Parana antwren (Stymphalornis acutirostris)

loading
Parana antwren
loading
Loading more images and videos...

Parana antwren fact file

Parana antwren description

KingdomAnimalia
PhylumChordata
ClassAves
OrderPasseriformes
FamilyThamnophilidae
GenusStymphalornis (1)

Only described as recently as 1995 (2) (3), the Parana antwren (Stymphalornis acutirostris) is a medium-sized, slender, marsh-dwelling bird, found only in a small area of Brazil (4) (5).

The male Parana antwren is typically dark chocolate brown to chestnut-olive on the upperparts and dull lead grey on the underparts (2) (5) (6). The forehead of the male Parana antwren is grey and there is a short, poorly-defined whitish line running from the bill towards the eye (2). There may be some faint white mottling on the chin and cheeks (2) (5). The wings of the male Parana antwren are dusky-grey (5), the flight feathers are edged chestnut-olive (2), and the black wing-coverts have bold white tips (2) (5) (6). The tail is usually blackish and has narrow white tips to the feathers (5) (6).

In contrast to the male, the female Parana antwren is paler brown on the upperparts, and appears generally greyer and more speckled around the face (5) (6). The underparts of the female are whitish and have distinctive coarse black streaks (2) (3) (5) (6). Both the wings and tail of the female Parana antwren are browner than in the male (5).

The song of the Parana antwren is a constant, emphatic series of whistled and repeated nasal ‘piu-píc’ or ‘píc-piu’ notes. Both the male and female Parana antwren also produce ‘nhééé’ calls and soft ‘pic’ contact calls (5).

Also known as
Marsh antwren.
Size
Length: 14 cm (2)
Weight
10 g (2)
Top

Parana antwren biology

Very little is known about the biology of the Parana antwren (4). It is usually found in pairs in areas of low, dense vegetation (2) (5), where it will forage for prey below heights of around 60 centimetres (5). It is an active species, moving around its marshy habitat by short hops and fluttery flights. These short forays are usually punctuated by short pauses while the Parana antwren scans for prey, which it takes from the leaves and stems of grass and reeds (2). The diet of the Parana antwren is though to consist almost exclusively of arthropods (2) (5).

The Parana antwren is not known to be particularly strong flier, and single flights of more than 25 metres have never been recorded (3).

Top

Parana antwren range

The Parana antwren is named after the small area of its discovery in coastal Paraná, Brazil (4). It has been found to inhabit several municipalities in Paraná state, as well as several additional municipalities in the neighbouring state of Santa Catarina (5) (6). The Parana antwren is generally restricted to the lowlands between Antonina Bay, Paraná, and the Itapocu River, Santa Catarina (3).

A small population of the Parana antwren may also occur at the Tiete River mouth in São Paulo, although the taxonomic status of this population is uncertain and it may actually represent a separate species (5).

Top

Parana antwren habitat

Alternatively known as the marsh antwren, the Parana antwren is almost entirely restricted to marshy habitats (4). It occurs primarily in littoral marshes (2) (4) (5), which are typically dominated by sedges, grasses and other herbaceous (non-woody) vegetation such as bulrush (Scirpus californicus) and cattail (Typha domingensis) (2) (3) (5) (6).

The Parana antwren is also found in marshes alongside rivers, as well as flooded plains and wet fields, the fringes of mangrove swamps and flooded lowland forests (2) (4) (5).

Top

Parana antwren status

The Parana antwren is classified as Endangered (EN) on the IUCN Red List (1).

IUCN Red List species status – Endangered

Top

Parana antwren threats

Constant human pressure is putting the Parana antwren’s habitat at risk, and many areas have already been reduced or destroyed by fires, allotments and landfills. Land acquisition, as well as disturbance and erosion due to boat traffic and sand extraction along river margins, also threatens the Parana antwren and may further reduce its available habitat (5).

Cattle grazing and invasive vegetation, particularly exotic grasses such as Urochloa arrecta and Brachiaria mutica, also pose additional threats to this species’ already vulnerable habitat (3) (5). Rising sea levels are also becoming of increasing concern and could greatly diminish the area of suitable habitat in future (5).

Top

Parana antwren conservation

Although proposals for the conservation of the Parana antwren have been put to government agencies in Brazil, no action has yet been taken (5).

Recommended conservation measures for the Parana antwren include protecting key areas of its habitat, as well as carrying out long-term monitoring to determine its population trends (5).

Further studies are needed to find out more about this species’ biology, and to clarify its taxonomic status in São Paulo (5).

Top

Find out more

Find out more about the Parana antwren: 

Top

Authentication

This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:
arkive@wildscreen.org.uk

Top

Glossary

Arthropods
A very diverse phylum (a major grouping of animals) that includes crustaceans, insects and arachnids. All arthropods have paired jointed limbs and a hard external skeleton (exoskeleton).
Flight feathers
The feathers at the end of the wing, involved in flight.
Littoral
Shallow marine habitats subject to cycles of submersion and exposure by tides.
Taxonomic
Relating to taxonomy, the science of classifying organisms, grouping together animals which share common features and are thought to have a common ancestor.
Wing-coverts
Small feathers which cover the bases of other larger feathers, helping to smooth airflow over the wings.
Top

References

  1. IUCN Red List (April, 2012)
    http://www.iucnredlist.org/
  2. del Hoyo, J., Elliott, A. and Christie, D. (2003) Handbook of the Birds of the World. Volume 8: Broadbills to Tapaculos. Lynx Edicions, Barcelona.
  3. Reinert, B.L., Bornschein, M.R. and Firkowski, C. (2007) Distribuição, tamanho populacional, hábitat e conservação do bicudinho-do-brejo Stymphalornis acutirostris Bornschein, Reinert e Teixeira, 1995 (Thamnophilidae). Revista Brasileira de Ornitologia, 15(4): 493-519.
  4. Schulenberg, T.S. (Ed.) (2011) Parana antwren (Stymphalornis acutirostris) In: Neotropical Birds Online. Cornell Lab of Ornithology, Ithaca. Available at:
    http://neotropical.birds.cornell.edu/portal/species/overview?p_p_spp=384531
  5. BirdLife International (April, 2012)
    http://www.birdlife.org/datazone/speciesfactsheet.php?id=9791
  6. Ridgley, R.S. and Tudor, G. (2009) Field Guide to the Songbirds of South America: The Passerines. University of Texas Press, Texas, USA.
X
Close

Image credit

Parana antwren  
Parana antwren

© Carlos Gussoni

Carlos Gussoni
cogussoni@gmail.com

X
Close

Link to this photo

ARKive species - Parana antwren (Stymphalornis acutirostris) Embed this ARKive thumbnail link ("portlet") by copying and pasting the code below.

Terms of Use - The displayed portlet may be used as a link from your website to ARKive's online content for private, scientific, conservation or educational purposes only. It may NOT be used within Apps.

Read more about

X
Close

MyARKive

MyARKive offers the scrapbook feature to signed-up members, allowing you to organize your favourite ARKive images and videos and share them with friends.

Play the Team WILD game:

Team WILD, an elite squadron of science superheroes, needs your help! Your mission: protect and conserve the planet’s species and habitats from destruction.

Conservation in Action

Which species are on the road to recovery? Find out now »

This species is featured in:

This species is affected by global climate change and has been profiled with the support of Bank of America Merrill Lynch. To learn more visit our climate change pages.

Help us share the wonders of the natural world. Donate today!

Blog