Our editors will review what youve submitted and determine whether to revise the article. These traits indicate r-selection. Copyright Science Struck & Buzzle.com, Inc. These factors influence the survival of individuals in a population. Our website uses cookies to improve your experience. Mortality is low for a long period of time after birth. Note that survivorship curves must be plotted on a log scale to compare with idealized Type I, II, and III curves; they will look different on a linear scale. I would definitely recommend Study.com to my colleagues. The Type I curve, illustrated by the large mammals, tracks organisms that tend to live long lives (low death rate and high survivorship rate); toward the end of their life expectancies, however, there is a dramatic increase in the death rate. R-Selected Species | Definition, Characteristics & Examples, Interspecific Competition, Competitive Exclusion & Niche Differentiation | Overview & Examples, Dispersal in Ecology |Types, Benefits & Costs, What are Density-Dependent Factors? Survivorship curves and K-/r-selection (article) | Khan Academy K-selected species have traits that are advantageous at high population densities. Biogeographic Factors Affecting Community Diversity, Fundamental vs. The only parental care provided by the female in this case, is the nourishment contained within the egg when it is laid. In this type of survivorship, the rate of survival of individuals is high at an early and middle age and goes on decreasing as the individual progresses into old age. This curve shows that death is a constant regardless of age. As can be seen from the mortality rate data (column D), a high death rate occurred when the sheep were between six months and a year old, and then increased even more from 8 to 12 years old, after which there were few survivors. Recall the trade-off related to offspring size and number. 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