These organisms specifically inhabit the area or zone between high and low tide along rocky coasts, sandy beaches or tidal wetlands/marshes. The intertidal zone is defined as the area between the high tidal mark and the low tidal mark. The intertidal zone is home to an abundance of aquatic organisms, like the barnacle, that can survive periods where they are not underwater. The lower intertidal zone is usually submerged, only being exposed at very low tides. What type of tide would most likely decrease the abundance of aquatic organisms, and why? The intertidal zone is the habitat to numerous types of small organisms such as sea urchins, starfish, and many species of coral. In the lower littoral zone, which remains submerged the majority of the time, the organisms which inhabit this zone are generally larger, and protected from predation from the crashing waves. (3 points) They also have an “operculum” or Some examples of these organisms include: hermit crabs, mussels, sea stars, types of algae, mollusks and many others. Intertidal organisms & adaptations • Snails • Mussels • Limpets & Chitons • Crabs • Anemones • Echinoderms & Echinoids III. Intertidal organisms are no different. Along the coast of California, the intertidal zone spans a height of about 2.7 meters (9 feet), which is the extent between the … The distribution of organisms in particular zones is consistent with the influence of abiotic and biotic factors. Animals living in the intertidal zone must be able to tolerate wide salinity variations. For those remarkable organisms that call the intertidal zone home, this is similar to what they experience on a daily basis. Arthropod (joint legged animals) Acorn barnacles (Balanus glandula) Acorn barnacles are some of the most common in the Pacific Northwest. Organisms living within the intertidal must be hardy and adaptable to tolerate conditions underwater as well as exposure to air. This activity will require students to document the phenomenon of vertical zonation by setting up a transect line from high to low levels and comparing abundances of species along the transect. Animals are also exposed to predators while the tide is out. The organisms that inhabit this zone must be well adapted to withstand exposure to air. The upper intertidal zone has the least amount of time submerged in water. This region is also called the seashore and foreshore, and sometimes the littoral zone. Typical organisms that inhabit this zone include lichens, green algae, brown algae, red algae, L. littorea's, and cyanobacteria. Organisms inhabiting this zone are less tolerant to extreme changes in temperature, salinity and cannot withstand long periods without water. The intertidal zone is the region of land below water at high tides and above water at low tides. THE INTERTIDAL ZONE AND BENTHIC ORGANISMS EPSS15 Lab #8 OUTLINE I. Intertidal zonation • Tides • Biotic zonation • Physical conditions & biotic interactions II. Several animal species reside within the intertidal zone, each divided by the zones created by the tide. As a result, it contains the greatest biodiversity within the intertidal zone. ). Intertidal Zone Animals. In most adult barnacles, the sides and back of the animal are protected by five or six calcareous plates. They are found in high and mid-intertidal zones. The peritidal zone is similar but somewhat wider, extending from above the highest tide level to below the lowest. If sufficient nutrients are available, intertidal animals reproduce rapidly, so they constantly compete for space, light, and food. The intertidal zone is also home to several species from different phyla (Porifera, Annelida, Coelenterata, Mollusca, Arthropoda, etc. Also, acorn barnacles are able to survive along this zone. Organisms in the intertidal zone are adapted to an environment of harsh extremes.