Field work, fall 2014

We have been dividing our time here at RRBO censusing and measuring fruit, and banding birds in order to collect the seeds of fruit eaten by the birds.

I know you want me to show you bird stuff first!

Bird of the season so far goes to this Marsh Wren, only the second ever banded by RRBO; the other one was in 1999. Since there are essentially no marshes in Dearborn, this is not a common species here, and this is only the 7th record. Probably the coolest thing was the amazing sound this bird made. 

 

One of the most interesting warblers I've banded lately was this adult female Black-throated Blue Warbler. In dimorphic species, sometimes older females can have relatively male-like plumage. This gal had a lot of blue tones in her feathers, a darkish face, and a very large white "hanky."

Orange-crowned Warblers are always nice -- one of the treats of late fall.

We catch very few Yellow-bellied Sapsuckers -- this is the 6th in over 20 years -- so this youngster was fun to see. Woodpeckers tend to hammer on your fingers, and the very fine, chisel point of a sapsucker bill is an effective weapon...

 

...although nowhere near as formidable as the powerful bill of a Rose-breasted Grosbeak. We always give grosbeaks a lot of respect!

One thing we always look at when trying to determine the age of birds is whether there is contrast between old and new feathers. In the photo above, it's easy to see the four paler, more worn wing feathers, which she has not replaced this year, and how they contrast with the new, fresher, darker wing feathers. The new feather in the middle that is a bit shorter is still growing in.

Onto the fruit. Our analyses of seeds found in the fecal samples of birds requires context: some sort of compilation and rank abundance of all the ripe fruit available to birds to eat when they are present in the area. Each year, we estimate the percent of ripe fruit on the common species once a week or so throughout the season. This year we are making sure we have complete data on all fleshy fruits available, even if they have not shown up in fecal samples -- all together around two dozen species. For less-common fruits, we have tried to locate and count all individual fruit, once a week. For abundant species, we cut down branches, counted all the fruit, and came up with an average for a "representative" branch. Then we go out and count the number of representative branches each week in a 200 meter circle centered on our banding area.

I can tell you that this work falls under both "tedious" and "easier said than done." It is not precision work (and it varies annually depending on fruit crop), so what we'll end up with is a list in approximate rank abundance, based in categories that increase by orders of magnitude. Even with that crude ranking, it's not easy and very time consuming. Much of our counting is done along a busy public bike path. People are intrigued when they see one of us standing and staring at the vegetation for long periods of time; they inevitably ask us what I am looking at. I know I have become much more adept at writing down my fruit counts and keeping track of where I am so that I can stop and explain what I'm doing.

How many ripe multiflora rose hips are just
in this one bush?

We also take various measurements of the fruits of each species throughout the season: the diameter of individual fruits, how many seeds they contain, and the diameter of the seeds. This can help us understand what size fruits are favored by different bird species, if they prefer fruits with a few large seeds or more small seeds, etc. Some fruits are simple: the shrub dogwoods are typically 5 to 8 mm, and have one seed. Then there are fruits like Climbing Nightshade (Solanum dulcamara), which have around three dozen, 2 mm seeds each! All get dutifully counted and measured. 

We start on Monday, spend at least one full day just working on fruit, and finish as best we can on days we band. Due to our funding shortfall, our days have been cut back so we are cramming as much work in as possible.

These tasks would not be possible without the help of Dana Wloch, who first started with RRBO as an undergrad, then under several grants, including one where she helped develop our seed identification website, and now is back as a volunteer. Thank you, Dana! We are the dynamic fruit duo of Dearborn.

Update on European Goldfinches

Update: This paper has been published! It's open access so you can read online or download the PDF; click on title below -

Craves, J.A., and N.M. Anich. 2023. ­­­Status and distribution of an introduced population of European Goldfinches (Carduelis carduelis) in the western Great Lakes region of North America. Neobiota 81:129-155. doi: 10.3897/neobiota.81.97736

--

People continue to leave me comments on my previous posts about European Goldfinches in the U.S. (see list of posts below). I am still keeping track, especially of breeding records. In addition to accumulating reports from proactive observers, I also periodically look through birding listservs and eBird records. Unfortunately, any Illinois records put in eBird are filtered out of public view, but the state reviewer is working on changing this. Even so, I still have over 50 records of well over 100 birds from the past few years just in southern Wisconsin and northern Illinois alone.

Here's a map from a previous post, showing the Wisconsin and Illinois counties highlighted in red where the bulk of reports of European Goldfinch come from.

In a previous post, I documented nesting in Waukegan, Illinois, which is in Lake County. Later, I found a report online of a family of European Goldfinches at Waukegan Beach on 13 August 2009, consisting of five birds: two adults, and two juveniles, with the fifth bird likely also a juvenile. The observer posted this photo on Flickr. The day before the photo was taken, another observer saw a minimum of 13 European Goldfinches foraging in a weedy area in what appeared to be two to four family groups in an area just adjacent to Waukegan Beach.

In 2011, European Goldfinches were reported nest-building at Waukegan Beach. A report in April 2012, just a couple weeks ago, also mentioned them gathering nest material. So it seems a breeding population is well-established in the Waukegan area.

These may not be the first European Goldfinches to have nested in Illinois, as there was also a report of birds nest building at Montrose Point in Chicago, Cook County as early as 2003.

In Wisconsin, the breeding population seems centered in the Racine area of Racine County. That is around 25 miles north of Waukegan. My previous post documented a juvenile in 2009 in the Racine suburb of Mt. Pleasant. Subsequently, I received a report in late July 2009: the Scheefs in suburban Racine reported on a juvenile showing up at their feeders shown in this post.

I also heard from Sarah Anspaugh of Racine, who took the photo below of a European Goldfinch family. A pair showed up at her feeder on 13 May 2009, appeared periodically through June, and on 8 July 8 there were 2 juveniles with them.


Jane Scheef of Racine contacted me again in 2010. The pair in her neighborhood arrived at her feeder on 29 June with 5 young in tow, shown in the photo below.



I think that an eBird report of six to eight coming to a feeder in Racine in late winter 2011 may be the same residence. The largest flock I have heard about was that of 30 on 4 December 2011, also in Racine (I think this checklist is the exact location).

Finally, in between Waukegan, IL and Racine, WI is Kenosha, WI, where a correspondent named Donna has had at least one pair of European Goldfinches at her feeders. In June 2011, she photographed them with three young. She recently wrote me that a pair is currently coming to her feeders.

Unlike American Goldfinches, European Goldfinches typically nest in May and June, so be on the lookout and keep sending those reports.

Here are my other posts:

• European Goldfinch: Established in the U.S.? -- 1/21/2009, includes link to my paper in North American Birds
• European Goldfinch update -- 6/24/2009 -- includes photos of juvenile birds that nested in Waukegan, IL
• More European Goldfinches -- 7/23/2009 -- more young'uns, these in Racine Co., WI

Geolocators on catbirds

Geolocators are tiny devices that measure light levels for up to two years. This data can be used to calculate latitude and longitude when compared with sunrise and sunset times and light levels at noon in different geographic locations. They are accurate to about 200 km for latitude, with better resolution for longitude.

When mounted on a bird, a geolocator records light intensity data at intervals throughout each day. Retrieved later, the data can be downloaded and migration routes, pace, and destination can be determined. For species with broad breeding and wintering ranges, this can provide important information on exactly where particular breeding populations spend the winter. Given that we have long-term Breeding Bird Survey data indicating that populations of some species are declining in particular regions of North America, figuring out where these birds spend most of the year helps us identify what may be causing their declines, and helps us devise more effective conservation measures.

This fall, RRBO is placing geolocators on a sample of summer resident Gray Catbirds. This project is a joint effort between RRBO and Dr. Melissa Bowlin, who joined the UM-Dearborn faculty late last year and who is a research partner of the Environmental Interpretive Center. Dr. Bowlin's interest is in how physical traits of birds influence their migratory performance. In our catbird study, she will be looking at how the wing shape of individual birds impacts the pace of their migration. The geolocator data will allow us to determine the time it takes for each of the birds to reach their wintering destination, and hopefully where the birds stop each day, so we can calculate the rate of migration for each bird.

RRBO is interested in the approximate route followed by catbirds breeding in this area, as well as where they spend the winter. Previous data from other researchers have indicated that Midwestern catbirds winter in Central America, whereas catbirds Mid-Atlantic nesting catbirds winter in the southern U.S. and the West Indies. This information is based on small sample sizes: recoveries of 17 banded birds and 6 birds with geolocators. Our data will add to this knowledge. 

The geolocators are tiny, and are carefully fitted on the birds with a flexible harness that loops around the bird's legs. The total weight of the geolocator plus the harness is less than a gram, or about 2.5% of the weight of an average catbird. The recommendation for any kind of radio transmitter or attachment to a bird is 4% or less. The geolocator rests just above the bird's rump. Dr. Bowlin has done careful studies, published in the journal Methods in Ecology and Evolution, determining the effect of drag and weight of various types and configurations of geolocators, using preserved bird bodies in a wind tunnel. The set-up we are using is the best available configuration to minimize these effects.

A geolocator, attached with a leg harness, above the rump of a
catbird at RRBO. The little wand pointed toward the tail is
the part with the light sensor.

When the feathers are smoothed out, only the light wand
sticks out.

Catbirds were chosen for this pilot project because it is not only our most frequently banded long-distance migrant, but also because we recapture a lot of individuals in subsequent years. This is critical because in order to get the data, we have to recapture the bird next year, remove the geolocator, and download the information! Geolocators are typically put on nesting birds, because they have the highest probability of returning to the same site in subsequent years. RRBO banding data has indicated that both adult and young birds (hatching year) captured in early autumn, after hatching year birds have become independent, also have a high return rate. This study will also help us determine if deploying geolocators on hatching year or post-breeding birds is viable. If so, it could help expand the use of these devices by migration banding stations that do not operate during the breeding season. Since we are putting geolocators on both adult and young of the same species from the same population, we hope to also see if age is a factor in the choice of migration route or wintering site.

Because the geolocators are hard to see in the field (the arrow
is pointing to the wand on this one), catbirds are also getting
a single green color band to help us relocate them next year.
(The dark "mustache" on this bird is a juice stain from a meal
of berries!)

As you can see, the potential for these little devices to unravel basic life history mysteries is huge. The pioneering study with bird and geolocators was done by Dr. Bridget Stuchbury and published in the journal Science. The study looked at Wood Thrushes and Purple Martins, and is summarized here. Geolocators are being used to study Bicknell's Thrushes, Bobolinks, Red Knots, Ruddy Turnstones, and Golden-crowned Sparrows, among other species.  Much more information on this technology, as well as the importance of what we can discover is available at the web site of the Migratory Connectivity Project.

We plan to offer donors an opportunity to sponsor these catbirds. To be included in our fall campaign, add your name to the RRBO mailing list.

Update on the Ross's Goose

In my last post, I described the discovery of a Ross's Goose on 24 March 2011, a first record for Dearborn. The goose was banded, and we have just received the details from the Bird Banding Lab.

This was a nestling male banded on 7 August 2006 in Nunavut. This much I knew from reporting the goose on the Bird Banding Lab's web site. The location, it turns out, is McTavish Point. The geocoordinates are 67.75, -101.08333, which places it north of the Arctic Circle in the Queen Maud gulf region, where over 90% of the world's Ross's Geese nest.

This map (click to enlarge) shows the banding location with a red marker: this is 1900 miles in a straight line from Dearborn. I've also indicated the location of Akimiski Island in James Bay, Nunavut. Although we do not see many Canada Geese with orange neck collars around here any longer, this is where nearly all of them were banded.

Ross's Geese have undergone a substantial population increase in the last few decades, and while once exceedingly rare in the Midwest and eastern U.S. during migration and winter, they have been showing up in these regions with increasing frequency. The increase in Arctic-breeding geese (especially Snow Geese) has profound impacts on sensitive habitats. "Our" Ross's Goose was banded by Ray Alisauskas, a scientist with the Canadian Wildlife Service, one of the key researchers working on the status of Ross's Goose and Snow Goose and their impacts on Arctic ecosystems. (Thus answering the obvious question of who would be in such a remote place banding geese!)

Most of the specific information on the winter or migratory distribution of Ross's Geese based on band recoveries is from hunters. Presumably, a report like ours, from a live bird, is quite rare.

While not the flashiest bird, this Ross's Goose surely had one of the most interesting stories of any bird we have encountered!

More European Goldfinches

Update: This paper has been published! It's open access so you can read online or download the PDF; click on title below -

Craves, J.A., and N.M. Anich. 2023. ­­­Status and distribution of an introduced population of European Goldfinches (Carduelis carduelis) in the western Great Lakes region of North America. Neobiota 81:129-155. doi: 10.3897/neobiota.81.97736

On the heels of my recent posting on a report of a family of European Goldfinches in Waukegan, Illinois comes another report with photo documentation of a juvenile "EUGO". This one is from a the Racine, Wisconsin suburb of Mt. Pleasant, about 25 miles north of Waukegan.

An adult was first seen at the observer's feeder in June, although neighbors had seen multiple EUGOs at their feeder (and I have many reports from the Racine area). On 9 and 22 July, a young bird showed up, at times with an adult, and these were among the photos obtained:

Juvenile European Goldfinch, Mt. Pleasant, WI.

Left, adult European Goldfinch. On the right, the juvenile European Goldfinch on the left side of the sock, and an American Goldfinch on the right side.

Here is a map of the southern end of Lake Michigan; the counties reporting the most European Goldfinches are outlined in red. McHenry County in northern Illinois is the suspected point of release of many of the birds.


Keep those reports coming.

Photos copyright J. Scheef. Used with permission.

European Goldfinch update

Update: This paper has been published! It's open access so you can read online or download the PDF; click on title below -

Craves, J.A., and N.M. Anich. 2023. ­­­Status and distribution of an introduced population of European Goldfinches (Carduelis carduelis) in the western Great Lakes region of North America. Neobiota 81:129-155. doi: 10.3897/neobiota.81.97736

Earlier this year, I posted about a paper I wrote summarizing sightings of European Goldfinches (Carduelis carduelis) in the Midwest. A population is apparently established in northeastern Illinois and southeastern Wisconsin.

I just received a report from a resident of Waukegan, IL, about 10 miles from the Wisconsin border. She hosted four adult European Goldfinches last year, and up to eight this spring. On 20 June, she reported an adult with two youngsters in her yard. On 22 June, she saw four young with two adults, and sent these photos.

I've had a handful of reports of nesting European Goldfinches from Illinois or Wisconsin since 2003, but only two with photo documentation. This Waukegan report is the most detailed and the first definitive report away from the "epicenter" of sightings in McHenry Co., IL, which is about 40 miles west of Waukegan.

As they do in their native range, European Goldfinch nest in May and June, which is earlier than American Goldfinch. However, in Europe and Asia, they raise two broods, sometimes three, so nesting in the two species here in North America could overlap.


As you can see, the juveniles are superficially like dull or female American Goldfinch, but any good look will reveal the jet black wings with large yellow wing patches. Young European Goldfinch lack the red on the face and the head pattern of the adults. The Waukegan host will be watching to see when the young birds acquire the red faces of adults, (should they continue to come to her feeders) which I expect to happen sometime in the fall.

I welcome further reports of nesting European Goldfinches!

See also this update from July 2009.

Photos copyright E. Powell. Used with permission.

Dearborn's North American Migration Count

The North American Migration Count takes place the second Saturday each May. It aims to take a "snapshot" of migration, and is compiled on a county basis. My husband Darrin is the coordinator for Wayne County, and we covered the city of Dearborn together on May 9.

The first half of the day was spent scouring the U of M-Dearborn campus -- my daily spring bird survey deluxe. Joining us was our good friend and RRBO supporter Jamie Jacob. A cold front was approaching, and while the first hour or so was okay, the winds quickly kicked up, making it difficult to hear or see birds. As I indicated in my last spring survey post, birding has been a bit slow lately. We ended up with just 76 species for the campus. Our highlights were a Hooded Warbler in the floodplain along the Rouge River, and a Red-headed Woodpecker in the swampy area near the river at the north end of campus. It was one of only 14 warbler species seen on campus. The first Eastern Wood-Pewee of the season was found. There was an obvious increase in the number of Baltimore Orioles and White-crowned Sparrows over the last few days.

Julie and Jamie, hitting the trails.

After campus, we checked out all the various sunflower/wildflower plantings around the city. The sunflowers are, of course, all spent and sagging. The wildflower fields have all been recently mowed, and several fields were not planted last year at all. Thus, they did not have ideal habitat. But we were hopeful for shorebirds at some of the fields with large puddles -- there have been Least Sandpipers in a couple recently. But we were skunked other than Killdeer and Spotted Sandpiper. The wetland area near the Ford Rouge Complex visitor center is really maturing, and we had a lot of Red-winged Blackbirds and Northern Rough-winged Swallows. After these locations and a few others, time was running out. Darrin wanted to hit Grosse Ile, and I still had to roam around our neighborhood (where I had 30 species).

The species total for Dearborn was 83. Here is our list:

Canada Goose 67
Wood Duck 3
Mallard 10
Pied-billed Grebe 1
Double-crested Cormorant 1
Great Blue Heron 7
Green Heron 1
Turkey Vulture 6
Cooper's Hawk 2
Broad-winged Hawk 1
Red-tailed Hawk 1
American Kestrel 1
Killdeer 13
Spotted Sandpiper 1
Ring-billed Gull 39
Herring Gull 2
Rock Pigeon 9
Mourning Dove 35
Chimney Swift 11
Ruby-throated Hummingbird 3
Belted Kingfisher 2
Red-headed Woodpecker 1
Red-bellied Woodpecker 11
Downy Woodpecker 12
Hairy Woodpecker 4
Northern Flicker 9
Eastern Wood-Pewee 1
Least Flycatcher 3
Eastern Phoebe 5
Great Crested Flycatcher 4
Blue-headed Vireo 2
Warbling Vireo 2
Red-eyed Vireo 4
Blue Jay 59
American Crow 2
Tree Swallow 1
Northern Rough-winged Swallow 25
Cliff Swallow 6
Barn Swallow 13
Black-capped Chickadee 10
Tufted Titmouse 3
White-breasted Nuthatch 5
House Wren 14
Ruby-crowned Kinglet 3
Blue-gray Gnatcatcher 10
Veery 2
Swainson's Thrush 1
Wood Thrush 3
American Robin 165
Gray Catbird 18
Euro. Starling 261
Cedar Waxwing 6
Tennessee Warbler 3
Nashville Warbler 21
Yellow Warbler 4
Chestnut-sided Warbler 2
Magnolia Warbler 2
Yellow-rumped Warbler 8
Black-throated Green Warbler 4
Blackburnian Warbler 2
Palm Warbler 4
Black-and-white Warbler 4
Ovenbird 4
Northern Waterthrush 1
Common Yellowthroat 1
Hooded Warbler 1
Scarlet Tanager 4
Chipping Sparrow 11
Savannah Sparrow 11
Song Sparrow 11
White-throated Sparrow 4
White-crowned Sparrow 78
Northern Cardinal 34
Rose-breasted Grosbeak 11
Indigo Bunting 8
Red-winged Blackbird 46
Common Grackle 27
Brown-headed Cowbird 59
Baltimore Oriole 33
House Finch 5
Pine Siskin 2
American Goldfinch 43
House Sparrow 94

Banding in Nicaragua: The Birds

As a follow up to my introductory post, I'd like to share some highlights of the birds at Finca Esperanza Verde, and the importance of shade coffee to their survival.

Even more so than the areas we visited in Panama last year, Finca Esperanza Verde and other shade coffee farms are critical to preserving biodiversity of birds and other wildlife in Nicaragua. We were stunned at the deforestation. It's not due to human development, but to agriculture (mostly non-commercial) and cattle grazing. Shade coffee farms appeared to be one of the only land uses that preserved a lot of trees.

During our brief stay, we counted well over 100 species, including nearly two dozen species of migratory songbirds that breed in North America but winter in the tropics. Over 30 species of migrant songbirds have been recorded at the finca, and the overall bird list is approaching 300 species.We observed or banded several species new to the finca ourselves. We banded about 70 birds of over 30 species at Finca Esperanza Verde. For most of the time, we were banding right in the coffee production area.

Here's where we banded. The shorter dark green

shrubs in the foreground are coffee, interspersed with
taller native trees providing shade and habitat.

You know you're off to a good start when the
first bird you band is a Collared Trogon
(Trogon collaris).

The most common North American migrants banded at FEV are Yellow-bellied Flycatcher, Wood Thrush, Worm-eating Warbler, Wilson's Warbler, Kentucky Warbler, and Ovenbird. Although we captured multiple individuals of those species, we rarely if ever saw the other species, with the exception of Wood Thrushes, in our birding walks through the finca. On the other hand, Baltimore Orioles, Chestnut-sided Warblers, and Tennessee Warblers were very common in the coffee production areas, but we didn't capture any. This underscores how well banding supplements surveys for censusing an area. Other common North American migrants included Black-throated Green Warbler, Black-and-white Warbler, and Summer Tanager. The species I've listed in bold are among the 25 priority species targeted by the MoSI program.

Wood Thrushes (Hylocichla mustelina) are the most commonly banded birds at the finca -- migrant or resident.

Yellow-bellied Flycatcher (Empidonax flaviventris).

Worm-eating Warbler (Helmitheros vermivorum).

My husband Darrin weighing a bird with a spring scale.

At times, it was all a blur!

Kentucky Warbler (Oporornis formosus).

Although a limited number of birds have been banded at FEV, especially compared to stations operating for more days per year, between-year recaptures are beginning to occur. North American migrants which have returned to the same tiny areas to spend the winter include Wood Thrush, Wilson's Warbler, Louisiana Waterthrush, and Kentucky Warbler. The fact that these birds are showing strong wintering site fidelity emphasizes the importance of habitat preservation in the tropics. By extension, it also suggests that shade coffee is providing habitat that is worth "coming back to" for these migrants, and that the habitat quality is sufficient that the birds were in good enough shape on departure to survive their northbound journey and consequently return the following year.

Wilson's Warbler (Wilsonia pusilla), a species
showing wintering site fidelity at the finca,
being recaptured in multiple winters. We
also found them common in shade coffee farms in
Panama.

Resident birds are being recaptured between winters,
too. Here Curtis shows off a recaptured Spot-
breasted Wren -- he banded this bird
himself at FEV two years previously!

It's pretty cool seeing familiar birds in unfamilar lands, and especially interesting to see Tennessee Warblers sharing a tree with Keel-billed Toucans, or Chestnut-sided Warblers hopping around with Elegant Euphonias (we also called these "Extraordinary," "Superlative,"or "Especially Elaborate" Euphonias). And seeing tropical birds in the hand is even cooler. Only North American migrants received U.S.-issued bird bands. Resident birds got special site-specific bands, since there is no established banding entity in Latin America coordinating the banding programs there. For each resident bird, we took extensive notes on plumage, measurements, and breeding condition. There is no standard reference for how to determine the age and sex of most tropical birds (in fact, there is no field guide for Nicaraguan birds), or detailed information on life cycle events. All of this data is valuable!

Crimson-collared Tanagers were one of my favorite resident
birds that I banded. But they sure did bite!

Also vying for top spot was this brilliant Blue Bunting.
FEV is at the southern edge of their breeding range,
and this was the first recorded for the finca.
The next day, we caught a female.

Darrin's favorite was this Rufous-browed Peppershrike,
a tropical member of the vireo family. How about
those orange eyes?

We caught and measured, but did not band, a number of species of hummingbirds. The most common was Long-billed Hermit, shown above. We also handled Violet Sabrewing, Rufous-tailed Hummingbird, Stripe-throated Hermit, Violet-crowned Woodnymph, and Stripe-tailed Hummingbirds. I've written more about the resident birds we banded, and given some further details on how FEV compares with other shade coffee farms, at my blog Coffee & Conservation -- with more colorful photos, too!

Once again, I am struck by the importance of shade coffee to birds and biodiversity. Nicaragua is one of the poorest countries in the western hemisphere, with an unemployment rate over 50%. Outside of the few urban areas, there is little work other than farming. Growing quality coffee under shade in an ecologically responsible way requires a lot of extra work for farmers who are essentially trying to provide for their families after decades of devastating civil war. Many Nicaraguan farmers don't consider the effort worth it -- because consumers are not willing to pay more than a few cents extra for organic or shade-grown coffee.

I can't state it any plainer than this: if you are buying inexpensive, grocery-store coffee you are contributing to the destruction of bird habitat and the decline of migratory songbirds. Bird conservation and great coffee are two of my passions -- and they go hand in hand. That's why I began writing Coffee & Conservation, where you can learn more. On Saturday, May 16, there will be a "Caffeinated Conservation" bird walk here on campus focusing on the connection between coffee and migratory birds; watch the EIC web site for more details.

Banding in Nicaragua: Introduction

Sunset at Finca Esperanza Verde.

I'm back from Nicaragua. It was a busy and rewarding trip, and as promised I'll share with you some highlights of the banding we did at Finca Esperanza Verde (FEV), a shade coffee farm in the central highlands east of Matagalpa. Although it is a widely used tool in North America, bird banding in Latin America is limited by a severe lack of funding, materials, and trained personnel. This situation should be of concern to bird lovers here in the U.S. -- remember that most of "our" breeding birds spend more time on the ground in the tropics in winter than they do here in the breeding season. Yet very little is know about the winter ecology of our birds in the tropics, or its link to overall population health.

To address these questions, the Institute of Bird Populations (IBP) started a program in 2002 called MoSI (the acronym comes from the Spanish "Monitoreo de Sobrevivencia Invernal" or Monitoring Overwintering Survival). Around 150 bird banding stations are located across the American tropics, and the goal is to learn more about physical condition, habitat use, and survivorship over the winter, and how various factors impact subsequent breeding activity. The protocol for these stations requires banding for five, three-day periods each winter. Currently, there are not enough trained banders in the area to operate a bona fide MoSI station at FEV, but any data on the winter ecology of migrant and resident birds is helpful. At FEV, this was the fifth year of a banding project initiated by John Connors and John Gerwin of the North Carolina Museum of Natural Sciences.

Shade coffee at Finca Esperanza Verde. Can you tell
what is coffee and what is natural vegeation?

Most people are aware that deforestation is a big problem in Latin America, and much of it is due to agriculture. Coffee is an understory shrub that naturally grows under the shade of other trees. These types of coffee farms provide very good habitat for birds and other biodiversity, often closely resembling the composition of fauna in natural forests. However, in the last decade or so new types of coffee have been developed that can be grown without the protection of shade, in higher densities, and with higher yield. This "sun coffee" not only results in forests being cleared for intensive coffee growing, but these varieties require high levels of fertilizer, pesticide application, and deplete tropical soils. Thousands of acres of forest in Latin America have been cleared for growing "sun coffee." Bird research -- including bird banding -- has helped us understand the importance of shade-grown coffee to migratory and resident birds. I have read a lot of this research, but nothing can quite compare to participating in it myself!

Mariamar and my husband Darrin get ready to process
a bird at the "Yellow Trail Banding Station" at
Finca Esperanza Verde.

We joined Curtis Smalling, biologist with North Carolina Audubon and Mariamar Gutierrez, Central American coordinator for MoSI for two days of banding in a section of the coffee farm that had not been maintained in several years. After that, we were joined by Dr. Lynn Moseley and her students from Guilford College for three days of banding in the active coffee production area. During breaks, the students heard short lectures on tropical ecology, birds, and the various uses of banding. Curtis talked about monitoring breeding birds in North Carolina through the Monitoring Avian Productivity and Survivorship program, also run by IBP. Mariamar talked about MoSI. And I gave a talk about how I use banding to do stopover ecology research.

Here I am discussing RRBO's work on stopover
ecology with other members of the group from Guilford
College.

And here I am having my talk interrupted by local
campesinos who use this trail to travel between
villages.

We banded for a couple hours each morning, and a couple of hours in the late afternoon, avoiding the mid-day warmth. The first couple of days we were limited in the number of nets we could open because of windy conditions. Despite our modest efforts, we banded about 70 birds of over 30 species, both residents and wintering migrants. In my next post, I will talk about what species we banded and post more photos!

Learn more:

• This article in Living Bird discusses the MoSI program, featuring Nicaragua.
• The problems with "sun" coffee.
• Birds and coffee plantations.
  

A tropical adventure

A trip to anywhere in the tropics is always high on my list of great things to do. Over the last 7 years or so, my husband Darrin and I have volunteered our time to a number of organizations operating in the tropics -- usually doing bird surveys or otherwise assisting local ecologists. Our newest opportunity will be next week in Nicaragua.

The bulk of our time will be spent in the montane coffee-growing region of Matagalpa. Some of you know that I have a passion for excellent coffee, and write an entire website devoted to the issues surounding sustainably-grown coffee. Coffee grown under shade in an eco-friendly manner is critical for tropical biodiversity, and for so many of the migrant birds that breed in North America and winter in the tropics. Those of you who are members of Cornell's Lab of Ornithology may have seen the recent article on shade coffee in BirdScope in which I was quoted.

Darrin and I have been invited to participate in an on-going bird banding project initiated by the North Carolina Museum of Natural Sciences. In Matagalpa we will be visiting Finca Esperanza Verde (FEV), a shade coffee farm near the village of San Ramon (click on the map to enlarge). We will be banding first with other researchers, and then assisting a group of college students from North Carolina. This project helps to document the birds that use the finca -- both resident species and those that nest in North America but winter in the area, or are on their northbound migration. For example, the most frequently banded North America wintering species at the finca is the Wood Thrush. One of our North Carolina colleagues, Curtis Smalling of North Carolina Audubon, will be working specifically with Golden-winged Warblers.

We will not only band birds, but of course also observe and census birds at FEV. Counter Culture Coffee in Durham, NC sources coffee from FEV and other farms in the San Ramon area; coffee from FEV was one of the top ten coffees in the prestigious 2007 Cup of Excellence program. I'll be providing feedback to Counter Culture about the birds on the farm. I'm excited to admit that I assisted Counter Culture with their choice of the Emerald Toucanet as the bird on their Cafe San Ramon packaging (left). Darrin and I have seen this species at other shade coffee farms in Panama, and knew it was on the finca's bird list.

After we leave FEV, we will be traveling back toward the colonial city of Granada, near the shores of Lake Nicaragua. After a few birding stops en route, including another shade coffee farm, we will be settling in for several days at Domitila, a private wildlife reserve. Domitila represents one of the last and best preserved dry tropical forests in the country. At both FEV and Domitilia, we will be conducting insect surveys, focused on dragonflies and damselflies, to assist with the Insects of Nicaragua inventory being conducted by the Museo Entomológico de León (Entomological Museum of Leon). There is still much to be learned about Nicaraguan insects now that the country is peaceful after so much civil war. We can attest that even well-studied countries like Panama turn up surprises. On our last two trips there, we photographed at least one undescribed species of damselfly, and took the first photograph of a live specimen of another species that was described over 30 years ago. Who knows what we might turn up in Nicaragua!

When we return, I will be writing an article on the importance of shade grown coffee to birds, incorporating my experiences, for Birder's World Magazine.

Of course, I will also share as much as I can with you here at Net Results. Be patient: for most of the trip, we will not have Internet access (or electricity, or hot running water!), so I will have to wait to return home to post updates when I am not busy catching up and getting ready for spring migration.

Five years of Christmas Bird Counts at Humbug

It's hard to believe that I have been doing bird surveys at the Humbug Marsh Unit of the Detroit River International Wildlife Refuge for five years. The Refuge was established in 2001 and includes a patchwork of properties along 18 miles of the lower Detroit River. The 410-acre Humbug Marsh unit, straddling Trenton and Gibraltar, was acquired in 2003 after a lengthy battle with developers. It represents the last mile of undeveloped land on the U.S. mainland side of the Detroit River. RRBO's partnership with the U.S. Fish & Wildlife Service and the Refuge began in 2004. Although this area is within the Rockwood Christmas Bird Count (CBC) circle (itself established in 1974), it had never been accessible for bird surveys. Since 2004, RRBO has completed five CBCs at Humbug, as well as two North American Migration Counts, four years of Breeding Bird Atlas work, and two major insect surveys. December 27 was our fifth CBC at Humbug. The day started with very thick fog, making waterfowl counting difficult. Some years, much of the river is frozen and a lot of waterfowl gather in the channel between the mainland and Humbug Island. This water stays open due to the warm discharge from the Trenton Power Plant just upstream. Humbug Island is to the right in the photo below, but the thick fog bank in the center is completely obscuring Grosse Ile. The day ended up breezy and very balmy, with record-breaking temperatures over 60F. This melted much of the snow we'd had in the previous weeks. In the southern portion of the Refuge, an old road was removed over the summer. In its place: thick muck and deep water-filled ruts covered in sloppy snow and thin ice. We were unable to fully cover this area because we just couldn't walk through it. Still, we had a nice adult male Sharp-shinned Hawk at this spot. The Humbug Marsh Unit is not yet open to the public. When my husband Darrin O'Brien and I do the CBC there under RRBO's special use permit, we are alone to walk the many acres. There are a few new, formal trails, but usually we just have to follow deer trails or bushwhack. The northernmost part of the property is an old brownfield. It's quite open and in the winter has the fewest birds. Here I am traipsing across the middle of it. We had 47 species at Humbug for the day. Highlights included two Bald Eagles, a Yellow-bellied Sapsucker, one American Crow (the first on the Humbug count in five years!), three Brown Creepers, one Winter Wren, five Golden-crowned Kinglets, three Hermit Thrushes, an Eastern Towhee, a Purple Finch, and six Rusty Blackbirds. The rusties were also the first we've had there in winter, and we were happy to see them because it is a species in significant decline. We had over 200 American Robins, and over 50 White-throated Sparrows (Humbug is a great site for wintering white-throats). In the midst of it all, I was able to take a short break on one of the new benches along the river. The cumulative species total for the five years is a respectable 74. Only 16 have been seen all five years, in large part due to the variable mix in waterbirds influenced by river conditions. Unusual species have been Gray Catbird in 2005 and Common Yellowthroat in 2007. The species total will undoubtedly grow as habitat is restored and, when the unit is fully open to the public, the number of participants on the count increases. January 1 is the date for the Detroit River CBC, which includes Dearborn. I'll post a report on that count next week!

Sampling for avian flu

RRBO is in its second full year of sampling birds for avian influenza. There are many different subtypes of "bird flu," most of which are mild "low pathogenic" avian flu viruses which are not dangerous to humans. The type of bird flu often in the news is the highly pathogenic subtype H5N1, which causes high mortality in domestic poultry. It has not been found in migratory songbirds in North America.

The Landbird Monitoring Network of the Americas (LaMNA; RRBO is a charter member) and UCLA's Center for Tropical Research initiated a program in 2006 to learn more about the identity, frequency, and geographic distribution of virus sub-types and strains carried by landbirds. Sampling for avian flu is done at migration monitoring stations such as RRBO, breeding bird stations (Monitoring Avian Production and Survivorship, or MAPS), and wintering bird stations in Latin America (Monitoreo de Sobrevivencia Invernal, or MoSI).

Sampling only takes an extra minute during our banding process. It consists of taking a very tiny sterile swab and sampling cells shed from the intestines at the entrance to the cloaca. The tip of the swab is cut off and placed in a vial of preservative. Two tail feathers are also taken. These can be used in stable isotope analysis, which can give us an idea of where a bird nested. Identifying the breeding areas of birds will help researchers map out where certain strains of virus originate.

Since beginning this project, RRBO has contributed over 300 samples of nearly 50 species. Some are migrants, and some are residents. For many years, we didn't band House Sparrows, beginning during a period when the band size they take (shared by abundant migrants such as thrushes, White-throated, White-crowned, and Song Sparrows) was in short supply. Now they are a valuable species to sample for viruses due to their communal nature and urban haunts. Here's a young male House Sparrow who donated a few cells and two feathers to science.

Sampling will continue through fall here on campus. Then I'll sample at my nearby home to use up any remaining vials -- I'm one of the only banders in the state that provides winter samples to the project.

This is just another way RRBO is making a contribution to a wider understanding of birds in North America. To learn more, check out these links:

• LaMNA avian influenza research project page
• UCLA's Center for Tropical Research Avian Influenza Virus in North American Migratory Birds page
• RRBO's frequently asked questions about avian influenza and migratory birds
  
• NPR's The Environment Report, April 2006, on this project, in which I was interviewed.