Gillian

Two new odes at the Eagleson Ponds

I wasn’t expecting to find a new species for the Eagleson storm water ponds when I went there this morning, let alone two; my main goal was to look for some Rainbow Bluets in the vegetation around the southern-most pond. My walk started normally enough, with the usual odonates perching in the vegetation: Taiga Bluets, Eastern Forktails, Sedge Sprites, and even a Fragile Forktail. I headed out onto the small spit of land where I used to see Saffron-winged Meadowhawks and Eastern Amberwings perching over the water before the sparse planting of cattails became a solid, impenetrable wall of vegetation. There was one dragonfly here, and I caught a glimpse of the black and white colours as it landed on the ground ahead of me. It was Chalk-fronted Corporal, and at first I thought nothing of it as I snapped a few photos for my iNaturalist project. After all, these dragons were not only common, but also abundant where they happened to emerge. It took me a moment to realize that although I see them quite regularly at Sarsaparilla Trail and in Marlborough Forest, I had never seen one here at the ponds before. It was a new species for my project!

I only saw one as I made my way around the southern-most pond, but then I didn’t have time to check any of the others. Would it be a one-time visitor, like the Racket-tailed Emerald of 2022 or the Violet Dancer of 2020? Or would more follow? I’d seen a noticeable decline in skimmer numbers over the last year or two, so new additions were definitely welcome. There are fewer Common Whitetails, Twelve-spotted Skimmers, Widow Skimmers, Eastern Pondhawks and Dot-tailed Whitefaces around the edges of the ponds than there used to be. While none of these had ever been truly abundant, I would usually see a few on most visits in appropriate weather. I suspect the large number of fish – particularly carp, which feed by disturbing the wetland floor and stirring up sediment containing dragonfly larvae – and growing number of frogs and toads are likely responsible for this decline, but have no evidence to support this theory.

I found some Rainbow Bluets in the vegetation right where I expected them – they seem to prefer the western side of the southern pond – and was reassured when I saw a Common Whitetail a little later, flying over the small J-shaped pond next to the rock bridge before landing on a bare patch of ground sloping down to the water. I was making my way around the pond back to my car, looking for pondhawks basking on the rocks when something black fluttered in the vegetation below me. When I identified it as a male River Jewelwing I was astonished, as this was a species I never expected to find here at the ponds.

River Jewelwings live along medium-sized streams and small rivers with a slow to moderate current and plenty of submergent vegetation. They prefer more open waterways with more sunlight than Ebony Jewelwings, though the two species are often found together along wooded streams. The closest places I’ve seen River Jewelwings are the stream at the back of Jack Pine Trail in Stony Swamp (which I call Spiketail Creek), and Stillwater Creek at Corkstown Road just east of Moodie Drive. The former was a one-time visitor, while the latter was seen during an exploratory excursion in 2015 with Chris Traynor after I saw one away from the water across the road in 2011.

There is a small channel of water that runs south from the Eagleson storm water pond system through farmland before reaching the Jock River at Terry Carisse Park. It has enough of a current to keep it open during mild winters, and I suppose it is just as likely that the River Jewelwing flew up the channel as it is that it flew or was blown south from Stillwater Creek. It’s a mystery as to where it came from and where it was going when it found the ponds, and I expect this to be a one-time visit rather than the harbinger of a new population of River Jewelwings at the ponds.

As I was photographing the jewelwing I saw two Common Green Darners fly by in tandem. This species is common at the ponds, and I usually see one or two patrolling the shoreline every visit in the first couple of months of the season. The pair stopped so the female could lay her eggs, inserting the tip of her abdomen into the water while still connected to the male:

It is always fun adding new species to my project, especially if they become permanent residents: the larger the number of residents, the healthier the ecosystem. Dragonflies and damselflies in particular are good bioindicators of water quality and the health of a wetland, as they require clean water in which to grow as larvae and survive to adulthood. Given that the purpose of the storm water ponds is to collect poor-quality runoff from the surface of the city streets, which often contains road salt, vehicle fluids, bacteria, fertilizers, pesticides and other pollutants, I had my doubts whether these ponds could support a vibrant population of dragonflies. However, with recent additions such as the Orange Bluet, Eastern Amberwing and Band-winged Meadowhawks, whose populations seem to be stable, it seems that the water quality is in fact high enough to allow these species to thrive.

My informal list stands at 35 species as of June 2023, which is the same number as the species recorded on the iNaturalist project, though with two differences: I don’t count the single record of Hagen’s Bluet which shows up there, as the photos do not show sufficient detail for me to identify it; and I do count Prince Baskettail which is not in iNaturalist, as I have seen many but have not been able to photograph or catch one. I don’t count the Northern/Sweetflag Spreadwings which I’ve seen but haven’t been able to catch, either, since identification requires a close view of the male’s claspers….all goals for future visits!

So what species will turn up here next? I’m thinking Powdered Dancer or Halloween Pennant are most likely, but with dragons and damsels one just never knows. As my mentor says, odes – just like birds! – have wings and can turn up anywhere!

Brush-tipped Emeralds in Marlborough

Family Corduliidae (the emeralds) is one of my favourite dragonfly families. My love for these green-eyed beauties grew when I started seeing a large number of Williamson’s Emeralds (Somatochlora williamsoni) in Stony Swamp in the summer of 2014; one particular day at the end of June stands out in my memory because I found a total of five emerald species at Jack Pine Trail in one visit (Common Baskettail, Prince Baskettail, Racket-tailed Emerald, Brush-tipped Emerald and Williamson’s Emerald). It was around that time that I realized that I didn’t have to wander too far from home to see such a fantastic variety of wildlife – Stony Swamp in particular is amazing, with the Eagleson storm water ponds close behind. I saw two Williamson’s Emeralds in Stony Swamp in 2018, then none in any subsequent years. The Brush-tipped Emerald population was still present as of last year, with one iNaturalist record (not mine) from Old Quarry Trail on July 1, 2022.

Spring Dragons

Sunny skies, a predicted high of 20°C, and a day off from work on the last Friday in May meant plans to visit Marlborough Forest for the first time this season with my mentor, Chris L. I had convinced her to come with me to trail E4 north of Roger Stevens Drive, home of the Ocellated Emerald, Ashy Clubtail, and Twin-spotted Spiketail – though it was too early for any of those to be flying yet. No less exciting were the possibilities for the early spring dragons that should be on the wing by now: Harlequin Darner, American Emerald, Ebony Boghaunter, and maybe a Springtime Darner or Stream Cruiser. We were sure to see plenty of whitefaces and other skimmers, some baskettails and a Dusky Clubtail or two, and some gossamer-winged butterflies to keep things interesting…the great thing about Marlborough Forest is that it is home to an amazing number of species not easily found in the city, so anything is possible!

The Morris Island Spring Bioblitz

Last year a particular OFNC outing caught my eye: a bioblitz to be held at the Morris Island Conservation Area on September 10th. Morris Island is a fantastic place for a bioblitz; the woodlands and wetlands of this 47-hectare site are home to a number of fascinating wildlife species, including several ode species not regularly found in my area of the city. I had never gone ode-hunting in September there before, as September is past the peak of ode season, with fewer species flying than in June or July. Still, it was a good chance to observe what was still flying there, and maybe find an unusual darner species or two. I attended with Chris T. and Chris L. and we photographed seven species for inclusion on the Morris Island Bioinventory Project on iNaturalist: Skimming Bluet, Eastern Forktail, Fragile Forktail, Powdered Dancer, Halloween Pennant, Autumn Meadowhawk, and White-faced Meadowhawk. So much for finding any cool darners!

The Emerald Mystery

On May 20th I received a photo of a large male emerald dragonfly from Chris Traynor. It was a teneral, with brown eyes and crisp, intact wings, but wasn’t so fresh that the wings had that glistening Saran-wrap look. The abdomen was long, thin and black, with an incomplete thin yellowish-white ring near the base. The message that accompanied the photograph was brief: “Don’t have my book. Any ideas?”

Odonates in Costa Rica

After completing cancer treatment last November and recovering from all but a few of the (mostly minor) side effects, I decided to celebrate by returning to Costa Rica in late April. We first visited it 2017 and I loved it so much I made a promise to myself to return. This seemed like a great time as I am finishing up my medical leave and head back to work in May. It is also the beginning of the rainy season when resort prices are a bit lower. I’d been checking flight prices since January, but post-pandemic prices are much higher than my previous trip – unfortunately I couldn’t find any discounts there. We originally planned to stay from Saturday to Saturday, but as it was cheaper to fly out on Friday we decided to do that instead, spending our first night at an eco-tourist lodge on the slope of Rincon de la Vieja volcano. The lodge was great, and I was disappointed we didn’t have time to visit national park it backed onto (Parque Nacional Rincón de la Vieja) before we left. I got a couple of life birds and butterflies, but saw only a couple of odes: a slightly tattered Black-winged Dragonlet and a couple of probable Wandering Gliders flying over the sun-dazzled parked cars in a small parking area.

The First Dragonfly of 2023

Dragonfly season (usually from mid-May to early November) is my favourite time of year. If the Victoria Day long weekend in May is warm and sunny, I’ll be out looking for the first emerging baskettails, whitefaces, and emeralds at some of my favourite spots in Stony Swamp or Mud Lake. I don’t usually see dragonflies before then since I’m busy working during the week, and weekend weather earlier in the month is not always conducive to dragon-hunting. Any dragonflies that I do see prior to the middle of the month are usually Common Green Darners that migrate here from further south. There was one year I found a migrant Common Green Darner at Hurdman Park in mid-April (April 19, 2011), but that is the exception rather than the rule. So when I visited a small pond along on NCC Trail 24 in Stony Swamp I wasn’t expecting to see anything other than the Wood Frogs I could hear calling from around the edges, and certainly not the tiny Spring Peepers with calls so loud you would swear they were right in front of you.

Identifying Green-striped and Lake Darners

Darner (genus Aeshna) season typically begins in July in the Ottawa-Gatineau region. The two most common mosaic darners, Lance-tipped and Canada, emerge early in the month, along with the slightly less common Shadow Darner. These three species are the most widespread members of this group, and if you see a mosaic darner flying along a forest trail or in an open clearing in the greenbelt it is most likely to be one of these. Lake Darner, Variable Darner, and Black-tipped Darner are considered “uncommon” in the Ottawa-Gatineau region, with the first being a localized species and the latter two species considered to be widespread. I suspect they may be easier to find on the Quebec side of the region, as there are more lakes and suitable bodies of water in Gatineau Park, and Black-tipped Darner has been relatively easy to find there. Finally, the Mottled Darner and Green-striped Darner are both considered “very rare”, with only a handful of records of each. I’ve been lucky to see a few Green-striped Darners in Stony Swamp in recent years, with one individual at Bruce Pit in September 2019 and two individuals at the Beaver Trail in September 2021. I’ve never seen a Mottled Darner, and hope to catch up with this species one day.

Damselflies in New Places

Damselflies are small odonates related to dragonflies, but belong to Order Zygoptera instead of Order Anisoptera. Unlike dragonflies, damselflies have very slender abdomens, and the forewing and hindwing are similar size and shape. Two of the three families found in eastern North America – the broad-winged damsels and pond damsels – hold their wings above the body, parallel to the abdomen, while perching. The third family – the spreadwings – do not perch horizontally with their wings parallel to the body, but typically “hang” from a perch, with the wings slightly spread at an angle. Adult damselflies are not strong fliers, and generally do not travel far from water. They are most often found in vegetation or on the ground near ponds, streams, and other bodies of water. Because of their small size they can be difficult to see, but the dark wings of the jewelwings and brightly coloured abdomens of some of the pond damsels help aid in observation.

Terry Carisse Park in the Summer

Most naturalists who have heard of Terry Carisse Park along the Jock River associate it with birds – particularly the Hooded Warbler that spent a few days there in May 2014. As a rare bird for Ottawa, this discovery put this small riparian park on the map for many Ottawa birders. Other people may associate it with the Osprey nest there, although the Osprey haven’t nested there for a few years now. I myself have returned regularly to this park in the spring and fall to look for the Rusty Blackbirds that often stop over here during migration – in May 2021 I found at least 50 of these declining birds feeding on the lawn and perched in the trees that line the river bank. Because of the thick shoreline vegetation, the wooded swamp to the north, and the open grassy areas dotted with conifers it is a good place to look for birds during migration. I had never been here during the summer breeding season, and it occurred to me this summer that it might be a good spot to look for odonates. I started my summer ode survey on July 2, 2022, continuing through early August, and found more species than I expected – including some species I’ve only seen at Petrie Island or Morris Island Conservation Area!

A Rare Dragonfly at Bruce Pit

Bruce Pit is under-valued as a great spot to see a variety of insects at the peak of summer. Though I’ve spent a lot of time looking for dragonflies there, it can be quite good for tiger beetles and butterflies as well, including Wild Indigo Duskywing, Gray Comma, Painted Lady, Compton Tortoiseshell, and migrating Monarchs. A visit anytime during the summer can usually turn up a few interesting species, and this year I started visiting on June 17th this year, hoping to find a few different insect species for my life list.

Marlborough Forest: Summer 2022

I did not get out to Marlborough Forest as often as I would have liked this past summer; ongoing medical issues early in the season left me feeling too tired and too sore for the long five-hour outings I enjoyed so much last year. On June 2nd I visited the E6 trail with Rick Collins to look for the Sedge Wrens breeding there. We heard one without too much difficulty, though we weren’t able to spot it. Our other highlight was a female Ruffed Grouse on the trail trying to lure us away from its chicks (none seen) by giving distress calls. It was a gray, drizzly day so I didn’t see any insects worth photographing. Indeed, I didn’t take my camera out of my bag at all.

The weather was much better on June 19th, so Chris Traynor and I went to trail E4 to look for Twin-spotted Spiketails and some different emerald species for his life list. I was also eager to show him the pool below the culvert as this was where I’d seen my one and only Ocellated Emerald hanging out in 2020. It was a bit windy, but the sun was shining and the weather was warm, and the breeze made the usual biting insects less of a distraction.

Identifying the Small Baskettails of Ottawa

On May 14th I wrote about a mass emergence of Spiny Baskettails at Mud Lake but didn’t explain much about how I identified them except to say my identification was based on the shape of the male claspers. Emerging dragonflies are pale and translucent, showing little to no colour of the mature adults they will become, but fortunately identification of the three small baskettail species in Ottawa does not depend the pattern of colours on its body (a fourth species, the Prince Baskettail, is much larger and has distinctive black spots at the base, tip and center of its wings). This post provides more detail about how to distinguish between the Common Baskettail, the Spiny Baskettail, and the Beaverpond Baskettail, three similar-looking species of the emerald family. While they are most likely to be found patrolling sunny woodland openings or grassy spaces next to water, they often perch on tree branches and plant stems at an angle, allowing good views or photographs.

Mass Emergence: Spiny Baskettails

By May 14th Ottawa had seen a string of six days with temperatures above 20°C, with the last three above 30°C. The warmth signaled the beginning of ode season, with my first dragonflies of the season – both Common Green Darners – seen at the Richmond Conservation Area (May 10) and Sarsaparilla Trail (May 11, 2022). Common Green Darners are migrants, however, arriving on the warm winds flowing from further south. The true ode season begins once it is warm enough for local dragonflies and damselflies to emerge from the rivers and wetlands in which their life cycle began. All odonates lay their eggs in water, and it takes time – from a few months to a few years – for the larvae to go through the individual stages of molting until they are large enough to begin the transformation from nymph to adult. When the nymph is ready, it crawls out of the water onto rocks, emergent vegetation, or nearby tree trunks or plant stems, and then bursts out of the larval shell through a hole in its back, using gravity to pull itself free. I have seen various dragonflies in the middle of this process a few times; I had never witnessed the full transformation as it takes a few hours for the dragonfly to become ready for its first flight. However, when I arrived at Mud Lake on a sunny day in mid-May hoping to find some warblers, it was a mass emergence of at least 50 individual dragonflies that engaged my attention, and I was able to observe many individuals at different points of the process.

The Last Dragonfly

By the time November arrives, all but the hardiest of insects have vanished, leaving only those few species that are adapted to the cold temperatures of mid-autumn in Canada. The last dragonfly on the wing here in Ottawa is the Autumn Meadowhawk, a small red or brownish dragonfly with very little black along the abdomen and yellow or brown legs. It is these two traits that make them easy to distinguish from other local meadowhawks – the other common species have distinct black markings on the abdomen and black legs. The most similar dragonfly in our area is the Saffron-winged Meadowhawk, which also lacks distinct black abdominal markings. However, the Saffron-winged Meadowhawk is larger, usually has a noticeable amber-coloured tint to the leading edge of its wings, and has black legs with brown stripes. In addition, most of the other meadowhawk species are gone by mid-October.