APES Unit 3: K-selected r-Selected Species

Cycads are gymnosperms that were diverse and abundant during the Mesozoic era. Extant species of cycads share many traits with those from the Mesozoic era. Cycads bear cones, are long-lived with slow growth rates, show late reproductive maturity, and have very few offspring. Based on this description, the cycads are

Responses

A) K-strategists with a Type I survivorship curve.

B) r-strategists with a Type III survivorship curve.

C) K-strategists with a Type III survivorship curve.

D) r-strategists with a Type II survivorship curve.

A) K-strategists with a Type I survivorship curve.

Scientists determined that a species of a reptile dinosaur cohort had 20% survivorship during the first two years of life, but then the survivorship of those individuals that survived to age 2 had a 70% survivorship to middle age. Survivorship declined later in life. Which of the following best illustrates the shape of the survivorship curve for this species?

C

A certain species of dinosaur laid large numbers of eggs, and the hatchlings had high mortality early in life. But if they survived, the young dinosaurs were able to grow at a rapid pace and disperse into the environment in order to thrive. Based on this information and the graph above, which of the following best characterizes this species of dinosaur?

A) The dinosaurs were r-strategists and exhibited a Type I survivorship curve.

B) The dinosaurs were r-strategists and exhibited a Type III survivorship curve

C) The dinosaurs were K-strategists and exhibited a Type II survivorship curve.

D) The dinosaurs were K-strategists and exhibited a Type I survivorship curve.

B) The dinosaurs were r-strategists and exhibited a Type III survivorship curve

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