Experimental Analysis of Sperm Competition Mechanisms in a Wild Bird Population
Recent work on wild birds has revealed the importance of sperm competition as a source of sexual selection, but behavioral and paternity studies have previously provided only indirect evidence for mechanisms of sperm competition in wild birds. In a field study of collared flycatchers Ficedula albico...
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| Published in | Proceedings of the National Academy of Sciences - PNAS Vol. 99; no. 8; pp. 5466 - 5470 |
|---|---|
| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
National Academy of Sciences
16.04.2002
National Acad Sciences |
| Subjects | |
| Online Access | Get full text |
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| Abstract | Recent work on wild birds has revealed the importance of sperm competition as a source of sexual selection, but behavioral and paternity studies have previously provided only indirect evidence for mechanisms of sperm competition in wild birds. In a field study of collared flycatchers Ficedula albicollis we used a previously uncharacterized method to determine the frequency and timing of extra-pair inseminations. By counting the number of sperm trapped on the perivitelline layer of eggs, we determined the timing of inseminations and estimated, on a day-to-day basis, the amount of sperm females stored. Our results showed that female collared flycatchers preferentially engaged in extra-pair copulations when mated to an unattractive male with a small white forehead patch. These copulations were timed for the middle part of their fertile period, at least 2 days after the last within-pair insemination. Although the mean number of extra-pair insemination events was only 1.33 per cuckolding female, the ratio between the number of sperm from extra-pair and pair inseminations was at least 5 to 1. Thus a single, well timed extra-pair insemination caused by female behavior could greatly bias fertilization probability in favor of an attractive extra-pair male. Our results suggest a possible behavioral mechanism for female control of sperm competition. |
|---|---|
| AbstractList | Recent work on wild birds has revealed the importance of sperm
competition as a source of sexual selection, but behavioral and
paternity studies have previously provided only indirect evidence for
mechanisms of sperm competition in wild birds. In a field study
of collared flycatchers
Ficedula albicollis
we used a
previously uncharacterized method to determine the frequency and
timing of extra-pair inseminations. By counting the number of sperm
trapped on the perivitelline layer of eggs, we determined the timing of
inseminations and estimated, on a day-to-day basis, the amount of sperm
females stored. Our results showed that female collared flycatchers
preferentially engaged in extra-pair copulations when mated to an
unattractive male with a small white forehead patch. These copulations
were timed for the middle part of their fertile period, at least 2 days
after the last within-pair insemination. Although the mean number of
extra-pair insemination events was only 1.33 per cuckolding female, the
ratio between the number of sperm from extra-pair and pair
inseminations was at least 5 to 1. Thus a single, well timed extra-pair
insemination caused by female behavior could greatly bias fertilization
probability in favor of an attractive extra-pair male. Our results
suggest a possible behavioral mechanism for female control of sperm
competition. Recent work on wild birds has revealed the importance of sperm competition as a source of sexual selection, but behavioral and paternity studies have previously provided only indirect evidence for mechanisms of sperm competition in wild birds. In a field study of collared flycatchers Ficedula albicollis we used a previously uncharacterized method to determine the frequency and timing of extra-pair inseminations. By counting the number of sperm trapped on the perivitelline layer of eggs, we determined the timing of inseminations and estimated, on a day-to-day basis, the amount of sperm females stored. Our results showed that female collared flycatchers preferentially engaged in extra-pair copulations when mated to an unattractive male with a small white forehead patch. These copulations were timed for the middle part of their fertile period, at least 2 days after the last within-pair insemination. Although the mean number of extra-pair insemination events was only 1.33 per cuckolding female, the ratio between the number of sperm from extra-pair and pair inseminations was at least 5 super( )to 1. Thus a single, well timed extra- pair insemination caused by female behavior could greatly bias fertilization probability in favor of an attractive extra-pair male. Our results suggest a possible behavioral mechanism for female control of sperm competition. Recent work on wild birds has revealed the importance of sperm competition as a source of sexual selection, but behavioral and paternity studies have previously provided only indirect evidence for mechanisms of sperm competition in wild birds. In a field study of collared flycatchers Ficedula albicollis we used a previously uncharacterized method to determine the frequency and timing of extra-pair inseminations. By counting the number of sperm trapped on the perivitelline layer of eggs, we determined the timing of inseminations and estimated, on a day-to-day basis, the amount of sperm females stored. Our results showed that female collared flycatchers preferentially engaged in extra-pair copulations when mated to an unattractive male with a small white forehead patch. These copulations were timed for the middle part of their fertile period, at least 2 days after the last within-pair insemination. Although the mean number of extra-pair insemination events was only 1.33 per cuckolding female, the ratio between the number of sperm from extra-pair and pair inseminations was at least 5 to 1. Thus a single, well timed extra-pair insemination caused by female behavior could greatly bias fertilization probability in favor of an attractive extra-pair male. Our results suggest a possible behavioral mechanism for female control of sperm competition. Recent work on wild birds has revealed the importance of sperm competition as a source of sexual selection, but behavioral and paternity studies have previously provided only indirect evidence for mechanisms of sperm competition in wild birds. In a field study of collared flycatchers Ficedula albicollis we used a previously uncharacterized method to determine the frequency and timing of extra-pair inseminations. By counting the number of sperm trapped on the perivitelline layer of eggs, we determined the timing of inseminations and estimated, on a day-to-day basis, the amount of sperm females stored. Our results showed that female collared flycatchers preferentially engaged in extra-pair copulations when mated to an unattractive male with a small white forehead patch. These copulations were timed for the middle part of their fertile period, at least 2 days after the last within-pair insemination. Although the mean number of extra-pair insemination events was only 1.33 per cuckolding female, the ratio between the number of sperm from extra-pair and pair inseminations was at least 5 to 1. Thus a single, well timed extra-pair insemination caused by female behavior could greatly bias fertilization probability in favor of an attractive extra-pair male. Our results suggest a possible behavioral mechanism for female control of sperm competition. In a field study of collared flycatchers Ficedula albicollis, the authors used a previously uncharacterized method to determine the frequency and timing of extra-pair inseminations. By counting the number of sperm trapped on the perivitelline layer of eggs, they determined the timing of inseminations and estimated, on a day-to-day basis, the amount of sperm females stored. |
| Author | Michl, Gábor Török, János Sheldon, Ben C. Griffith, Simon C. |
| AuthorAffiliation | Behavioural Ecology Group, Department of Systematic Zoology and Ecology, Eötvös University, H-1117, Pázmány P. Sétány 1/C, Budapest, Hungary; and † Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, United Kingdom |
| AuthorAffiliation_xml | – name: Behavioural Ecology Group, Department of Systematic Zoology and Ecology, Eötvös University, H-1117, Pázmány P. Sétány 1/C, Budapest, Hungary; and † Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, United Kingdom |
| Author_xml | – sequence: 1 givenname: Gábor surname: Michl fullname: Michl, Gábor – sequence: 2 givenname: János surname: Török fullname: Török, János – sequence: 3 givenname: Simon C. surname: Griffith fullname: Griffith, Simon C. – sequence: 4 givenname: Ben C. surname: Sheldon fullname: Sheldon, Ben C. |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/11943862$$D View this record in MEDLINE/PubMed |
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| Copyright | Copyright 1993-2002 National Academy of Sciences of the United States of America Copyright National Academy of Sciences Apr 16, 2002 Copyright © 2002, The National Academy of Sciences 2002 |
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| Snippet | Recent work on wild birds has revealed the importance of sperm competition as a source of sexual selection, but behavioral and paternity studies have... In a field study of collared flycatchers Ficedula albicollis, the authors used a previously uncharacterized method to determine the frequency and timing of... Recent work on wild birds has revealed the importance of sperm competition as a source of sexual selection, but behavioral and paternity studies have... |
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| SubjectTerms | Animal behavior Animal reproduction Animals Biological Sciences Birds Female Female animals Fertile period Fertilization Fertilization - physiology Ficedula albicollis Flycatchers Insemination Male Male animals Mating behavior Ova Ovum - physiology Sexual Behavior, Animal Songbirds Sperm competition Sperm-Ovum Interactions - physiology Spermatozoa Spermatozoa - cytology Spermatozoa - metabolism Time Factors |
| Title | Experimental Analysis of Sperm Competition Mechanisms in a Wild Bird Population |
| URI | https://www.jstor.org/stable/3058515 http://www.pnas.org/content/99/8/5466.abstract https://www.ncbi.nlm.nih.gov/pubmed/11943862 https://www.proquest.com/docview/201436911 https://search.proquest.com/docview/18321552 https://search.proquest.com/docview/71617559 https://pubmed.ncbi.nlm.nih.gov/PMC122792 |
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