What adaptations do otters have to survive?

The playful North American river otter is well adapted for semi-aquatic living. The mammals have thick, protective fur to help them keep warm while swimming in cold waters. They have short legs, webbed feet for faster swimming, and a long, narrow body and flattened head for streamlined movement in the water.

What causes water clarity?

Suspended sediments, algal growth, runoff, shoreline erosion, wind mixing of the lake bottom, and tannic and humic acids from wetlands can all affect water clarity.

What determines water quality?

Background. Scientists measure a variety of properties to determine water quality. These include temperature, acidity (pH), dissolved solids (specific conductance), particulate matter (turbidity), dissolved oxygen, hardness and suspended sediment.

What do urchins use to filter water into their water vascular system?

The ring canal and tubed feet are part of the madreporite which is an opening used to filter water into the water vascular system. The stone canal is a tube that connects the madreporite to the ring canal. In addition, the Purple Sea Urchin has 5 pairs of external gills around its mouth.

What is the difference between total solids and total dissolved solids?

The particles that are large enough to be held back by the filter are called total suspended solids (TSS), while the particles that pass through the filter are called total dissolved solids (TDS).

What is the difference between total solids and total suspended solids?

Total Dissolved Solids (TDS) describes to the solid particles that can pass through a 2-micron filter. The solids in a liquid that cannot pass through this filter, i.e. the larger particles, are described as suspended solids.

What is the most important abiotic measurement of water quality for sea urchins?

Salinity is an important factor for sea urchins [55], although the maximum salinity in summer had low importance in the sea urchin model at the spatial scale at which this information was available (800 m).

What is the relationship between c02 and 02 for kelp?

Despite their short lives by plant standards, kelps siphon huge amounts of carbon from the atmosphere—what scientists call “primary productivity.” They take carbon dioxide from the air and turn it into sugar fuel with the help of sunlight and water, releasing oxygen back into the air.

What is the relationship between carbon dioxide and sea urchins?

(Phys.org) —Increasing levels of carbon dioxide (CO2) in the atmosphere are causing oceans to become more acidic. This situation poses a threat to marine organisms with shells made of calcium carbonate, because acid will corrode these shells.

What is the relationship between clarity and otter survival?

What is the relationship between water clarity and otter survival? __Clearer water is better for otters because since they eat urchins, the clearer water helps them find food easier.

What is the relationship between crabs and sea urchins?

Carrier crabs have a mutualistic relationship with several species of sea urchins, which means that the interaction benefits both animals. The crabs gain protection from predators. While the crab moves along, it may use the sea urchin as shield.

What is the relationship between productivity and biodiversity?

On average, a 10% loss in biodiversity leads to a 3% loss in productivity. This means that the economic value of maintaining biodiversity for the sake of global forest productivity is more than fivefold greater than global conservation costs.

What is the relationship between productivity and biomass?

In ecology, productivity is the rate at which energy is added to the bodies of organisms in the form of biomass. Biomass is simply the amount of matter that’s stored in the bodies of a group of organisms.

What is the relationship between sea urchins and coral?

Sea urchins are commonly found in coral reef ecosystems, especially Diadema setosum species because the abundance of species populations is important for coral reefs as a counterweight. It is said to be a balancer of coral reefs due to the sea urchins themselves which generally eat algae found on coral reefs [50].

What is the relationship between the carrying capacity and productivity of an ecosystem?

Commonly, “the concept of carrying capacity is the asymptotic population biomass supported by an ecosystem under the limitations of food, shelter, etc., and the effects of predation and exploitation” (Kashiwai, 1995, p. 81). It is synonymous with the general productivity, or ‘productive capacity’, of an ecosystem.

What is the relationship between water clarity and other survival?

Just like plants on land, aquatic plants need sunlight for growth. In lakes, the amount of sunlight that reaches underwater plants depends on the clearness of the water, or water clarity. Water clarity is very important in aquatic habitats. We all know that plants will die if they cannot get enough sunlight.

What is the relationship between water temperature and orca survival?

Killer whales live in any ocean between 0 degrees Celsius and tropical water temperature. The depth of the ocean doesn’t affect them—they have even been known to enter rivers. Killer whales travel in pods, which normally consist of a mother and her offspring.

What is the relationship of sea urchin and corals?

Urchins contribute to reef resilience by grazing algae and providing settlement space for corals, thereby helping to maintain conditions necessary for coral communities to recover after acute disturbances (such as storms or bleaching events).

Why are urchins important in kelp forests?

They help to clean up any kelp that has fallen to the sea floor. However, sea urchins also love to eat the holdfasts of kelp. Since sea otters feed on sea urchins, they help to keep the sea urchin populations in balance and in return help to maintain a healthy kelp forest ecosystem.

Why do kelp forests have high productivity?

Kelp forests are extensive underwater habitats that range along 25% of the world’s coastlines, providing valuable resources, habitat, and services for coastal communities. They grow best in cold, nutrient-rich water, where they attain some of the highest rates of primary production of any natural ecosystem.

Why do otters live in water?

Otters can stay on the land. Yet, all species spend a significant part of their lives inside the water, as their main food source comes from the aquatic world. Freshwater otters will go offshore to maintain their fur, rest, or sleep.

Why does kelp live in the ocean?

Kelp are large brown algae that live in cool, relatively shallow waters close to the shore. They grow in dense groupings much like a forest on land. These underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

Why is water important for aquatic life?

Water also contains dissolved oxygen and other gases from the air, dissolved minerals from the Earth and organic matter. Gases, minerals and organic matter supply essential elements and nutrients needed by aquatic organisms to live and grow under water.

When do sea urchins spawn?

The sea urchin, Hemicentrotus pulcherrimus, spawns during winter and spring in Kagoshima, Aomori and Kanagawa.

Are there male and female kinas?

There are both male and female kina. They reach maturity at around 30 to 50 mm in diameter. They have an annual reproductive cycle, and spawn once a year, usually in the spring and summer months, depending on location. … The eggs are small and are fertilized in the water by sperm from an adjacent male.

Can you catch sea urchins in oahu?

Urchins: limit of five per species per day. He’e: limit of two per day; may be taken only by hand harvest or with a stick no more than two feet in length.

Can you fish at night in hawaii?

Some people go deep sea fishing at night in Hawaii for the unique atmosphere night fishing lends. It feels like civilization disappears out there. It’s just you and the ocean. There’s something primal about it.