What was the primary reason the southern sea otter nearly went extinct by the early 1900s?
Because they have thick, luxurious fur
.
Which of the following has caused the population of the southern sea otters to decline?
Southern sea otters (Enhydra lutris nereis), also known as California sea otters, were listed as threatened in 1977 under the Endangered Species Act. Reduced range and population size,
vulnerability to oil spills, and oil spill risk from coastal tanker traffic
were the primary reasons for listing.
What has caused the population of southern sea otters to fluctuate?
Which of the following has caused the population of the southern sea otters to fluctuate? … As a result,
predator and prey populations exert tremendous natural selection pressures on each other
.
When populations of two different species interact over long periods of time changes in the gene pool of one species can lead to changes in the gene pool of the other this is called *?
When populations of two different species interact in this way over a such long period of time, changes in the gene pool of one species can lead to changes in the gene pool of the other species. Such changes can help both sides to become
more competitive
or can help to avoid or reduce competition.
Which of the following is said to occur when one organism feeds on another organism by living on or in the other organism?
Terms in this set (32)
parasitism
– occurs when one organism (the parasite) feeds on the other organism (the host), usually by living on or in the host.
What’s so special and unique about a sea otter’s fur?
Its fur is
the densest of any animal on Earth
—an estimated 1 million hairs per square inch. That’s because, unlike its fellow marine mammals, it has no blubber to keep it warm. … The sea otter is one of the few mammal species on Earth to use a tool to help it hunt and feed.
What happened to sea otters since 1911?
By 1911,
hunting for the animal’s luxurious fur had reduced the sea otter population to fewer than 2000 individuals in the most remote and inaccessible parts of its range
. … In two important parts of its range, however, sea otter populations have recently declined or have plateaued at depressed levels.
How many sea otters are left in the world 2020?
Sea otter population growth has stalled in recent years and many hurdles for full population recovery remain. There are only
about 3,000 southern sea otters left
in the wild today.
What will happen if sea otters go extinct?
As top predators, sea otters are critical to maintaining the balance of nearshore
ecosystems
, such as kelp forests, embayments and estuaries. Without sea otters, sea urchins can overpopulate the sea floor and devour the kelp forests that provide cover and food for many other marine animals.
What is meant by environmental resistance?
:
the sum of the environmental factors
(such as drought, mineral deficiencies, and competition) that tend to restrict the biotic potential of an organism or kind of organism and impose a limit on numerical increase.
When the process happens in a place with no life and no soil it is called?
Ecological succession happens when new life takes over an environment. …
Primary succession
occurs in essentially lifeless areas—regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier.
What is the ability of a living system to survive moderate disturbances?
One is
inertia, or persistence
: the ability of a living system, such as a grassland or a forest, to survive moderate disturbances.
How can two individuals compete without ever coming in contact with each other?
Species can compete even if they
never come into direct contact with each other. For example, suppose that one insect feeds on a certain plant during they day and that another species feeds on the same plant during the night. Because they use the same food source, the two species are indirect competitors.
What are the 5 types of interaction?
- Competition.
- Predation.
- Parasitism.
- Mutualism.
- Commensalism.
What is positive and negative interaction?
Organisms
living together in a community influence each other directly or indirectly under natural conditions
. The interaction between organisms may not be always beneficial to all the interacting counter parts. …
