For a species with 1000 individuals at age 0 and 300 surviving at age 1, lx at age 1 is:
“0.3” for for a species with 1000 individuals at age 0 and 300 surviving at age 1, lx at age 1 is. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Survivorship curves summarize age-specific mortality: Type I concentrates loss late in life, Type II approximates a constant hazard, and Type III concentrates loss early. They are empirical patterns, not rigid taxonomic rules. The remaining alternatives—“0.1”, “0.5”, “0.8”—refer to different states, processes, or scales and therefore do not express the
Ref: Ecology: Concepts and Applications, Molles, 9th Ed., Ch. 10