Terrestrial habitat

Terrestrial habitat in Puget Sound varies greatly, from alpine and subalpine meadows and evergreen forests to valleys, floodplains, and prairie. However, these ecosystems are not clearly divided but blend smoothly into each other, linked by rivers and streams and the overlapping ranges of various species, determined by their tolerance of various environmental conditions. Various approaches exist for categorizing habitat types. Franklin and Dyrness developed a system in 1973 using dominant tree species as distinguishing features. In the Northwest, Sitka spruce dominates the lower elevations, moving towards Western hemlock and Douglas fir farther from sea level. Silver fir is more prevalent in the middle range, and mountain hemlock at higher elevations. Jones (1936) established the four Merriam’s Life Zones: Humid Transition, Canadian, Hudson, and Arctic-Alpine, which are defined by vegetation patterns, precipitation, and elevation.

Sources:

Kruckeberg, Arthur. A Natural History of Puget Sound Country.1991. University of Washington Press, Seattle, WA.

Overview

Freshwater habitat in the Puget Sound region consists of rivers, marshes, streams, lakes and ponds that do not have any saltwater input. Many species depend on these freshwater resources, including salmon, salamanders, frogs, and beavers.

Freshwater habitat in King County. Photo by Jeff Rice. All rights reserved.

Related Articles

The Puget Sound region is known for its salmon-filled estuaries and coastal forests, but on the southern portion of its range, evergreens give way to small patches of rolling grasslands that are home to some of Washington's rarest species. One of those species, the northwestern pond turtle, was recently proposed for listing under the Endangered Species Act. A captive breeding program is preparing these turtles for the challenges of life in the wild.

A 2023 report from the University of Washington Puget Sound Institute synthesizes past Watershed Lead Organization Program grants to support the EPA-funded Land Development and Cover and Floodplains and Estuaries Implementation Strategies. The report offers lessons learned from the habitat restoration and land acquisition-focused grants.

Can restoring the natural balance of the Nooksack River also reduce flood risks? Officials on both sides of the U.S.-Canada border are taking note as climate change raises the stakes. 

The 2021 State of the Sound is the Puget Sound Partnership’s seventh biennial report to the Legislature on progress toward the recovery of Puget Sound. The document reports on both the status of the Partnership's recovery efforts and a suite of ecosystem indicators referred to as the Puget Sound Vital Signs.

Raging wildfires can be an ecological disaster, especially as the planet warms due to climate change. But in small doses, some wildfires are actually beneficial. In prairie habitats, fires can enrich soils and maintain native plant species. In late September, state wildlife biologists oversaw several controlled burns near Joint Base Lewis-McChord (JBLM) as part of an effort to preserve habitat for the endangered Taylor's checkerspot butterfly. Less than 3% of Puget Sound's prairies now remain and are mostly concentrated along the region's southern edges, including land on the military base. Listen to a recording of some of the action, including comments from JBLM fire manager and biologist John Richardson.

A Lopez Island-based nonprofit says the protection of critical habitat for native plants can also preserve a wealth of traditional knowledge. The group is working with private landowners to raise awareness of culturally important plants hidden in the bogs and underbrush of Puget Sound's natural areas.