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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

The graph in the Figure plots relative olfactory bulb size for pairs of closely related birds (a through m), with each pair having a species that is more active at night (nocturnal) and one that is more active during the day (diurnal). The researchers hypothesized that nocturnal birds would have larger olfactory bulbs because they need to depend on senses other than sight.

From these data, which, if any, of the bird pairs supports the hypothesis of the researchers?

Explain each of your answers.

Chapter 41, Problem 1ITD, The graph in the Figure plots relative olfactory bulb size for pairs of closely related birds (a

Source: From S. Healy and T. Guilford. 1990. Olfactory-bulb size and nocturnality in birds. Evolution 44:339–346. Copyright © 1990 Wiley Publishing.

Summary Introduction

To review:

The identification of bird pairs, if any, that could support the hypothesis of researchers based on the given graph.

Introduction:

Olfactory receptors are present in the nose of vertebrates and help in detection of chemicals that are present in the environment. The odor receptors help the organisms to identify food, mate, and adverse conditions. Birds like chickens, prefer bedding that contains their own odor. Other birds prefer certain types of food according to their odors. Nocturnal birds are those that are active during night and diurnal birds are those that are active during day.

Explanation

The following graph represents the size of olfactory bulb in different pairs of birds. The pairs consist of diurnal and nocturnal birds, that are represented by blue and red dots, respectively.

The olfactory bulb is a part of brain where the olfactory neurons form synapses and send signals to the cerebral cortex. Researchers have speculated that the olfactory bulbs of diurnal birds are small as compared to nocturnal birds...

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