What type of population dispersion is most common, and how does area sampled affect how
dispersion appears to a researcher?
What will be an ideal response?
Clumped dispersion is extremely common in nature because suitable habitat conditions are patchy in
nature. However, the area sampled can affect how dispersion appears. Dispersion may appear random
or clumped or uniform at one spatial scale, but different at a different spatial scale. For example, a
population may appear randomly dispersed at a small scale, but over the entire extent of the population
may be clumped. The larger the sampled area, the more closely the actual dispersion pattern will be
revealed, although dispersion at all spatial scales is ecologically relevant.
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Answer the following statements true (T) or false (F)
1. Cephalopods have a ring structure in their skin that secretes mucus to bind mating individuals and forms a protective cocoon for their eggs. 2. Echinoderms have centralized nervous control at the center of their bodies. 3. Monotremes are classified as reptiles because they lay leathery eggs. 4. Male monotremes and eutherians possess mammary glands. 5. Mastication is a kind of physical digestion.
Biochemicals, known as __________, are produced by glands, travel through the bloodstream, and alter the metabolism of specific target cells.
A. enzymes B. pheromones C. neurotransmitters D. hormones E. pectines
Which of the following statements about lipids is incorrect?
A) They are short chains of polar hydrocarbons. B) They are used for energy storage. C) They are large chains of nonpolar hydrocarbons. D) They are primary component of cell membranes. E) They are hydrophobic and water insoluble.
A genetic disease that causes death in infancy and has an autosomal recessive inheritance pattern can persist in a population because: Check all that apply.
A. If both parents are carriers, they have a 50% chance of having normal children. B. Individuals with one abnormal allele do not show symptoms of the disease. C. Only homozygotes for the abnormal allele will have the disease. D. It can be passed on to the next generation by a heterozygous carrier.