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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Iguana Decline In 1987, Martin Wikelski began a long-term study of marine iguanas in the Galápagos Islands. He marked iguanas on two islands—Genovesa and Santa Fe—and collected data on how their body size, survival, and reproductive rates varied over time. He found that because iguanas eat algae and have no predators, deaths usually result from food shortages, disease, or old age. In January 2001, an oil tanker ran aground and leaked a small amount of oil into the waters near Santa Fe. FIGURE 44.3 shows the number of marked iguanas that Wikelski and his team counted in their study populations just before the spill and about a year later.

Chapter 44, Problem 3DAA, Iguana Decline In 1987, Martin Wikelski began a long-term study of marine iguanas in the Galpagos

FIGURE 44.3 Shifting numbers of marked marine iguanas on two Galápagos islands. An oil spill occurred near Santa Fe just after the January 2001 census (orange bars). A second census was carried out in December 2001 (green bars).

Wikelski concluded that changes on Santa Fe were the result of the oil spill, rather than sea temperature or other climate factors common to both islands. How would the census numbers be different from those he observed if an adverse event had affected both islands?

Summary Introduction

To predict: The difference in the census numbers of marine iguanas from the original observations made by the researcher, if an adverse event had affected both the islands.

Concept introduction: Iguanas are kind of reptiles but unique among the modern lizards. This organism feeds on algae and large species find its food source on the tidal region as they live in rocky shores. These are currently considered as threatened species over the century due to the poaching, negative effects of introduced species, loss, and fragmentation of habitat. Many NGO’s and program researchers are taken part in protecting these species by creating artificial nesting sites.

Explanation

The research group of person M conducted the long-term study of marine iguanas in Gal Islands. The study on the population of marine iguanas was done on island Gen and island SF in the year 2001. This study tells about their body size, survival, and the reproductive rate over the period of time. During this year, the oil spill occurred near the island SF leads to the loss of marine iguana species. They observed the population of marked marine iguanas on two islands over the period of a year by conducting two surveys.

Refer Fig. 44.3, “Shifting numbers of marked marine iguanas on two Galapagos islands” in the textbook...

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