Archive by Author | Margaret Kosmala

Funding from National Geographic Society

Craig writes:

We have just been awarded a second Expedition Council grant from the National Geographic Society to extend Snapshot Serengeti until the end of the year. This covers the end of Season 9.

You, our Snapshot Serengeti volunteers, are the people who make this work possible.  Your careful classifications provide the necessary rigor to make Snapshot a truly scientific endeavor, and we also rely on your enthusiasm and insights in highlighting the many interesting, intriguing and unusual photos, which will someday be compiled in articles and books.

The following paragraphs are taken from our successful application, and give an overview of Snapshot Serengeti’s success broadly:

Our large-scale camera trap grid provides a continuous record of the abundance and distribution of herbivores, insectivores and carnivores in the northern 1000-km2 of the long-term Serengeti lion study area. The camera traps provide accurate abundance estimates of 20 different herbivore species across the Serengeti and near-perfect measures of lion numbers in the woodlands portion of our long-term study area.  The camera traps also reveal that cheetahs are able to coexist with lions by waiting a minimum of 12 hrs after the lions have departed from a particular site and that lions and hyenas largely come into contact with each other as a result of their mutual attraction to wildebeest and gazelle. Our grid also provides a remarkably detailed portrait of the wildebeest migration, showing how movements vary from year to year in response to annual variations in rainfall. Besides providing novel scientific data, many of the camera-trap images are artistic, captivating, breathtaking and hilarious. Because daytime pictures are taken in sequences of three, they can be combined into a brief animation that make the portraits come alive.

The camera-trap imagery has also provided the foundation for a successful online “citizen-science” initiative, called Snapshot Serengeti, where hundreds of thousands of volunteers have counted and identified the animal species captured in over 4,000,000 photographs. We have developed a series of “consensus criteria” for accepting their species identifications, which have 97% accuracy compared to the assessments of a panel of expert field biologists, and our Snapshot volunteers have developed an active online community who share particularly exciting images.

With funding from the Howard Hughes Medical Institute, we have partnered with the College of Biological Sciences at the University of Minnesota to develop an undergraduate laboratory sequence in “Savanna Ecology” where students read relevant articles from the scientific literature, form hypotheses about the behavior and ecology of a species of particular interest, classify and count animals from a random subset of online camera-trap photos, access the overall database, test predictions with simple statistics and present lab reports in a group setting.

Our pre-proposal to extend the camera-trap project for an additional 3-5 yrs has recently been approved by the National Science Foundation, and we will submit the full proposal at the beginning of August.  If funded, we will collaborate with National Geographic to submit a proposal to the educational program at NSF to expand the classroom activities of Snapshot Serengeti to middle- and high-school students around the US.

We have discussed the pictorial potential of SnapshotSerengeti with senior staff at National Geographic, who are interested in featuring a selection of Snapshot highlights in a 2015 article for the Magazine and are also considering publishing the Snapshot photos in either hardcopy or as an e-book. Many of the individual photos are stunningly beautiful, and many more have a unique freshness because the animals have no sense of a human presence. The daytime “triplet” animations live and breathe like pictures in a fantasy novel.  

Our first Expedition Council grant covered the first 3 mos of a 15-month gap in NSF funding when our most recent NSF grant ended in September 2013.  In addition to the first EC grant of $30,000, we raised $55,000 from an Indiegogo crowd-funding effort. A small NSF grant to support my upcoming sabbatical includes a supplementary $25,000 to cover fieldwork in July, August and September.  The $30,000 awarded in the second Expedition Council grant assures continuity of the Serengeti studies until the end of December 2014.  

For the upcoming NSF renewal, we have assembled a well-regarded scientific team to study the Serengeti food web by integrating the lion tracking and Snapshot cameras with new measurements of grasses and soils.  The approval of our NSF pre-proposal means that we have survived the first 75% cut in grant applications, so we have a reasonably good chance of sustaining the project long term.  But even if not successful, the extension of the camera traps for another few months will be extremely valuable, as this will be the first opportunity to measure the wildebeest migration during an active El Nino – rainfall in the Serengeti is highly sensitive to the Southern Oscillation Index (SOI), and the short rains of November-December have largely failed during the past 3-4 yrs of La Nina weather patterns.
 
       

More on the Melanistic Serval

As Meredith posted the other day, one of our camera traps caught a melanistic serval. Melanism is known across a broad variety of animals, but is particularly prevalent in the cat family. Of 37 known species of cat, at least 13 species have melanistic individuals: the domestic cat, the jungle cat, the leopard, the jaguar, the bobcat, Geoffroy’s cat, the kodkod, the oncilla, the colocolo, the jaguarundi, the Asian golden cat, the marbled cat, and the serval.

Why some individuals are melanistic and why cats are particularly prone to melanism is still a bit of a mystery. It is generally thought that melanism is maladaptive – that is, that individuals with melanism are at a disadvantage because they stand out more than normally colored individuals and so are more likely to be targets of predators and competitors. The consequence is that in populations with a lot of melanism, there ought to be some sort of advantage to offset the disadvantage.

Melanistic serval

One possible explanation for melanism is that cats’ black fur helped keep them warm at higher elevations by absorbing more sunlight. This idea came from the fact that many cat populations with high rates of melanism are found at higher elevations. More recently, there have been studies suggesting that melanistic individuals are more resistant to disease.

There’s not a lot of literature on melanistic servals. But I did find an article in the Journal of East African Natural History that listed the known locations of melanistic serval populations in East Africa. Interestingly, the four main populations with melanism are all highland locations: Mt. Kenya and the nearby Aberdare highlands in Kenya and Mt. Kilimanjaro and North Pare Mountains in Tanzania. All of these are in the general geographic region of Serengeti National Park, so it’s perhaps not too surprising that melanistic servals are there too. What is unusual is that the Serengeti is not a highland.

MelanisticServalOur long-term Serengeti experts, with their decades of experience in the Serengeti, are surprised by the melanistic serval snapped by our cameras. David Bygott says that he’s never heard of a melanistic serval in the Serengeti, and Craig Packer says that while he’s seen melanistic individuals of other animals up on the rim of Ngorongoro Crater (a highland), he’s never seen a melanistic serval anywhere. So this Snapshot Serengeti image is likely the only documented evidence of melanistic serval in the Serengeti.

Rolling on

Hello! I haven’t written in a while. After I defended my dissertation in December, I’ve been busy getting ready to move to the Boston area. I have now started a research position (technically called a “postdoctoral fellowship”) at Harvard University.

Harvard Science Center

In this new job, I am putting together a new citizen science project. This project will help scientists better understand and forecast the effects of climate change on North American trees and plants. We have cameras up throughout the U.S. and Canada taking automatic pictures of forests, grasslands, shrublands, desserts, and even tundra. There are already several years of images recorded, so it’s a great data set to play with.

In order to understand the seasonality of trees and plants, we talk about “phenology,” which is the timing of when trees and plants go through their various life stages. You can think about a maple tree, for example, which puts out leaf buds in the spring, grows those leaves into a full green canopy, then those leaves start to change color, and eventually they all fall off the tree in the autumn. These phenology events define all sorts of processes that are important to people – ranging from how much carbon trees and plants take out of the air to the timing of seasonal pollen release (which you might care about if you have allergies).

Phenology image looking out over woodland in New Hampshire

Phenology image looking out over woodland in New Hampshire

Of course, computer algorithms can only do so much, which is where citizen science comes in. The human eye is great at looking at fine details in images and figuring out what’s going on in strange images. For example, one of my colleagues was looking at a measure of greenness in grassland images from Hawaii. This measure was calculated automatically from the images. But something seemed strange. When he went and looked at the individual images themselves, he discovered that there was a common plant that flowered yellow all at once, which changed the greenness in a surprising way.

I’m excited about this new job, but I’m still involved with Snapshot Serengeti. These past couple months, Ali and I have been training Meredith on all the behind-the-scenes image and data processing that goes on both before you see the images and after you’ve classified them. This has slowed down the release of Season 7 (sorry), but ensuring continuity means fewer problems down the line. (By the way, Meredith is a fast learner – it’s just that there’s a lot to learn!) And I’ll still be blogging here periodically.

I’ve had a couple people ask about my dissertation. It’s now published and available online. Note, though, that it doesn’t contain any Snapshot Serengeti content. I was already rather far along in writing it when Snapshot Serengeti launched, so I didn’t have time to include it. We’re working on the first Snapshot Serengeti papers now, though, and we will be sure to let you know when they’re ready to read.

More accidental video

In processing Seasons 5 and 6, I recently stumbled upon a bunch of video files amongst the stills. You may recall that while we have our cameras set to take still images, every once in a while a camera gets accidentally switched to video mode. Then it takes 10-second (silent) clips. Most of these are “blanks” triggered by grass waving in the wind. But every once in a while, we get ten seconds of animal footage. Here are some from Season 5.

Zebras



Giraffe (peek-a-boo!)



Warthog



And, what do you think this is?

Snapshot Team Update

Apologies for such sporadic blog posts recently. We’ve all been quite busy. I successfully defended my dissertation last week. And then I enjoyed the true spirit of Minnesota for the next couple of snowy days, getting to catch up with friends and colleagues whom I haven’t seen in quite some time. But I’m not quite done! I need to make some minor revisions to the dissertation text before submitting it, and this has been occupying much of my time this week, as I need to get it all done before the end of the month – and preferably earlier if I want to enjoy the holidays.

Ali, meanwhile, is deep in analyses of the Snapshot Serengeti data gathered to date. We’re still working on the time issues. If you’ve got crazy Python and/or SQL skills and some free time in the next few weeks, drop us a note. A little help would accelerate Ali’s research while I’m busy finishing up my dissertation work.

And Craig’s diving into the next round of National Science Foundation proposals. The preliminary proposals are due in mid-January and an accepted proposal would restart long-term funding for Snapshot Serengeti starting in 2015. The preliminary proposals are relatively short, but in some ways that makes them harder than the longer ones – we not only have to concisely describe the research, but also convince the reviewers that citizen science yields high-quality data.

While some ecologists are still skeptical of citizen science, more and more are coming to accept it as a valid and valuable way to gather and analyze science data. The astronomy field may be a bit ahead of ecology in this respect, but we’re glad they’re paving the way. And did you hear? The Zooniverse was awarded a $1.8 million Global Impact Award by Google that’s going to allow them to scale up their citizen science platform to host many more projects. I only wonder what citizen scientists will do in the (perhaps not too distant) future, when they have hundreds of citizen science projects to select among. How will you choose which ones to try?

Happy Thanksgiving

Tomorrow is American Thanksgiving. Whether or not you celebrate Thanksgiving this week, I hope you’re able to spend time with family,

Spend time with family

Spending time with family

hang out with friends,

Hanging out with friends

Hanging out with friends

find some tasty food to eat,

Good eats!

Good eats!

get some rest,

Getting some rest

Getting some rest

and give thanks for the good things in life.

Giving thanks

Giving thanks

And a special thank you from us to you for all the work you’ve put in to classifying animals on Snapshot Serengeti.

Graduate School

Maybe from time to time you’ve wondered: Who are these scientists running Snapshot Serengeti? How did they get where they are? (And why am I sitting here instead of traipsing across the Serengeti myself?)

Ali and I are both graduate students at the University of Minnesota. What that means is that a while ago (seven years for me!) we filled out an application and wrote some essays for admission to the University of Minnesota’s graduate school — just like you would do for college admissions. The difference is that for graduate school, you also need to identify an advisor — a faculty member who will become both your mentor and your judge — and an area of research that you want to pursue. And while the admissions materials matter, it’s very important that your future advisor want to take you on as a student and that your area of research interest meshes well with hers or his.

In the U.S., you can apply for a Masters program or a Ph.D. program. In some places you can get a Masters on the way to a Ph.D., but that’s not the case at Minnesota. So I applied for the Ph.D., got admitted and started as a Ph.D. student in the fall of 2007. I’m pretty much only going to talk about Ph.D.s from here on out. And I should point out that graduate school systems vary from country to country. I’m just going to talk about how it works in the U.S. because I’m not terribly familiar with what happens in other countries.

For the first 2-3 years in our program, students spend much of their time taking classes. These are mostly higher level classes that assume you already took college-level classes in basic biology, math, etc. I came in with an college degree in computer science, and so a bunch of the classes I took were actually more fundamental ecology and evolution classes so I could get caught up. But many classes are reserved for just graduate students or for grad students plus motivated seniors.

At the same time as taking these classes, students are expected to come up with a research plan to pursue. The first couple years are filled with a lot of anxiety about what exactly to do, and there are plenty of missteps. My first attempt at a research project involved tracking the movement of wildebeest in the Serengeti using satellites and airplane surveys. (Yes, you can see individual wildebeest in Google Earth if you hunt around!) But it turned out not to be a logically or financially feasible project, so I discarded it — after a lot of time and energy investment.

Around the end of the second year and beginning of the third year, grad students in the U.S. take what are called “preliminary” or “comprehensive” exams. These vary from school to school and from department to department. But they usually consist of both a written and oral component. In some places the goal of these exams to to assess whether you know enough about the broad discipline to be allowed to proceed. In other places, the goal is to judge whether or not you’ve put together a reasonable research plan. The program Ali and I are in leans more toward the latter. It requires a written proposal about what you plan to do for research. This proposal is reviewed by several faculty who decide whether it passes or not.

If you pass your written component, you then give a public talk on your proposed research followed by a grueling two to three hour interview with your committee. In our program, students choose their committee members, following a few sets of rules about who can be on it. My committee had five people, including my two advisors. They took turns asking me questions about my proposed research, how I would collect data, analyze it, how I would deal with adversity. The committee then met without me to decide whether I passed or not. (spoiler: I passed)

So, assuming a student passes the preliminary exams, she or he is then considered a “Ph.D. Candidate,” which basically means that all requirements except the actual dissertation itself have been fulfilled. If you’ve ever heard the term “A.B.D.” or “All But Dissertation,” that is what this means. The student got through the first hurdles, but never got a dissertation done (or accepted).

Now it’s time for the research. With luck, persistence, motivation, and lack of confounding factors, a student can do the research and write the dissertation in about three years. Doing research at first is slow because, like learning anything new, you make mistakes. I spent a lot of time gathering data that I’m not going to end up using. Now that I’ve been doing research for a few years, I can better estimate which data is worth collecting and which is not. And so I’m more efficient. While doing research, the student is also reading other people’s related research, and often picking up a side-project or two.

Eventually, the student, together with the advisor(s) and committee members, decides that she or he has done enough research to prove that she or he is a capable professional scientist. All the research gets written up into a massive tome called the dissertation. These days, it’s not uncommon for graduate students in the sciences to write up their dissertation chapters as formal papers that then get published in scientific journals. Sometimes one or more chapters is already published by the time the dissertation is submitted.

When the writing of the dissertation is finished, it gets sent to the committee to read. The student then gives a formal, public talk on the results of the dissertation research, followed by another two to three hour interview with the committee. This time it’s called the “Dissertation Defense,” and the committee asks questions about the research results (and possibly asks the student to fight a snake). The committee then meets without the student and comes up with a decision of whether the student passes or not. There is also often a conditional part of this decision that requires some portion of the dissertation to be revised or added to. So, a decision of “pass, conditional on the following revisions:” is pretty common.

I should mention that while being a grad student has been mostly quite fun, you may not want to drop your day job and run off to academia just yet. There’s the issue of funding. On the plus side, you can acquire funding in the sciences so that you don’t have to take on debt to do your degree (which is not so true in the humanities). Ali and I have both applied for and received fellowships that have allowed us to do most of our graduate program without having to work. But many — maybe most — grad students in the sciences work essentially part-time jobs (20 hours/week) as teaching assistants for faculty. This can really slow down research progress, as well as making some types of research impossible (for example, those that require lengthy trips to the Serengeti). Whether working or on fellowship, students typically gross no more than $30,000 annually, and often less than $25,000, which can be quite reasonable (single person living in a low-cost-of-living area) or prohibitive (person supporting a family living in a high-cost-of-living area). Benefits are pretty much non-existent, with the exception of health coverage, which can range from great (thanks, Minnesota!) to really bad to non-existent.

I mention all this this because I am about to defend my dissertation! In a little less than two weeks I will give a talk, sit down with my committee, and try to convince them I’m a decent scientist. Wish me luck.

The scourge of Daylight Savings Time

As Ali mentioned, we’re working on figuring out timing issues for all the images in Snapshot Serengeti. Each image has a timestamp embedded in it. And that time is Tanzanian time. You might have noticed that sometimes the time associated with an image doesn’t seem to match the time in the photo — especially a night shot with a day time or a day shot with a night time. We initially shrugged that off, saying that some of the times get messed up when the camera gets attacked by an animal.

But it turns out to be more complicated than that. All the times you see on Snapshot Serengeti — either when you click the rightmost icon below the image on the classify screen, or when you look at a capture in Talk — are on West Greenland (or Brazil) time. Why is that? Well, databases like to try to make things “easy” by converting timezones for you. So when the images got loaded up onto the Zooniverse servers, the Snapshot Serengeti database converted all the times from what it thought was Coordinated Universal Time (UTC) to U.S. Central Time, where both Minneapolis and Chicago are. That would mean subtracting six hours. But since the times are really Tanzanian ones, subtracting six hours sticks us in the middle of the Atlantic Ocean (or in Greenland if we go north or Brazil if we go south).

That wouldn’t be so bad, except for Daylight Savings Time. Tanzania, like everywhere close to the equator, doesn’t bother with it. It doesn’t make sense to mess with your times when sunrise and sunset are pretty much as the same time all year round. However, the ever-helpful database located in the U.S. converted the times as if they experience Daylight Savings Time. So on dates during “standard time,” the Snapshot Serengeti times are off by six hours; subtract six hours to find out the actual time the image was taken. But on dates during daylight savings, the times are off by just five hours.

blackboard

11:35am Tanzanian time. Shown as 4:35pm on Snapshot Serengeti.

And to make things more of a headache for me, those images that got taken during the hour that “disappears” in the spring due to Daylight Savings Time, get tallied as being taken the hour before. This might explain why we get some captures that don’t seem to go together: the images were actually taken an hour apart!

So now I’m focusing on straightening all the timestamps out. And when I do, I’ll ask the Zooniverse developers if we can correct all the times in Snapshot Serengeti so that they’re shown in Tanzanian time. Hopefully we’ll have that all set before Season 7.

By the way, I was able to figure this all out pretty quickly thanks to the awesome blackboard collection that volunteer sisige put together. You can see the actual Tanzanian time on many of the blackboards and confirm that the online time shown below the picture is five or six hours later, depending on the time of year. Many thanks to those of you who tag and comment and put together collections in Talk; what you do is valuable — sometimes in unexpected ways!

Winter vacation

In the winter months (northern hemisphere winter, that is), we catch white storks on camera. They’re taking their winter vacation in the Serengeti — and across eastern and southern Africa.

stork

White storks are carnivorous, eating insects, worms, reptiles, and small mammals. A flock of them like this makes me wonder about the diversity of small critters that they eat that we don’t catch on camera. Because they eat small animals, they can sometimes be seen near fires, ready to gobble up those creatures trying to escape flames and smoke.

The white stork has a favorable reputation with people in both Africa and in Europe, because it feeds on crop pests. In the spring, storks leave their wintering grounds and head north to Europe to breed. They build large nests out of sticks and are happy to do so on buildings and other structures with wide, unencumbered supports. And because they are considered useful — and sometime good luck — people allow them to build their nests on buildings. These nests are then frequently re-used year after year.

Several years ago I went to Poland to find my grandmother’s childhood home. This was made a bit challenging because when my grandmother was a child, the area was part of the Austro-Hungarian Empire and the names of everything — towns, streets — were in German. These days, of course, all the names are in Polish. After finding a list of place name translations, I set out to see if I could locate some buildings my grandmother described in her memoirs in a small town in the countryside outside of what is now Wrocław and was then Breslau. One of these was “Grandfather’s [my great-great-grandfather's] water mill with its stork nest on the roof.” Sure enough, I found a large old building in the middle of town right by the stream. It no longer sported a water wheel, but there on the roof: a stork’s nest, complete with stork.

Pangolin!

A few weeks ago, Snapshot Serengeti volunteers spotted a Pangolin in Season 6. This is the best pangolin shot we’ve ever seen in this project.

pangolin

Pangolins are rare and nocturnal, so you don’t see them often out in the field. The pangolin species we have in the Serengeti is called the ground pangolin (Manis temmincki), and it ranges from East Africa though much of Southern Africa.

I once went to Kruger National Park in South Africa for a conference and went on a guided tour in my free time; the tour leader asked what we wanted to see, and I shouted out “pangolin!” The tour leader gave me a withering look and we then went out to see the elephants and giraffes and buffalo that the other tourists were eager to see. I really did want to see a pangolin, though. I’ve never seen one in real life.

Pangolins have scales all along their back and curl up into balls like pillbugs when they feel threatened. They hang out in burrows that they either dig themselves or appropriate from other animals. And they have super long tongues that they use to get to ants and termites, their primary food. Pangolins have one baby at a time, and young pangolins travel by clinging to the base of their mother’s tail.

Pangolins don’t have any close living relatives. In fact, they have an order all to themselves (Pholidota). Because of how they look, scientists used to think they were most closely related to anteaters and armadillos. But now with genetic tools they’ve discovered that pangolins are more closely related to the order Carnivora, which includes all cats and dogs. It’s a bit strange to think that pangolins, which are sometimes called “scaly anteaters” have more in common genetically with lions than with actual anteaters, but that’s what the science tells us.

Many thanks to all of you who marked the new pangolin image in the Talk forum. That lets us make sure it gets classified correctly. ‘Pangolin’ was just one of those rare animals that didn’t make it onto the list of animals you can choose from, so our algorithm will classify it as something else, which we will fix by hand.

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