Habitats 101
Discover the Diverse Habitats of the San Lorenzo Valley
Our objective is to provide a crash course on ecosystem and habitat dynamics. We’ll introduce the concept of native habitats, the diversity of habitats, and how animals depend on certain conditions in various settings. We’ll look at well-known locations in the San Lorenzo Valley, displaying the region’s rich tapestry of diverse habitats.
What is a habitat? Is it a bird’s nest or a tidepool? How about a wide, grassy meadow or a clear, blue lake? Everything listed can, in fact, be considered a habitat!
For our sake, we can simplify “habitat” to the region where certain microorganisms, animals, and plants live and the environmental factors that help them survive there.
Now equipped with our “habitat” definition, let’s view our communities through this lens. Houses, businesses, and roads take up land that was previously living space for plants and animals. With increasing human populations and economic growth, the areas that can support native plants and animals are shrinking. This is commonly referred to as “habitat fragmentation.” Thus, we must do everything to integrate the needs of native habitats with the needs of our community in the San Lorenzo Valley.
What Are Native Habitats?
By itself, “native” means the natural place where something was born or typically occurs. So together, “native habitats” refer to regions where certain animals and plants naturally occur in the environment. These areas possess the exact type of food and living spaces that allow organisms to survive successfully.
Let’s take it a step further. Some flora and fauna have particular habitat requirements to thrive in a given area. These organisms are generally dubbed “habitat specialists,” while organisms that can thrive in a wide range of conditions are called “habitat generalists.” Some of the most visible animals in the SLV, such as coyotes and raccoons, are considered habitat generalists due to their skill of adapting to residential and urban landscapes. One notable habitat specialist in the SLV is the Mount Hermon June Beetle. Only found in Sandhills habitats, these beetles thrive on a specific type of soil. The Mount Hermon June beetle is endangered and exists nowhere else on the planet because of these particular living conditions!
Habitat specialists face acute challenges when climate change and habitat fragmentation disturb the unique conditions that support their survival. That’s one of the many reasons scientists and land managers are concerned with protecting a diverse range of natural spaces in the SLV.
Different Types of Habitats:
California’s San Lorenzo Valley hosts a range of diverse native habitats. Here are some of the prominent types found in the region:
Redwood Forests
Coast redwoods are the tallest trees in the world and do not often need an introduction. These iconic, ancient trees thrive along the Pacific Coast in regions with ample fog and cooler temperatures. Beneath their shade-intensive canopies, redwood forests support fungi and herbaceous plants. One easy way to distinguish a redwood from other conifers is by looking for reddish, fibrous bark. The SLV has numerous stretches of redwoods on public and private land, with some of the most popular spots in Henry Cowell and Big Basin State Parks.
Riparian Zones
What’s a riparian, a type of dinosaur? Not quite! Riparian comes from the word riparius, which means “river,” and the Latin root ripa, meaning “bank” or “shore.”
Riparian habitats are areas along rivers, streams, and other water bodies. Due to periodic flooding, riparian soils and vegetation are adapted to moist conditions. A range of migratory birds, amphibians, and fish inhabit this dynamic habitat. SLV boasts miles of riparian habitat along the San Lorenzo River and various networks of streams and creeks throughout the Valley. While providing habitat for different plants and animals, riparian habitats also purify water before it flows to the ocean.
Sandhills
What’s at the bottom of an ancient ocean? A quick drive through the mountains could answer that question!
The Sandhills contain sand from over 15 million years ago when the ocean covered the SLV. This habitat is characterized by coarse, sandy soils that still contain marine fossils. Many SLV residents reminisce about hunting for shiny bits of shark teeth as children.
This habitat hosts plant and animal species found nowhere else in the world. That’s because the sandy soil conditions can only support specific species adapted to low water and nutrient conditions. Shrubby chaparral and tall Ponderosa pines comprise most of the area’s tree species. Quail Hollow County Park boasts pockets of this habitat, and you will see stretches of sandhills along Mt Hermon from Felton to Scotts Valley. Additionally, Henry Cowell State Park has a few trails winding through this rare habitat, where you can try to spot a rare Mount Hermon June Beetle or a Zayante Band-Winged grasshopper!
Oaks
Like redwood forests, oak woodlands are iconic facets of California’s landscape. Oak woodlands are vast stretches of land hosting a variety of oak trees. North America contains an impressive 90 unique oak tree species, but the most common in the SLV are the coast live oak, California black oak, and the canyon live oak. This habitat is characterized by dry conditions in the warmer months, followed by wet conditions during the winter.
Like redwood forests, oak woodlands are iconic facets of California’s landscape. Throughout the SLV, stands (a group of the same tree species) of oaks exist in small patches among mixed-evergreen forests. Hotter areas in California, especially with a Mediterranean climate, can sustain larger swathes of oak woodland forests. While the SLV may not have an abundance of oaks, the importance of these trees is immeasurable.
Meadows and Grasslands
Meadows and grasslands are open, expansive areas with annual grasses and flowering herbaceous plants. Few trees exist within grasslands due to various biophysical factors and competition from other species. Plant species in these regions adapted to fire disturbances over time due to land management practices from indigenous populations. Today, land management officials periodically burn Big Basin and Henry Cowell State Park grasslands to simulate historical fire disturbance.
Mixed-Evergreen Forests
Plant and animal species often exist outside of strict habitat boundaries. For example, the SLV contains long stretches of mixed-evergreen forest, where many species coexist and interact. Specifically, mixed-evergreen forests are forests made up of several species of coniferous (evergreen) trees. These include tanoak, California bay laurel, various oaks, and Douglas furs. Mixed-evergreen forests are often interwoven along stands of redwoods and other old-growth trees. The variety of plants from mixed-evergreen forests attracts a wide range of habitat generalists.
Transition Zones: The Inbetweeners
Transition zones, often called “ecotones” in academic literature, exist on the edges of habitat boundaries. These areas describe the transition from one habitat type to another. While frequently overlooked by conservation scientists, ecotones represent necessary homes for habitat generalists who require resources from multiple areas. Ecotones display that even the fringes of core habitats serve valuable functions for SLV flora and fauna.
A Fragile Balance: Ecosystems and Us
In the natural world, nothing exists alone. Ecosystems are overlaid with plants, animals, and microorganisms that influence each other throughout their life histories. Whether it’s competing for resources, hunting and/or being hunted, or just coexisting in the same region, flora and fauna are constantly interacting with one another. Native habitats throughout the SLV are overlaid with these interactions, yielding a dynamic and vibrant mosaic of living and nonliving components.
Unfortunately, it’s easy to upend this delicate balance once human development intrudes on habitats and ecosystem interactions. Today, it’s almost impossible for the natural world to exist separately from human influence, as roads, telephone lines, and clusters of houses intersect forests and open spaces.
The SLV isn’t immune to this issue. Our community lives closely alongside towering redwoods and riparian zones, but buildings and streets fragment the available habitat we discussed above. It’s difficult to balance the needs of the community, like homes and infrastructure, with the needs of native flora and fauna. Our goal for the Native Habitat Restoration Program is to restore native habitats while involving the community, and that starts with spreading relevant scientific information.