September 23, 2017

Observation of the Week, 9/23/17

Our Observation of the Week is this Small giant clam, seen in Egypt by @wernerdegier!

Currently an intern at the Naturalis Biodiversity Center in Leiden, the Netherlands, Werner de Gier is already on his second project there, revising and figuring “a lot of species of the genus Ptychotrema, a group of African cannibal snails. I used a CT-scanner to examine the internal shell structures and tried to solve the complex taxonomy of these species.” This is already after describing two new species of caridean shrimp in Indonesia, “which were associated with colourful tunicates,” so he’s been busy.

And it was on a vacatoin to Hurghada, Egypt, that Werner (below, “showing my snorkeling mask and sense of holiday-fashion”) found the Small giant clam (Tridacna maxima). After exploring the tidal pools near his resort, Werner says

When I almost decided to head back to the beach, I saw a weird brownish blob a few meters ahead. It was a huge Tridacna maxima, which I had never seen of that size and more importantly, had never seen being above the water at low tide. The living shell was partly contracted, but open enough for me to take some pictures. Armed with my second hand camera and being aware of the waves coming in, I took some overview shots of the shell. When I decided to turn around, I felt a splash of water hitting my back. Apparently I placed my feet to close to the shell, triggering the shell to shoot some water out while closing a bit.

While it is a large bivalve, Tridacna maxima gets its common name from the fact that is the smallest of the giant clams, the average specimen being not much more than 20 cm in length. By contrast, the largest attain a length of 120 cm! Like other bivalves, Tridacna maxima is a filter feeder, siphoning in seawater and digest planktonic organisms. However, it derives much of its nutrients from a symbiotic relationship with algae, who create food through photosynthesis. This is one reason they are found in shallower waters than other giant clams. This exposure to the sun is believed the reason for the incredible colors of its mantle - crystalline pigments possibly give them protection from solar rays. The beauty and small size of Tridacna maxima, alas, makes it a target for the aquarium trade. In fact, try and find a video on YouTube 

“Thanks to a friend of mine (@franzanth) I got into iNaturalist and I have to say I’m even a bit addicted to it,” says Werner. “I really like the format of experts identifying tricky species and love the diversity of the species being submitted...I have recommended this community to a few friends of mine and since we’ll be traveling the world as biologists in a few months, I think this is the perfect way to see what’s everybody been up to.”

- by Tony Iwane

- Not only is Werner a published biologist, he’s also creates some great scientific illustrations

- You can check him out on Twitter as well.

- Interesting article about the importance of giant clams in the reef ecosystem.

Posted on September 23, 2017 11:19 PM by tiwane tiwane | 0 comments | Leave a comment

September 22, 2017

Observation of the Week, 9/21/17

Our Observation of the Week is this Euphorbia ankarensis plant, seen in Madagascar by @fabienrahaingo!

Apologies for the tardiness of this blog post, but this week’s observer, Fabien Rahaingoson, has been busy in the field and wasn’t able to get back to me until now. He’s currently spending most of his time collecting seeds and herbs for the Millennium Seed Bank Partnership with the Royal Botanic Gardens Kew. “I collect the seeds with local communities and at the same time I also collect these specimen and send them to Kew and TAN herbarium here in Madagascar,” explains Fabien.

Fabien came across this Euphorbia ankarenesis while working with the community of Andavakoera, in northern Madagascar. It was growing in the Montagne des Français Protected Area. He was immediately interested in it, so he photographed it and added it to iNaturalist. Like other members of its fascinating genus, this plant exudes a milky-white toxic sap when cut, and its flowers are minimal, comprised of only the sexual organs needed for reproduction. Leaves and other plant structures have replaced petals and sepals as ways to attract pollinators. Euphorbia ankarensis lives in the rich humus that collects in limestone formations of the Falaise de l'Ankarana mountain range, from which it gets its species name. Fabien’s observation is one of only three that have been uploaded to iNaturalist so far, and the plant is considered Globally Endangered by the IUCN, threatened by fire, habitat loss, and collection for the plant trade.

Fabien and his colleagues add their observations to the Zavamaniry Gasy Plants of Madagascar project, part of a larger initiative funded by a grant from the JRS Biodiversity Foundation. “For this project we try to promote Malagasy plants with support of @TeamKMCC twitter account,” says Fabien. Thus far, over 10,000 observations of 2,418 species have been added to the project, with hopefully many more on the horizon.

- by Tony Iwane

- Madagascar has quite an array of botanical wonders, check out the over 100 faved observations from the Zavamaniry Gasy Plants of Madagascar project.

- Kew’s Millennium Seed Bank is pretty incredible, learn more about it here.

- Several years ago, our own @loarie visited Madagascar and made a short video of the trip! 

Posted on September 22, 2017 12:49 AM by tiwane tiwane | 0 comments | Leave a comment

September 20, 2017

How iNternational is iNaturalist?

iNaturalist is most active in the US, but has observations in over 95% of all countries globally. This chart below orders the countries in descending order by the number of observations. It also displays the top 5 observers and below that the top 5 identifiers in each country which you can click on the observers and identifiers to explore further. Click here to open the chart in a new window:

Posted on September 20, 2017 02:36 PM by loarie loarie | 4 comments | Leave a comment

September 16, 2017

6M observations total! Where has iNaturalist grown in 80 days with 1 million new observations?

We hit 6 million observations today! It's been a very active and awesome summer since we hit 5 million observations just 80 days ago. This will be a hard stretch to beat as a lot has happened. In fact, we launched image recognition in the iNat iOS app the same week this most recent 1 million observation stretch began!

As we head into the northern hemisphere fall and things mellow out a bit, we thought we'd take a moment to consider this most recent million observations. This map shows all 6 million observations binned into 200 x 200 km pixels. iNaturalist still has the largest number of observations in a few strongholds like California, New England, Texas, Mexico, Italy, and New Zealand.

But where have these most recent million observations had the biggest relative impact? The map below shows the percent increase in observations since the 80-day stretch that produced this most recent million observations began. 100% means that the total number of iNaturalist observations in that pixel doubled in the past 80 days alone. We removed pixels with fewer than 250 observations.

This map is very different than the overall map. iNaturalist strongholds like California and Texas don't show up as very hot because the contribution in the last 80 days isn't that large relative to the number of observations already posted from those places. But certain areas really stand out. For example, how about that bright red pixel in the middle of Brazil? Before the last 80 days, there were 182 observations in that area on the Mato Grosso / Pará boundary in Brazil. But over the last 80 days 564 more observations were posted. This ~300% (564 / 182 * 100% = 309.89%) increase was mostly driven by hundreds of observations from @birdernaturalist and @markuslilje nicely filling out this part of the map.

Theres also larger patterns on the map. Growth in southern Canada reflects a very successful Bioblitz to mark Canada's 150th Anniversary. Eastern Australia has been becoming more active in part thanks to collaborations with the Australian Museum and Questagame. In the United States, iNaturalist is growing rapidly in the Midwest and Rocky Mountains. Meanwhile, iNaturalist continues to get more traction in Europe. I should also mention neat areas of growth in Central/South America, Eastern/Southern Africa, and East Asia,
but we thought this map might be more fun for you to zoom in and explore yourself. You can find that map here if its not displaying below:

Posted on September 16, 2017 12:55 AM by loarie loarie | 5 comments | Leave a comment

September 09, 2017

Observation of the Week, 9/9/17

This group of Haastia pulvinaris plants, seen in New Zealand by @peter_sweetapple, is our Observation of the Week!

Yes, Virginia, that is a plant! peter_sweetapple, a researcher with Landcare Research in New Zealand, found and photographed these Haastia pulvinaris in the northeastern South Island mountains, where they grow in dry, rocky areas. They grow into large hummocks up to 1m x 1m (these are about 30cm, which Peter describes as “quite small”), and in fact are known as “vegetable sheep” due to stories of shepherds hiking out to them, believing they’d found a lost member of their herd.

H. pulvinaris, along with its genus Hastia, are native to New Zealand and are members of the Asteraceae family, also known as the sunflowers and daisies. Peter tells me that a person can sit or stand on these fuzzy wonders without affecting their form, and he explains their structure thusly:

Each ‘mound’ is a single plant comprised of numerous densely packed stems. Each rounded structure on the plant surface is the tip of an individual stem, with woolly appressed leaves packed tightly around the stem tip. Hairs along the leaf margins give the whole plant a velvety texture. The whole structure is a highly evolved adaptation to cold dry conditions; it prevents moisture loss, which is locked up within years worth of dead leaves still attached to the stems and hidden beneath the outer shell of live tightly packed leaves...I encounter these plants, and several other species of similar form, while out tramping (hiking), usually on multi-day excursions to very remote locations.

For his research, Peter studies “introduced mammalian pests in native forests, particularly herbivores , their diets, impacts and management,” and uploaded this observation via NatureWatchNZ, iNaturalist’s sister site in New Zealand. While he’s fairly new to it, he says “ it’s been interesting to see a bunch of people (mainly colleagues) I know and what they are doing on the site. I’m primarily interested in native Alpine and Forest flora but one local ecologist (literally lives just up the road) posts a lot of weed observation, which has made me look more closely at the local weeds.”

- by Tony Iwane

- Here are all 54 observations of Hastia plants on iNaturalist - they really are remarkable.

- Check out a lengthy (of course) New Yorker article about the impact of invasive organisms (especially mammals) on New Zealand’s wildlife.

- Landcare Research has a nice little NatureWatchNZ video on their website.

Posted on September 09, 2017 06:57 PM by tiwane tiwane | 0 comments | Leave a comment

August 27, 2017

Observation of the Week, 8/26/80

Our Observation of the Week is this beautiful mother Auplopus wasp, seen in the Sai Kung District of Hong Kong by @wklegend!

“I love nature dated back to my childhood but it was limited only on reading books and watching videos,” recalls Keith Chen (wklegend). “In Hong Kong, the only way to experience nature is to go to the rural areas. Three years ago, I decided to experience the nature with my camera. I took photos of all kinds of creatures. Now I focus on observations of insects and the habit seems [to have turned] into an addiction.”

Keith was on a trip to the Sai Kung district of Hong Kong, and says “I noticed a small wasp handling its prey not far from me. It belongs to one kind of spider wasp that I have never seen before. I approached it carefully and took some photos. The wasp was using its jaws to pick its prey of a spider without legs...I think my movement alerted the wasp, it picked the prey and quickly flew into the bushes. I did not want to disturb it anymore and left the place.”

Like many wasps, the Auplopus wasp that Keith observed is parasitic for part of its life. It belongs to the Pompilidae family, known as “Spider wasps” because of their predilection for spiders as larval hosts. A pompilid female will paralyze a spider with her stinger than drag it to a nest. She’ll then lay an egg on the paralyzed spider and seal up the nest (sometimes with dead ants to deter predators!); once the egg hatches, the larva will eat the still-living spider saving the essential organs for last. This keeps the host alive and fresh for as long as possible. The larva will then pupate and emerge the next year. As an adult, most pompilids feed on nectar or honeydew for energy. Some pompilids, like those in the Auplopus genus that Keith captured, use their powerful mandibles to snip off the host spider’s legs - all the better for transporting to the nest!

Keith (pictured above) at first know which type of wasp he had observed, but @barthelemy, another iNaturalist user, steered him in the right direction. “Thanks to Mr. Barthelemy as he suggested that it was an Auplopus wasp,” says Keith.

- by Tony Iwane

- Pompilid spiders are known to take down prey larger than they are; here’s a mother dragging a nice-sized spider away.

- Check out this Auplopus and her crazy nest from Namibia!

- Nice blog post on pompilids.

Posted on August 27, 2017 04:34 AM by tiwane tiwane | 0 comments | Leave a comment

August 19, 2017

Observation of the Week, 8/18/80

This amazing conglomeration of Papilio anchisiades idaeus caterpillars, seen in Mexico by luisguillermog, is our Observation of the Day!

A biologist and amateur wildlife photographer who lives in Cancún, on Mexico’s Yucatan peninsula, Luis Guillermo has been working in the jungle for over decades but has never seen an aggregation of caterpillars like the one above, which he photographed.

“The picture was taken in Dzitnup, a tourist site near to Valladolid, Yucatán, during a [family] trip, [this] July,” recalls Luis. “[This was] outside the “cenotes” X’kekén and Samulá…

I was looking for birds when I saw a stain on a tree, but [what] caught my attention [was] the geometric form and then a slight movement. When I saw through the lens could hardly believe that it was a group of caterpillars. I had to look twice. I had never seen this before and I have worked in jungles for 25 years.

Luis said locals “indicated that they had seen before this type of grouping, but they [did] not give me the common name of the "worms" or were they able to tell me that they were butterfly caterpillars. I knew it after, through iNaturalist Page.”

What Luis saw were the caterpillars of the Ruby-spotted swallowtail butterfly. Females of this species lay eggs close together on the leaves of trees in the Rutaceae, or Citrus family, and according Young, et al (1986), “a major feature of larval behavior in P. anchisiades in both field and laboratory is the close physical contact among individuals.” For the first three instars, the caterpillars hang out on leaves during the day and eat at night. They then relocate to the trunks of the tree for instars four and five.

We suggest that aggregative behavior in the larval stages of P. anchisiades enhances visual crypsis to some predators such as birds and lizards. The combined aggregate of several fifth instars on the bark of the host tree creates the image of a mottled blotch of false lichens and bark on the trunk. Similarly, the tightly packed clusters of younger larvae on the ventral surfaces of Citrus leaves resemble dead or dying plant tissue destroyed by a pathogenic microorganism. (Young, et al; 1986)

Like other swallowtail caterpillars, these evert osmeteria when threatened, and “A strong, disagreeable odor, best described as ‘sweaty socks,’ was apparent when the osmeteria of the last two instars were everted.”

Luis, who has over 1,300 observations on iNaturalist, says he uses the iNat “as a form to show the diversity of the Yucatan Peninsula, because I believe that you can only protect or conserve what is known and with the hope to inspire another to observe the richness of life forms around us.”

- by Tony Iwane

- Check out these videos of Ruby-spotted swallowtail caterpillars molting and then metamorphosing!

- Check out the nearly 500 faved observations from the Yucatan Peninsula!

Posted on August 19, 2017 01:04 AM by tiwane tiwane | 0 comments | Leave a comment

August 18, 2017

iNaturalist, Occurrence Data, and Alligator Lizard Mating

iNaturalist is a tool for engagement, helping people around the world get in touch with the life around them and with others who are into nature. But the observations that iNaturalist users collect (over 5.6 million verifiable observations and counting) is also data that can be used by researchers. How does occurrence data from iNaturalist compare to other methods of data collection?

Dr. Greg Pauly (@gregpauly on iNaturalist), Assistant Curator of Herpetology with the Natural History Museum of Los Angeles County and creator of the Reptiles and Amphibians of Southern California (RASCals) project on iNaturalist, recently co-authored Citizen Science as a Tool for Augmenting Museum Collection Data from Urban Areas, which looks at this question. 

Pauly and his co-authors Dakota M. Spear and Kristine Kaiser compared records of four different reptile and amphibian species from VertNet, a database of museum collections, with observations from the RASCals project. They found that in all four species, 

the RASCals citizen-science project generated modern locality records 4–252 times more rapidly than museum collections (Table 1). In 27 months, the RASCals citizen-science project generated 0.36–23.8 times more modern locality records than museum collections acquired over more than 24 years (Table 1). Thus, for three of our four focal species, citizen science provided more data about modern species distributions than the more than 250 natural history collections searchable through the VertNet database.

These numbers are pretty impressive, and as the authors note, up-to-date records are beneficial for giving us a real-time look at species occurrence. It was especially valuable in urban locations, where researchers can’t do exhaustive surveys amongst the “mosaic of private properties that, depending on the taxon of interest, can be difficult or even impossible to survey using standard techniques.”

iNaturalist photos can’t replace museum specimens, which are still hugely important, but “citizen-science projects like RASCals may become a key tool that complements traditional specimen collecting efforts for obtaining data on species distributions throughout the world.”

I had the privilege of speaking with Dr. Pauly in Los Angeles this past May, and here’s a short video of our discussion. He talks about iNat’s importance in understanding urban biodiversity; not only its utility in collection occurrence data, but of rarely observed behaviors such as Alligator lizard mating (see photo above). He and his colleagues at NHMLA are really doing cool stuff with iNaturalist, and I’ll post more videos of them in the future. Check it out! 

- Tony Iwane

Photo credit: Joshua Flatt, CC-BY-NC;

Posted on August 18, 2017 12:35 AM by tiwane tiwane | 0 comments | Leave a comment

August 14, 2017

Observation of the Week, 8/14/17

Our Observation of the Week is this Carpathian Blue Slug, seen in the Ukraine by @cloudya!

Originally from Berlin but in America after studying Forest Ecology at Humboldt State University amongst California’s giant Coast Redwoods, Claudia Voigt dug up photos from a survey in Ukraine to show her friends that there’s an “even more magical slug” than North America’s famed Banana slugs.

Three years ago, when she was studying at the University of Sustainable Development in Eberswalde, Germany, “travelled to the Carpathian Biosphere Reserve in Ukraine. The reserve holds one of the only remaining virgin old-growth forests in Europe. We did a rapid biodiversity assessment and studied the impacts to the reserve by the emerging tourism industry but also by changes in traditional land uses. The Carpathian blue slug was one of the amazing endemic creatures of the old-growth beech forest.”

As its common name suggests, the Carpathian blue slug is endemic to the Carpathian Mountain range of Eastern Europe, and is blue in color. The blue ranges from a turquoise to dark blue and even black, and the slug can be found under logs or in the leaf litter in damp conditions. It’s also a large species, with adults growing up to 14 cm in length!

Claudia, who now does forestry work for California State Parks (and is at Jedediah Smith Redwoods State Park in the above photo), says “I always thought of myself more as a naturalist than a forest ecologist or botanist.” Of iNaturalist, she says “[I] am glad that iNaturalist shares observations with other databases. I want researchers to better understand the distributions and ranges of the organisms they study and find the quality control by curators is very important to make iNaturalist a truly valuable tool.”

- by Tony Iwane

- Here’s a Carpathian blue slug in (slow) action:

Posted on August 14, 2017 09:25 PM by tiwane tiwane | 0 comments | Leave a comment

August 05, 2017

Observation of the Week, 8/4/17

Our Observation of the Week is this Pachyrrynchus congestus beetle, seen in The Philippines by @tonyg

The son of two Biology teachers, Tony Gerard has always been into nature and the outdoors, and he’s even followed in his parents’ footsteps, as a teacher of Biology (and Physical Geography) at Shawnee Community College. “I grew up, and currently live, in an area of great biodiversity- the Cache River wetlands in southern Illinois. It's a great place to visit and an even better place to live!” Tony’s main interest is herpetology (“It's so odd to me that now it's even trendy,” he says, “as a kid I was somewhat ostracized for being the weird kid into snakes and salamanders.”), but he’s also quite interested in other critters such as leeches, flatworms, and gastropods.

And weevils, of course, are also an interest of Tony’s, but mostly in his wife’s homeland, the highlands of Luzon island in the Philippines. “The weevils in the states have always been a nondescript bunch of small brown beetles in my experience,” Tony explains. “Here in the Philippines many are much larger and come in great fun colors and patterns. When they feel threatened they usually just let go and fall into the undergrowth. I've missed a lot of good shots that way. This guy I stuck my hand under as I was focusing - sure enough he dropped - but into my hand. Problem was he didn't want to set still. He kept walking and I had to keep turning my arm to keep up with him.”

There’s not too much information about Pachyrrynchus congestus online, but intrepid iNat user @sambiology was able to dig up this paper, which looks at the structure behind the orange markings of the beetle. From the abstract:

The orange scales that cover the colored rings on the animal’s body were opened, to display the structure responsible for the coloration. This structure is a three-dimensional photonic polycrystal, each grain of which showing a face-centered cubic symmetry. The measured lattice parameter and the observed filling fraction of this structure explain the dominant reflected wavelength in the reddish orange. The long-range disorder introduced by the grain boundaries explains the paradoxical observation that the reflectance, although generated by a photonic crystal, is insensitive to changes in the viewing angle.

“iNaturalist has definitely made me a better naturalist and field biologist,” says Tony (above, with a huge snail in hand). “I'm much more aware and informed about certain groups - especially arthropods and gastropods - from responses I've received on iNaturalist….There is one class I teach, "Field Biology" in which I require students to post observations to iNaturalist. With the current decreases in funding for sciences, iNaturalist is one way in which regular folks can help fill in the gap.”

- by Tony Iwane

 - Like the orange colors on this beetle, many blue colors in nature are structural rather than pigmentary

- There are a ton of awesome organism in the Philippines, check out the faved ones on iNat

Posted on August 05, 2017 05:23 AM by tiwane tiwane | 0 comments | Leave a comment
Member of the iNaturalist Network   |   Powered by iNaturalist open source software