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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

A female Seychelles warbler (Acrocephalussechellensis) typically produces just one egg per nesting event. A male of this species will guard his mate from the attentions of neighboring males until she lays that egg, thereby increasing the likelihood that he fathered the offspring inside it. Jan Komdeur of the University of Groningen, The Netherlands, studied the behavior of male Seychelles warblers—before females had laid eggs—in relation to the number of other males that lived nearby. First, Komdeur watched focal males (that is, the ones being studied) for 30-second time periods and recorded the percentage of time periods in which they fed or guarded mates. Then, for focal males with more than three male neighbors, Komdeur experimentally reduced the number of neighbors to three and surveyed the behavior of the focal males again to see if it changed. His results are illustratedin the graphs reproduced below. (Because males sometimes performed both behaviors during the same observation period, some observation periods counted toward both behaviors; thus, the percentages of time periods spent foraging or mate guarding sum to more than 100%.) Ifa male warbler has many male neighbors, what cost is associated with ensuring his paternity of his mate’s egg?

Chapter 56, Problem 1ITD, A female Seychelles warbler (Acrocephalussechellensis) typically produces just one egg per nesting

Source: Adapted from J. Komdeur. 2001. Mate guarding the Seychelles warbler is energetically costly and adjusted to paternity risk. Proceedings of the Royal Society of London B 268:2103–2111.

Summary Introduction

To review:

The cost that is associated with the male warbler to ensure paternity of the egg laid by his mate if there are many male neighbors.

Introduction:

The ecosystem has several numbers of species present around. These species mate with each other in order to produce their offspring. Many species have to fight for survival among different groups.

Explanation

The graph below shows the variation in foraging and male guarding. The red lines show the foraging and blue lines shows the male guard:

Foraging refers to the search for food by different species. The first graph shows the presence of male neighbors around egg, which makes the male protect its egg in order to pass on its genes to the progeny...

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