Test your knowledge: What am I?

I am a bivalve that grows in the Atlantic Ocean. I do have several species closely related to me that live in freshwater. I am very closely related to clams and oysters. I tend to grow to about 4 inches long. I live in colonies and attach to bulkheads, rope and rocks very easily. To do this I use a sticky protein, called byssus, that forms tough yellow fibers that harden in salt water. My inside is often pearly iridescent and my outside is a blueish black color. I use my gills to filter water to get food and oxygen which  I need to survive. I am very tasty steamed with garlic and butter.

Here are some pictures of me:

Images (c) top: maggiesfarm.anotherdotcom.com, middle and bottom: Beach Chair Scientist.

Where have all the horseshoe crabs gone?

If you’ve kept on eye on the sandy shores of the Atlantic Ocean or eastern Gulf of Mexico over the past twenty years you’ve noticed a significant decline in the number of horseshoe crabs, Limulus polyphemus, covering the beach. As a marine educator and naturalist in my past life, I always said the decline was due to over harvesting for bait and pharmaceutical needs. This is only half the reason. Recently scientists also noted that climate change, with the sea level rise and temperature fluctuation, may be a cause of the decline.

Tim King, a scientist with the United States Geological  Survey, thinks that what happened during the Ice Age could happen again. With climate change comes a loss of habitat and a loss of diversity. These issues could have severe implications, not only for horseshoe crabs, but also for species that rely on them for sustenance. For instance, along the Delaware Bay the red knot eats the horseshoe crabs eggs at the midpoint of their migration. In the Chesapeake Bay, loggerhead sea turtles are struggling to find one of their favorite food sources, horseshoe crabs, and are retreating elsewhere to find food. Now that the link of a decline in the horseshoe crab population and climate change has been made fisheries managers can take this into consideration.

Images (c) Greg Breese, US Fish and Wildlife Service

Understand marine debris ASAP

Oh no! It is that moment when I am finally relaxed and settled into my chair at the edge of the water and I look up from my book to see a plastic wrapper whizzing into the sea. I take a look around and do not see anyone running to grab it so I get up and run for the trash. Now don’t get me wrong, I understand that trash falls out of our hands from time to time. That is why I am one of those people that tend to make the extra effort to do the right thing and pick up after someone else, I hope someone would do the same for me. Basically, I have an active imagination. I see the future of this plastic bag as having a relaxing trip to the open sea where it floats on the bright and sunny surface only to be mistaken for a nutritious and delicious jelly by a leatherback sea turtle. Only it gets lodged in the turtle’s throat. It turns out to potentially suffocate the animal and may lead to his eventual death. Yes, that is where my imagination takes me … Unfortunately it is all too much a reality. Watch this clip of an Ecuadorean team of scientists trying to save this green sea turtle who was too weak to survive since his gut was full of plastic.

This plastic bag and other man made trash items that sea creatures commonly mistake for food are collectively known as marine debris. Items may include plastic bags, cigarette butts, fishing gear, bottles, cans, caps, lids, you name it … it is marine debris. The marine debris doesn’t just come from pieces that fly out of our hands while at the beach. The trash that ends up in our ocean can come from drains and sewers on our street. The ocean is the largest body of water and a part of the world wide watershed.

One of the most alarming illustrations of how much marine debris has ended up in our ocean ecosystem is the presence of the Pacific Garbage Patch. In the northern Pacific Ocean (in between Hawaii and San Francisco) there is an island of marine debris larger than the size of Texas that is held together by a centrifugal force of the ocean current known as the North Pacific Gyre. You cannot see this patch from a satellite image because it is simply suspended particles of shoes, toys, plastics bags, wrappers, tooth brushes and many bottles.

Marine debris is everywhere and is quite a nuisance for life in the oceans. In the summer when we are all enjoying a few relaxing days on the beach or on the boat let’s do our part and “leave only footprints and take only pictures”, ok?

ADDITIONAL RESOURCES:

Learn more about marine debris from the short video by the Algalita Marine Research Foundation.

Also, here is an excellent example of what is being done to acknowledge the issue of marine debris and taking the effort to help eliminate it. Thanks, New Hampshire!

Here is a nice site that outlines what you can do to reduce your plastic footprint.

Image (c) wildeducation.org (leatherback sea turtle) and coffeencrafts.blogspot.com (trash)

A Few Lines from Rehoboth Beach by Fleda Brown

Dear friend, you were right: the smell of fish and foam
and algae makes one green smell together. It clears
my head. It empties me enough to fit down in my own

skin for a while, singleminded as a surfer. The first
day here, there was nobody, from one distance
to the other. Rain rose from the waves like steam,

dark lifted off the dark. All I could think of
were hymns, all I knew the words to: the oldest
motions tuning up in me. There was a horseshoe crab

shell, a translucent egg sack, a log of a tired jetty,
and another, and another. I walked miles, holding
my suffering deeply and courteously, as if I were holding

a package for somebody else who would come back
like sunlight. In the morning, the boardwalk opened
wide and white with sun, gulls on one leg in the slicks.

Cold waves, cold air, and people out in heavy coats,
arm in arm along the sheen of waves. A single boy
in shorts rode his skimboard out thigh-high, making

intricate moves across the March ice-water. I thought
he must be painfully cold, but, I hear you say, he had
all the world emptied, to practice his smooth stand.

Read more about this author here.

Just Flip ‘Em

If you do not already know, the Atlantic horseshoe crab is my favorite animal. It just breaks my heart when I am home and see a few crabs stranded along the wrackline. One thing that can be done for the animals that are still alive is to ‘Just Flip ‘Em’ (JFE).

JFE is a program from the Ecological Research & Development Group, Inc. that promotes to the public the importance of flipping the gentle crustacean over so they can get back into the sea. A lot of folks are hesitant but the horseshoe crab cannot sting or bite you. The most important piece or information to remember is to flip them from the sides of their shells. This simple act can save thousands of crabs.

Image (c) horseshoecrab.org

Take a guess! What do you think this lobsta weighs?

Image (c) Massachusetts Division of Marine Fisheries.

Do you have another good question for the Beach Chair Scientist? Go to http://www.beachchairscientist.com and let us know. Or you can e-mail your question to info@beachchairscientist.com.

Can we eat sea cucumbers?

There’s a funny animal that lives on the floor of the ocean and likes to eat what most of us would only wipe off the bottom of our shoes. It’s name is the sea cucumber. The sea cucumber is an echinoderm and is closely related to sea stars, sea urchins, and sand dollars.To protect itself the sea cucumber will expel its intestines outside of its body to distract predators. The sea cucumber is a prized Japanese culinary tradition used often in soups and stews. Fisheries along the Atlantic coast have been popping up in the past twenty years to sell sea cucumbers.

Check out this video from National Geographic on how they (literally) fight with guts for glory:

Do you have another great question? Simply email me at info@beachchairscientist.com.

Can a sea star see?

Not in the traditional sense that you and eye see, I mean, you and I see.

Sea stars (Sidenote: since they are not ‘fish’ sea stars, as opposed to starfish, is more appropriate) have an eyespot at the tip of each “leg”. These eyespots can distinguish between light and dark and other stimuli and the sea star is able to react to what they sense.

Do you have another good question for the Beach Chair Scientist? Go to http://www.beachchairscientist.com and let us know. Or you can e-mail your question to info@beachchairscientist.com.

Ninja-like crustacean

Excerpt from the Blue Planet.

Do you have a question for the Beach Chair Scientist? e-mail info@beachchairscientist.com.

Answers to “Test your knowledge of sea stars”

Answers to “Test your knowledge of sea stars” from December 31, 2009.

True or False: Sea stars are fish. They are echinoderms, a group of invertebrates. Invertebrates have no backbones. All fish have backbones.
True or False: Sea stars are closely related to sea cucumbers, sea urchins and brittle stars.
True or False: Sea stars have a flexible skeleton.
True or False: Sea stars breathe through gills. They breathe through a water vascular system. You can see the tube feet (a main component of the water vascular system) on the underside of the sea stars.
True or False: Sea stars can regenerate most body parts.

Congrats to all those that got them correct!