Question: What Is An R Selected Animal?

Are humans R or K strategists?

Both across and within species, r and K strategists differ in a suite of correlated characteristics.

Humans are the most K of all.

K’s supposedly have a longer gestation period, a higher birthweight, a more delayed sexual maturation, a lower sex drive, and a longer life..

Why are dandelions r-selected species?

Lesson Summary The R in R-selected represents population growth rate. Dandelions are particularly good examples of R-selected traits because they have several of the physical characteristics associated with R-selected traits including: rapid development, small size, and short lifespan.

What are R-selected and K-selected species?

r-selected babies grow rapidly, and tend to be found in less competitive, low quality environments. … K-selected species produce offspring that each have a higher probability of survival to maturity.

Why are rabbits R-selected?

So this begs the question are rabbits truly prolific, and why? In Page 2 the 1960s two ecologists came up with r/K selection theory. It relates to parental investment and reproductive strategies adopted by species in order to advance its kind into the future. … And they have the ability to reproduce rapidly.

Are Snakes r-selected species?

Despite having characteristics of both R and K strategists, Eastern Milk Snakes are R strategists. Mainly because of the fact that they do not care for their young, but also because the baby snakes mature fairly quickly.

Are Lions R or K-selected?

Common examples of k-strategists species include humans, lions and whales.

Are bacteria R selected?

R-selected organisms, those emphasizing a fast growth rate, high number of offspring, include rabbits, bacteria, salmon, plants such as weeds and grasses, etc.

Are trees R or K-selected?

For instance, trees have traits such as longevity and strong competitiveness that characterise them as K-strategists. In reproduction, however, trees typically produce thousands of offspring and disperse them widely, traits characteristic of r-strategists.

What are the characteristics of R selected species?

The production of numerous small offspring followed by exponential population growth is the defining characteristic of r-selected species. They require short gestation periods, mature quickly (and thus require little or no parental care), and possess short life spans.

Are cats R strategists?

r selected species are also known as r strategists and opportunistic species. They practice big-bang reproduction, AKA semelparity. … Cats are r-selected compared to humans, and K-selected compared to cockroaches.

Are cats R-selected or K-selected?

Cats and dogs are r-selected compared to humans, but K-selected compared to mice and rats. … We can think of an r-K selection continuum and an organism’s position along it in a particular environment at a given instant in time (Pianka 1970).

What are examples of R-selected species?

Typical examples of r-species are mice, rabbits, weeds and bacteria, which have a lot of offspring, but a short life expectancy. Examples of organisms undergoing K-selection are tortoises, elephants, people, and sequoia trees: their offspring are few but long-lived.

Are humans Semelparous or Iteroparous?

The term iteroparity comes from the Latin itero, to repeat, and pario, to beget. An example of an iteroparous organism is a human—humans are biologically capable of having offspring many times over the course of their lives. Iteroparous vertebrates include all birds, most reptiles, virtually all mammals, and most fish.

Are cockroaches r selected species?

R-selected species are things like the cockroach. They’re generally small and have short lives, so their best bet is to put their energy into growth. They grow quickly and produce as many offspring as possible to carry on genetic information.

Are humans r-selected species?

These species are characterized by having only a few offspring but investing high amounts of parental care. Elephants, humans, and bison are all k-selected species. … R-selected species can include mosquitos, mice, and bacteria.

Are jellyfish R-selected?

r-selected species Animals that are r-selected do not give long-term parental care and the offspring are relatively mature and self-sufficient at birth. Examples of r-selected species are marine invertebrates, such as jellyfish, and plants, such as the dandelion.