I’m McKensie Daugherty, your host for on the ocean. Did you know the ocean has many natural oil seeps? Oil is constantly being released from the sediments into the water column in the world’s oceans. This oil is normally taken care of naturally by bacteria, so other organisms living there are not harmed. The trouble with oil in the ocean occurs when oil is introduced into the ocean by human impacts (such as oil spills, and runoff from stormwater systems). On April 20th, 2010 the Deepwater Horizon drilling rig experienced an explosion that engulfed the platform, killing 11 and injuring 16 people. This explosion led to the drill rig sinking, as well as a long-term leak of oil and gas from the well. This leak at 1500 meters depth presented a problem, in that it was technically extremely difficult to attempt to cap the well. Because this leak was so deep, several attempts to cap it failed, so that the leakage of crude oil into the water column of the Gulf of Mexico continued for 3 months. In total, the well leaked 700,000 tons of oil and a quarter of a million tons of methane into the ocean, and the surface slicks that resulted coated 626 miles of coastline with crude oil and an oil/water emulsion called mousse. The spill closed most of the northern Gulf of Mexico to fishing, and was so serious that the national guard was called out to help. Overall, this and other oil spills can be incredibly detrimental to ocean life. This month we will go into why oil spills are deleterious, how to help clean them, and what researchers at Texas A&M are doing to understand these events better. This has been On the Ocean, a program made possible by the Department of Oceanography and a production of KAMU-FM on the campus of Texas A&M University in College Station. For more information and links, please go to ocean.tamu.edu and click On the Ocean.
I’m McKensie Daugherty, your host for On the Ocean. Sea turtles are fascinating reptiles, with many behaviors to try and understand to help with their conservation. Researchers at Texas A&M University use satellite trackers and isotope analyses to understand and track sea turtles to better understand where they nest and feed, so that these beaches and feeding areas can be protected. Olive Ridley sea turtles display two distinct types of nesting: solitary and Arribada. Solitary nesting occurs when females nest seemingly at random, in different places, and do it alone. Arribada nesting is an event where thousands of female sea turtles gather offshore until an unknown trigger signals them to swim to shore and nest all together, in the same area at the same time. Using satellite trackers, researchers proved they leave in different directions, meaning this is not considered a social migratory behavior. Using these trackers, researchers also see the travelling range and feeding areas of the sea turtles. Conveniently, Olive Ridleys often sunbathe at the surface of the ocean, meaning the satellite tracker is able to communicate on a consistent basis, and scientists can get more data. Most interestingly, they see that female Olive Ridley’s switch from Solitary to Arribada behaviors and vice-versa seemingly at random. As a result, researchers are using stable isotope analysis (using Carbon to Nitrogen ratios) to discover where these sea turtles are eating. They hypothesize the trigger in switching behaviors could be a change in the feeding behavior of the turtles. By tracking their behavior, scientists hope to discover what drives these processes. This has been On the Ocean, a program made possible by the Department of Oceanography and a production of KAMU-FM on the campus of Texas A&M University in College Station. For more information and links, please go to ocean.tamu.edu and click On the Ocean.
I’m McKensie Daugherty, your host for On the Ocean. One of the most dangerous threats to sea turtles is the overwhelming existence of plastics in the open ocean. In fact, there is an area in the Pacific Ocean named the Great Pacific Garbage Patch, in which an area of floating garbage covers surface area larger than the state of Texas. Sea turtles live in this area, and other areas where floating plastics are prevalent. Today, more than 80% of deceased turtles found and examined have plastic inside their stomach. This can range from plastic bags, bottle tops, ropes, and tags to straws, lids and anything that a turtle can possibly eat. Single use plastics are an enormous problem for sea turtles, and for oceanic waste collection. Things like plastic straws and cups are easily ingested by sea turtles, and can even be caught on them elsewhere, like in their nostrils or wrapped around their shells or appendages. This plastic is not just being dumped directly into the ocean, it is coming indirectly from waterways from all over the nation. Why are these sea turtles ingesting plastic and other nonfood objects? Scientists hypothesize that this is because sea turtles have never encountered objects floating in the ocean that they cannot eat, until the addition of plastics became as large a problem as it is today. To help ocean cleanup and sea turtles, communities recycle as much and as often as possible to not only reuse items, but keep them from reaching the open ocean. Single use plastics like lids, bags, and straws can be replaced by multi use products (for example, bringing reusable bags to the grocery store), which can help reduce plastic one piece and one person at a time. This has been On the Ocean, a program made possible by the Department of Oceanography and a production of KAMU-FM on the campus of Texas A&M University in College Station. For more information and links, please go to ocean.tamu.edu and click On the Ocean.
I’m McKensie Daugherty, your host for On the Ocean. Conservation of sea turtles has been the mission of many organizations for decades. The United States and Mexico have collaborated in this endeavor for years. In the U.S., organizations such as Gladys Porter Zoo, NOAA, Texas Parks and Wildlife, National Park Service, Fish and Wildlife Service, and Texas SeaGrant, have collaborated for years in order to understand and remove these problems. Thanks to their hard work, the Texas Gulf of Mexico has seen vast improvement in sea turtle populations, especially for the Kemp’s Ridley species. Conservation efforts for sea turtles are multifaceted. Threats to sea turtles in the open ocean are concentrated to ingestion of plastics and accidental capture in the nets of the shrimping boats. These nets can trap and kill many turtles, and this reduced their population greatly. However, in 1990, the shrimp fisheries began employing a Turtle Excluder Device (called a TED) in nets that allow turtles to escape their fishing nets unharmed. This allowed growth of the sea turtle populations in the open ocean. The other side of turtle conservation is the focus on their reproduction and hatching happening on beaches. Beaches can be incredibly dangerous places for both mother and hatchling turtles. Predators, human poachers, and accidental destruction of nests can dramatically decrease turtle populations. Organizations spend time and funding to work on the protection of nests with unhatched eggs, as well as corralling these eggs. Eggs can also be collected and taken to incubators if need be, then released at the time of hatching. Conservation efforts are processes that take decades to work because of the long timing of turtle life and reproduction. Many organizations work together to help these animals, and the success of conservation efforts done in the 1960’s and 70’s are paying off today. This has been On the Ocean, a program made possible by the Department of Oceanography and a production of KAMU-FM on the campus of Texas A&M University in College Station. For more information and links, please go to ocean.tamu.edu and click On the Ocean.