American oystercatcher

AmericanOystercatcher.jpg

American oystercatcher: Haematopus palliates

Taxonomic Classification

Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Charadriiformes
Family: Haematopodidae
Genus/Species: Haematopuspalliatus
Common Name: American oystercatcher

Listing Status

Federal Status: Not Listed
FL Status: State Species of Special Concern
FNAI Ranks: G5/S2 (Globally: Demonstrably Secure/State: Imperiled)
IUCN Status: LC (Least Concern)

Physical Description

The American oystercatcher is a shorebird species that is easily identified by its long, bright reddish-orange bill, yellow eyes, and distinct red eye ring.  These features are a contrast to the deep black-colored head, brown and black backside, and white belly.  The wings are characterized by a white “V” shape, which can be seen as they are in flight.  This large shorebird can reach 18 inches (45.7 centimeters) in length and a wingspan of 32 inches (81.3 centimeters) (National Audubon Society, n.d.).

Life History

The American oystercatcher is one of a few bird species that feed primarily on mollusks, although they will also eat jellyfish, worms, and insects.  Because of their preference for mollusks, oystercatchers inhabit coastal areas that support intertidal shellfish.  Oystercatcher bills act as strong shucking tools, used to loosen the adductor muscle (the muscle that keeps the shell closed) in the mollusks they eat.  Once the muscle is pried loose, the shell is easily opened.

In Florida, American oystercatchers nest in shallow scrapes in the sand or shell, often on open or sparsely vegetated beaches or spoil islands (islands developed from dredged up material).  Oystercatchers have also been known to nest on gravel rooftops like another shorebird species, the least tern.  Nesting begins in March and can extend through August.  Adult males and females take turns incubating the eggs, which generally hatch between 24 and 27 days.  Chicks are mobile and leave the nest within hours after hatching, though they remain dependant on adults for food for at least two months.  Young become flight capable around 35 days.

Habitat and Distribution

American Oystercatcher Distribution MapThe American oystercatcher inhabits beaches, sandbars, spoil islands, shell rakes, salt marsh, and oyster reefs.  Oystercatchers can be found from the coasts of the northeastern U.S. down to Florida’s Gulf Coast (Nol and Humphrey 1994).  Florida is home to both a resident breeding population and a large wintering population of American oystercatchers.  Oystercatchers can also be found on the Caribbean coast of Central America. (Nol and Humphrey 1994). 

Threats:

Many factors threaten the Florida population of American oystercatchers.  Coastal development and shoreline armoring have resulted in widespread habitat loss, leaving few suitable breeding sites.  Where breeding occurs, nests are vulnerable to disturbance by beachgoers, boaters, pets, predators, and severe weather events.  When breeding adults are disturbed, they will fly from their nest, leaving eggs and chicks vulnerable to the elements and waiting predators.  American oystercatchers are largely dependent on marine mollusks, which are particularly sensitive to changes in water quality.  Oil spills and pollutants can affect distribution and abundance of mollusks, which subsequently affects prey availability for oystercatchers.  Global climate change is an impending threat to American oystercatchers as the rise of sea level may further reduce coastal habitat.

Conservation and Management

American oystercatchers are protected by the U.S. Migratory Bird Treaty Act and as a State Species of Special Concern by Florida’s Endangered and Threatened Species Rule External Website.

In Florida, nests are often protected using symbolic fencing – temporary postings that provide a buffer against disturbance.  Documented nests are monitored regularly during the breeding season to determine productivity and assess management techniques.  The Florida Shorebird Alliance External Website, a statewide partnership for the conservation of shorebirds, coordinates posting, monitoring, and bird stewardship programs locally.

Biological Status Review (BSR) Adobe PDF
Supplemental Information for the BSR Adobe PDF

Other Informative Links

Birds of North America External Website
Encyclopedia of Life External Website
Florida Shorebird Alliance External Website
Florida Natural Areas Inventory External Website
FWC Species Profile
International Union for Conservation of Nature External Website
National Audubon Society External Website
The Cornell Lab of Ornithology External Website

 

Download

Printable version of this page Adobe PDF

References

National Audubon Society. (n.d.). American Oystercatcher. Retrieved March 2, 2011, from Audubon: http://birds.audubon.org/species/ameoys External Website.

Nol, E. and R.C. Humphrey. 1994. American Oystercatcher (Haematopus palliatus), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved March 2, 2011 from the Birds of North America Online: http://bna.birds.cornell.edu/bna/species/082/articles/introduction External Website.


Image Credit Photo by FWC



FWC Facts:
The Saltwater Fishing "Hot Sheet" gives the latest regulatory information for state and federal waters, as well as season updates and other current events in Marine Fisheries.

Learn More at AskFWC