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Dunlin

The Dunlin (Calidris alpina) is a small migratory shorebird in the sandpiper family Scolopacidae, renowned for its long, slightly down-curved bill adapted for probing mudflats.^[1] It measures 16–22 cm in length, has a wingspan of 36–38 cm, and weighs 49–76 g, making it one of the more compact species among calidrid sandpipers.^[1] In breeding plumage, adults display a vivid rusty back with black feather edges and a distinctive black belly patch, while nonbreeding and juvenile birds adopt a more subdued gray-brown ("dun") coloration overall.^[2] This plumage variation aids in camouflage on tundra breeding grounds and coastal wintering sites, respectively.^[2] Dunlins breed across high-arctic and subarctic regions worldwide, including northern Alaska, Canada, Greenland, Iceland, the Faroe Islands, northern Europe, and Siberia extending to Sakhalin and the Kuril Islands, favoring moist tundra, wet sedge marshes, and coastal grasslands.^[3] They undertake extensive migrations, with populations from North America wintering along the Atlantic, Pacific, and Gulf coasts from southern Alaska to Central America, while Eurasian birds head to western Europe, northwest Africa, the Arabian Peninsula, and South and East Asia, often gathering in massive flocks on estuarine mudflats, lagoons, and sandy beaches.^[3] During migration, they pass over much of North America and Eurasia, utilizing a variety of wetland habitats including flooded fields and lake shores.^[2] These birds forage in flocks by rapidly running across exposed mudflats, using their bills to extract invertebrates such as insects, crustaceans, and worms from just below the surface, with feeding rates increasing dramatically in groups for efficiency.^[2] Nesting occurs in shallow scrapes on the ground, typically producing four eggs per clutch in late spring or early summer.^[3] Globally abundant with an estimated 3–7 million mature individuals, the dunlin faces declining populations due to habitat loss from coastal development, climate change impacts on tundra breeding sites, and hunting pressures, leading to its classification as Near Threatened on the IUCN Red List.^[3]

Taxonomy

Etymology and Classification

The common name "dunlin" derives from the Old English term "dunling," a compound of "dun" (referring to a dull brownish-gray color) and the diminutive suffix "-ling," meaning "little dun-colored one," which aptly describes the bird's subdued winter plumage.^[2] This name was first recorded in 1531–1532 and has been in use since to reflect the species' overall brownish tones across seasons.^[4] The genus name Calidris originates from the Ancient Greek kalidris or skalidris, a term employed by Aristotle to denote a gray-colored waterside bird, aligning with the genus's members as small, grayish shorebirds.^[5] The dunlin was originally described by Carl Linnaeus in 1758 as Tringa alpina in his Systema Naturae, placing it among the larger sandpipers in the genus Tringa.^[6] It was later reclassified into the genus Calidris within the family Scolopacidae, a change formalized in the early 19th century to better group small "stint-like" sandpipers based on morphology, with the current binomial Calidris alpina widely adopted by the mid-20th century.^[7] Historically, the dunlin was sometimes segregated with other small calidrines into the genus Erolia (e.g., as Erolia alpina in early 20th-century checklists), reflecting debates over whether such species formed a distinct lineage from larger Tringa shanks.^[6] Molecular studies in the 2010s have confirmed the dunlin's phylogenetic position within the monophyletic genus Calidris, closely related to other small sandpipers such as the sanderling (Calidris alba), based on multi-gene analyses resolving relationships across the Scolopacidae subfamily.^[8] For instance, mitochondrial DNA (mtDNA) sequencing of cytochrome b and control regions from global samples revealed four major clades corresponding to subspecies groups, with significant genetic differentiation (ΦST = 0.773) supporting the species' placement amid gene flow between populations.^[9] These findings resolved earlier taxonomic uncertainties, such as the separation of stint-like species, leading to updates in authoritative lists like the IOC World Bird List through version 14.1 in 2024, which maintains Calidris alpina as a single polytypic species with up to 10 subspecies.^[10]

Subspecies

Ten subspecies of the dunlin are currently recognized, varying in breeding and wintering ranges, morphology, and genetics. These reflect adaptations to different arctic and subarctic environments, with genetic studies identifying five major lineages based on mtDNA analyses.^[7] The subspecies are as follows:

Description

Physical Characteristics

The Dunlin (Calidris alpina) is a small to medium-sized shorebird, measuring 16–22 cm in length, with a wingspan typically 32–40 cm and a body weight ranging from 45–80 g, though this can vary by subspecies, sex, and season, with individuals sometimes reaching up to 77 g during pre-migratory fattening.^[1]^[11] Measurements and bill length vary among subspecies; for example, the Pacific subspecies C. a. pacifica has a longer bill (up to 4.5 cm) and larger body size compared to the smaller Arctic C. a. arctica. The bill is notably long and slightly drooping, typically 2.5–4 cm in length (longer in some subspecies), adapted for probing into soft substrates. Its legs are short and black, suited for wading in shallow water, while the overall build is stocky with a short neck and pointed wings.^[1]^[11] Plumage varies markedly across seasons and life stages. Breeding adults exhibit striking rufous-brown upperparts with black-centered feathers on the back and scapulars, a prominent black belly patch, and white underparts often stippled with dark spots; white wing bars are visible in flight. In non-breeding plumage, the bird appears more subdued, with gray-brown upperparts, a pale gray head and breast, and clean white underparts lacking the belly patch. Juveniles display a scaled pattern on the upperparts with buff-fringed black and rusty-brown feathers, pale underparts, and subtle buffy scaling on the breast, transitioning to adult-like plumage after the post-juvenile molt.^[1]^[12]^[11] Sexual dimorphism is minimal in plumage, with both sexes sharing similar coloration patterns, though females are slightly larger than males in body size, bill length, and wingspan, a common trait among scolopacid shorebirds. The Dunlin undergoes a complete prebasic molt after breeding that produces the winter plumage, often completed on or near the breeding grounds, and an incomplete prealternate molt prior to the next breeding season that restores much of the vibrant summer feathers, sometimes suspended during migration.^[11]^[12] Key anatomical features enhance its foraging efficiency. The long, flexible bill contains specialized Herbst corpuscles at the tip, enabling tactile detection of buried prey such as invertebrates in mud or sand without relying solely on vision, which supports nocturnal and low-light feeding. The short legs facilitate stable movement in shallow intertidal zones, preventing sinking in soft sediments while allowing rapid stitching motions during probe foraging.^[11]^[1]

Vocalizations and Displays

The Dunlin produces a variety of vocalizations for communication, including alarm and contact calls that alert flock members to potential threats. The primary alarm call is a high-pitched, scratchy "krree" or "cheerp," often given during flight or in response to disturbances, serving as a warning signal to initiate evasive maneuvers.^[13]^[12] Contact and flight calls typically consist of softer, repetitive notes such as a rapid "trr-trr" trill or chattering sequence, used to maintain cohesion in flocks or during foraging.^[13]^[4] During the breeding season, male Dunlins perform elaborate displays to attract mates and defend territories, combining vocalizations with visual elements. Aerial displays involve steep ascents followed by slow, circling flights with fluttering wingbeats resembling a butterfly pattern, accompanied by a harsh, trilling song of drawn-out burry notes that descend into a twittering trill.^[11]^[12] On the ground, males engage in territorial posturing, such as advancing with wings raised or performing bowing motions that expose the black belly patch, while emitting aggressive trills or short, melodic calls upon landing.^[11]^[12] These displays often incorporate wing-clapping or rapid beats to emphasize the performance. Vocalizations vary by context and location; for instance, calls in non-breeding flocks are softer and more subdued for coordination, whereas breeding trills become louder and more aggressive during disputes. Subspecies differences are minimal.^[13]^[11] Audio analyses from the Cornell Lab of Ornithology confirm variation in Dunlin calls and songs, aiding detection over tundra or coastal habitats.^[13]

Distribution and Habitat

Breeding Distribution

The Dunlin (Calidris alpina) exhibits a circumpolar breeding distribution across high Arctic and subarctic tundra regions of the Holarctic, spanning from Alaska eastward through northern Canada to Greenland, and from Scandinavia and Iceland across northern Europe and Siberia to the Kuril Islands. In North America, breeding occurs primarily on coastal tundra from southwestern Alaska and the Aleutian Islands northward and eastward to James Bay in Canada. Southern breeding limits extend to the Baltic states for the subspecies C. a. schinzii, which also nests in southeastern Greenland, Iceland, the [Faroe Islands](/page/Faroe Islands), and northern Europe.^[3]^[14]^[15] Breeding ranges vary by subspecies, with C. a. pacifica occupying lowlands along the Alaskan Pacific coast and associated tundra, while C. a. alpina is found along the edges of Eurasian taiga and subarctic wetlands. These distributions align with the short Arctic summer window, where brief periods of daylight and insect abundance support nesting and chick-rearing.^[16]^[9] Preferred nesting habitats consist of moist tundra characterized by mosses, sedges, grasses, and shallow ponds or boggy areas interspersed with surface water, such as tussock tundra, hummocks, low ridges, and wet meadows. Dunlins avoid dense vegetation, favoring open, boggy ground that provides camouflage and access to invertebrate prey. Most breeding occurs at lower elevations near coasts.^[17]^[12]^[3]^[11] Breeding is closely tied to the ephemeral conditions of Arctic summers, but recent climate warming has prompted northward shifts in distribution for Arctic-breeding shorebirds, including the Dunlin, as shrub encroachment reduces suitable open tundra habitat at southern edges. Studies from 2020–2024 indicate these shifts are driven by advancing treelines and altered vegetation patterns, potentially contracting available breeding areas in subarctic zones. A 2025 study further shows that Dunlin and other Arctic shorebirds are advancing nesting phenology by 0 to 0.4 days per day of warming, demonstrating adaptive responses to climate change. Recent reports as of February 2025 highlight steep declines in Icelandic Dunlin populations over the past 12 years, underscoring ongoing challenges to southern breeding ranges.^[18]^[19]^[20]

Non-breeding Distribution and Migration

The Dunlin (Calidris alpina) exhibits a broad non-breeding distribution, primarily occupying coastal mudflats, estuaries, and intertidal zones in temperate and subtropical regions worldwide during the boreal winter. Key wintering areas include the Wadden Sea in western Europe, where large numbers of the subspecies C. a. alpina and C. a. schinzii congregate; the Yellow Sea region in East Asia, serving as a vital site for C. a. arcticola, C. a. sakhalina, and C. a. kistchinski; and the Atlantic and Gulf Coasts of North America, frequented by C. a. hudsonia and C. a. pacifica. In Africa, northwest coastal sites such as Banc d'Arguin in Mauritania host birds from European breeding populations, while some Asian breeders overwinter in southern Japan, Taiwan, the Philippines, or the South China Sea, including for C. a. actites.^[3]^[21]^[22] Migration from Arctic and subarctic breeding grounds involves long-distance travel, with annual round-trip distances reaching up to 15,000 km for some populations, though leg distances typically range from 4,000 to 7,000 km depending on subspecies and route. North American C. a. hudsonia follows either the Atlantic or Mississippi Flyway southward, using staging areas like James Bay, Ontario, and Delaware Bay for refueling, while C. a. pacifica and C. a. arcticola from Alaska may take direct overwater flights across the Gulf of Alaska or head to East Asia. European C. a. schinzii migrates rapidly along the Atlantic coast via the Iberian Peninsula to northwest Africa, stopping at the Wadden Sea and French coasts, whereas East Asian populations utilize the East Asian-Australasian Flyway, with the Yellow Sea acting as a central hub for multiple subspecies. Some shorter-distance movements occur, such as Alaskan breeders wintering along the Pacific Coast of North America.^[23]^[24]^[25]^[21]^[22] Southward migration typically begins post-breeding in August to October, with arrival at wintering sites by late October to December; for instance, C. a. hudsonia takes about 69 days on average, while East Asian C. a. arcticola requires around 65 days with multiple stops. Return northward migration occurs from April to June, often more direct and faster—lasting about 26 days for C. a. hudsonia—with departures synchronized around mid-May for East Asian subspecies. Flocks can number in the tens of thousands during passage, particularly at key stopovers like Delaware Bay or the Yellow Sea mudflats. Sex-specific patterns influence timing, with males departing breeding areas earlier in fall and using more direct spring routes than females in North American populations.^[24]^[21]^[3] Geolocator tracking studies from 2010 to 2019, involving over 84 individuals on the East Asian Flyway and others in North America, reveal route variations by subspecies, such as eastern paths for C. a. arcticola versus western for C. a. sakhalina, and highlight the Yellow Sea's role in connecting breeding origins to diverse wintering grounds. Challenges include the degradation and loss of stopover sites, such as intertidal mudflats in the Yellow Sea, which threaten refueling opportunities for long-distance migrants. Ring recovery data further confirm these patterns, showing distinct connectivity for European and Asian populations.^[21]^[24]^[22]^[26]

Behavior and Ecology

Foraging and Diet

The Dunlin (Calidris alpina) employs a variety of foraging techniques adapted to its intertidal and tundra habitats, primarily involving rapid pecking at surface prey and deeper probing into mud or soil for buried invertebrates. A distinctive "stitching" method, where the bill is inserted shallowly and moved side-to-side in a sewing-like motion, allows detection of subsurface prey through tactile cues, particularly during low tides when feeding grounds are exposed.^[12] These birds are predominantly diurnal foragers, though they may feed nocturnally in certain conditions, with activity peaking in soft sediments where penetrability facilitates efficient probing.^[27] During the breeding season on Arctic tundra, the Dunlin's diet shifts to terrestrial invertebrates, dominated by insects such as midges (Chironomidae), beetles (Coleoptera), and craneflies (Tipulidae), supplemented by spiders (Araneae). This high-protein intake supports the energetic demands of reproduction, with adults consuming thousands of small items daily to achieve sufficient caloric intake for egg production and territory defense. In contrast, non-breeding diets in coastal estuaries and mudflats consist mainly of marine invertebrates, including polychaete worms (Hediste diversicolor), mollusks like the gastropod Hydrobia ulvae and bivalve Scrobicularia plana, and crustaceans such as shrimp (Crangon crangon); during severe winters, birds may opportunistically consume seeds and plant matter when invertebrate availability declines.^[27]^[28] Key adaptations enhance foraging efficiency, notably the high density of sensory pits in the bill tip—up to several hundred Herbst corpuscles per square millimeter—that detect vibrations from hidden prey, enabling tactile foraging even in turbid or dark conditions.^[29] Intake rates vary seasonally, averaging around 200–350 J/min of energy in estuarine habitats. Foraging observation studies from the 2010s have revealed dietary shifts, showing that migrants achieve 65% higher energy intake in spring compared to winter through prey selection for more profitable surface-active items.^[28]

Breeding Biology

The Dunlin exhibits a primarily monogamous mating system, with pairs forming briefly for the breeding season on arctic and subarctic tundra habitats. Males typically arrive at breeding grounds first in late May or early June, establishing territories through aerial display flights involving short glides with stiff arched wings interrupted by rapid, shallow wing flutters. Pair bonds are territorial and last only until the female initiates a second clutch or departs, with extra-pair copulations rarely observed.^[30]^[31] Nesting occurs in shallow ground scrapes, often on dry upland tundra near wetlands, created by the male and lined by the female with lichens, moss, grass, or willow leaves for camouflage and insulation. Clutches consist of 4 olive-buff to pale green eggs, blotched with brown, measuring approximately 35–37 mm in length and 24 mm in width, laid at intervals of about one per day from late May to early July depending on latitude. Incubation begins with the completion of the clutch and lasts 21–22 days, shared by both sexes, though the female often handles the initial half before departing to allow for potential renesting or sequential mating.^[32]^[33]^[34] Upon hatching, which peaks in early to mid-July, chicks are precocial, downy, and mobile within hours, following the male parent—who assumes primary brooding and protection duties—to nearby wet areas for foraging, as the female typically deserts soon after hatch. Males lead and defend the brood for about 21 days until fledging, after which family units disband. Chicks fledge at around 19–25 days old, capable of short flights but remaining dependent on the male for guidance. In some cases, females exhibit facultative polyandry, laying a second clutch with a new mate after deserting the first, potentially increasing their reproductive output to two broods per season.^[11]^[35] Clutch success varies by predation pressure and weather, with hatching rates typically ranging from 30% to 50% in low-disturbance areas; primary losses stem from predation by arctic foxes (Vulpes lagopus) and red foxes (Vulpes vulpes), which target nests during lemming low cycles, alongside avian predators like jaegers and gulls. Renesting is common, with 75% of females attempting a replacement clutch after early-season failure, though success declines later due to time constraints. Overall, annual productivity is influenced by these factors, with males investing heavily in single-brood care to maximize chick survival.^[35]^[36]^[37] Dunlins exhibit highly gregarious behavior outside the breeding season, forming flocks that enhance foraging efficiency and predator detection. On coastal feeding grounds, groups typically range from 10 to 500 individuals, allowing coordinated probing of intertidal mudflats for invertebrates.^[38] At high tide roosts, flock sizes can swell to thousands or even hundreds of thousands, with extreme concentrations reaching over a million birds at major estuaries like those along the Pacific Flyway.^[30] These large aggregations often engage in synchronized flight displays, characterized by rapid, twisting maneuvers that confuse aerial predators such as merlins (Falco columbarius), reducing individual capture risk through collective evasion tactics.^[39] During the breeding season, Dunlins shift to territorial behavior, with males primarily defending nesting areas against intruders to secure resources and mates. Territories vary by habitat density but typically encompass 100–200 m² around the nest site in high-density arctic tundra populations, where males patrol boundaries through aerial chases and ground displays.^[32] Following successful breeding, adults undergo post-breeding dispersal to molting sites, often moving tens to hundreds of kilometers from nesting grounds to coastal or inland wetlands rich in food resources; for instance, Alaskan breeders may relocate within a 130 km radius during this period of feather replacement.^[40] Interspecific and intraspecific interactions among Dunlins involve displays of aggression, primarily through high-speed chases to displace rivals from prime foraging or roosting spots, with rates varying from 0.005 to 5.08 interactions per minute depending on habitat crowding.^[30] Hybridization occurs rarely with closely related calidrids, such as the purple sandpiper (Calidris maritima), with apparent cases reported in Europe.^[41] Daily movements of non-breeding Dunlins are closely tied to tidal cycles along coastal habitats, where birds follow receding tides to expose foraging areas and retreat to elevated roosts during inundation, covering distances of several kilometers in a single cycle.^[34] Seasonal shifts include broader dispersals to wintering ranges, but local vigilance remains key to survival; in flocks, individuals alternate scanning for threats, functioning as informal sentinels that alert the group to predators via alarm calls, thereby diluting per capita risk through shared monitoring.^[42]

Conservation

Population Trends

The global population of the Dunlin (Calidris alpina) is estimated at 3,000,000–7,000,000 mature individuals, with the overall trend decreasing at a moderate rate of 20–29% over the past three generations (20 years; 2007–2027).^[3] Populations remain stable in the core Arctic breeding areas, but significant declines have occurred at southern edges of the range, particularly in temperate zones.^[3] In North America, breeding populations total approximately 1.5 million individuals across subspecies (C. a. arcticola, pacifica, and hudsonia), with trends generally steady but showing localized declines in some regions.^[43] The southern subspecies C. a. schinzii has experienced severe declines in Europe, with an estimated 90% reduction since the early 20th century.^[3] For example, in Denmark, breeding pairs numbered around 50,000 circa 1900 but had fallen to approximately 150 pairs as of recent estimates (circa 2023), reflecting broader patterns across the Baltic and western Europe where the total schinzii population in the Baltic region is now approximately 500 breeding pairs as of 2021.^[44]^[45]^[46] These subspecies-specific trends align with genetic structuring observed in long-distance migrant populations.^[47] Monitoring efforts include aerial surveys such as the Program for Regional and International Shorebird Monitoring (PRISM) in North America and coordinated counts by Wetlands International through the International Waterbird Census (IWC), which track non-breeding aggregations exceeding 3 million individuals in some regions between 2020 and 2024.^[3]^[48] Data from 2015–2024 indicate annual declines of 1–5% in key southern breeding sites, contributing to the species' moderate global reduction.^[3] Climate-driven habitat shifts are influencing population dynamics, with some northern Arctic populations potentially increasing due to expanding suitable tundra as southern habitats warm and fragment.^[49] This northward range expansion may offset losses in peripheral areas, though fragmentation risks persist for isolated southern groups.^[50]

Threats and Management

The Dunlin (Calidris alpina) faces multiple threats that contribute to its ongoing population decline, primarily driven by habitat degradation and loss across its breeding, migration, and wintering grounds. Coastal development, including land reclamation for aquaculture, urbanization, and infrastructure, has severely impacted intertidal mudflats, with over 65% of tidal flats in the Yellow Sea lost since the 1950s, a critical stopover site for the species along the East Asian-Australasian Flyway.^[51] Climate change exacerbates these pressures by altering Arctic tundra breeding habitats through permafrost thaw, increased storm frequency, and shifts in vegetation, which reduce nesting success and food availability.^[3] Additionally, illegal or unregulated hunting persists in parts of the East Asian-Australasian Flyway and the Arabian Peninsula, where thousands of shorebirds are harvested annually, posing a direct mortality risk during migration.^[3] Secondary threats include pollution from oil spills and industrial runoff, which contaminate foraging areas and affect prey populations, as well as human disturbance at key stopover sites that disrupts feeding and increases energy expenditure.^[52] Predation pressure has intensified in breeding areas due to fluctuations in Arctic fox (Vulpes lagopus) populations, driven by climate-induced changes in lemming cycles that lead to predator booms and higher nest predation rates on shorebirds.^[50] The International Union for Conservation of Nature (IUCN) assesses the Dunlin as Near Threatened globally, a status upgraded in the 2024 assessment due to a moderate rapid decline of 20–29% over three generations, reflecting cumulative threats across flyways.^[53] Certain subspecies, such as C. a. schinzii in the Baltic region, are regionally endangered, with populations reduced by over 50% in recent decades owing to habitat loss and low breeding success.^[15] Conservation management focuses on habitat protection and restoration through international cooperation. Key protected areas include the Wadden Sea, a UNESCO World Heritage Site and Ramsar wetland spanning Denmark, Germany, and the Netherlands, which supports over 10 million migratory shorebirds annually, including significant Dunlin numbers, and safeguards essential wintering and stopover habitat.^[54] The species is covered by agreements such as the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA), which promotes flyway-wide protections, and the Convention on Migratory Species (CMS), facilitating coordinated actions across 120+ range states.^[55] Restoration initiatives, such as China's national program to eradicate 90% of invasive smooth cordgrass (Spartina alterniflora) from Yellow Sea mudflats by 2025, aim to reclaim degraded foraging areas and enhance tidal flat functionality.^[3] Ongoing research, including geolocator tagging along the East Asian-Australasian Flyway, informs targeted conservation by mapping migration routes and identifying priority sites for intervention.^[56]

References

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### Migration and Wintering of Baltic Dunlins (Calidris alpina schinzii)
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Dazzling in its breeding finery, with vivid rusty back and black belly patch, the Dunlin was once called the Red-backed Sandpiper.
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[35]
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At dusk, Dunlins coalesced into flocks of lO-. 500 birds which flew back and forth at the edge of the marsh vegetation, eventually breaking into smaller groups ...Missing: post- | Show results with:post-
[36]
Merlin Predation on Wintering Dunlins: Hunting Techniques ...
Dunlins exhibited three distinct types of synchronized predator evasion flights. Dunlins isolated from flocks were often pursued and captured. The most ...Missing: displays | Show results with:displays
[37]
Residency Times and Patterns of Movement of Postbreeding Dunlin ...
Throughout this postbreeding period, during which Dunlin were molting, most birds were relocated within a 130 km radius of their capture site on the YKD ...
[38]
An apparent hybrid sandpiper in Thailand - Sibley Guides
Feb 23, 2010 · An apparent Dunlin x Purple Sandpiper from England in Nov 1993 is described with photos here. Apparent Buff-breasted X White-rumped or Baird's ...Missing: cases | Show results with:cases
[39]
[PDF] Dunlins Calidris alpina
The results show that central Dunlins within larger flocks devote less time to vigilant behaviour and more time to feeding (higher probing rate) than more ...
[40]
(PDF) Conservation plan for Dunlin with breeding populations in ...
Population estimates for three subspecies of Dunlin that breed in North America. Subspecies Estimated population Range of estimate Reference. C. a. arcticola ...
[41]
Dunlin/Baltic dunlin | Kongeåen
A subspecies of dunlin has been named the Baltic dunlin. As a breeding bird, the numbers have fallen dramatically in Denmark; there were about 50,000 breeding ...<|control11|><|separator|>
[42]
Summary 2018-2023 - novana.au.dk - Aarhus Universitet
Dunlin breed in Denmark ... It was previously widespread in West and North Jutland, but declined sharply from the mid-1900s, and in 2021, 21 pairs were registered ...
[43]
Genetic differentiation in an endangered and strongly philopatric ...
Jun 19, 2021 · By the start of the twenty-first century, the population size of the Baltic Southern Dunlin had declined to 1110–1360 breeding pairs [17].<|control11|><|separator|>
[44]
Demography and Populations - Dunlin - Calidris alpina
Jun 21, 2018 · In southern Finland, one-third of all birds first breed at age 1 yr; in northern Finland, almost all breed at age 2 yr (157 Soikkeli, M. (1967).Missing: sources | Show results with:sources
[45]
International Waterbird Census - iwc@wetlands.org
The table below provides summaries of counts from the International Waterbird Census (IWC) between 2020-2024. ... Calidris alpina, Dunlin, 3,179,652, 1,456,744 ...
[46]
Climate‐related range shifts in Arctic‐breeding shorebirds - Anderson
Feb 7, 2023 · Bird population trends are linearly affected by climate change along species thermal ranges. Proceedings of the Royal Society B: Biological ...
[47]
Species showcase: Dunlin | IUCN UK Peatland Programme
Globally, the overall population trend is decreasing, with loss of breeding habitat through the afforestation of moorland and nest predation listed as key ...
[48]
Rapid population decline in migratory shorebirds relying on Yellow ...
Apr 13, 2017 · We assess population trends of ten shorebird taxa that refuel on Yellow Sea tidal mudflats, a threatened ecosystem that has shrunk by >65% in recent decades.Missing: Dunlin | Show results with:Dunlin
[49]
Conservation and Management - Dunlin - Calidris alpina
Oct 24, 2023 · Not globally threatened (Least Concern). Effects of Human Activity. Habitat Loss and Degradation. Relatively little breeding habitat has ...Missing: endangered | Show results with:endangered
[50]
[PDF] Table 7: Species changing IUCN Red List Status (2022–2024)
Oct 28, 2024 · ... conservation dependent, NT - Near Threatened (includes LR/nt - Lower ... Dunlin. LC. NT. G. 2024-2. BIRDS. Calidris falcinellus. Broad-billed ...
[51]
Breeding and migratory birds - the Wadden Sea World Heritage
... Wadden Sea Region. According to the Ramsar Convention the Wadden Sea is essential for the existence of at least 52 populations of 41 migratory waterbird ...
[52]
https://birdsoftheworld.org/bow/species/dunlin/cur/conservation
[53]
Results from recent shorebird study provide 'huge leap forward' in ...
Nov 20, 2022 · This work will make it easier to understand the threats Dunlin face and why certain subpopulations experience more or less decline than others.