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Botany

Botany

05/03/18

Why a strawberry isn’t a fruit (sort of)

I was watching an old episode of “The Big Bang Theory” and Sheldon asked Penny what her favorite fruit was. Penny said “strawberries” to which Sheldon replied “technically NOT a fruit”. My daughter turned to me and asked “is that true” and I said “yes, sort of.” Let me explain why.

Plants have sex. The evidence of their many dalliances lands on our lawns and patio furniture in the form of pollen in the spring and later on in the year as spores, seeds and fruits. What’s the difference between these structures? Well, pollen is like sperm in a tiny ping pong ball, a spore is like a naked baby, a seed is like a naked baby with a bottle and a fruit is like a baby with a bottle wearing clothes (or sometimes even driving a vehicle). So at this point you’re probably thinking “eeww, I've touched that stuff” but let’s cut plants some slack cause if they didn’t have sex, they’d go extinct and that would be bad for us given that we can’t photosynthesize!

Ostrich ferns (Matteucia struthiopteris) aren't the best botanical parents.

Spore-producing plants, including mosses and ferns, are terrible parents: they just abandon their children to the whims of fate with nothing to eat and not a stitch on their backs! Cone-bearing plants (=gymnosperms) like spruces, pines, and junipers, are better parents as they provide their babies with something to eat. Giving their babies a source of food enables these plants to grow in drier, less fertile habitats than spore-producing plants can. However, as their babies are “naked” with no protective covering, they are vulnerable to thieves that want to steal their “bottle”: animals!

Conifers like this pine (Pinus) provide their babies with food.

Flowering plants (=angiosperms) include most of the plants we are familiar with: grains, fruit trees and yes, strawberries! These species don’t let their children go out without a snack and a coat on. However, not all fruits are fleshy and edible as we are accustomed to think. Nuts are actually a type of fruit with a hard shell to protect the baby from hungry animals, kind of like a tank. Grasses give their babies clothing that sticks to their bodies and won’t come off. Maple trees give their kids hang gliders to help them soar away from their parent on the wind!

Manitoba Maples (Acer negundo) provide their children with a vehicle. From Wikimedia Commons

There are a variety of fleshy fruits as well. A berry is a multi-seeded fruit that includes some plants that we call berries, like blueberries and Saskatoon berries, but also some that we don’t think of as berries, like grapes and tomatoes. Raspberries and blackberries on the other hand, are not true berries, they are aggregate fruits: basically a bunch of tiny fruits clustered together on the enlarged tip of the flower stalk. Stone fruits have a single, hard seed (=drupe) inside; they include peaches, plums and cherries. Citrus fruits are berries with a tough, leathery rind called a hesperidium. These fruits, according to Sheldon are “true” fruits.

Raspberries (Rubus pubescens) aren't berries: they are aggregate fruits.

Many of the others things we call fruits actually consist of both the fruit AND parts of the flower petals. The fleshy part of apples and pears (=pome) that we eat is not actually the fruit; those are enlarged fleshy petals. Only the “core” of an apple is actually the fruit. The fleshy part of a strawberry is actually formed from the enlarged base of the flower stalk called a receptacle. Each of the “seeds” on the outside of a strawberry are actually one-seeded fruits with a thin, dry covering called an achene. So when you eat a strawberry you ARE eating the fruits of the plant, but it isn’t the part you think it is. For this reason, botanists call these types of fruits “accessory” fruits. Regardless of what part you eat though, there is one thing that is indisputable: fruits are one of the best things you can put into your body. Enjoy strawberry season everyone!

The fleshy part of a strawberry is actually an enlarged flower stalk. The things on them we call "seeds" are actually the fruits.

04/09/18

WATCH OUT FOR WATER-LILIES!

Water-lilies (Nymphaea spp.) have the largest flowers of all Manitoba plants. Unfortunately, because they grow in deep water, the only time you can usually see these lovely flowers close up is when you are in a boat. For this reason, botanists who specialize in water-lilies are a unique breed because they spend a lot of time jumping into lakes and rivers to get good specimens. The distribution of water-lilies in Manitoba is poorly known due to the huge number of lakes and rivers we have here, as well as their inaccessibility. At the Manitoba Museum there are only 64 specimens of water-lilies of any kind in our collection.

Water-lilies (Nymphaea spp.) are typically found in fairly deep water in clear lakes and rivers.

Manitoba has four water-lily species, three of which are thought to be rare due to the limited number of specimens in Canada’s herbaria. Images and descriptions of each species, in order of decreasing size, is written below to help you identify them as you explore our province this summer.

Fragrant Water-lily (Nymphaea odorata)
This rare species, found only in southeastern Manitoba, has the largest flowers of all our water lilies: 6 to 19 cm across with 17-43 petals. The leaves are also quite large: about 10-40 cm in diameter. The innermost floral parts (the carpels) are bright yellow in colour and 3-10 mm long. The best place to see this species is in Lily Pond Lake in Whiteshell Provincial Park when it flowers in July.

Fragrant Water-lily (Nymphaea odorata) has the largest flowers of all our native water-lilies.

 

Lori’s Water-lily (Nymphaea loriana)
This species is rare, endemic to Canada, and has only been found north of Lake Winnipeg in clean, clear (not cloudy or tannic) water, and in eastern Saskatchewan. The flowers are slightly smaller than that of Fragrant Water-lily: 7.5-10 cm in diameter with 8-21 petals. The innermost floral parts (the carpels) are deep yellow in colour (kind of like the yolk from a free-range egg) and only 2-3 mm long. The leaves are 8-21 cm in diameter and green underneath and on top.

Lori's Water-lily (Nymphaea loriana) is a newly discovered species found only in Canada.

The picture below compares the leaf undersides of Lori's, Dwarf and Pygmy Water-lilies.  Note the differences in both size and colour of the the leaf undersides.

Lori's Water-lily (Nymphaea loriana) is on the far left, Dwarf Water-lily (N. leibergii) is in the middle and Pygmy Water-lily (N. tetragona) is on the far right.

 

Dwarf Water-lily (Nymphaea leibergii)
This is the most common species in Manitoba, occurring in ponds, lakes and quiet streams throughout our southern Boreal Forest. The flowers are small, about 3-7.5 cm in diameter with 8-17 petals. The carpels are pale yellow but only up to 1.5 mm long. The leaves are about 2-19 cm in diameter and are typically a deep purple colour underneath.

Dwarf water-lily (Nymphaea leibergii) is relatively common in northern Manitoba.

Pygmy Water-lily (Nymphaea tetragona)
This species is also relatively rare, occurring sporadically in our Boreal Forest. The key distinguishing characters of Pygmy Water-lily are its small size, bright, purple stigma at the very center of the flower, and the square-shaped floral base. All other water-lilies have a yellow stigma and a rounded floral base. The flowers are similar in size and petal number to Dwarf Water-lily. The leaves are typically 2-13 cm in diameter and are often green, mottled with purple on top, and shiny and green underneath.

The rare Pygmy Water-lily (Nymphaea tetragona) has a distinctive purplish stigma.

Sometimes Dwarf and Pygmy Water-lilies hybridize to form unusually large plants. These hybrids have squared flower bases and large leaves with a purplish underside.

Pygmy water-lily (Nymphaea tetragona) is on the far left, Dwarf Water-lily (N. leibergii) on the far right and a hybrid between the two is in the middle.

Water-lilies are often confused with pond lilies (Nuphar spp.). However, pond-lilies have bright yellow flowers that smell a bit like mango and oval leaves with feather-like veins. Water-lilies have round leaves with all the veins arising from the center of the leaf, like the palm of your hand.

Pond-lilies (Nuphar spp.) have bright yellow flowers that smell like mango!

Pond-lily (Nuphar spp.) leaves are oval, not round and have feather-like veins.

The veins of round Water-lily (Nymphaea spp.) leaves all arise from the center.

If you’re out on a boat in one of Manitoba’s many lakes this July or August and you see a water-lily, take a picture and send it to me (drobson@manitobamuseum.ca) along with the location where you found it to help improve our knowledge of these species.  Don't forget to flip a leaf over and take a picture of that too!

03/05/18

The art and science of diorama making part 2: The illusion of reality

Most of the plants in the Museums’ dioramas are real plants that have been preserved and often painted. However, in some cases the preserved plants can simply not be used. This is especially true if the diorama is set in spring (e.g. wolf diorama in the Boreal Forest Gallery) or summer (e.g. bog diorama in the Boreal Forest gallery). In such cases, we make our own plants.

This marsh marigold (Caltha palustris) in the wolf diorama is completely fake.

The process required to create a realistic fake plant is a long and laborious one. The first step is to actually obtain a real, live plant of the species that you want to reproduce. First off, a location as close to the Museum as possible that contains the species required is identified. Then, landowner permission or government collecting permits are obtained. When the plant is at the right stage of flowering, a field trip to collect it is planned, usually first thing in the morning. An appropriately sized plant is chosen, and photographs and notes on the colour are taken. Then, the entire plant, along with a good chunk of sod, is dug out, placed in a bucket, watered to keep it from wilting too much, and driven to the Museum. This is the phase of the project that I, as the Curator, are typically involved with.

Models like this yellow lady's slipper (Cypripedium calceolus) are made by taking molds of real plant parts..

The remainder of the work is now with the Diorama Artist. She removes each part of the plant and makes molds of them. Then the molds are used to create fake leaves, stems and flowers or fruits. The fake parts must all be painted to the correct colour and then attached together using glue and wire in the correct way. It’s kind of like building a complex 3D puzzle. When the model is complete it is almost indistinguishable from a real one. I’d love to do a field trip where I would place the model in a real ecosystem and then see if anyone could actually find it. I’m pretty sure the Diorama Artist would kill me if I did that though (what if we couldn’t find it again!). Right now, several completed plant models are waiting in storage or on temporary display, for eventual installation in our new exhibits.

This Small White Lady's-slipper (Cypripedium candidum) model is on temporary display until a new exhibit case is ready.

The mini dioramas in the Museum are even more challenging than the full scale ones because you can’t use real plants in the same way. Although real branches are used for the trees, they have to be coated with wax, carved and painted to look like a real tree in miniature. Creating leaves and branches is even more difficult. In the Duck Bay mini diorama in the Parklands Gallery, the Diorama Artist used stair-step moss (Hylocomnium) as the branches of spruce (Picea glauca) trees. Baby’s breath (Gypsophila), a non-native plant used extensively in the cut flower industry, was used to create the leaves of the deciduous trees and the shrubs along the forest floor.

Moss and tree branches were used to make these mini-trees in the Duck Bay diorama.

The Manitoba Museum prides itself on the quality of our dioramas. Every time I look at them I see some new detail that I never saw before. The next time you come to the Museum, pay close attention to the plants in the dioramas and see if you can tell, what’s real and what’s not. You will gain a new appreciation of the talent and patience of our dedicated team of staff and volunteers.

02/12/18

The art and science of diorama making, part 1: Perfectly imperfect

When people come to the Museum and see our dioramas they are usually impressed with the majestic, taxidermied animals in them. But what they really ought to be impressed with are the plants. I find it amazing that the trees in the elk diorama are perpetually in the process of shedding their leaves.

The leaves on these aspen (Populus tremuloides) trees never fall off because they are glued on.

Anyone familiar with Manitoba’s forests and prairies, know that the plant species in our dioramas are the same ones that occur in the wild. That’s because, for the most part, they ARE real specimens. Although fake plants are readily available in stores, they are almost all tropical species that don’t occur in Manitoba. Further, mass-produced fake plants are usually too perfect to be entirely realistic. Nature is not perfect. Every animal (including you) and every plant is imperfect with discolorations and asymmetrical features. Real spruce and pine trees never look as perfect as artificial Christmas trees.

You won't find any pitcherplant (Sarracenia purpurea) models at Home Depot! That's why we have to make them ourselves!

To create our dioramas, real plants and fungi were identified and collected from natural areas (with permission from the landowner of course) and then pickled, glued and preserved in various ways. This preservation process, which takes many months to do, is essential to make it look like the plants are still alive; taking short cuts would destroy the illusion that you are in a real place. There are various problems that have to be overcome to ensure that our plants look right. For one, wood has a tendency to dry out and crack when you bring it into a building. That is why we have to pickle our trees to prevent this from happening. Another thing that happens when you bring a tree into a building is that the leaves fall off, unless it is in a pot and being watered. To prevent our leaves from falling off, special glues are applied to ensure they stay attached. We also need to make sure that the “floor” of the diorama looks real. We do this by attaching pieces of real sod to Styrofoam blocks that can easily be installed, removed and repaired.

This piece of sod from the Ukrainian Rye Farm diorama in the Parklands Gallery was temporarily removed for maintenance.

Anyone who has seen a dead plant knows that it turns brown as it dries out. So why are some of our diorama plants still green? The answer is paint: lots and lots of paint. That, and the infinite patience of a host of leaf-painting volunteers. That’s right someone painted every single one of the tree leaves in our dioramas, as well as many shrub, moss and grass leaves too. To make sure that the plants were painted the right colour, the Diorama Artist closely examined all the plants while they were alive, determined exactly which colour they were, and then blended paints to achieve the same colour. As painting plants is a lot of work, fall (e.g. elk diorama in the Parklands Gallery) and early spring (e.g. Bison diorama in the Orientation Gallery) dioramas are much easier to create because most of the vegetation is dead and brown at that time of the year anyway.

Every single leaf on the trees in our dioramas were hand painted!

But not all the parts of a plant or fungus can be dried and painted. Plants in summer scenes have to possess flowers and fruits but these structures usually look terrible when they are dried out. So what do we do in those situations? In my next blog I will describe the process used to create plants from scratch.

01/22/18

Museum’s Charlie Brown Tree Gets “Spruced Up”

This January what I like to call the Museum’s “Charlie Brown Christmas Tree” in the Arctic/Subarctic gallery, got polished up with some new paint and a new background. It’s still lopsided as ever (it did grow in the arctic after all) but now it has some friends in the background. This often missed mini-diorama is about Manitoba’s treeline: the part of the province where trees start to disappear.

The treeline exhibit with the old background. (c) MM

 

The black spruce (Picea mariana) tree in the diorama is known as a “krummholz”, a German word that means “crooked wood”. Krummholz trees grow in environments that are extremely difficult to survive in, including the far north and the tops of mountains. The trees in Manitoba’s north are subjected to strong winds that blow snow and ice around, which tends to kill the buds on the windward (northern) sides of the trees. The buds that do survive tend to be lower down on the tree, where they are protected by snow in the winter or on the southern side of the branch where it is marginally less nasty. This gives the trees their unique, flag-like appearance.

The "spruced up" tree with a new background. (c) MM

Woody plants in the far north grow very slowly due to the short growing season and poor fertility of the soil. This is why, despite the small size of krummholz trees, they are often quite old. A tree only four or five centimeters in diameter could be over 50 years old! The same tree species growing near Winnipeg would likely be at least ten times as large.

As part of a project to add new murals to the oldest galleries, the wall behind the tree was repainted and covered with a mural of other krummholz trees in northern Manitoba. The little tree was then given a good dusting, fresh paint on some of its needles and some new plants at the base by our diorama artist. It is the first of several murals in the Arctic/Subarctic and Boreal Forest Galleries that will be added soon.

12/06/17

Oh no, mistletoe

Although Christmas is considered to be a “Christian” holiday, many of the rituals we associate with it, such as kissing under mistletoe, are actually pagan in origin. European mistletoe (Viscum album) was considered to be a magical plant by Druidic priests because it mysteriously grew on the branches of trees without its roots reaching the soil. Further, it stayed green in winter, and produced its berries in November and December when other plants were going dormant. Druidic priests collected mistletoe from oak trees to hang in homes in the hopes that it would ward off evil. The custom of kissing under it might have grown from a Scandinavian myth regard Baldur, the god of peace (Foster and Johnson, 2006). The myth states that Baldur was slain by an arrow made of mistletoe but then brought back to life. To commemorate this resurrection, mistletoe was given to the goddess of love, who declared that anyone passing under it should receive a kiss so that the plant would be associated with love not death.

European mistletoe (Viscum album) growing on its host tree, an apple (Pyrus sp.). From Wikimedia Commons

In reality European mistletoes’ seemingly magical appearance is actually due to the fact that it is a semi-parasitic plant on coniferous and deciduous trees. This means that while it has leaves that can photosynthesize its own sugars, it steals water and minerals from a host plant. It is known to infect about 200 different tree species! European mistletoe berries are an important source of food for birds (they are poisonous to people though), which disperse the seeds throughout the forest in their feces and by rubbing the sticky seeds off their beaks. Seeds that land on the branches of trees will germinate there, producing a special root that penetrates through the bark so it can tap into the trees’ sap. Trees infected with European mistletoe are weakened but not usually killed by it. Oak mistletoe (Phoradendron leucarpum), grows in the eastern parts of the United States and Mexico. It is very similar in appearance to European mistletoe but only infects deciduous trees. Oak mistletoe is the species that you can buy fresh in some parts of Canada at Christmas time, although it is not native here.

American dwarf mistletoe (Arceuthobium americanum) growing on a pine tree. From Wikimedia Commons.

Manitoba has two species of mistletoe: American dwarf (Arceuthobium americanum) and dwarf mistletoe (A. pusillum). Unlike European and oak mistletoe, these species are complete parasites so they do not produce any green leaves. For this reason they are not particularly attractive, consisting mainly of yellowish-green stems with tiny flowers that mature into bluish berries. The fruits of Manitoba’s mistletoes explosively eject their seeds at speeds up to 80 km/hour, travelling up to 18 metres away from the parent plant. Since the seeds are coated in sticky mucilage, they will adhere to whatever surface they hit, potentially infecting another tree. As these species cause “witches’ brooms” on the conifer trees that they parasitize (usually spruce or pine), and eventually cause tree death, they are not looked upon fondly by foresters. Trees infected with mistletoe become deformed, and are less useful for commercial timber.

Herbarium specimen of a Jack pine (Pinus banksiana) tree infected with dwarf mistletoe (Arceuthobium americanum). TMM

Regardless of whether you love or hate mistletoe, you have to admit that they are among the world’s most interesting and unusual plants.

Reference
Foster, S. and R.L. Johnson. 2006. Desk reference to nature’s medicine. National Geographic, Washington, D.C.

11/01/17

WHY I KNOW NOTHING ABOUT HOUSEPLANTS

When people find out I’m a botanist they always start asking me about their houseplants. Unfortunately, I really don’t know much about houseplants as they are pretty much all tropical or desert plants, not native species, which is where my expertise lies. Not wanting to seem rude by saying “how should I know what’s wrong with your stupid Ficus”, I began thinking about the things I could say using my knowledge about plant ecology. The best advice I was able to come up with is to learn about where your houseplant comes from originally and use that information to adjust how you treat your plant. In this spirit, here is some good general advice. Obviously, the best advice to follow is the instructions on that little tag that comes with the plant. But if you’ve lost the tag and don’t know what species is, there are a few things the plant can tell you about itself.

Jade plant (Crassula ovata) is a succulent that does not like to be overwatered.

1. Thick, fleshy leaved plants
Plants with thick, fleshy leaves or stems and spines, are succulents. This means they are probably adapted to dry, desert environments where they might go without rain for months at a time. When it does rain, the plants suck up the water quickly, often storing it as a kind of gel. These plants thrive on neglect and are excellent if you travel a lot as you can leave them for weeks at a time without watering them. In fact, overwatering can kill them, as can the way you water them. Succulents don’t like their “feet” (i.e. roots) wet for very long. To water a succulent properly, wait until the leaves/stems get wrinkly-this means they are using their stored water to live. Place your pot in a sink, shower or bathtub, pour in a whole bunch of lukewarm water and let it drain through the hole in the bottom overnight (DON’T use a pot with a water tray at the bottom). I water my succulent pot only about once a month. Also succulents love sun so they typically need a southern-facing window to be happy.

Examples: Century plant (Agave), aloes (Aloe), jade plant (Crassula), Euphorbia (Euphorbia), burrow’s tail (Sedum), and cactuses

Peace lilies (Spathiphyllum) will tolerate low light. From Wikimedia Commons.

2. Wide, dark green, thin-leaved plants
Plants with wide, dark leaves tend to be forest floor dwellers, vines or tropical bromeliads. Since very little light penetrates to the forest floor they need big leaves to intercept enough light. Putting such a plant in a hot, southern window will probably make it miserable as it will get the botanical equivalent of sunburn. They may drop their leaves and grow newer, smaller, paler ones in response to these conditions. These types of plants typically do OK in northern-facing windows or indirect light. They generally also hate drying out so they should be watered fairly frequently to keep the soil damp. A word of caution: some of these plants like humid conditions and may not grow well in a dry house; they might be happier in a terrarium or near a humidifier.

Examples: Chinese evergreen (Agalonema), cast-iron plant (Aspidistra), pothos (Epipremnum), Chinese fan palm (Livistona), peace lily (Spathiphyllum), bromeliads, ferns and many orchids

Spider plants (Chlorophytum comosum) like it a bit sunny. From Wikimedia Commons.

3. Narrow, pale green or silvery-leaved plants
Plants with narrow leaves are often from sunny, somewhat dry habitats like savannas, grasslands and open forests. They generally prefer east, west or south-facing windows and may do OK with indirect light. Unlike succulents, they typically need moister soil conditions although they will still need good drainage.

Examples: Spider plant (Chlorophytum), umbrella plant (Cyperus), dragon plant (Dracena), date palm (Phoenix), yuccas (Yucca)

That’s about all I know about houseplants. Good luck not killing yours!

09/20/17

What a difference a year makes

One of the first papers on pollination I tried to publish got rejected because I had data from only one field season. So I withdrew the paper and did another year of research. But why is having two years of data so important? It is mainly because the world is a messy place.

The summer blooming showy goldenrod (Solidago nemoralis), here being visited by a bee fly, was less abundant than the spring blooming flowers.

This year I conducted a second year of pollinator surveys at the Yellow Quill Prairie Preserve. One thing I learned was that the flowering season starts much earlier than I had anticipated. Initially I thought August would be the month with the most flowers blooming but now I know that May has more due to the abundance of common chickweed (Cerastium arvense) and three-flowered avens (Geum triflorum). Further, there were several plants that I did not think were particularly attractive to pollinators. In 2016 I observed only a few pollinators visiting gaillardia (Gaillardia aristata), and concluded that it was probably an unimportant plant. However, in 2017, I observed this plant at peak bloom and, after averaging the data, discovered that it was actually one of the most frequently visited plants. So without two years’ worth of data, the importance of some species would have been underestimated.

At Yellow Quill Prairie, common chickweed (Cerastium arvense) and three-flowered avens (Geum triflorum) were abundant in May.

When looking at data is important to understand what the word “average” really means; it can be a bit misleading because it implies that most things are the same. In fact, it could mean that things are usually different. Take something like the number of times pollinators visit a group of plants. If I say the average number of visits per hour is 18 you would think that means you would typically see three visits every ten minutes all summer long. But that’s not what happens at all. On cool, windy days I sometimes saw less than one visit every hour. On warm days however, 25 to 50 visits an hour was typical. So the average is actually the number in between these extremes and not really representative of what you would see on any given day. Only by collecting lots of data over long periods of time can you really get a good idea of what is going on in an ecosystem.

I finally saw bumblebees visiting Gaillardia (Gaillardia aristata) in 2017.

So why do we see such extreme fluctuations in nature? Certainly the weather, time of year, land usage and life cycles affect plants and pollinators but there are also other factors that we just don’t entirely understand. In fact, ecologists rarely expect to find a reason for all the variability they observe in a system. Long-term and multi-year studies are valuable because they help us see beyond the noise of the data. An accurate picture of how ecosystems work, and might adapt to environmental changes, cannot be assessed without this type of research.

This research is made possible by funding from the Nature Conservancy of Canada and the Manitoba Museum Foundation.

07/12/17

I always feel like something is watching me

Usually when I do field work I’m by myself. But sometimes I get the feeling that I’m being watched. The main things that have been watching me this year are the cows. The Yellow Quill Prairie Preserve, owned by the Nature Conservancy of Canada, is sustainably grazed by a herd of cows. Aside from using some of my plot stakes as scratching posts and knocking them down, they generally leave me alone and I leave them alone. Sometimes, though, they get a little curious and stare at me with those slightly vacant eyes as if they are expecting me to do something spectacular, and that’s when I start to feel a bit self-conscious. I have no idea what sorts of entertainment a cow would enjoy. Sometimes I moo at them just to see what they’ll do, which is usually nothing. Sometimes they moo back though and then I wonder exactly what was it I said. Where’s Dr. Dolittle when you need him?

The curious cows at the Yellow Quill Prairie Preserve like to stare at me.

I’ve also been looked over quite thoroughly by the resident Upland Sandpiper. Usually it just chatters at me but last week it flew over a couple times and then landed in the grass and started walking in a circle around my plot for a couple of minutes. It kept peeking out from behind the grass like it thought I was up to no good. Although I would have loved to get a good picture of it, it was just too sneaky and all I got was photo of it as it flew away.

This Upland Sandpiper kept stalking me!

Mammals and birds aren’t the only wary creatures at the preserve. A beautiful Tiger Swallowtail (Papilio glaucus) was there, feeding on the Purple Locoweed (Oxytropis lambertii) but, like most butterflies, it did not want me to take its' picture. Neither did a Hummingbird Clearwing Moth (Hemaris sp.). Those insects are so fast (like a hummingbird) that they are almost impossible to photograph. I did get one very blurry shot in before I could adjust my camera to “action mode” but by then it was gone. Maybe one day I’ll manage to take a decent photo of one.

This jittery Tiger Swallowtail (Papilio glaucus), seen here feeding on a Purple Locoweed (Oxytropis lambertii), was not very photogenic.

In general, insects that have no form of self-defence, like butterflies and moths, are less apt to let you get anywhere near them. Or maybe they think they’re just too sexy for my camera. The jitteriness of butterflies has likely resulted in a flaw in my field data: I don’t know a lot about what they are feeding on, or how frequently they do so, due to their reluctance to approach me. I try to stay as still as possible, but I suspect that my butterfly and moth observations are low for this reason. Maybe I should start wearing camouflage.

I just managed to snap a blurry picture of this Hummingbird Clearwing Moth (Hemaris sp.) on Purple Locoweed (Oxytropis lambertii) before it zoomed away.

The presence of all these suspicious animals is why my favorite animals on the prairies are the bumblebees (Bombus spp.). Bumblebees are so confident that you are not going to hurt them (due to their stingers) that they’ll let you stick a camera right in their face! As a result I have a plethora of bumblebee images and some really great visitation data. Yeah bumblebees!

A Bumblebee (Bombus sp.), seen feeding here on a Gaillardia (Gaillardia aristata) flower, is just too busy to care if you take its picture.

 

06/01/17

Spring has sprung

Once again I am studying pollinators at the Nature Conservancy’s Yellow Quill Prairie Preserve (http://www.natureconservancy.ca/en/where-we-work/manitoba/featured-projects/yellow_quill_prairie.html) just south of Canadian Forces Base Shilo. Last year I made the mistake of starting my field surveys too late and missed the blooming of a number of early flowering plants like prairie crocus (Anemone patens), three-flowered avens (Geum triflorum) and chickweed (Cerastium arvense). This year I did my first survey on May 11, which was already almost too late for the crocuses but just in time for the others.

Prairie crocus (Anemone patens) finished flowering in early May.

Spring is not the busiest time on the prairies as bee populations are not at their peak yet. However, it is a very important time because the queen bees start feeding. Bee queens are the only ones that survive the winter, going into hibernation in the soil. In spring, the hungry queens begin feeding on both pollen and nectar from the early blooming wildflowers. Once they have fattened up a bit, they select appropriate nesting sites and lay the eggs that will produce the first worker bees. Some queen bees brood their eggs, keeping them warm until they hatch. The workers typically start showing up in June.

Queen bumblebees often feed on three-flowered avens (Geum triflorum).

My task this May was to find out what the queens were feeding on. Bumblebees (Bombus spp.) were most fond of three-flowered avens with 61% of all visits being to that species followed by chickweed (25%). Andrenid bees (Andrena spp.), on the other hand, preferred the chickweed visiting it 95% of the time. The little sweat bees (Lasioglossum spp.) weren’t terribly abundant yet but only visited the chickweed. In fact, one day it was so windy that I didn’t see any sweat bees at all. If they had ventured out, they would have been incapable of flying without getting completely blown off course as the wind speed was almost 50 km/hour. The few big insects that were out (e.g. bumblebees, clearwing moths) were zooming past me very quickly, if they were going in the direction of the wind that is.

Streaks of pink and white at Yellow Quill Prairie represent three-flowered avens (Geum triflorum) and chickweed (Ceratium arvense) flowers in abundance.

Interestingly, I also saw domesticated honeybees (Apis mellifera), visiting three-flowered avens and chickweed in equal amounts. These honeybees are being kept by one of the nearby farmers and, since there are no crops in flower yet, they were out searching for something to eat. To me, this clearly demonstrates the value of prairie preserves. Although some consider wild prairies to be “waste land” because they aren’t being used to grow crops, they do provide us with benefits: they help pollinating insects survive and reproduce, are a safe place for nesting, and are a source of honey for us to eat.

Happily, except for the strong wind that one day, the weather was great during my surveys: sunny and warm. Hopefully my luck will hold out and I’ll have clear skies for my next field trip in early June.

Dr. Diana Robson

Curator of Botany

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Dr. Robson obtained a Master's Degree in Plant Ecology and a Ph.D. in Soil Science at the University of Saskatchewan. She has been working at the Manitoba Museum since 2003, conducting research mainly on rare plant and pollination ecology.