Question

Fill in blank and for each provides an explanation using examples of how it's related to ecological processes or species interactions. sentences must add something new that is related or contrasts with the statement provided.

a. A _____________ curve summarizes the pattern of survival in the population. Patterns of survival can be determined by producing a ________ life table using data of individuals of similar age, or by producing a static life table, using the information of the mortality of a number of individuals of different ages.

b. After a bird survey of the forest along North Creek a group of students reported the following species and their abundances: 5 American Crows, 35 Dark-eyed Junco, 8 Song Sparrows, 3 Anna’s hummingbirds, 2 Spotted Towhees and 1 Wilson Snipe. The species richness representing this community is _______ with a ____ evenness.

c. Many harmless species appear to mimic noxious ones. For instance, non-poisonous king snakes resemble poisonous coral snakes, and syrphid flies look like the more aggressive wasps. This evolutionary adaptation is specifically called __________________.

Answer 1

a) Survivorship curve, Cohort life table

1,000 Number of survivors (log scale) 50 100 Percentage of maximum life span

There are 3 types of survivorship curves:

1. TYPE 1: High survivorship of young and midddle aged with low survivorship of old aged. Eg, Humans

2. TYPE 2: Same survivorship rate throughout life. Eg birds

3.TYPE 3: Low survivorship of young and midddle aged with high survivorship of old aged. Eg molluscs

b) High richness, low evenness

c) Bateson mimicry: a form of mimicry where a harmless species has evolved to imitate the warning signals of a harmful species