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Martin Wikelski and L

question 19

Multiple Choice

Martin Wikelski and L. Michael Romero (Body size, performance and fitness in Galápagos marine iguanas, Integrative and Comparative Biology 43 [2003]:376-86) measured the snout-to-vent (anus) length of Galápagos marine iguanas and observed the percent survival of different-sized animals, all of the same age. The graph shows the log snout-vent length (SVL, a measure of overall body size) plotted against the percent survival of these different size classes for males and females.
-Currently the only predators of Galápagos marine iguanas are Galápagos hawks. Iguana body size is not correlated with risk of hawk predation, although small iguanas can sprint faster than large iguanas. If predators (for example, cats) that preferably catch and eat slower iguanas are introduced to the island, iguana body size is likely to ________ in the absence of other factors; the iguanas would then be under ________ selection.

Definitions:

Part-Time Work

Employment with fewer hours per week than a full-time job, often without the same benefits as full-time employment.

Necessities

Basic needs that are essential for human survival and well-being, including food, water, shelter, and clothing.

Interlocking Directorates

The practice of sharing board members among different companies, which can lead to a concentration of power and influence.

Board of Directors

A group of elected or appointed members who jointly oversee the activities and governance of a company or organization.