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Sperm competition, mating rate and the evolution of testis and ejaculate sizes: a population model
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| Zeitschriftentitel: | Biology Letters |
|---|---|
| Personen und Körperschaften: | , |
| In: | Biology Letters, 1, 2005, 2, S. 235-238 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
The Royal Society
|
| Schlagwörter: |
| author_facet |
Parker, G.A Ball, M.A Parker, G.A Ball, M.A |
|---|---|
| author |
Parker, G.A Ball, M.A |
| spellingShingle |
Parker, G.A Ball, M.A Biology Letters Sperm competition, mating rate and the evolution of testis and ejaculate sizes: a population model General Agricultural and Biological Sciences Agricultural and Biological Sciences (miscellaneous) |
| author_sort |
parker, g.a |
| spelling |
Parker, G.A Ball, M.A 1744-9561 1744-957X The Royal Society General Agricultural and Biological Sciences Agricultural and Biological Sciences (miscellaneous) http://dx.doi.org/10.1098/rsbl.2004.0273 <jats:p> There are various ways to estimate ejaculate expenditure. Ejaculate size or sperm number ( <jats:italic>s</jats:italic> ) is an absolute number of units of ejaculate. Relative ejaculate expenditure ( <jats:italic>E</jats:italic> ) is the expenditure on the ejaculate as the proportion of the total expenditure on all aspects of the mating, including finding and acquiring a female, and so on. Relative testis size or gonadosomatic index ( <jats:italic>σ</jats:italic> ) is testes mass divided by body mass; it is assumed to reflect the product of mating rate ( <jats:italic>M</jats:italic> ) and ejaculate mass ( <jats:italic>s</jats:italic> ). In a new model, where mating rate, sperm competition and sperm allocation interact, and where the female's inter-clutch interval is assumed to be independent of <jats:italic>s</jats:italic> or <jats:italic>M</jats:italic> , we show that <jats:italic>σ</jats:italic> is directly proportional to the mean <jats:italic>E</jats:italic> for a species; across species <jats:italic>σ</jats:italic> and <jats:italic>E</jats:italic> increase monotonically with sperm competition. However, the relation between <jats:italic>s</jats:italic> and sperm competition across species depends on the range of sperm competition (low risk or high intensity): <jats:italic>s</jats:italic> increases with sperm competition at low risk levels, but decreases with sperm competition at high intensity levels. This situation arises because <jats:italic>s</jats:italic> ∝ <jats:italic>E</jats:italic> / <jats:italic>M</jats:italic> ; both <jats:italic>E</jats:italic> and <jats:italic>M</jats:italic> increase with sperm competition, but <jats:italic>E</jats:italic> increases differently with sperm competition in its two ranges. </jats:p> Sperm competition, mating rate and the evolution of testis and ejaculate sizes: a population model Biology Letters |
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10.1098/rsbl.2004.0273 |
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The Royal Society, 2005 |
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2005 |
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The Royal Society |
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Biology Letters |
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49 |
| title |
Sperm competition, mating rate and the evolution of testis and ejaculate sizes: a population model |
| title_unstemmed |
Sperm competition, mating rate and the evolution of testis and ejaculate sizes: a population model |
| title_full |
Sperm competition, mating rate and the evolution of testis and ejaculate sizes: a population model |
| title_fullStr |
Sperm competition, mating rate and the evolution of testis and ejaculate sizes: a population model |
| title_full_unstemmed |
Sperm competition, mating rate and the evolution of testis and ejaculate sizes: a population model |
| title_short |
Sperm competition, mating rate and the evolution of testis and ejaculate sizes: a population model |
| title_sort |
sperm competition, mating rate and the evolution of testis and ejaculate sizes: a population model |
| topic |
General Agricultural and Biological Sciences Agricultural and Biological Sciences (miscellaneous) |
| url |
http://dx.doi.org/10.1098/rsbl.2004.0273 |
| publishDate |
2005 |
| physical |
235-238 |
| description |
<jats:p>
There are various ways to estimate ejaculate expenditure. Ejaculate size or sperm number (
<jats:italic>s</jats:italic>
) is an absolute number of units of ejaculate. Relative ejaculate expenditure (
<jats:italic>E</jats:italic>
) is the expenditure on the ejaculate as the proportion of the total expenditure on all aspects of the mating, including finding and acquiring a female, and so on. Relative testis size or gonadosomatic index (
<jats:italic>σ</jats:italic>
) is testes mass divided by body mass; it is assumed to reflect the product of mating rate (
<jats:italic>M</jats:italic>
) and ejaculate mass (
<jats:italic>s</jats:italic>
). In a new model, where mating rate, sperm competition and sperm allocation interact, and where the female's inter-clutch interval is assumed to be independent of
<jats:italic>s</jats:italic>
or
<jats:italic>M</jats:italic>
, we show that
<jats:italic>σ</jats:italic>
is directly proportional to the mean
<jats:italic>E</jats:italic>
for a species; across species
<jats:italic>σ</jats:italic>
and
<jats:italic>E</jats:italic>
increase monotonically with sperm competition. However, the relation between
<jats:italic>s</jats:italic>
and sperm competition across species depends on the range of sperm competition (low risk or high intensity):
<jats:italic>s</jats:italic>
increases with sperm competition at low risk levels, but decreases with sperm competition at high intensity levels. This situation arises because
<jats:italic>s</jats:italic>
∝
<jats:italic>E</jats:italic>
/
<jats:italic>M</jats:italic>
; both
<jats:italic>E</jats:italic>
and
<jats:italic>M</jats:italic>
increase with sperm competition, but
<jats:italic>E</jats:italic>
increases differently with sperm competition in its two ranges.
</jats:p> |
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| author | Parker, G.A, Ball, M.A |
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| author_sort | parker, g.a |
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| description | <jats:p> There are various ways to estimate ejaculate expenditure. Ejaculate size or sperm number ( <jats:italic>s</jats:italic> ) is an absolute number of units of ejaculate. Relative ejaculate expenditure ( <jats:italic>E</jats:italic> ) is the expenditure on the ejaculate as the proportion of the total expenditure on all aspects of the mating, including finding and acquiring a female, and so on. Relative testis size or gonadosomatic index ( <jats:italic>σ</jats:italic> ) is testes mass divided by body mass; it is assumed to reflect the product of mating rate ( <jats:italic>M</jats:italic> ) and ejaculate mass ( <jats:italic>s</jats:italic> ). In a new model, where mating rate, sperm competition and sperm allocation interact, and where the female's inter-clutch interval is assumed to be independent of <jats:italic>s</jats:italic> or <jats:italic>M</jats:italic> , we show that <jats:italic>σ</jats:italic> is directly proportional to the mean <jats:italic>E</jats:italic> for a species; across species <jats:italic>σ</jats:italic> and <jats:italic>E</jats:italic> increase monotonically with sperm competition. However, the relation between <jats:italic>s</jats:italic> and sperm competition across species depends on the range of sperm competition (low risk or high intensity): <jats:italic>s</jats:italic> increases with sperm competition at low risk levels, but decreases with sperm competition at high intensity levels. This situation arises because <jats:italic>s</jats:italic> ∝ <jats:italic>E</jats:italic> / <jats:italic>M</jats:italic> ; both <jats:italic>E</jats:italic> and <jats:italic>M</jats:italic> increase with sperm competition, but <jats:italic>E</jats:italic> increases differently with sperm competition in its two ranges. </jats:p> |
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| physical | 235-238 |
| publishDate | 2005 |
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| publisher | The Royal Society |
| record_format | ai |
| recordtype | ai |
| series | Biology Letters |
| source_id | 49 |
| spelling | Parker, G.A Ball, M.A 1744-9561 1744-957X The Royal Society General Agricultural and Biological Sciences Agricultural and Biological Sciences (miscellaneous) http://dx.doi.org/10.1098/rsbl.2004.0273 <jats:p> There are various ways to estimate ejaculate expenditure. Ejaculate size or sperm number ( <jats:italic>s</jats:italic> ) is an absolute number of units of ejaculate. Relative ejaculate expenditure ( <jats:italic>E</jats:italic> ) is the expenditure on the ejaculate as the proportion of the total expenditure on all aspects of the mating, including finding and acquiring a female, and so on. Relative testis size or gonadosomatic index ( <jats:italic>σ</jats:italic> ) is testes mass divided by body mass; it is assumed to reflect the product of mating rate ( <jats:italic>M</jats:italic> ) and ejaculate mass ( <jats:italic>s</jats:italic> ). In a new model, where mating rate, sperm competition and sperm allocation interact, and where the female's inter-clutch interval is assumed to be independent of <jats:italic>s</jats:italic> or <jats:italic>M</jats:italic> , we show that <jats:italic>σ</jats:italic> is directly proportional to the mean <jats:italic>E</jats:italic> for a species; across species <jats:italic>σ</jats:italic> and <jats:italic>E</jats:italic> increase monotonically with sperm competition. However, the relation between <jats:italic>s</jats:italic> and sperm competition across species depends on the range of sperm competition (low risk or high intensity): <jats:italic>s</jats:italic> increases with sperm competition at low risk levels, but decreases with sperm competition at high intensity levels. This situation arises because <jats:italic>s</jats:italic> ∝ <jats:italic>E</jats:italic> / <jats:italic>M</jats:italic> ; both <jats:italic>E</jats:italic> and <jats:italic>M</jats:italic> increase with sperm competition, but <jats:italic>E</jats:italic> increases differently with sperm competition in its two ranges. </jats:p> Sperm competition, mating rate and the evolution of testis and ejaculate sizes: a population model Biology Letters |
| spellingShingle | Parker, G.A, Ball, M.A, Biology Letters, Sperm competition, mating rate and the evolution of testis and ejaculate sizes: a population model, General Agricultural and Biological Sciences, Agricultural and Biological Sciences (miscellaneous) |
| title | Sperm competition, mating rate and the evolution of testis and ejaculate sizes: a population model |
| title_full | Sperm competition, mating rate and the evolution of testis and ejaculate sizes: a population model |
| title_fullStr | Sperm competition, mating rate and the evolution of testis and ejaculate sizes: a population model |
| title_full_unstemmed | Sperm competition, mating rate and the evolution of testis and ejaculate sizes: a population model |
| title_short | Sperm competition, mating rate and the evolution of testis and ejaculate sizes: a population model |
| title_sort | sperm competition, mating rate and the evolution of testis and ejaculate sizes: a population model |
| title_unstemmed | Sperm competition, mating rate and the evolution of testis and ejaculate sizes: a population model |
| topic | General Agricultural and Biological Sciences, Agricultural and Biological Sciences (miscellaneous) |
| url | http://dx.doi.org/10.1098/rsbl.2004.0273 |