Urban Boston Fall Pollinator BioBlitz!

This weekend, September 26-27, 2020, join TPI for a fall pollinator bioblitz! If you live in the city around Boston (east of I-95) get out during the weekend to observe pollinators—bees, butterflies, hover flies, wasps, and beetles—and post your sightings to iNaturalist. There will be so many insects to see, including monarch butterflies, bumble bees, paper wasps, goldenrod beetles, and more! If you’re not familiar with iNaturalist, see this guide for getting started.

During the bioblitz, TPI biologists will be scouring the flowers in our gardens on the Tufts University Medford-Somerville campus. We hope you’ll get out in your yard or neighborhood to look for pollinating insects, too. Your participation in this bioblitz will help TPI biologist better understand how gardens support pollinators in the city.

Never participated in a bioblitz before? Here are some tips to get you started:

Tufts University Medford-Somerville is now a Bee Campus USA!

TPI is excited to announce that we have reached our goal: Tufts University Medford-Somerville has become the first urban educational institution in Massachusetts to be certified as an affiliate of the Bee Campus USA program! Bee Campus USA is designed to marshal the strengths of educational campuses for the benefit of pollinators via the creation of pollinator habitat, service-learning projects, and educational programming.

Funded by the Tufts Green Fund in 2019, we created TPI as an ecological, educational, and collaborative effort to bolster pollinator health and promote community awareness on the Medford-Somerville campus. If you’ve been keeping up with our blog, you may have heard that we have planted three pollinator-friendly gardens on the Medford-Somerville campus, which provide forage for pollinators from May through October. In just one year, we reached over 2,000 people via public-facing events such as Tufts Community Day, workshops, lectures, and the recent screening of The Pollinators. We have also advised pollinator conservation efforts at other universities in the Boston Area (e.g. Lesley University, Northeastern University) as well as other Tufts campuses. In this year’s round of Green Fund projects, the Sustainability Committee at the School of Museum of Fine Arts (SMFA) at Tufts was awarded funds to create pollinator-friendly gardens on their Boston campus. We cannot wait to help the SMFA Sustainability Committee create signage and select plants for their gardens!

TPI members with Peter Nelson, director of The Pollinators, following our Pollinator Fair (complete with honey tasting!) and film screening.
Nick Dorian teaches young community members about which crops are pollinated by bees at Tufts Community Day.

Elizabeth Crone, Professor of Biology and TPI member, is excited about the opportunities for student research and service-learning with the Medford-Somerville gardens: “In the same way that National Parks were a new idea in the early 1900’s, urban pollinator gardens are the next frontier for conserving insect diversity in the 21st century.” Our on-campus pollinator gardens have already been integrated into a Tufts undergraduate-level course, “Insect Pollinators and Real-world Science,” where students visited a garden and created their own pollinator-specific planting guides. We are now working to create undergraduate research projects to survey pollinator biodiversity and the food resources (nectar and pollen) the gardens provide, and recently created an iNaturalist Project for community scientists interested in contributing biodiversity data.

Bee City USA and Bee Campus USA are initiatives of the Xerces Society for Invertebrate Conservation, a nonprofit organization based in Portland, Oregon, with offices across the country. Bee City USA’s mission is to galvanize communities and campuses to sustain pollinators by providing them with healthy habitat, rich in a variety of native plants, i.e. food resources for pollinators. Animal pollinators such as bumble bees, sweat bees, mason bees, honey bees, butterflies, moths, beetles, flies, hummingbirds and many others are responsible for the reproduction of almost ninety percent of the world’s flowering plant species. In fact, one in every three bites of food we consume is thanks to animal pollinators, specifically insects!

“The program aspires to make people more PC—pollinator conscious, that is,” said Scott Hoffman Black, Xerces’ executive director. “If lots of individuals and communities begin planting native, pesticide-free flowering trees, shrubs and perennials, it will help to sustain many, many species of pollinators.”

We would like to thank to the Tufts Green Fund for funding this project, the Garden Club of America for their support, and our current and past members for helping us toward our goal! As a certified Bee Campus USA, we will continue doing outreach, education, and research, and spreading the pollinator love!

TPI supports pollinators by cultivating native plants on the Medford-Somerville campus. Here, a monarch collects nectar from blazing star.

TPI goes to Costa Rica!

Nick after a successful coffee fruit harvest!

To kick off 2020, several TPI members spent two weeks in Costa Rica on a tropical field ecology trip. While there, we saw a smattering of animals and plants, such as Costa Rica’s largest weevil, kinkajous sipping nectar from balsa flowers, and scarlet macaws; we harvested coffee on a farm in Santa María de Dota and learned to identify flavors associated with high quality beans; and released baby sea turtles into the ocean. All in all, an unforgettable trip.

Of course, we also got up close with diverse pollinators. This post, written collaboratively by TPI members, highlights our favorite pollinator groups that we saw. 

Butterflies: Costa Rica is home to over 1,200 butterfly species of diverse colors and sizes. The blue morpho, known for its iridescent blue, has a wingspan of up to 8 inches! In contrast, skippers often have a wingspan no larger than 1 inch. Although they look very different, blue morphos and skippers are both fast fliers and difficult to catch (in net and on camera). Here, I snapped a picture of a skipper taking a drink from…a sweaty sock!

Skipper foraging for salts on a sweaty sock. PC: Rachael Bonoan.

Although this may sound gross to us, sweat and mud puddles are an important source of sodium for skippers and other butterflies. Most butterflies only eat nectar, which provides plenty of sugar energy for flying, but is lacking in sodium. Among other things, sodium is important for water-regulation and mating in butterflies. I also had the opportunity to watch swallowtail caterpillars transition to adult butterflies. This caterpillar is in the “pre-pupal” stage—it’s beginning to shed its skin and spin its chrysalis. Once the caterpillar has spun its chrysalis, it is in the “pupal” stage. During this stage, the caterpillar undergoes many changes in order to become a beautiful butterfly!

Bats: Costa Rica is home to 112 of the over 1100 species of bats worldwide, giving the country one of the most diverse bat populations in the world, and making it an important site for bat conservation. Many native plants and crops in Costa Rica, including bananas, depend entirely on bats for pollination or seed dispersion. Bats spend their days sleeping in hollow trees and under palm leaves, and at night take to the sky in search of bugs, fruit, and nectar for food. Bats eat a huge number of mosquitos and can provide better pest control than birds in agricultural fields. They spread pollen when feeding on nectar and disperse seeds after eating fruits. And bats are the only mammal that can fly! Costa Rica is home to three species of vampire bats, and to several rare species like the honduran white bat. The next time you enjoy a banana, peach, or margarita (bats pollinate agave!) thank a bat!

Stingless bees: Although bumble bees (Bombus) are the dominant wild social bees in temperate areas, stingless bees (Meliponini) have full reign over the tropics. Throughout the neotropics, including Costa Rica, stingless bees are important crop pollinators and they are prized for their delicious and medicinal honey by bee keepers, who are known as meliponiculturalists.

Intriguingly, in addition to flowers, stingless bees also visit many non-floral resources for salt, including rotting fruit, muddy water, human sweat, urine, and even carrion. It is this last resource that sufficiently piqued the interest of two TPI members to study the foraging preferences of stingless bees on rotting meat. We hung up chicken baits that we had marinated in a variety of salt solutions and watched them over two days to determine if stingless bees are indeed going for salts when they visit meat or are instead looking for protein. Although most bees use pollen for protein, three species have switched over to a carrion-only diet, so this hypothesis is not unreasonable. What did we find? That six different species of stingless bees foraged on our baits and that they *do* have preferences: for un-soaked chicken and sodium but not for magnesium, potassium, or calcium. So, they likely visit meat for both salts and supplemental protein, and this was confirmed in our observations of Trigona fuscipennis workers flying off with pollen baskets full of meat!

Stingless bees foraging for minerals on a sodium-soaked carrion bait. Like honey bees, stingless bees recruit workers to resources, so it’s likely that all of these bees are from one colony.

Orchid bees: If you wander the forests of Costa Rica long enough, you’ll likely see a metallic green flash, darting between the trees in search of flowers. These are orchid bees of the genus Euglossa, which are among the most dramatically colored bees in the world, coming in iridescent colors ranging from bright red to blue and even violet.

Orchid bees encompass over 200 species (many of them less colorful) and constitute the most important and abundant pollinator group in much of the New World tropics. The bees are known to fly up to 40-km in a day, an astounding distance that helps tropical plants mate while far apart. They also include some of the longest-tongued bees in the world, like the gorgeous specimen of Euglossa asarophora pictured below. That long thin line extending beyond its body is its tongue, which is long even for an orchid bee! You can see how this might come in handy for reaching in very deep flowers for sugary nectar.

Euglossa asarophora has an incredibly long tongue. Unlike most other bees, orchid bees suck rather than sip nectar, a behavior that prevents them from feeding on highly concentrated (and therefore viscous) nectar. PC: Atticus Murphy and Leslie Spencer.

But orchid bees are perhaps most famous for their intricate relationships with orchids, and their highly unusual scent collection behaviors. In an effort to attract a mate, male orchid bees spend much of their day roaming the forest in search of specific scents, often those produced by rare orchids. When they come across a desirable smell, the bees scoop the smell into a specialized organ on their hind legs, where it is stored. Some orchids have evolved to produce no rewards other than the particular scent that their specialist orchid bee pollinator likes best! This trait comes in handy for humans, too: by putting out synthetic perfume compounds, scientists can attract the male bees in order to study them (or take pictures like the one of the green Euglossa above).

Hummingbirds: Hummingbirds’ extravagant plumage and fascinating behaviors make them some of the most well-known non-insect pollinators. While only one or two hummingbird species can be found regularly in the United States east of the Mississippi River, Costa Rica hosts an astounding 50 species, ranging from the widespread Rufous-tailed Hummingbird that can be found visiting flowers on city rooftops to highlands specialties like the aptly-named mountain-gems. Like many other groups of pollinators, hummingbirds include both generalists and specialists. Some species, known as hermits, have strongly decurved bills that are well-suited for accessing the nectar of curved Heliconia flowers. Unlike many other hummingbirds, hermits are not territorial. Rather than defend flower patches, they instead visit plants scattered around the forest floor along fixed routes, a behavior known as traplining (also seen in other pollinators, such as orchid bees!). As they forage, hermits provide a valuable service for Heliconia by carrying their pollen over long distances, often to other individuals of the same species – a difficult feat to achieve for a plant growing at low densities in the understory of a tropical forest!

Rufous-tailed hummingbirds are common throughout the lowlands of Costa Rica. They aggressively defend patches of flowers from intruding hummingbirds. PC: Nick Dorian.

Although our trip taught us a lot, it also raised a lot of questions. For example, we don’t know what most orchid bees nests look like, what sorts of microbes help stingless bees digest meat-based protein, and what will happen to mountain-gems as the tops of mountains warm. We’ll just have to wait until next time to go back to the tropics to do the science and find out!