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Mar 07 2021

South Dakota Species Highlight: Chestnut-collared Longspur

Author: DakotaBirder • Discussion: No Comments

There are some species I instantly think of as being iconic northern Great Plains species when I hear the name. Marbled Godwit. Baird’s Sparrow. Lark Bunting. Greater Prairie Chicken. When I think of driving west and north from my home in far southeastern South Dakota, and heading to the central or western part of the state, away from the mosaic of corn and soybeans that dominates my area, I think of wide open grasslands, few people, and a unique ecosystem of iconic bird species. In my mind that also includes the Chestnut-collared Longspur, a gorgeous bird with a unique dark plumage (breeding plumage males) that I almost see when I heard the name, hanging out on a barbed wire fence with nothing but grassland for miles around.

Chestnut-collared Longspur - Calcarius ornatus Harding County, SOuth Dakota
Chestnut-collared Longspur from July 22nd, 2011 in Harding County, South Dakota. This. This is what I think of when I hear the name, a gorgeous breeding plumaged male Chestnut-collared Longspur hanging out on a barbed wire fence in a rolling grassland environment.

Yesterday I was processing bird photos (still a few years behind) and working on my website. I was working on a directory of photos I got last July in Hyde County, in the east-central part of the state, and got to one photo, and one photo only, of a Chestnut-collared Longspur. It’s not a great photo, and in fact, if it were another species where I had an abundance of photos, I might have thrown it out. I was shooting photos of shorebirds at a small wetland I’d stumbled across, when the lone longspur flew into my vision and plopped down to grab a quick drink. It was mid-day, the lighting was poor, but I grabbed a quick shot, surprised I’d seen one here, as I usually think of them as being a bird I’d find further to the east and north.

Then, as what tends to happen, I downloaded all the photos from that day, and they sat there unprocessed. I’d forgotten about that photo and encounter until processing photos yesterday, and knowing my collection of Chestnut-collared Longspur photos was sparse, I decided to keep the photo and work on the associated species pages on my website. As I was doing so, it brought to light just how rare an encounter the sighting was for me.

Chestnut-collared Longspur - Calcarius ornatus Hyde County, South Dakota
Chestnut-collared Longspur July 5th, 2020 Hyde County, South Dakota. One quick photo grab, and the bird was gone.

Two. TWO. That’s how many “decent” photos of the species I’ve managed to grab in South Dakota in the 21 years I’ve been birding. Despite my internal impression of the species as an iconic Northern Prairie species, both my actual sightings and photographs of the species have been extremely limited.

As I started working on my dedicated species page for the Chestnut-collared Longspur, I got to the “Conservation Status” section of the page and started doing some research, beefing up my current (very sparse) content. When I first created the page for the species some 20 years ago, there seemingly weren’t any worries about the status of the species. But when I looked at the IUCN (International Union for Conservation of Nature) web page on the conservation status of the species, it was immediately clear it was a species in trouble. The species has been downgraded in status twice in recent years as numbers have started to dwindle.

IUCN Redlist status for the Chestnut-collared Longspur.
From the IUCN page for the Chestnut-collared Longspur, a history of the official status of the species in their eyes. The species status has been downgraded twice in recent years, and numbers continue to decline.

It’s wasn’t a cheery exercise reading more about the status of the species. The Breeding Bird Survey (BBS) data, the gold standard for rigorous, systematic tracking of population trends over time, indicated a startling decline in the species of almost 90% from 1966 (Sauer et al. 2016). Other data sources show equally shocking declines, with estimates of >95% species loss in the Canadian portion of the Chestnut-collared Longspur range in less than 40 years, from 1971 to 2017 (COSEWIC 2019). A species that was once a common breeding bird in Nebraska, Kansas, and Minnesota has nearly been extirpated from those states, and previously robust populations elsewhere in its historical range are now gone. Clearly, it’s a species in serious trouble.

So what’s the cause of the trouble? Most sources agree that habitat loss is the primary factor in their decline. The Northern Great Plains used to be a mosaic of natural grasslands, wetlands, and riparian corridors with woodlands. Davis (2004) studied habitat needs for the Chestnut-collared Longspur and found that they required quite large, contiguous blocks of grassland to successfully breed. They avoided even what might be considered “prime” grassland habitat if the size of that grassland patch were anything less than 100 acres. With vast swaths of former Great Plains grassland converted to agricultural land uses in the last 150 years, grassland communities have been devastated, and remaining grassland patches have been heavily fragmented. In short, Chestnut-collared Longspurs can’t find enough suitable large patches of grassland on which to breed.

That downward spiral of suitable habitat continues currently, and in fact has recently intensified in parts of the Great Plains. That includes right here in South Dakota, where demand for corn and soybeans, including the uptick in demand due to biofuel use, has resulted in massive swaths of grassland and prairie land being plowed under for the first time in just the last 15-20 years. South Dakota itself is a hotspot of this habitat loss, particularly eastern and north-central South Dakota, where the rate of grassland habitat loss in recent years is actually higher than that of the well-publicized loss of tropical forest in parts of South America.

From a well-publicized study from Wright & Wimberly (2013), a graphic showing hotspots of grassland loss in recent years. The eastern Dakotas have been a hotspot of habitat loss as grasslands are plowed under and converted to soybean and corn fields.

It’s not just agriculture that’s driving habitat loss in the northern Great Plains. Energy development is front and center in parts of that range, as new methods for extracting fossil fuels have been developed in the last 20 years. The image below depicts the “nighttime lights” dataset for a portion of the northern US. These data record visible light energy from the Earth’s surface at night. Larger cities are clearly visible in the data, but…what’s the massive blob of light in sparsely populated western North Dakota?

Image from the Defense Meteorological Satellite Program’s Operational Line Scan System (DMSP-OLS), generally referred to as the “Nighttime Lights” dataset. Depicting areas of visible light at night, lights from urban centers clearly dominate. However, one of the biggest signals is a sparsely populated, massive swatch in western North Dakota. Those are flaring natural gas associated with hundreds and hundreds of oil wells, as fracking technology made extracting oil possible in this region.

North Dakota is now the 2nd largest oil producing state in the country, thanks to fracking technology developed in the 2000s that has allowed companies to extract a difficult to access, but massive resource of oil in the region. There are hundreds upon hundreds of oil wells in the region, wells that may be spaced out across the massive prairie landscape, but…each well requires access, each well requires energy sources. None of this was there even just 15 years ago, but now the network of wells, roads, and powerlines has severely fragmented grassland habitat in the region.

Range map of the Chestnut-collared Longspur, overlaid with general are of Bakken Oil Formation
The species range map for the Chestnut-collared Longspur, with the general area of the Bakken Oil Formation in the cross-hatched area. The red color on the underlying map represents the breeding range of the Chestnut-collared Longspur. The location of the Bakken formation? Smack dab in the middle of it.

As the map above shows, the Bakken formation is smack dab in the middle of the breeding range for the Chestnut-collared Longspur. The area in North Dakota was developed SO incredibly rapidly, with economic considerations overwhelming any thought for habitat or environmental considerations. But for a species such as the Chestnut-collared Longspur that’s been declining precipitously and needs large, intact grassland patches to breed, oil and gas activity in the Bakken couldn’t have come at a worse time, or in a worse place.

Two. Perhaps it’s not a surprise I only have to photos of Chestnut-collared Longspurs, a species that’s “vulnerable” and fading fast. Get out there and enjoy this species while you can, as your chances of seeing it in the future may be fading.

Jun 16 2019

Birding Australia! Southern Cassowary Encounter

Author: DakotaBirder • Discussion: No Comments

Well, I said I’d not blog for a few weeks…the reason? We had a 3-week family vacation in Australia! It wasn’t a dedicated birding trip (my wife and son would rebel if it were!), but I certainly did fit in some birding while there. There’s always something magical about birding somewhere new, whether it’s just in another state or halfway around the world. Birds that may be common are strange and exotic to a new visitor, and your life list increases with almost every bird you see.

I had done some research before leaving, and while any Australian bird was a welcome sighting, there were two things I really wanted to see. First was the incredible variety of birds in the parrot family, something we just don’t have a correlate for in the US. Secondly? I REALLY wanted to see a Southern Cassowary. More than any other bird, a Cassowary is the walking manifestation of “strange and exotic” for a US birder, a living relic that looks as if it’s straight out of the days of the dinosaur. Southern Cassowary are hard to miss if you come across one, given they are the second heaviest bird on earth (up to 190 pounds) and can be over 6-feet tall! However, with loss of their rainforest habitat in Australia, Indonesia, and New Guinea, the total wild population is only 10,000 to 20,000, with only 1,500 to 2,000 in Australia (where it is considered endangered). Still I was hoping against hope that we would be able to catch of glimpse of the massive birds.

Over the three weeks, we visited three general locations: 1) Sydney and the surrounding area, including Blue Mountains National Park, 2) Bellingen area, including Coffs Harbour and Dorrigo National Park, and 3) Port Douglas/Cairns, in the tropical northeastern corner of Australia. The visit to the tropics was the last part of our trip, and it was there where we’d potentially have a chance to see a Southern Cassowary. For our first day in the Port Douglas area, we drove northward into the famed Daintree National Park, a UNESCO World Heritage sight. A description of Daintree from Wikipedia:

Daintree National Park is valued because of its exceptional biodiversity. It contains significant habitat for rare species and prolific birdlife. The name is derived from the Daintree River, which was named by George Elphinstone Dalrymple, an early explorer of the area, after his friend Richard Daintree. Much of the national park is covered by tropical rainforest.[ The Greater Daintree Rainforest has existed continuously for more than 110 million years, making it possibly the oldest existing rainforest .

https://en.wikipedia.org/wiki/Daintree_National_Park

We wanted to make a day of driving as far north into the park as you (reasonably) can, to Cape Tribulation. We left early that morning, arriving at the Daintree River and taking the only mode of transportation possible to get into the northern section of the Park…the Daintree River ferry. Once across the river, the road remains paved up to Cape Tribulation, but it’s a very narrow road winding through the rainforest, with little traffic for most of that stretch. It’s a hell of a drive through some of the densest, most ancient rainforest on the planet. We took our time driving up to Cape Tribulation, stopping at any point of interest or short hike that we could find.

That morning at about 11:00 we pulled into an area that provided a small parking area and a short hike into the rainforest. Unfortunately part of the trail was being worked on, and we were only able to walk half a mile or less before returning to the parking area. Up until that point, I admit I was a little disappointed in the birdlife. In one of the most revered rainforest habitats on the planet, I’d seen little birdlife on our short hikes and stops, and this stop was no different. We got back into the car, and started to leave the parking area to continue the drive to Cape Tribulation. However, as we rounded a corner heading back to the main road, we saw it…Cassowary! There in front of us at the edge of a clearing near the road was the massive bird, a mere 20 yards away! A Cassowary is considered to be just about the most dangerous bird on the planet, with the size and disposition to quickly spoil the day (and life!) of a careless birder. However, I admit upon sighting that bird that caution was the last thing on my mind. I pulled over, grabbed the camera, and got out to try and grab some photos.

We watched the bird for perhaps 20 minutes. For most of that time, it was slowly moving through the rainforest just off the road, obscured by thick vegetation. I followed on foot, staying on the road and trying to maintain a healthy distance, hoping at some point to get a better look. Finally we were rewarded when the Cassowary started to move towards the road…it was going to cross right in front of us! It casually stepped out of the forest in front of us and slowly walked across the road before disappearing into the vegetation on the other side. That was the last we saw of the bird.

I was so excited and into the moment that I didn’t really think much about what was happening…until after the bird disappeared. CASSOWARY! We’d just seen a living dinosaur at incredibly close range! Then came the goosebumps and appreciation for what we’d just witnessed. Even if the trip had ended at that moment I would have come home a very happy birder. Below are some photos of the encounter. It turns out the Cassowary’s of Australia weren’t done with us on this trip (more in a later blog post).

Southern Cassowary - Casuarius casuarius
The best look we had of the Cassowary while it was foraging in the forest. For most of the first 15 minutes of the encounter, the bird was moving through rather thick vegetation, with few unobstructed views. I was thrilled when it briefly moved across this small clearing, offering a relatively clean view. However, just a few moments later it was clear that it was about to cross the road right in front of us.
Southern Cassowary - Casuarius casuarius
The Cassowary first poked its head out of the forest, looking out across the open space and giving us a glance. Was it going to come out, or head back into the vegetation?
Southern Cassowary - Casuarius casuarius
The Cassowary emerged from the forest, paused and pecked at a few things along the side of the road, and then slowly walked across the road, disappearing into the forest on the other side. A perfectly clear, unobstructed view of a Southern Cassowary! Given how much my hands were shaking during the encounter I wasn’t sure if any of the photos would turn out. Was thrilled to see I did manage to capture some sharp photos to help document the encounter.
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