Hurricane Sandy's Aftermath: Will Rats Take Over Manhattan?


Wikimedia Commons

"The 8-million-strong human population of New York City is matched, if not exceeded, by the city's number of rodent dwellers," says Lynne Peeples at The Huffington Post. And lots more rats lost their homes — subway tunnels and sewers — to flooding from Hurricane Sandy than people did. What has become of those disease-carrying vermin?

"Rats are incredibly good swimmers," says Rick Ostfeld of the Cary Institute of Ecosystem Studies, ominously. "And they can climb." If Sandy did indeed flood them out and upset their social structure, "rats could start infesting areas they never did before," and the result could be a public health mess, with potential outbreaks of leptospirosis, typhus, salmonella, even the plague. In other words, "a rat disturbance is something we should be concerned about."

Well, so far at least, the "ratpocalypse that threatened to destroy humanity (at least in New York)" hasn't materializedsays Dan Amira at New York. There's been no notably increased above-ground presence of the rodents, and "in fact, the flood may end up as a net positive, as far as we people are concerned." Why? Flooding kills young rats, so the overall rat population may well decrease.

Unfortunately, it's not that simple, says Adam Clark Estes at Vice. Many, if not most, rats will drown, but "those that make it out of the flooding will be treated to a veritable feast of garbage and debris that washed into the tunnels during the hurricane," and they'll be able to gorge and reproduce freely in the deserted subway stations. And if the flooding killed the submissive rats that scavenge for food in the daytime, leaving the dominant, nocturnal rats alive, "New York's rat population may have just gotten stronger."

This fixation on a great rat invasion makes sense after a calamity like Sandy, says Robert Sullivan at The New Republic. "We find rats terrifying, a measure of the breakdown of everything we think of when we think of civilization." But it's important to remember that "rats rarely live up to headline writers' fantasies." Let's start by debunking the myths: First, there aren't 8 million rats in New York; there are more like 250,000. Second, "hordes of Norway rats, North America's predominant rat species, do not live deep in the subway tunnels," they live where the food/garbage is — on the subway platform and in parks:

After September 11, rat populations increased in Lower Manhattan precisely because the area was cut off to people. Restaurants near the old World Trade Center that were abandoned were suddenly akin to rat farms... The Lower Manhattan rat population increased dramatically, and, as a result, the city Department of Health built a ring of poison-filled bait stations around the abandoned areas, eventually beating down the population explosion. This week's flooding just means... Keep your food secure and be vigilant.... And we know that after a flood event, the water itself — contaminated with raw sewage, as well as petroleum products and all the not-as-terrifying pollutants that normally cover our streets — is potentially more of an issue in terms of spreading pathogens than rats.

nextArticle.image_alt|e
Days Inn
arrow
technology
Days Inn's New LED Umbrella Makes Gloomy Days Sunnier
Days Inn
Days Inn

Taking a walk outside is a quick way to feel better—unless it's raining. If you're someone who loves sunshine and clear skies, you may use gloomy weather as an excuse to lock yourself indoors for the whole day. A new type of umbrella from Days Inn may prompt you to reconsider. The hotel chain's Days InnBrella uses built-in LED strips to provide you with a personal patch of light even on the dreariest days.

The new product takes the umbrella's timelessly practical design one step further. As the fabric keeps you dry, the interior lights each generate 4000 LUX (a unit used to measure the amount of light striking a surface). It's no replacement for bright sunlight, but its glow should hopefully give you the mood boost you need the next time you're walking in the rain.

Woman with illuminated umbrella.
Days Inn

If you're over 18 and have a Twitter account, you're eligible to win a free Days InnBrella of your own. Just retweet this tweet from Days Inn before June 26 to enter the contest. The five winners will be selected on June 27.

Days Inn isn't the first brand to give the classic umbrella an upgrade. KAZbrella stays drip-free by closing inside-out, and Oombrella gives weather forecasts and alerts you when you leave it behind.

nextArticle.image_alt|e
iStock
arrow
Weather Watch
Why Does the Sky Look Green Before a Tornado?
iStock
iStock

A common bit of folklore from tornado-prone parts of the U.S. says that when the skies start taking on an emerald hue, it's time to run inside. But why do tornadoes tend to spawn green skies in the first place? As SciShow's Michael Aranda explains, the answer has to do with the way water droplets reflect the colors of the light spectrum.

During the day, the sky is usually blue because the shorter, bluer end of the light spectrum bounces off air molecules better than than redder, longer-wavelength light. Conditions change during the sunset (and sunrise), when sunlight has to travel through more air, and when storms are forming, which means there are more water droplets around.

Tornadoes forming later in the day, around sunset, do a great job of reflecting the green part of the light spectrum that's usually hidden in a sunset because of the water droplets in the clouds, which bounce green light into our eyes. But that doesn't necessarily mean a twister is coming—it could just mean a lot of rain is in the forecast. Either way, heading inside is probably a good idea.

For the full details on how water and light conspire to turn the sky green before a storm, check out the SciShow video below.

SECTIONS

arrow
LIVE SMARTER
More from mental floss studios