The ochre sea star, scientifically known as Pisaster ochraceus, is a marine invertebrate belonging to the class Asteroidea. It is commonly found along the Pacific coast of North America, from Alaska to Baja California. With its vibrant and striking appearance, this sea star has become one of the most iconic and recognizable organisms in its habitat.
The ochre sea star features a flat, spiny body comprised of five arms that radiate from a central disc. Its coloration can vary, ranging from orange to purple or even a deep red hue. These colors are primarily due to the presence of pigments within its tissues. The ochre sea star can grow up to 25 centimeters in diameter, making it one of the largest sea stars in its range.
This species is found in intertidal zones, where it can endure exposure to both air and water during tidal fluctuations. It feeds on a diverse diet, primarily consisting of mussels, snails, barnacles, and other invertebrates. Using its tube feet and a specialized structure called a cardiac stomach, the ochre sea star is able to pry open the shells of its prey and consume them.
The ochre sea star plays a crucial role in maintaining the ecological balance of its coastal ecosystem. As a top predator, it helps control the populations of its prey species, preventing them from overwhelming their surroundings. Furthermore, it serves as a vital link in nutrient cycling by consuming and decomposing organic matter.
Overall, the ochre sea star stands as a significant component of the coastal marine community, showcasing both its remarkable appearance and ecological importance.
