
Overview
- Species Common Name Caspian Tern
- Species Scientific Name Hydroprogne caspia
- State Listing Status Sensitive
Ecoregions

Coast Range
Oregon’s Coast Range, known for its dramatic scenery, is extremely diverse, with habitats ranging from open sandy dunes to lush forests and from tidepools to headwater streams. It follows the coastline and extends east through coastal forest to the border of the Willamette Valley and Klamath Mountains ecoregions

East Cascades
The East Cascade ecoregion extends from the Cascade Mountains’ summit east to the warmer, drier high desert and down the length of the state. This ecoregion varies dramatically from its cool, moist border with the West Cascades ecoregion to its dry eastern border, where it meets sagebrush desert landscapes.

Northern Basin and Range
The Northern Basin and Range ecoregion covers the very large southeastern portion of the state, from Burns south to the Nevada border and from the Christmas Valley east to Idaho. It is largely a high elevation desert-like area dominated by sagebrush communities and habitats.

Nearshore
The Nearshore ecoregion includes a variety of habitats ranging from submerged high-relief rocky reefs to broad expanses of intertidal mudflats in estuaries and hosts a vast array of fish, invertebrates, marine mammals, birds, plants, and micro-organisms. This ecoregion encompasses the area from the outer boundary of Oregon’s Territorial Sea to the supra-tidal zone, and up into the estuaries.
Special needs
Caspian Terns prefer unvegetated nesting islands free of mammalian predators.
Limiting factors
Long-term availability of suitable nesting sites is important to this species. As a colonial-nester, Caspian Terns are especially vulnerable to random, human-induced, or natural events that affect colonies and productivity.
Data gaps
Quantify predation levels on various runs of salmonids and on fish species of concern in interior Oregon.
Conservation actions
Protect breeding colonies from human disturbance. The U.S. Fish and Wildlife Service's Status Assessment and Conservation Recommendations (Shuford and Craig 2002) provides additional information on appropriate conservation actions for this species.