type iii or concave curves describes populations whose mortality is highest at young ages.
type iii or concave curves describes populations whose mortality is highest at young ages.
which type of survivorship curve describes populations whose mortality is highest at young ages?
type iii or concave curves
bullet::::- "type iii" or concave curves have the greatest mortality (lowest age-specific survival) early in life, with relatively low rates of death (high probability of survival) for those surviving this bottleneck. this type of curve is characteristic of species that produce a large number of offspring (see r/k selection theory). this includes most marine invertebrates. for example, oysters produce millions of eggs, but most larvae die from predation or other causes; those that survive long enough to produce a hard shell live relatively long.
survivorship curve
there are various reasons that a species exhibits their particular survivorship curve, but one contributor can be environmental factors that decrease survival. for example, an outside element that is nondiscriminatory in the ages that it affects (of a particular species) is likely to yield a type ii survivorship curve, in which the young and old are equally likely to be affected. on the other hand, an outside element that preferentially reduces the survival of young individuals is likely to yield a type iii curve. finally, if an outside element only reduces the survival of organisms later in life, this is likely to yield a type i curve.
survivorship curve