Marine Iguanas: Survival and Body Size Labaids

What does the graph in Figure 1.8 show about the survival rate of marine iguanas on Genovesa Island compared to Santa Fe Island?

• Higher on Genovesa

• Higher on Santa Fe

• Same on both islands

• No data available

Larger marine iguanas can feed more efficiently than smaller iguanas because they can get the food they need with less ____.

• Time

• Effort

• Food

• Water

What is the feeding rate of a small iguana compared to a large iguana?

• 1 food unit per hour for small, 2 for large

• 2 food units per hour for small, 1 for large

• 3 food units per hour for small, 1 for large

• 1 food unit per hour for both

During an El Niño year, the winds reverse direction, preventing the upwelling of cold, nutrient-rich water. This results in a die-off of ____.

• fish

• algae

• birds

• mammals

What does the graph from March 1991 show about the body-length measurements of iguanas on Genovesa Island?

• Most iguanas were between 100-130 mm.

• Most iguanas were between 170-190 mm.

• Most iguanas were between 230-250 mm.

• Most iguanas were between 260-280 mm.

Fill in the blank: In November 1991, the body-length measurements of iguanas on Genovesa Island showed a peak at ___ mm.

• 100

• 150

• 180

• 250

What was the most common body length range in March 1992?

• 150-160 mm

• 170-180 mm

• 190-200 mm

• 210-220 mm

In November 1992, the highest percentage of the population had a body length of ___ mm.

• 170

• 180

• 190

• 200

What is El Niño?

• A) A type of fish

• B) A climate pattern

• C) A mountain

• D) A desert

During El Niño, the sea surface temperature is usually ______.

• Cooler

• Warmer

• The same

• Unknown