Alligators in the Abyss

This story starts with my research team currently deploying alligators* (3 total, 2 – 2.5 meters in length) at three different sites 2000 meters deep in the Gulf of Mexico. The experiment is to examine the role of alligators in biodiversity and carbon cycling in the deep oceans.

Wait…what? What kind of mad science is this?

What you need to know is that the deep oceans, encompassing depths below 200 m, cover most of Earth and are especially food-deprived systems. Primary production of carbon is minimal only occurring through alternative pathways such as chemosynthesis. However, chemosynthesis is a tiny fraction of total ocean production (0.02–0.03%) and the energy that sustains most deep-sea organisms is sequestered in sinking particulate organic carbon derived from plankton hundreds of meters to kilometers above near the sea surface. At the abyssal seafloor, this sinking particulate organic carbon represents less than 1% of surface production.

Alligator fall on sonar

This minimal amount of carbon available opens the door for more unique sources of carbon. Enter food falls and aligators.

The initial deployment of the alligator fall

The remains of large plants, algae, and animals arrive as bulk parcels that create areas of intense food enrichment. Deep-sea scientists have explored these food falls through both naturally occurring and experimentally deployed wood (#woodfall) and plant remains, cameras baited with animal carcasses, chance occurrences of and deployed intact whale carcasses several miles deep on the seafloor. These experimental and natural food falls have revealed the important role they play in deep-sea diversity. Many of these large food falls on the deep-sea floor, host highly diverse and endemic suites of organisms in kind of food island. In addition, food falls may represent significant transport highways of carbon into the deep oceans. For example, during Typhoon Morakot, wood was estimated to carry a total of 4*1012 g of organic carbon into the oceans, nearly 25% of the total annual riverine discharge of organic carbon in the same region. On the deep-sea floor, a single wood fall can enrich sedimentary organic carbon by >25% even after several years.

But why alligators? With regard to animal falls, prior work as focused primarily on whales and other cetaceans, pinnipeds, large fish such as tuna, and elasmobranchs. However, it very likely that marine reptiles both currently, and even prehistorically, are an important source of carbon in the deep oceans. Before the existence of whales, perhaps large marine reptiles like ichthyosaurs, mosasaurs, and plesiosaurs hosted diverse and endemic invertebrate communities on sunken carcasses, similar to modern-day whale falls, and contributed significantly to the deep-sea carbon budget. From ichthyosaur and plesiosaur remains, there is evidence of molluscs that are also associated with Eocene seeps. A fossilized limpets are also found in close association with the bones of a fossil leatherback turtle from the Middle Eocene. In the modern oceans, carcasses of Alligator mississippiensis serve as the closest modern analog of ichthyosaur, mosasaur, plesiosaur food falls.

Alligator carcasses in the deep ocean are also not as nearly impossible as you might think.  Both live individuals and carcasses of alligators are frequent on beaches and in coastal surf.  A 3-meter individual came ashore at Folly Beach, South Carolina in 2014 and in 2016 a carcass of a 4-meter individual washed up on a beach in Galveston, Texas.  These individuals of A. mississippiensis may be easily carried offshore by major rivers or during large storm events, tropical storms, and hurricanes.  Live A. mississippiensis have been observed 30 kilometers offshore and after Hurricane Katrina in 2005, an alligator was found 25 kilometers offshore. During the 2011 Mississippi flood event, several dead alligators were observed in the mouth of Atchafalaya River.

Thus, I am on ship, 100’s of kilometers from shore, placing an alligator 2 kilometers deep on the seafloor.

Giant Isopods feast on the alligator fall less than 24 hours after deployment.

*The three alligators were culled by the state of Louisiana to control population numbers and in aid of restoration efforts. The alligator carcasses were then permitted to us for scientific use. The conservation and any taking of alligators in Louisiana is a very serious and thorough process. You can read more about the conservation success story that is alligators in Louisiana here https://t.co/LQskiPyg6e.

Dr. M (1795 Posts)

Craig McClain is the Executive Director of the Lousiana University Marine Consortium. He has conducted deep-sea research for 20 years and published over 50 papers in the area. He has participated in and led dozens of oceanographic expeditions taken him to the Antarctic and the most remote regions of the Pacific and Atlantic. Craig’s research focuses on how energy drives the biology of marine invertebrates from individuals to ecosystems, specifically, seeking to uncover how organisms are adapted to different levels of carbon availability, i.e. food, and how this determines the kinds and number of species in different parts of the oceans. Additionally, Craig is obsessed with the size of things. Sometimes this translated into actually scientific research. Craig’s research has been featured on National Public Radio, Discovery Channel, Fox News, National Geographic and ABC News. In addition to his scientific research, Craig also advocates the need for scientists to connect with the public and is the founder and chief editor of the acclaimed Deep-Sea News (http://deepseanews.com/), a popular ocean-themed blog that has won numerous awards. His writing has been featured in Cosmos, Science Illustrated, American Scientist, Wired, Mental Floss, and the Open Lab: The Best Science Writing on the Web.


One Reply to “Alligators in the Abyss”

  1. While it’s true gators have sometimes been spotted at sea and on marine coasts, you could also just point to them as analogs for the saltwater crocodile. They’re probably roughly nutritionally equivalent, and salties routinely not only move along coasts and between islands, but swim hundreds of miles across open ocean, and vagrants have turned up in Fiji, Iwo Jima, the Marshall Islands, the Maldives, and Japan. American crocs also seem comfy moving up and down the coasts, though they don’t have the reputation for long voyages like salties.

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