GUEST POST: Birds of Siberia’s Yamal Peninsula

Birds of Siberia’s Yamal Peninsula
written & illustrated by Louis-Jean Germain
for shanghaibirding.com

Louis-Jean Germain
Louis-Jean Germain

In spring and summer 2017, I spent two months in the Siberian Arctic on the Yamal Peninsula, 5,300 km northwest of Shanghai. shanghaibirding.com has given me this opportunity to tell you about my experience birding that remote land.

The place I visited on the Yamal Peninsula lies well north of the Arctic Circle. My first stay was in May and June. I saw the snow melting and waves of birds hurrying to find the best breeding spots. My second stay lasted from the third week of July to the third week of August, during which time I watched parents caring for their young and the first sign of the migration back to the southern latitudes.

THE YAMAL PENINSULA

The Yamal Peninsula (red) is in north-central Russia (green), 5,300 km from Shanghai. Future Trillionaire-Wikimedia/Craig Brelsford.
The Yamal Peninsula (red) is in north-central Russia (green), 5,300 km from Shanghai. Future Trillionaire-Wikimedia/Craig Brelsford.

From September to May, the Yamal Peninsula is covered in thick snow and ice. Temperatures fall below -40°C. The natural habitat is tundra, the circumpolar treeless belt that lies between the Arctic ice and the tree line (taiga). Tundra is characterized by permafrost, low temperatures, and low precipitation. The growing season is short–two to three months.

From the beginning of May to late August, the sun is above the horizon 24 hours a day, its heat melting the ice and snow. The upper layers of the permafrost thaw quickly, producing seasonal lakes and rivers and an intense growth of vegetation and water insects. The warm sun also melts the sea ice, leading to an intense phytoplankton bloom.

The vegetation of the tundra is dominated by cotton-grass (genus Eriophorum), Water Sedge Carex aquatilis, lichens, and a great variety of dwarf shrubs (Vaccinium). The latter produces berries, an important food for birds. Plants and insects, the latter mostly aquatic at this latitude, have developed strategies to resist the extreme cold. They spring back to life as soon as the thaw begins.

Throughout June, July, and August, the tundra is an environment rich in food and, except for Arctic Fox Vulpes lagopus, absent of predators. To take advantage of this remarkable environment, birds migrate here in their thousands, flying thousands of kilometers. As each bird fits into its unique ecological niche, it prepares to reproduce–reproduction being the main purpose of its flight to this harsh land.

INITIAL DISCOVERIES: SHOREBIRDS

Red-necked Phalarope Phalaropus lobatus, Yamal Peninsula, Russia, 5 June 2017. (Louis-Jean Germain)
Red-necked Phalarope Phalaropus lobatus, 5 June 2017. (Louis-Jean Germain)

I arrived at the end of May, equipped with my Nikon Monarch binoculars (10 x 42) and Nikon ProStaff 5 telescope (30x-60x). I had no camera, as I only draw and paint birds. To my amazement, the snow had not yet melted, despite the air temperature’s hovering around freezing. In this white landscape, almost no birds could be seen. An exception was Lesser Black-backed Gull Larus fuscus, attracted by human activity.

My disappointment did not last long. Two days after my arrival, the first rain of the year fell on the tundra, creating small ponds. Almost immediately, as if by magic, birds appeared: Tufted Duck Aythya fuligula, White Wagtail Motacilla alba, and the magnificent Snow Bunting Plectrophenax nivalis. My excitement was intense. What could motivate those birds to come to that place, still so inhospitable, with almost all the land covered by snow and the temperature around freezing?

The next few days were even more exciting. As temperatures rose and lakes formed, I witnessed a massive arrival of birds. There were waterfowl (Steller’s Eider Polysticta stelleri, King Eider Somateria spectabilis) and passerines (Red-throated Pipit Anthus cervinus, Lapland Longspur Calcarius lapponicus, Horned Lark Eremophila alpestris). The first calidrids to arrive were Little Stint Calidris minuta and Temminck’s Stint C. temminckii. The next day, I had Common Ringed Plover Charadrius hiaticula and Ruff Calidris pugnax, and the day after Curlew Sandpiper C. ferruginea, Dunlin C. alpina, Ruddy Turnstone Arenaria interpres, Grey Plover Pluvialis squatarola, and Red-necked Phalarope Phalaropus lobatus.

After 10 days, I also observed a single Pintail Snipe Gallinago stenura, Grey Phalarope Phalaropus fulicarius, and Wood Sandpiper Tringa glareola.

These birds had started their trips two months earlier from places as distant as Africa and Australia. Some may have even passed through Shanghai. What a journey!

MATING DISPLAYS

Ruff in breeding plumage. (Louis-Jean Germain)
Ruff Calidris pugnax, 2 June 2017. (Louis-Jean Germain)

By the beginning of June, the birds were restless. Male calidrids, which arrive before the females to compete for the best breeding territories, were displaying aggressively. As the females arrived, the males switched to a mating display.

Male Temminck’s Stint were hovering and calling noisily to the females. When a female was spotted, the male would chase her, running with his wings upward until she stopped. The male hovered delicately before mounting the female. The cloacal kiss lasted but an instant.

Common Ringed Plover were comical, fluffing their feathers and constantly running around.

The most astonishing behavior was that of Ruff, the only calidrid showing sexual dimorphism. Males are split into three plumage types, using various strategies to obtain mating opportunities at the lek. It was a magnificent sight to see more than 20 Ruff males fluffing their collar feathers and competing for the females.

LOONS

Red-throated Loon Gavia stellata, 14 June 2017. (Louis-Jean Germain)
Red-throated Loon Gavia stellata, 14 June 2017. (Louis-Jean Germain)

After 15 days, with the snow almost completely melted, I thought that the migration was over. Imagine my surprise when I noticed three huge birds on a large lake, low on the water, long necks straight up above the water and with bills curved upward. They were Red-throated Loon Gavia stellata. A pair and a single bird, probably a young male, had just arrived after the long trip up. The pair was looking for a place to nest, inspecting the bed of Water Sedge ringing the lake. The young tried to conceal the female but quickly yielded after an aggressive display by the other male.

The next day, while scanning the other side of the same lake, I saw another large bird swimming low on the water. The neck was stocky and the throat black with a deep purple sheen, brilliant in the sunlight. It was Black-throated Loon Gavia arctica. I was pleased to see this bird in breeding plumage after having seen it in winter plumage in Shanghai in March 2017.

BREEDING PLUMAGE

Curlew Sandpiper Calidris ferruginea in winter plumage (top), assuming breeding plumage (middle) and in full breeding plumage (bottom). (Louis-Jean Germain)
Curlew Sandpiper Calidris ferruginea in winter plumage (top), assuming breeding plumage (middle), and in full breeding plumage (bottom). Top: Thailand, 9 Nov. 2016. Middle: Cape Nanhui, Shanghai, 5 May 2017. Bottom: Yamal Peninsula, 3 June 2017. (Louis-Jean Germain)

As a birder used to operating in temperate Shanghai, I was amazed by the extremely bright colors of the calidrids in June. Calidrids and plovers usually molt into their breeding plumage while migrating to the breeding grounds. It is always a great pleasure for Shanghai birders to observe shorebirds during the spring migration showing their pre-breeding plumage.

On the Yamal Peninsula in June, I beheld a pageant of the most fashionable plumages. I was rediscovering birds that I had previously observed in their duller winter plumage further south.

The English name of Phalaropus lobatus, “Red-necked Phalarope,” suits well the bird I was watching. Also, the Latin name of Curlew Sandpiper Calidris ferruginea (ferruginous, rust-colored) described perfectly one of my favorite sandpipers.

A LUXURIANT GREEN LANDSCAPE

Tundra after snowmelt (June) and at height of summer (August). (Louis-Jean Germain)
Tundra of Yamal Peninsula after snowmelt in June (top) and in August (bottom). (Louis-Jean Germain)

During my second stay, from the third week of July to the third week of August, I discovered a different tundra. The yellowish-buff vegetation had been replaced by luxuriant green plants, cotton-grass, and flowers. I was amazed by this proof of the power of nature. How is it that this place, covered by snow and ice nine months of the year, during which time temperatures regularly fall to -30°C, could show such a remarkably green landscape during the summer? Gazing at the green tundra, I understood more deeply than ever why birds migrate.

Most of the chicks had hatched by that time, and most birds were inconspicuous, trying to hide their offspring from Arctic Fox and Lesser Black-backed Gull. Many drakes had left the area to molt. With patience and perseverance, I managed to spot the nests and offspring of several species.

I also noticed the parental behavior of some species. I was shocked by the devotion of the pair of Black-throated Loon, tirelessly diving for hours to feed their sole, frail offspring. Would this tiny bird be able to undertake a long migration in less than two weeks?

At the end of my stay, I noticed that the loons, both Red-throated and Black-throated, were gathering in groups of seven to nine individuals, showing obviously social displays such as powerful, simultaneous calls, diving, and water-splashing with their wings. The extraordinarily narrow window of time for breeding on the tundra was closing. The loons knew it.

TIME TO HEAD SOUTH

Black-throated Loon Gavia arctica. Breeding plumage. (Louis-Jean Germain)
Black-throated Loon in winter plumage (top) and breeding plumage (bottom). Top: Sanjiagang, Shanghai, 23 March 2017. Bottom: Yamal Peninsula, 15 June 2017. (Louis-Jean Germain)

The birds with their offspring were about to perform another feat, the long migration south. The same wings that had carried them to this brief but rich northern feast would power them away as the killing cold set in.

My observation of the migratory birds on their breeding grounds was a learning experience that far exceeded my expectations. I hope that through my writing and paintings you have achieved a deeper appreciation of their amazing journey.

LIST OF BIRDS

Temminck's Stint in breeding display. (Louis-Jean Germain)
Temminck’s Stint Calidris temminckii, breeding display, 8 June 2017. (Louis-Jean Germain)

During my stay on the Yamal Peninsula in the summer of 2017, I noted the following 40 species.

Greater White-fronted Goose Anser albifrons
Long-tailed Duck Clangula hyemalis
King Eider Somateria spectabilis
Steller’s Eider Polysticta stelleri
Smew Mergellus albellus
Tufted Duck Aythya fuligula
Greater Scaup A. marila
Northern Pintail Anas acuta
Eurasian Teal A. crecca
Willow Grouse Lagopus lagopus
Red-throated Loon Gavia stellata
Black-throated Loon G. arctica
Grey Plover Pluvialis squatarola
Common Ringed Plover Charadrius hiaticula
Ruddy Turnstone Arenaria interpres
Ruff Calidris pugnax
Curlew Sandpiper C. ferruginea
Temminck’s Stint C. temminckii
Dunlin C. alpina
Little Stint C. minuta
Pintail Snipe Gallinago stenura
Wood Sandpiper Tringa glareola
Red-necked Phalarope Phalaropus lobatus
Grey Phalarope P. fulicarius
Parasitic Jaeger (Arctic Skua) Stercorarius parasiticus
Pomarine Jaeger S. pomarinus
Lesser Black-backed Gull Larus fuscus
Arctic Tern Sterna paradisaea
White-tailed Sea Eagle Haliaeetus albicilla
Horned Lark Eremophila alpestris
Northern Wheatear Oenanthe oenanthe
Pechora Pipit Anthus gustavi
Red-throated Pipit A. cervinus
Meadow Pipit A. pratensis
White Wagtail Motacilla alba
Brambling Fringilla montifringilla
Common Redpoll Acanthis flammea
Arctic Redpoll A. hornemanni
Lapland Longspur Calcarius lapponicus
Snow Bunting Plectrophenax nivalis

Featured image: Red-throated Loon Gavia stellata, Yamal Peninsula, Russia, 2017. (Louis-Jean Germain)

I’m Skeptical About Claims of Green-backed Flycatcher in Shanghai

Does Green-backed Flycatcher Ficedula elisae migrate through Shanghai? Records exist of the species, but in my opinion they are mainly misidentifications of female Narcissus Flycatcher F. narcissina narcissina (above). In this post, I am going to unearth the roots of my skepticism about F. elisae in Shanghai and describe the differences between female F. elisae and female F. n. narcissina.

Adult-male Narcissus Flycatcher (L) and Green-backed Flycatcher (R).
I am skeptical about claims of Green-backed Flycatcher Ficedula elisae in Shanghai. One reason is that all the claims involve females, never the adult male (R), which is highly distinctive and readily separable from male Narcissus Flycatcher F. narcissina narcissina (L). If male elisae is unknown in this city, then the elisae we see in Shanghai would all be females, a curious and unlikely phenomenon. L: Yangkou, Rudong, Jiangsu, May 2012. R: Wulingshan, Hebei, June 2017. (Craig Brelsford)

Each spring and autumn, birders in Earth’s Greatest City claim records of elisae. Invariably, the bird in question is a female, not the very distinctive adult male. Here our first red flag pops up: How likely is it that elisae is the one species of passerine whose records in Shanghai never involve adult males?

For the sake of argument, let us admit the possibility of an all-female migration of elisae through Shanghai. Fine, I retort; then show me photos of these purported elisae. The photos are duly supplied, and again and again, as has been the case throughout my more than 10 years in Shanghai, the supposed F. elisae is revealed on closer scrutiny to be yet another female F. n. narcissina.

Indeed, I have seen better documentation in Shanghai of Ryukyu Flycatcher F. (narcissina) owstoni than of F. elisae; on 17 April 2016 at Pudong’s Binjiang Forest Park, Shanghai birder Zhang Xiaolei got a very interesting picture of a possible adult-male owstoni.

Mistakes of the sort many Shanghai birders are making contribute to a distorted picture of the presence on the central Chinese coast of a little-known species. What’s more, the mistakes are avoidable. Separation of female F. elisae and F. n. narcissina is usually straightforward.

Female Narcissus Flycatcher (L) and female Blue-and-white Flycatcher (R). (Craig Brelsford)
Female Narcissus Flycatcher (L) shows brownish-green upperpart coloration reminiscent of female Blue-and-white Flycatcher (R). (Craig Brelsford)

Female F. elisae has greenish upperparts with a yellowish or olive tint. Female F. n. narcissina is greenish with a brownish tint, like female Blue-and-white Flycatcher Cyanoptila cyanomelana (above). On their underparts, female F. elisae is “dull yellow or yellowish-buff,” while F. n. narcissina is mainly off-white, with brownish-white flanks and a hint of yellow on the throat and belly (Brazil).

We can say, therefore, that unlike Pale-legged Leaf Warbler and Sakhalin Leaf Warbler, female F. elisae and F. n. narcissina are distinguishable by plumage. A good look or good photo will likely lead to an accurate ID.

Accurate records in Shanghai, one of the most thoroughly birded areas on the Chinese coast, will lead to better understandings of both F. elisae and F. n. narcissina. Already, the growing body of knowledge about these East Asian breeding endemics has led to the separation of F. elisae and F. n. narcissina into separate species. Previously, elisae had been treated as a subspecies of Narcissus Flycatcher.

Narcissus Flycatcher, Nanhui, 23 Oct. 2016.
Narcissus Flycatcher, Cape Nanhui, 23 Oct. 2016. Note the brownish-green coloration of the mantle, back, and rump of the female. I included an image of the male because in this instance, and as is often the case in Shanghai, the male was associating with the female. The association suggests the birds are of the same species and bolsters the ID of the female as F. n. narcissina. (Craig Brelsford)

We know as well that the summer and winter ranges of the sister species are disjunct, with F. elisae breeding in a very compact range in Hebei (Wulingshan), Beijing, and Shanxi and wintering in southern Thailand and Peninsular Malaysia. The breeding range of F. n. narcissina includes the main islands of Japan as well as the Kuril Islands, Sakhalin, and the coastal Russian Far East. The species winters in Hainan, the Philippines, and Borneo and passes through Shanghai each spring from about 15 April to 15 May.

Unlike other passage-migrant flycatchers in Shanghai, F. n. narcissina is much less common in autumn than in spring. That is a mystery, one of many surrounding the migration of the Narcissus Flycatcher group.

In light of the information deficit, it behooves us Shanghai birders to strive for accurate records (or non-records) of elisae in our region. Let us practice self-discipline, hone our skills, and give outside observers the clearest possible picture of bird migration in Shanghai.

REFERENCES

Brazil, Mark. 2009. Birds of East Asia. Princeton, New Jersey: Princeton University Press. Entries for Narcissus Flycatcher and Chinese Flycatcher (Ficedula elisae), p. 436.

Gill, F & D Donsker (Eds). 2017. IOC World Bird List (v 7.3). shanghaibirding.com’s first reference for taxonomy as well as bird names in English.

Below are links to photos of female elisae:

Oriental Bird Images (orientalbirdimages.org). “Narcissus Flycatcher Ficedula narcissina elisae – Female.” Accessed 21 Oct. 2017.

———. “Narcissus Flycatcher Ficedula narcissina elisae – Female.” Accessed 21 Oct. 2017.

———. “Narcissus Flycatcher Ficedula narcissina elisae – Female.” Accessed 21 Oct. 2017.

———. “Narcissus Flycatcher Ficedula narcissina elisae – Female.” Accessed 21 Oct. 2017.

Featured image: Adult-female Narcissus Flycatcher Ficedula narcissina narcissina, Yangkou, Rudong, Jiangsu, China. 2 May 2012. (Craig Brelsford)

Sakhalin Leaf Warbler at Century Park

​Century Park, Pudong, Thurs. 5 Oct. 2017, Komatsu Yasuhiko and Craig Brelsford, 39 species. Hiko and I blew past our target of 35 species and added three species to the shanghaibirding.com Century Park all-time bird list. The total now stands at 138 species. Hiko and I added five species to the eBird Century Park all-time list, bringing the total to 117.

The new entries on the shanghaibirding.com list are Sakhalin Leaf Warbler, Dusky Warbler, and White-throated Rock Thrush. The new entries on the eBird list are those three plus Japanese Paradise Flycatcher and Taiga Flycatcher.

White-throated Rock Thrush, a new record for Pudong's Century Park. (Komatsu Yasuhiko)
White-throated Rock Thrush, a new record for Pudong’s Century Park. (Komatsu Yasuhiko)

See our day list here: http://ebird.org/ebird/view/checklist/S39560484

“Century Park is getting better,” Hiko said. My young friend is right. Century Park is an island of stability amid the sea of change (mainly degradation) that is the natural environment of Shanghai. Ten years ago this month, when Hiko was a tyke of 6, I made my first visit to urban Shanghai’s best birding area. Little has changed. The biggest difference between October 2007 and October 2017 is, the trees are taller. The wooded areas at Century have an ever-stronger woodsy feel.

Notes:

— Century yielded yet another regional record of Sakhalin Leaf Warbler. Evidence is growing that in the Shanghai area this passage migrant has been neglected and is more common than previously thought. I recently wrote a series of posts, the latest being this one, on distinguishing Sakhalin Leaf Warbler from its sister species Pale-legged Leaf Warbler.

Here is the recording I made of the calling Sakhalin on Thurs. 5 Oct. Apart from a DNA assay, call as well as song is the only reliable way to separate Sakhalin Leaf Warbler from Pale-legged Leaf Warbler. At 4.9 kHz, the “tink” recorded below is a full kilohertz deeper than the call of Pale-legged Leaf Warbler.

Sakhalin Leaf Warbler Phylloscopus borealoides, Century Park (31.219361, 121.551900), Pudong, 5 Oct. 2017 (00:20; 3.9 MB)

Audio spectrogram of call of Sakhalin Leaf Warbler.

Eurasian Woodcock whizzed overhead on its way to Bird Island (31.217405, 121.554936). The woodcock was going to the one best place for it in the urban park. Bird Island, Century’s sanctuary-within-a-sanctuary, is a bird-friendly, cat-free parcel of woodland cut off from the rest of the park by a moat.

Great Spotted Woodpecker used to be found mainly on Bird Island. On Thursday we found 2 in other sectors of the park. With the steadily improving woodland in the park, expect Great Spotted Woodpecker to be seen in more and more areas. Century Park is one of the few areas in urban Shanghai where woodpeckers are commonly found.

Arctic Warbler 9 calling. No evidence Thursday of Kamchatka Leaf Warbler.

Rufous-tailed Robin in undergrowth, ID’d quickly and accurately by Hiko.

Rufous-tailed Robin made a rare foray out of the undergrowth to look at us. (Komatsu Yasuhiko)
Rufous-tailed Robin made a rare foray out of the undergrowth to look at us. (Komatsu Yasuhiko)

Red-flanked Bluetail, Grey-backed Thrush: common winter visitors to Shanghai and seasonal firsts for Hiko and me.

White’s Thrush: a healthy 11 taking advantage of the high-quality woodland in the park.

The shanghaibirding.com Century Park all-time list was started in 2006 by former Shanghai resident and shanghaibirding.com contributor Daniel Bengtsson. I have managed the list since 2015. The list is searchable in English, Latin, and Chinese. As an index of the birds of urban Shanghai, the list is unmatched. Again, the link: http://www.shanghaibirding.com/sites/urban-shanghai/century-bird-records/

Featured image: Komatsu Yasuhiko shows off his image of adult-male Mugimaki Flycatcher at Century Park, Shanghai, 5 Oct. 2017. (Craig Brelsford)

Sakhalin Leaf Warbler in Shanghai: A Clearer Picture

On Sun. 17 Sept. 2017 at Pudong’s Cape Nanhui, I achieved a personal first: photos of an unmistakable Sakhalin Leaf Warbler Phylloscopus borealoides. As expected, the photos show a leaf warbler whose plumage and bare parts are virtually indistinguishable from those of Pale-legged Leaf Warbler P. tenellipes. Coupled, however, as they are with sound-recordings of the same individual, ensuring the ID, the photos constitute a rare visual record of Sakhalin Leaf Warbler in Shanghai.

The leaf warbler I found was easily identifiable as a member of the Pale-Sak species pair. It had strikingly pale pink tarsi, an olive-brown crown contrasting with olive-green mantle and wings, a long and creamy supercilium, and faint wing bars on the median and greater coverts.

The bird, which was in Microforest 1, behaved in a way typical of the Pale-Saks I have observed in the Cape Nanhui microforests, eight tiny woodlands that dot the coastline of the cape. Rarely venturing more than 2 m off the ground, the leaf warbler favored low branches and vines for browsing and sturdy low branches for perching. It pumped its tail steadily, called spontaneously, and upon hearing playback of its own call moved in to investigate the source.

Without recording the call of the leaf warbler (call as well as song being a diagnostic separator of Sakhalin and Pale-legged), would I have been able to get an ID? Almost certainly not, said leaf-warbler expert Phil Round:

“I am a bit less sanguine on finding means (other than call frequency or song) to separate all [Pale-Saks]. Even in the hand, it is by no means clear. We can pick out long-winged male Sakhalin, and short-winged female Pale-legged. But there is more overlap than previously realized, and most are in between. There don’t appear to be any 100% consistent wing-formula differences, and plumage and bare-part features, while somewhat indicative, are again less than 100% reliable–especially under field conditions.” (Round, in litt., 2016; emphasis mine)

The most convenient separator of Pale-Sak is song, the cricket-like trill of Pale-legged being easily separable from the metallic whistle of Sakhalin. As Shanghai is not in the breeding range of either species, Pale-Sak songs are not often heard in Earth’s Greatest City. I have heard Sakhalin sing only once, on 5 May 2016 at Shanghai’s Zhongshan Park (Brelsford 2016). The song of Pale-legged I have heard at various locations in Shanghai as well as on its breeding grounds in Heilongjiang (Brelsford & Du 2017).

Although not as readily distinguishable as the songs, the “tink” calls of Pale-Sak differ markedly and consistently and are a reliable basis for an ID (Yap et al. 2014; Round et al. 2016; Weprincew et al. 1989). Yap et al. say the call of Pale-legged is of a “consistently higher frequency” than the call of Sakhalin. The calls that I have recorded of the two species show a difference in frequency of about 1 kHz, very much in line with others’ findings (Brelsford, August 2017; Brelsford, September 2017).

For birders unaccustomed to Pale-Sak calls, the difference may be hard to detect, especially at windy Cape Nanhui. A sound-recorder (which may be a smartphone) will pick up the difference, and an audio spectrogram will show it graphically. Solid, indisputable ticks, in some cases life ticks, await enterprising birders who sound-record.

In recent months, my work with sound-recordings has helped give Shanghai birders a clearer picture not only of Sakhalin Leaf Warbler but also of Kamchatka Leaf Warbler Phylloscopus examinandus, like Sakhalin a poorly known passage migrant through Shanghai (Brelsford, June 2017). In the case of Pale-Sak in Shanghai, a picture is emerging of overlapping migratory pathways. This finding comports with the findings of Yap et al. at Beidaihe, a thousand kilometers to the north. After analyzing calls obtained at Beidaihe of both Pale-legged and Sakhalin, Yap hypothesizes that in coastal Hebei “the migratory pathways of the two sister species may largely overlap” (2014).

How extensive is the Pale-Sak migratory overlap in Shanghai? How many of the Pale-Saks that we find in Shanghai each spring and autumn are Pale-legged, and how many are Sakhalin? Is there a peak passage time in Shanghai for each species, and if so, when is it?

Answers to these questions are currently unknown, but they are probably knowable, and it is very much possible for the citizen-scientists of Shanghai to be the producers of that knowledge. We only need to change our habits. When it comes to identifying lookalike species such as Pale-legged and Sakhalin Leaf Warbler, birders need to understand that photos do nothing to cut through the muddle. Only sound-recordings lead to indisputable records and a clearer picture of the species in Shanghai.

A clearer picture will add to our knowledge of the movement of leaf warblers along the central Chinese coast, focus attention on little-known East Asian species, and heighten the allure of Shanghai as a world-class birding location.

RESOURCES

The sound-recordings and audio spectrograms below show clearly the difference in frequency between the calls of Sakhalin and Pale-legged Leaf Warbler.

Sakhalin Leaf Warbler Phylloscopus borealoides, Microforest 1 (30.953225, 121.959083), Cape Nanhui, 17 Sept. 2017 (01:03; 12.2 MB)

Audio spectrogram of call of Sakhalin Leaf Warbler.

Pale-legged Leaf Warbler P. tenellipes, Magic Parking LotCape Nanhui, 4 Sept. 2017 (00:19; 3.7 MB)

Audio spectrogram of call of Pale-legged Leaf Warbler.

Here are photos of the Sakhalin Leaf Warbler of 17 Sept. 2017. The bird below is the same individual whose voice I sound-recorded.

Sakhalin Leaf Warbler, Microforest 1, Cape Nanhui, Pudong, Shanghai, China, 17 Sept. 2017. (Craig Brelsford)
Sakhalin Leaf Warbler shows the classic features of the Pale-Sak species pair, among them an olive-brown crown contrasting with olive-green mantle and wings, a long and creamy supercilium, and faint wing bars on the median and greater coverts. (Craig Brelsford)
Sakhalin Leaf Warbler, Microforest 1, Cape Nanhui, Pudong, Shanghai, China, 17 Sept. 2017. (Craig Brelsford)
Like its sister species Pale-legged Leaf Warbler, Sakhalin Leaf Warbler has an affinity for sturdy, leafless branches. Here, the leaf warbler, drawn by playback of its own voice, is using the perch to investigate the source of the sound. (Craig Brelsford)
Sakhalin Leaf Warbler, Microforest 1, Cape Nanhui, Pudong, Shanghai, China, 17 Sept. 2017. (Craig Brelsford)
Like Pale-legged Leaf Warbler, Sakhalin Leaf Warbler pumps its tail steadily, often remaining otherwise motionless. (Craig Brelsford)

REFERENCES

Brelsford, Craig. Sakhalin & Pale-legged Leaf Warbler, Singing Together. Post to shanghaibirding.com published 5 May 2016.

———. Kamchatka Leaf Warbler in Shanghai. Post to shanghaibirding.com published 6 June 2017.

———. Separating Pale-legged & Sakhalin Leaf Warbler on Call. Post to shanghaibirding.com published 31 Aug. 2017.

———. Pale-Sak Calls: An Addendum. Post to shanghaibirding.com published 10 Sept. 2017.

Brelsford, Craig, & Du, Elaine. Boli County, Heilongjiang, May-June 2016: Part 1. Page on shanghaibirding.com last updated 1 Sept. 2017.

Round, Philip D. E-mail message to Craig Brelsford, 18 Oct. 2016. Round’s e-mail message was originally cited in the shanghaibirding.com post “Pale-legged Leaf Warbler & the Shanghai Big 5,” published 26 Sept. 2016.

Round, Philip D., Pierce, Andrew J., Saitoh, Takema, & Shigeta, Yoshimitsu. 2016. Addition of Kamchatka Leaf Warbler Phylloscopus examinandus and Sakhalin Leaf Warbler P. borealoides to Thailand’s Avifauna. Bulletin of the Japan Bird Banding Association 28: 9–21. Available here for download (708 KB) through shanghaibirding.com.

Weprincew, B. N., Leonowitsch, W. W. & Netschajew, W. A. 1989. Zur Lebensweise von Phylloscopus borealoides Portenko und Phylloscopus tenellipes Swinhoe. Mitteilungen aus dem Zoologischen Museum in Berlin 65 (Suppl.): 71–80. (German only)

Yap, F., Yong, D. L., Low, B., Cros, E., Foley, C., Lim, K. K. & Rheindt, F. E. 2014. First wintering record of the Sakhalin Leaf Warbler in South East Asia, with notes on vocalisations. BirdingASIA 21: 76–81. Downloadable here (accessed: 28 Sept. 2017).

Featured image: Sakhalin Leaf Warbler Phylloscopus borealoides, Cape Nanhui, Shanghai, 17 Sept. 2017. Craig Brelsford photographed and sound-recorded this individual, getting a rare record of the poorly known species in Earth’s Greatest City.