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Unusual Encounters: Sea Turtles Roaming Off Los Angeles

A sea turtle swimming off Los Angeles, California: (Photograph by Maddalena Bearzi, Ocean Conservation Society)
A sea turtle swimming off Los Angeles, California: (Photograph by Maddalena Bearzi, Ocean Conservation Society)

“Balloon straight ahead” one of my researchers tells the captain while leaning forward from the bow of our boat. We are so accustomed to find plastic debris during our dolphin surveys off Los Angeles, California, that a party balloon is the first thing that comes to everyone’s mind when we come across something round-shaped floating just below the ocean surface. We are still a couple of miles offshore, heading back to port after a long day recording data and taking pictures of two species of common dolphins, bottlenose dolphins, Minke whales and sea lions and the ocean is getting choppy. It’s time to go home.

Suddenly, our alleged balloon raises its head out of the water.

“Twelve o’clock, twenty meters. It’s a sea turtle, it’s a sea turtle!” yells another of my assistants as she lowers her binoculars and starts waving her hands to get our attention. It’s a sea turtle indeed: an endangered green turtle.

As the marine reptile slowly swims just below the surface, we parallel the animal to take a peek. The turtle lifts its head for a breath of air and we are all speechless.

In almost two decades of regular year-around monitoring of marine mammals in Santa Monica Bay we have never seen a single sea turtle! I’d heard that there were some rare sightings in the past and sea turtles have been found stranded along California shores, especially south of our study area, but in thousands of hours spent doing research inside the bay… no turtles. So, why now?

This species has been regularly seen near the mouth of the San Gabriel River, one of the main watersheds of the Los Angeles Basin. In this highly industrialized area, a colony of green turtles have found “home” thanks to the unusually warm temperature of the water. Making the water particularly cozy for these animals are two large industrial electric power plants located near the rivers’ outlet. This lukewarm artificial habitat resembles, in a way, the more temperate-tropical waters in which these animals usually live. Walking along the bike path, one can observe green turtles as small as a dinner plate or as large as 4-feet in length. Not too many Los Angelinos are aware that these ancient-looking marine reptiles live year-round in this area, but some people come armed with binoculars for a turtle-watching day; a good alternative to the usual bird-watching.

This is their Northern-most colony. The majority of sea turtles, in fact, start to appear along San Diego shores and become more abundant as one goes south. Santa Monica Bay, with its relatively cold waters, hasn’t ever been a great location for green turtles to roam… except perhaps in this last month.

According to a recent report by the National Oceanic and Atmospheric Administration, the first six months of 2014 were the hottest ever in California, and ocean temperatures are currently going through a “remarkable” warming period. To many scientists this looks a lot like the beginning of an El Niño weather pattern even if there is still ongoing debate on this topic. Others believe the warming might be related to climate change. Whatever the reason might be, the warmer waters of the bay are having an effect on the distribution of different creatures living in the oceans, like sea turtles. In my study area off Los Angeles, this green turtle has not been the only recent odd encounter. Lately, our Ocean Conservation Society research team and other scientists along this stretch of California coast have recorded sightings of species not usually observed here. By-the-wind sailor jellyfish, sea nettles, sunfish, and subtropical fish are showing up with increased frequency.

Every time we go out for a research day at sea, we now seem to meet up with something unusual. What will come next?

Maddalena Bearzi has studied the ecology and conservation of marine mammals for over twenty-five years. She is President and Co-founder of the Ocean Conservation Society, and Co-author of Beautiful Minds: The Parallel Lives of Great Apes and Dolphins (Harvard University Press, 2008; paperback 2010). She also works as a photo-journalist and blogger for several publications. Her most recent book is Dolphin Confidential: Confessions of a Field Biologist (Chicago University Press, 2012).

 

Comments

  1. Barbara on Maui
    December 11, 2014, 2:47 am

    Enjoyed reading about your green sea turtle encounter. I see
    them frequently from my lanai. Many of our visitors swim
    with them in the bay. Right now we are sighting whales …. ” ’tis
    the season” ! Aloha, Barbara

  2. jonathan gonzalez
    United States
    September 9, 2014, 7:25 pm

    @TIRN How dare you take credit for the driftnet closure. NMFS closed it because they were monitoring the situation for months and felt it was necessary. Your threat to sue had no influence on NMFS whatsoever. So why not tell the truth? Oh yeah, I forgot. You have to keep those donations coming in somehow, right?

  3. Turtle Island Restoration Network
    September 6, 2014, 12:26 pm

    Thankfully Turtle Island Restoration Network, SeaTurtles.Org, was able to get the California driftnet closure to protect sea turtles. Great blog! bit.ly/1AfZrBu

  4. Shirley Friday
    United States
    September 5, 2014, 5:50 pm

    Maddalena, your important work is intense, challenging, possibly sometimes frustrating, but, OMG, what surprising, amazing sights you encounter! These new discoveries must add to the excitement of your already incredible work with the dolphins and increase your drive to educate the masses and protect these wonderful sea creatures. I am, as always, totally in awe of what you and Charlie do with your lives. I try to follow your posts but I’m not always on Facebook, and not very good at it, but but when I do, I always look for your posts. My warmest regards. Shirley