Today (June 16) is World Sea Turtle Day – a day used to honor and highlight the importance of sea turtles. These wonderful creatures are at risk due to various human activity, including the presence of artificial lights.
Now for those in the astronomy scene we value the dark night sky in order for us to appreciate the wonders of the universe. But known to little is the threat of light pollution on these endangered creatures. Female sea turtles look for dark coastal areas to nest their eggs and to keep them protected. The presence of coastal lights prevent them from finding suitable nests for their eggs. Sometimes coastal lighting casts shadows on some areas that to the turtles may seem dark and suitable, but is actually exposed come daylight.
Sea turtle hatchlings also have a natural programming that direct them towards the safety of the sea. For centuries the reflection of the moon and stars on the sea have guided them. With the presence of artificial coastal lighting today, they are disoriented and crawl away from the water and into roads or populated regions where they end up ran over or sold as pets (which is illegal for endangered species). Others who don't find their way become exhausted and dehydrated until they perish.
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| Gamay, a Hawksbill turtle rehabilitated in the Silliman University Marine Lab and released in the Apo Island Marine Sanctuary. |
Among the critically endangered sea turtle species are the hawksbill sea turtle (Eretmochelys imbricat) who have been reported to lay eggs in the populated and highly commercialized island of Boracay. We have four other species
of sea turtles inhabiting the Philippine waters - Loggerhead (Caretta
caretta;
endangered), green sea turtle (Chelonia
mydas;
endangered), leatherback sea turtle (Dermochelys
coriacea;
critically endangered), and the Olive ridley sea turtle (Lepidochelys
olivacea;
vulnerable).
Sea turtles are only part of a large number of species of animals affected by artificial light at night. So let's help protect these species by avoiding the use of excessive and unshielded lighting. In doing so, you also allow astronomers, stargazers, and astronomy enthusiasts a better view of the sky. All these animals are affected - and you and I are among them.
If you are interested to help monitor the levels of light pollution in the Philippines, you can join us at the Philippine Light Map project.
