Sharks as a Keystone Species
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A Blacktip reef shark cruising the shallow reefs of a tropical lagoon. (Pollock/Marine Photobank) |
Sharks are considered to be
a keystone species of the ocean. This means their removal could result in the
collapse of the entire ecosystem (WildAid).
They keep their prey species in balance by preying on the weak and sick.
By targeting sick and weak
fish, they reduce the risk of diseases spreading across prey populations. They
also strengthen the overall gene pool of their prey (WildAid). By taking out the weak, they allow for only the stronger
fish to reproduce.
Sharks also serve as
enforcers to limit overgrazing on marine vegetation by their prey. It was
reported that sharks might actually “intimidate”
their prey into practicing healthier habits (WildAid). For example, it was discovered by scientists in Hawaii
that having tiger sharks in the area prevent green sea turtles from overgrazing
the healthiest marine vegetation habitats.
As a keystone species, the
extinction of sharks would throw off the entire food chain of the ocean. An
example of the impact caused by another keystone species going extinct can be
observed with wolf populations in Yellowstone. In the 1930’s people killed
nearly all wolves in the area. This allowed for Elk populations to exceed
Yellowstone’s carrying capacity and overgraze on vegetation (MyYellowstone). With less vegetation,
especially around waterways, it caused a domino effect on the ecosystem through
results of erosion into rivers and declining beaver populations.
How Humans Have Villainized Sharks
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Steven Spielberg's Jaws Released in 1975. (10 Things More Likely Than a Shark Attack) |
“Martin, it’s all psychological. You
yell, “Barracuda,” everybody says, “huh, what?” You yell “Shark,” we’ve
got a panic on our hands on the Fourth of July.” – Mayor Vaughn (Jaws, 1975).
It is important to remember
that the ocean is the sharks’ home and not ours. Have sharks attacked humans
before? Well, yes. In 2018, it was reported that 32 unprovoked shark attacks
happened in the United States with one being fatal (FisheriesBlog). However, if you think about how many people
actually go into the water annually, 32 people is not that many.
Statistically, the odds for
someone getting attacked and killed by a shark are 1 in 3,748,067 (The International Shark Attack File).
In fact, you are more likely to die from getting hit from an asteroid (1 in
75,000) or being injured by a toilet (96.4 in 100,000) than to get attacked by
a shark (FisheriesBlog).
However, we have amplified
these rare attacks to be more than what they really are through media. When
Steven Spielberg’s Jaws was released
in 1975, it changed the way sharks were portrayed in films and TV forever.
Since then, sharks have been consistently made out to be giant human killers.
In the recent decades, the amount of shark horror films has risen (Telegraph). This has ultimately put this
species in the infamous spotlight, making them appear to be a direct threat to
human safety.
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47 Meters Down (2017) Directed by Johannes Roberts (Wikipedia.com)
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Negative
depictions of sharks are not limited to just fictional movies. Anytime a shark
is even spotted, it seems to be reported across news channels. It was reported
that between 2000 and 2010, more than half of all news articles covering sharks
by 20 major U.S. newspapers had attacks as the primary topic (PubMed.gov). Even with sharks nearing
extinction, only 11% of articles talked about shark conservation.
Humans are the Real Killers
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Propaganda Against Shark Finning (Tumblr.com) |
With
how humans view sharks currently, it is no wonder why we would turn a blind eye
to their declining numbers. Many would be shocked to hear that humans kill an
estimated 100 million sharks annually (FIU
News). This number does not account for shark deaths due to unreported or
illegal catches and bycatch.
With
the rising popularity of shark fin soup, the demand for shark fins has
increased. This has resulted in growing practices of shark “finning,” where fishermen will cut off
all of a shark’s fins and dump the corpse back into the ocean.
Due
to our current fishing practices, scientists have seen shark populations
decline at a very alarming rate. Species around the globe are nearly extinct.
For example, shark species along the cost of Queensland, Australia had
decreased 90% over recent decades (The
Guardian).
You
might be thinking that killing sharks could reduce the chances of humans being
attacked. Wrong! Shark attacks on
humans worldwide have actually increased in recent decades. The only results we
have seen from declining shark numbers have been negative impacts on the entire
ocean ecosystem.
So.. What Do We Do?
As
shark conservation has recently become more of a time sensitive issue, people
are finally starting to wake up. Organizations are beginning to be built with
the sole purpose of conserving sharks. Foundations such as SharkSavers have campaigned across the world to put a stop to shark
finning and have found some success. It was recently reported that there has
been a 50-70% decrease in shark fin consumption in China since 2011 (WildAid).
People
are starting to recognize the harms behind consuming shark fins and have slowed
their consumption. Although this sounds promising, conservation organizations
are still fighting an uphill battle and sharks are still being slaughtered.
The
next step towards protecting sharks is passing legislation that bans shark fin
trade. Currently, the Federal Shark Fin Elimination Act is being processed by
the US Congress (WildAid). This bill
will stop the United States from participating in the devastation of sharks
globally. Sharks have existed on our planet for more than 400 million years.
The only threat to their existence on this planet is us. We need to continue to
raise awareness and change our ways in order to protect sharks and ensure the
health of our oceans’ ecosystem.
Works
Cited
Adkins,
JoAnn. “Fishing Leads to Significant Shark Population Declines, Researchers
Say.” FIU News, 22 Aug. 2013,
news.fiu.edu.
Cox,
Lisa. “Shark Numbers Decline by up to 90% in Five Decades off Queensland
Coast.” The Guardian, Guardian News
and Media, 13 Dec. 2018, www.theguardian.com.
Hawkes,
Rebecca. “From Jaws to The Shallows: How Hollywood Demonises Sharks .” The Telegraph, Telegraph Media Group, 12
Aug. 2016, www.telegraph.co.uk.
Lynch,
Abigail J. “Ten Things More Likely than a Shark Attack.” The Fisheries Blog, 19 June 2017, thefisheriesblog.com.
Muter,
B A, et al. “Australian and U.S. News Media Portrayal of Sharks and Their
Conservation.” Current Neurology and
Neuroscience Reports., U.S. National Library of Medicine, Feb. 2013,
www.ncbi.nlm.nih.gov.
“Sharks'
Role in the Oceans.” Shark Savers :
Sharks' Role in the Ocean, www.sharksavers.org.
Staff.
“Wolf Reintroduction Changes Ecosystem.” My
Yellowstone Park, My Yellowstone Park, 15 Jan. 2019, www.yellowstonepark.com.
Photos
Used
“47
Meters Down Theatrical Release Poster.” Wikipedia,
2017, wikipedia.org.
“The Shallows.” IMP Awards, Aug. 2016, impawards.com.
Trynottodrown.
“Human.” Tumblr, 2015, trynottodrown.tumblr.com.
“Sharknado.”
IMDB, 2013, imdb.com.