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Roseate tern: Sterna dougallii dougallii

Taxonomic Classification

Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Ciconiiformes
Family: Laridae
Genus/Species: Sterna dougallii
Subspecies: Sterna dougallii dougallii
Common Name: Roseate tern

Listing Status

Federal Status: Threatened
FL Status: Federally-designated Threatened
FNAI Ranks: G4/S1 (Globally: Apparently Secure/State: Critically Imperiled)
IUCN Status: LC (Least Concern)

Physical Description

The roseate tern is a mid-sized tern that can reach a length of 15.7 inches (40 centimeters) with a wingspan of 23.6 inches (60 centimeters) (U.S. Fish & Wildlife Service 1999).  This species has a black cap, gray upperparts, white underparts, and a white forked tail.  Roseate terns have a thin black bill which becomes red during the breeding season (Florida Natural Areas Inventory 2001).

Life History

The diet of the roseate tern primarily consists of small fish (ex. sand lance, hake, and herrings) and some invertebrates (National Audubon Society, n.d.). 

Roseate terns breed and nest in colonies along with other terns (National Audubon Society, n.d.).  They embark upon breeding grounds at the end of April (Spendelow 1995).  During courtship, males will fly with a fish in its bill while letting out advertising calls to attract females.  Males will also feed females as a courtship ritual (Gochfield et al. 1998).  The availability of small fish seems to determine to approximate time the roseate tern nests.  The Caribbean population (includes Florida’s population) lays up to two eggs in the middle part of May (National Audubon Society, n.d., Shealer 1992 as cited in Gochfield et al. 1998).  The total incubation period for eggs is two to three weeks.  Young roseate terns are able to fledge four weeks after hatching and are able to leave their parents around two months of age (Gochfield et al. 1998).    

Habitat and Distribution

Rosete Tern Distribution Map

The roseate tern nests in broken coral deposits, bare limestone, shell/sandy beaches, newly deposits of mudstone and rock, and rooftops.  This species can be found from Nova Scotia, south to the Florida Keys, and on islands throughout the Caribbean.  Roseate terns can also be found in Australia, Indonesia, southern Africa, northern Europe, the Azores, and the British Isles (Florida Natural Areas Inventory 2001).

Threats:

The main threat to the roseate tern is human disturbance during nesting (U.S. Fish & Wildlife Service 1999).  The collecting of eggs from roseate tern nests has caused the elimination of colonies in the Virgin Islands and other islands in the tropics (Gochfield et al. 1998).  Increases in gull populations are a threat to the roseate tern as the gull’s aggressive nature can cause terns to desert their nests (National Audubon Society, n.d.).  Hunting is a threat to the South American population as hunting occurs on their winter grounds (National Audubon Society, n.d.).

Conservation and Management

The roseate tern is protected by the U.S. Migratory Bird Treaty Act.  It is also protected as a Threatened species by the Federal Endangered Species Act and as a Federally-designated Threatened species by Florida’s Endangered and Threatened Species Rule External Website.

Federal Recovery Plan External Website

Other Informative Links

Birds of North America External Website
Florida Natural Areas Inventory External Website
National Audubon Society External Website
New York Department of Environmental Conservation External Website
The Cornell Lab of Ornithology External Website
U.S. Fish & Wildlife Service Multi-Species Recovery Plan for South Florida External Website

 

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References

Florida Natural Areas Inventory.  2001.  Field guide to the rare animals of Florida. http://www.fnai.org/FieldGuide/pdf/Sterna_dougallii.PDF External Website

Gochfeld, Michael, Joanna Burger and Ian C. Nisbet. 1998. Roseate Tern (Sterna dougallii), The Birds of North America Online (A. Poole, Ed.).Ithaca: Cornell Lab of Ornithology Retrieved from the Birds of North America Online: http://bna.birds.cornell.edu/bna.html/species/370 External Website

National Audubon Society. (n.d.). Roseate Tern. Retrieved September 6, 2011, from Audubon: http://birds.audubon.org/species/roster External Website

Shealer, D. A. 1992. Behavioral and ecological factors affecting reproductive success in a threatened population of tropical Roseate Terns. External Website Master's Thesis. Rutgers Univ., New\ Brunswick, NJ. as cited in Gochfeld, Michael, Joanna Burger and Ian C. Nisbet. 1998. Roseate Tern (Sterna dougallii), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology  Retrieved from the Birds of North America Online: http://bna.birds.cornell.edu/bna.html/species/370 External Website

Spendelow, J. A. (1995, March). Roseate Tern Fact Sheet. Retrieved September 6, 2011, from U.S. National Biological Service: http://www.mbr-pwrc.usgs.gov/mbr/tern2.htm External Website

The Cornell Lab of Ornithology. (n.d.). Roseate tern. Retrieved September 6, 2011, from All About Birds: http://www.allaboutbirds.org/guide/roseate_tern/id External Website

U.S. Fish & Wildlife Service. (1999, May). Roseate Tern. Retrieved September 6, 2011, from Multi-Species Recovery Plan for South Florida: http://www.fws.gov/verobeach/MSRPPDFs/RoseateTern.pdf External Website


Image Credit Photo courtesy of Kirk Rogers, USFWS



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