Survivorship: Who will Survive?

Population dynamics is a key component to understanding species interaction. Populations are in constant interaction with other populations as well as their environment. A species ability to adapt to these interactions through the evolutionary process usually holds the key to the species survival.
Over million of years of evolution, organisms have adapted to their environment, in order to keep their populations and their species alive. One way to study population trends, is with the use of survivorship curves. Survivorship curves represent two population trends: age-specific mortality and how organisms have evolved to effectively reproduce. By studying these patterns, we can observe at what age organisms are most vulnerable. We can also assume their reproductive patterns.
In general, every species fits into a particular curve. Type 1 curve (which is common to humans and large mammals) is characterized by high survivorship and low-mortality at a young age. These type organisms have few offspring but they have a good chance of surviving to reproductive age. Curve 3 is characterized by low survivorship and high-mortality rate at a young age. This requires organisms of this class (crustaceans, plants) to have many offspring.
Studying patterns like these is key to understanding species interaction because they exemplify the evolutionary nature of reproductive methods.

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[zulkarnaen06]

i have 2 question about survivorship curve

1) survivorship curve describes the relationship between (log lx vs x) or (lx vs x)?

2) why if i plot (log lx vs x) and (lx vs x), both have the same form?

[chobitfan48]

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[SamuelHammer]

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