Showing posts with label Endangered. Show all posts
Showing posts with label Endangered. Show all posts

Sunday, February 5, 2017

I Love It When You Call Me Big Papa

Whether you love him, hate him, or don't care either way; Barack Obama's presidency ended on January 20th. While the 44th president has had a rough time forming a lasting legacy on many fronts; he's proven himself to be the public lands president. Since taking office in 2009 Obama has set aside more land, and even more relevant to Depth and Taxa, ocean than any president in history.

Obama is basically that kid in school who trashed
the curve for everyone else.
Graph based on National Park Service Data

There's a number of ways that land and sea can protected from exploitation in the US. Areas can be set aside as National Parks; which basically prevents them from use other than research and outdoor recreation. Lands can be established as National Forest; which has a conservation aspect but also allows for some extraction of resources. However both of these designations require action by Congress. Action is not something the 114th Congress was famous for. So if a president believes the people that elected him want lands protected, but can't get congress to do anything, how does he go about it? Enter the Antiquities Act.

In the final years of the 19th century Americans were concerned about the rampant destruction of archaeological sites and ecosystems across the country. In response, Congress created the Antiquities Act to allow important cultural, historical, and scientific places to be protected as National Monuments; without the delay that comes from congressional deliberation. Unsurprisingly, Teddy Roosevelt used the act to set aside more acreage than any president until his fifth-cousin took the job in 1933.

"Hahahaha, just try and outdo me little Frankie. I'm the only 
president  this century that everyone liked." -Teddy Roosevelt

You might expect that Democratic presidents are more likely to use the antiquities act, but the exact same number of Democrats and Republicans have established or enlarged National Monuments. In fact, one of the largest ever national monuments was established by the number two acreage protector, none other than George W. Bush! The Papahānaumokuākea (pronounced: papa-ha-now-mo-ku-ah-kay-ah) National Monument was established in 2006 by president Bush and expanded by over 400,000 square miles in 2016 by president Obama.

Papahānaumokuākea (Or for Notorious B.I.G. fans: Big Papa) hits every mark for the intent of the Antiquities Act. It has important historical sites; like Midway Atoll where the Allies scored a major naval victory in World War II. Culturally important places to indigenous Hawaiians. The northwest islands in the monument are believed to be where spirits are born and return to after death. And major ecologically and scientifically important ecosystems. Shallow and deep water stony coral reefs, breeding grounds for endangered species, islands full of endemic plants and animals, and a sea mount as high as Mount Rainier are all found inside the monument.

If we place Papahānaumokuākea on top of the US it's as long as Idaho to Indiana
and as wide as Montana to central Utah.
Image Courtesy; NOAA

Not only does Papahānaumokuākea represent the ideal of what a national monument should be; the restriction it puts on commercial fishing, but not recreational fishing, comes at an essential time in the health of the ocean. There's a growing consensus that about 30% of the world's seas needs to protected from large-scale fishing if we want to continue to feed humanity with good, healthy protein.

 Currently less than 2% of the ocean is covered by marine protected areas, so there's lots of work to be done. Fortunately we already have some guidelines on what makes for an effective marine protected area. One standard uses what are called NEOLI features to plan and assess successful marine protected areas. NEOLI stands for: "No-Take, Enforcement, Old, Large, and Isolated". If a protected marine site can meet four of those five features it's likely to be successful in promoting biodiversity, and in allowing fisher people to collect better catches with less effort at the edge of the protected zone.

"What's that about catching more fish with less effort!?" -This Hawaiian Monk Seal
Courtesy: Dr. James P. McVey, NOAA Sea Grant Program. (NOAA Photo Library: anim0290) 

Obviously Papahānaumokuākea meets the "large" standard, but how's it do in those other areas? Papahānaumokuākea isn't a no-take zone because recreational and sport fisheries are still able to get permits to use the area. However, the scale of recreational fishing is so small relative to commercial fishing that this represents a potentially huge cutback in the amount of harvest within the monument. And before you get frustrated that small scale commercial fishers will be going out of business there's great news. Research has shown that when areas are protected from fishing, species tend to repopulate the protected area and spill over into fishing sites. The edges of the protected area usually have more numerous, larger, and healthier fish than areas far from any protected zone.

Of course no-take doesn't matter if you don't have strong enforcement. This is where Papahānaumokuākea will probably struggle most to meet the standards for protection. The monument is managed by a partnership between the federal and Hawaiian state governments. Hopefully a strong realtionship between these parties will be able to monitor such a vast area. Thankfully some very cool systems are coming online in the near future to help countries protect their natural resources. The Pew Charitable Trusts have developed an incredibly cool program called: Project Eyes on the Seas that uses satellite images, vessel GPS transponders, and home port data to police marine protected areas for relatively cheap.

       Bad Boys, Bad Boys, What'cha Gonna Do? What'cha Gonna Do,
When They Come Fo' You!?
Courtesy: Tony Hisgett via Wikimedia Commons

Now obviously any newly expanded or created national monument isn't going to be considered "old". However, Papahānaumokuākea meets the last NEOLI standard by being isolated from cities and continents, and so thankfully hasn't historically been heavily impacted by human activities. Because exploitation has been limited, Papahānaumokuākea has many of the features we normally associate with old marine protected areas. In fact, in the deep channels between the islands, atolls, and sea mounts of the Hawaiian chain live black corals that have been growing in the same spot for 4,000 years.

Using the NEOLI standards, it looks like Papahānaumokuākea has the potential to help the ocean recover from our historical transgressions, and to provide for humanity in the future. Good environmental policy is about finding balance; meeting the needs of many while protecting the most vulnerable. The ecosystems that produce the natural resources we need have to be kept intact if they're to continue to provide raw materials, jobs, food, inspiration, and a connection to something larger than ourselves. National Monuments like Papahānaumokuākea are an important part of the land-use mosaic that allows the United States to provide the best life for its citizens.

The incoming administration has expressed a focus on the harvest and materials side of the benefits of the environment. An extractive management style may put places like Papahānaumokuākea at risk of having their protections revoked. Both goat farming hippies and doomsday preppers can agree that people have the right to survive off the land. If we can work to remind everyone that all the materials of our modern lives originated from, and are replenished in, pristine ecosystems; then places like Papahānaumokuākea will have a better chance of remaining unaltered. Let's work together to build a broad coalition of people who know the value of functioning ecosystems.

References:

Roberts, Callum M., Hawkins, Julie P., & Gell Fiona R., "The Role of Marine Reserves in Achieving Sustainable Fisheries", Philosophical Transactions of the Royal Society B, Vol. 360 pg. 123-132, 2008.

Bruckner, Andrew, De Angelis, Patricia, & Montgomery, Tony, "Case Study for Black Coral From Hawaii", Non-Detriment Findings Case Studies, WG 9- Aquatic Invertebrates, Case Study 1, Meeting of the IUCN 2008. 
Accessed via: http://www.conabio.gob.mx/institucion/cooperacion_internacional/TallerNDF/Links-Documentos/WG-CS/WG9-AquaticInvertebrates/WG9-CS1%20BlackCoral/WG9-CS1.pdf

Edgar et Al. "Global Conservation Outcomes Depend on Marine Protected Areas with Five Key Features", Nature, Vol. 506, Pg. 216-229, Feb. 13th 2014.
Accessed via: http://www.nature.com/nature/journal/v506/n7487/full/nature13022.html

Long, Tony, "How Satellite Monitoring is Helping Catch Bad Actors", Pew Charitable Trusts Research & Analysis Online, March 7th 2016.
Accessed via: http://www.pewtrusts.org/en/research-and-analysis/analysis/2016/03/03/how-satellite-monitoring-is-helping-catch-bad-actors

US Congress, "American Antiquities Act of 1906"
Accessed via: https://www.nps.gov/history/local-law/anti1906.htm

Thursday, March 19, 2015

Party Animals

Starting around this time every year, thousands flock to Florida's beaches with only one thing on their minds. They come from all along the Atlantic and the Gulf in droves to spend a few days getting wild with others they've barely met. That's right it's time for Spring B....eginning of loggerhead sea turtle nesting season.

What did you think I was talking about?
Courtesy: Daytona Spring Break via Flickr

Well actually spring break and loggerhead (Caretta caretta) nesting season don't match up perfectly. Thank god, can you imagine what kind of stuff a bunch of drunk bros would get up to with hundreds of sea turtles? Only the very first nesters come in during April, and the breeding season continues through the summer. Around the world's sub-tropical regions loggerheads return to the beaches they were born at to pass on their genes. The Southeast coast of the US hosts more loggerhead sea turtles than most other breeding regions around the world. Florida is especially important to these turtles. Ninety percent of all loggerheads born in the US nest in Florida.

Spring breakers and sea turtles have other things in common besides an intense urge to mate. They both have many stepped journeys that take them to the beaches of the southeast. After birth, young turtles head out to the open ocean and usually spend their first 5-7 years out at sea. It may seem a little odd for baby turtles to head out to the open ocean since there aren't a lot of places to hide, but there are far fewer predators out there. Plus the Atlantic has a unique region called the Sargasso sea which is named for its abundant floating fields of Sargassum (pronounced: sarj-ass-um) algae. Sargassum is perfect for little turtles because it's about the same color as they are and has a lot of spatial complexity for them to hide in. In these floating prairies, young loggerheads can grow fat on a diet of just about anything. Unlike other toddlers they aren't particularly picky and chow down on jellies, squid, shrimp, crabs, clams (even Tridacna), and fish. As they grow loggerheads rely on increasingly hearty prey so, like a college student raiding your fridge when he/she comes home for the summer, the turtles return to more abundant coastal waters to feed.

"Mom! Mom! You need to run to Costco again!"
Courtesy: rosepetal236 via Flickr


But how do the turtles find their way? Human college students have the benefit of Google maps and Expedia, but loggerheads' flippers make it hard to type. Instead sea turtles use the magnetic field of the earth to navigate. To understand how this works we need to know a little bit about the magnetic field itself.

Beneath the planet's mantle, but above the very center is a region called the outer core. The outer core is made of liquid iron mixtures and it moves around in loops thanks to the heat put out by the inner core. The conductive nature of the iron ensures that as the mixture moves around it generates electrical current, which in turn creates a magnetic field. The planet's magnetic field varies in several ways across the surface of the earth. It has an angle relative to the center of the planet that becomes steeper the closer you get to the poles. The magnetic field also varies in its strength changing along seemingly more random lines (It's weakest around South America and strongest around Siberia and the ocean south of Australia). If you can somehow detect these different lines of magnetism (called isolines) you can use them to figure out where you are on the planet, just like you would use lines of latitude and longitude.

"Stop asking me to pull over, I know exactly where we are."
Courtesy: Wendell Reed via Flickr

Amazingly scientists have enough behavioral evidence to confidently say that turtles navigate by detecting the earth's magnetic field, but don't have enough evidence to figure out exactly how they do it. The problem is it's easy to do experiments and scan data to see where turtles are going, but it's really hard to find possibly microscopic structures that sense magnetism. Perhaps the most compelling way animals might detect isolines is by having evenly spaced crystals of magnetite in their bodies. Magnetite is an iron mineral that has magnetic north and south poles, just like man made magnets. If a series of magnetite crystals is laid out in a line then they'll push away from each other when they're turned perpendicular to a magnetic field, but pull towards one another if they're lined up with it. Magnetite has been found in salmon, several species of birds, and sea turtles, all of which are highly migratory. Scientists think these animals might be able to gauge how much the crystals are pulling or pushing on one another to figure out how isolines are oriented.

Orienting themselves by magnetic fields is so important to loggerheads that they familiarize themselves with the unique magnetic coordinates of their home beach as they hatch. Then as the turtles return, if the isolines have shifted which they often do, the turtles will dig nests away from their birth place.

Despite their incredible abilities loggerheads are an endangered species. Their biggest threat is coastal development and negative interactions with humans since they prefer the same beaches we do. So for anyone out there planning a trip to Florida this spring break; remember that loggerhead turtles are there to have a good time too. If we treat each other with respect then humans and turtles can all have as much fun as this kid:


References:

Brothers, J. Roger, & Lohmann, Kenneth J., "Evidence for Geomagnetic Imprinting and Magnetic Navigation in the Natal Homing of Sea Turtles", Current Biology, Vol 25 Issue 3, 2015, DOI 10.1016/j.cub.2014.12.035. Accessed via:

Lohmann, Kenneth J. & Johnson, Sonke, "The Neurobiology of Magnetoreception in Vertebrate Animals", Trends in Neuroscience, No. 23, 2000. Accessed via:

The Earth's Magnetic Field, University of North Carolina's Oceanweb. Accessed via: http://www.unc.edu/depts/oceanweb/turtles/juvenilemap/EarthMF.html

"Caretta caretta, Loggerhead Sea Turtle"
The Encyclopedia of Life
Accessed via: http://eol.org/pages/1056566/details

Sunday, October 12, 2014

Sympathy for the Devil Fish

In case you've never heard the Rolling Stones song Sympathy for the Devil; go ahead and watch this video. Not only will having the song in your head make this post make a lot more sense, but it's also one of my favorite songs of all time.


Below you'll find the Depth and Taxa version of the lyrics. There's some ambiguity as to which animal I'm talking about, so see if you can figure it out before the end.

Please allow me to introduce myself
I’m a fish with planktonic taste
I’ve been around the whole wide world
Swum many a mile ‘cross the wastes

And I went  down to Africa
From the Azores, out at sea
Made the trip on currents
WOO! WOO!
Courtesy Grant Bishop via Flickr
that pushed me ‘long, and let me feed

Pleased to meet you
Hope you guess my name
But what’s puzzling you
Is the fact that I’m so tame

We’re all ovo-vi-vipar-ous
When we know that it’s time, to give birth
Got a real long gestation
Often times, it’s two years

My bat like wings
Are the perfect things
For the heaving seas
That I slowly swim
WOO! WOO!
Courtesy Kevin Bryant via Flickr

Pleased to meet you
Hope you’ll guess my name, oh yeah
Ah what’s puzzling you
Is the fact that I’m so tame, oh yeah

I made the list
When your scientists
Noticed the decline
Of this group of mine
Men shouted out,
“Look at those devil horns!”
When really they
Are ce-pha-lic fins

Let me please introduce myself
I’m a fish of planktonic taste
And I’ve been trapped in big drift nets
Who just write me off as their bycatch
WOO! WOO!
Courtesy William Warby via Flickr

Pleased to meet you
Hope you guessed my name
But what’s puzzling you
Is the fact that I’m so tame

Pleased to meet you
Hope you guessed my name, oh yeah
But what’s confusing you
Is the fact that I’m so tame

Just as all true seals are the phocidae
And all the squalids, sharks        
We're devil rays
just call me Mobula
Cause I’m in need of some defense

So if you catch me
Have some courtesy
Have some sympathy, and instinct
Use all your well-learned fishing tricks
Or I’ll end up, gone extinct, oh yeah
WOO! WOO!
Courtesy Patrick Neckman via Flickr

Pleased to meet you
Hope you guessed my name, oh yeah
But what’s puzzling you
Is the fact that I’m so tame








So did you figure it out before the end? The animal is, of course, the last image: the giant devil ray (Mobula mobular). I hope you enjoyed the different format this week. If you have questions, or you'd like a little bit more traditional post about these beautiful fish, let me know in the comments!

References:

"Skates and Rays" The Shark Trust

"Mobula moblar: Devil Ray" Encyclopedia of Life