Lake Darner – OdoNotations

Marlborough Forest in the Drought

The drought this summer has been awful – we’ve had less precipitation than normal every month from May through September, and not only are ponds and creeks drying up, but people’s wells are running dry. Ottawa received 48 mm of rain in July, (typical average: 88 mm), 48.2 mm of rain in August (typical average: 79 mm), and 32 mm so far in September (typical average: 90 mm) with still no rain in the forecast. A visit to Richmond Lagoons revealed only a puddle of water in the middle cell – the one which normally has the most water – and the Jock River behind the former sewage lagoons had been reduced to a trickle of water. Meanwhile, Bruce Pit has a large sandy shore which has made it impossible to find odonates that like to perch on emergent plants and stems. I went to Roger’s Pond on September 14th expecting more of the same, but was still shocked by how very little water was present.

The Flood Road Fawn Darner

Earlier this year I spent some time exploring the creeks of Kanata in an attempt to find some of the creek-loving odonates that inhabit Gatineau Park on this side of the Ottawa River. While I was happy to find new places for damselflies such as Aurora Damsel, Ebony Jewelwing and River Jewelwing, I wasn’t able to find any creek-loving clubtails, darners or spiketails. One place that intrigued me was Brassils Creek in Marlborough Forest. It meanders through a large portion of the forest, though it is wide and marshy in most places where the trails cross it, with a slow-moving current similar to the Jock River. Google maps shows that this creek passes beneath Flood Road just off of Upper Dwyer Hill Road, and on July 12th I spent an hour exploring the area to assess its potential for odes.

The 2025 Odolympics

I was quite happy when I learned that this year’s North American Odolympics were to take place in mid-August this year. This would be my third year participating; the 2023 Odolympics ran from August 19-27 while the 2024 Odolympics ran from September 7-15, so I was worried that this year’s bioblitz would be held in October! However, with a start date of August 16th (and running till August 24th) it would be my earliest bioblitz yet!

Unfortunately there was one problem with that date: I would be driving to Nova Scotia with my partner and three cats during the entire first weekend! Then came the second blow: while I was excited to participate in my first Nova Scotia Odolympics, a forest fire was burning out of control in Annapolis County (not too far from where our trailer is located); the fire risk was extremely high all throughout the province due to the prolonged drought conditions; and the government had closed the woods to recreational activities, including trails in provincial and national parks. The reason for the closure was to prevent additional human-caused forest fires, which meant hiking, camping, fishing, and driving recreational vehicles on both Crown and private property were all prohibited. This decision was based on the amount of dry, flammable material present which could easily start a fire, and the fine for violating the ban was $25,000. Immediately my dreams of looking for odes along forest creeks – which were already terribly low from a lack of summer rainfall – were dashed, and even places like Miner’s Marsh were out of the question as the marsh had entirely dried up, leaving the dry, cracked muddy bottom completely exposed.

The 2024 Summer Odolympics

The 2024 North American edition of the Summer Odolympics were held between September 7-15, giving ode enthusiasts two weekends and as much time as a regular working week would allow to collect observations. I had hoped to find 19 or 20 species based on the same period spent collecting observations last year, but as most species are on the decline by this time, I knew I needed both good weather and good luck to come up with a respectful number. Unfortunately, neither luck nor weather were in my favour that first crucial weekend when I hoped to find a few species whose season ended around the beginning of September; it rained most of Saturday, and the temperature never rose above 15°C. Although it didn’t rain nearly as much on Sunday, the weather was worse: it was cloudy, windy, and the temperature never rose above 14°C. In fact, it was the coldest September 8th in more than 70 years (since 1949) and the windiest since records began in 1953 with a mean wind of 21 km/h. With a 1:00am windchill of 1.6 it was almost (within 0.1) the lowest windchill ever recorded on September 7th. Cold, wet, windy nights are even more of an obstacle, as many late-lingering species may not survive the low temperatures. When the sun began peeking out from the thick, fast-moving clouds around 4:30 I headed out despite the wind as to have zero species recorded on the first weekend was unthinkable. I didn’t expect much, and found only two species at the Eagleson ponds: an Eastern Forktail and a Slender Spreadwing.

Next Gen Dragon-hunters

After I returned from my visit to southern Ontario I still had bugs on the brain, specifically odonates. Now that September has arrived the days will be getting shorter and the nights cooler, which spells the end of the season for a number of different species. It is, however, prime time for darners, and I still had yet to find a Lake Darner or Green-striped Darner this year. I also haven’t seen any Saffron-winged Meadowhawks either, another species that peaks in August and early September, despite searching known locations at the Eagleson storm water ponds. While I knew that bird migration was heating up, my brain hasn’t yet made the switch from odes to birds. I am having trouble getting up early enough to get out for my regular birding walks before work, and I won’t even consider putting my net away while the weather is still nice – I want to wring every last sunny moment looking for dragonflies and damselflies before taking the mandatory six-month winter hiatus. This has never happened to me before, and while I still am using eBird to keep track of what I see, most of my checklists are incidental ones noting only a few species that caught my attention while out later in the day dragonfly-hunting.

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.

September Odes – A Summary

By the time September rolls around, most odonate species are done for the year in the Ottawa region – gone are the Aurora Damsels and Elegant Spreawings, the Spiny Baskettails and Ebony Boghaunters, the Arrowhead Spiketails and Horned Clubtails, the Chalk-fronted Corporals and Four-spotted Skimmers. This is the time of year when the number of meadowhawks and darners begin to peak, and southern species such as Spot-winged and Wandering Gliders may blow into our region with the warm south winds. A few bluet and spreadwing species may persist, as well as the common and widespread Eastern Forktail, though each day sees fewer and fewer individuals. This is a summary of species I saw and photographed around Ottawa during September 2019 – due to my trip to Edmonton and some cool, cloudy weekends, I didn’t visit as many places as I had hoped and missed a few common species.

A Lake Darner in Ottawa

On August 27th, the last Saturday of the month, I headed out to a spot I normally don’t visit so late in the summer – Roger’s Pond along the Cedar Grove Nature Trail. I usually go in May and June when early-season dragonflies are flying, such as the locally rare Ebony Boghaunter, the uncommon Harlequin Darner and Brush-tipped Emerald, as well as the usual whitefaces, Racket-tailed Emeralds, Spiny and Beaverpond Baskettails, and Aurora Damsels. I had two reasons for wanting to go: the first was the Band-winged Meadowhawk, a species I had seen in good numbers here on one late-summer visit several years ago but have had trouble finding recently, and the second was a yearning to find some Aeshna darners. After seeing such a good variety at my Dad’s trailer and failing to find the Variable Darner at Bruce Pit, I thought that Roger’s Pond might be a good spot to look for Ottawa’s common and uncommon species.