is a remarkable adaptation that serves various purposes, including camouflage, protection, ambush hunting, temperature regulation, shelter, and minimising the effects of water currents. It is a testament to the incredible diversity of strategies that organisms have developed to survive and thrive in their aquatic habitats.


Here's an explanation of why this behaviour is so common:


Camouflage:

Sand provides excellent natural camouflage for marine animals. Their colour and textures often match the surroundings, making it easier for them to blend in and remain undetected by predators or prey. By burying themselves in the sand, these animals become virtually invisible, allowing them to surprise their targets or avoid becoming one themselves.

Protection from Predators: Hiding in the sand offers a protective shield against potential predators. When buried, these animals can minimise their exposure and reduce the chances of being detected or attacked. By using their environment as a defensive strategy, they increase their chances of survival.


Ambush Hunting:

Many predatory aquatic animals, such as certain species of fish and crustaceans, employ ambush hunting techniques. They bury themselves in the sand, leaving only their eyes or antennae exposed. From this concealed position, they wait patiently for unsuspecting prey to swim by, at which point they launch a swift attack. This strategy allows them to conserve energy and increase their chances of successful hunting.


Temperature Regulation:

Sand can act as an insulating layer, helping to regulate the body temperature of certain aquatic organisms. Some species may bury themselves during extreme temperatures, whether it is to escape excessive heat or to seek refuge from cold waters. By using the sand as a thermal buffer, these animals can maintain their optimal body temperature and ensure their physiological processes continue to function efficiently.


Shelter and Breeding Grounds:

Sand provides a secure environment for many aquatic animals to seek shelter or establish breeding grounds. Some species, such as certain types of fish or crustaceans, construct burrows in the sand where they can retreat from threats, lay eggs, or protect their young. The sand offers a stable and secluded space that helps ensure the survival of their offspring and provides a safe haven when needed.


Minimising Water Currents:

Marine animals living in fast-moving water bodies often utilise the sand as a means to minimise the impact of strong water currents. By burrowing or partially burying themselves, they can reduce the force of the water against their bodies and conserve energy that would otherwise be expended on staying in place. This adaptation allows them to navigate their environment more efficiently and avoid being swept away.


Technique:

For most scuba divers, underwater photographers, and videographers, the sandy areas underwater are nothing more than boring wastelands with little to no marine life present, a desolate and uninteresting desert. Consequently, these areas are generally avoided during dives. However, to experienced underwater filmmakers and scuba divers alike, the sand holds a treasure trove of beautiful, weird, and interesting marine wildlife. The challenge lies in how to discover these hidden gems and what to look out for. Detecting marine wildlife in these regions requires the ability to identify anything that doesn't conform to the landscape: a bump, peculiar tracks, small holes, or small piles of sand and cobbles.


Filming in a sandy area is also much easier compared to filming on a coral reef. Firstly, there is no risk of breaking or damaging corals and sponges. Secondly, you can effortlessly lie down and position your large underwater housing and rig in a stable manner by resting them on the substrate. This technique ensures stable footage.


Filming location:

This short underwater videoclip has been filmed in Mauritius 🇲🇺


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