Sperm Competition Selects for Sperm Quantity and Quality in the Australian Maluridae
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{"title"=>"Sperm competition selects for sperm quantity and quality in the Australian Maluridae", "type"=>"journal", "authors"=>[{"first_name"=>"Melissah", "last_name"=>"Rowe", "scopus_author_id"=>"14325742100"}, {"first_name"=>"Stephen", "last_name"=>"Pruett-Jones", "scopus_author_id"=>"6603853046"}], "year"=>2011, "source"=>"PLoS ONE", "identifiers"=>{"pmid"=>"21283577", "doi"=>"10.1371/journal.pone.0015720", "sgr"=>"79551514296", "isbn"=>"1932-6203 (Electronic)\\r1932-6203 (Linking)", "scopus"=>"2-s2.0-79551514296", "issn"=>"19326203", "pui"=>"361204327"}, "id"=>"58e03168-2833-3555-b979-f2859a96fcf4", "abstract"=>"When ejaculates from rival males compete for fertilization, there is strong selection for sperm traits that enhance fertilization success. Sperm quantity is one such trait, and numerous studies have demonstrated a positive association between sperm competition and both testes size and the number of sperm available for copulations. Sperm competition is also thought to favor increases in sperm quality and changes in testicular morphology that lead to increased sperm production. However, in contrast to sperm quantity, these hypotheses have received considerably less empirical support and remain somewhat controversial. In a comparative study using the Australian Maluridae (fairy-wrens, emu-wrens, grasswrens), we tested whether increasing levels of sperm competition were associated with increases in both sperm quantity and quality, as well as an increase in the relative amount of seminiferous tubule tissue contained within the testes. After controlling for phylogeny, we found positive associations between sperm competition and sperm numbers, both in sperm reserves and in ejaculate samples. Additionally, as sperm competition level increased, the proportion of testicular spermatogenic tissue also increased, suggesting that sperm competition selects for greater sperm production per unit of testicular tissue. Finally, we also found that sperm competition level was positively associated with multiple sperm quality traits, including the proportion of motile sperm in ejaculates and the proportion of both viable and morphologically normal sperm in sperm reserves. These results suggest multiple ejaculate traits, as well as aspects of testicular morphology, have evolved in response to sperm competition in the Australian Maluridae. Furthermore, our findings emphasize the importance of post-copulatory sexual selection as an evolutionary force shaping macroevolutionary differences in sperm phenotype.", "link"=>"http://www.mendeley.com/research/sperm-competition-selects-sperm-quantity-quality-australian-maluridae", "reader_count"=>72, "reader_count_by_academic_status"=>{"Unspecified"=>1, "Professor > Associate Professor"=>1, "Researcher"=>15, "Student > Doctoral Student"=>4, "Student > Ph. D. Student"=>23, "Student > Postgraduate"=>3, "Other"=>1, "Student > Master"=>5, "Student > Bachelor"=>13, "Lecturer"=>1, "Lecturer > Senior Lecturer"=>2, "Professor"=>3}, "reader_count_by_user_role"=>{"Unspecified"=>1, "Professor > Associate Professor"=>1, "Researcher"=>15, "Student > Doctoral Student"=>4, "Student > Ph. D. Student"=>23, "Student > Postgraduate"=>3, "Other"=>1, "Student > Master"=>5, "Student > Bachelor"=>13, "Lecturer"=>1, "Lecturer > Senior Lecturer"=>2, "Professor"=>3}, "reader_count_by_subject_area"=>{"Unspecified"=>6, "Biochemistry, Genetics and Molecular Biology"=>2, "Agricultural and Biological Sciences"=>61, "Medicine and Dentistry"=>1, "Neuroscience"=>1, "Chemistry"=>1}, "reader_count_by_subdiscipline"=>{"Medicine and Dentistry"=>{"Medicine and Dentistry"=>1}, "Neuroscience"=>{"Neuroscience"=>1}, "Chemistry"=>{"Chemistry"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>61}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>2}, "Unspecified"=>{"Unspecified"=>6}}, "reader_count_by_country"=>{"Canada"=>1, "Czech Republic"=>1, "Romania"=>1, "United States"=>1, "Mexico"=>1, "South Africa"=>1, "Australia"=>1, "Spain"=>1}, "group_count"=>1}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/803291"], "description"=>"<p>Figure is not controlled for phylogeny (unlike analysis) and relative testes mass indicates the use of residual values from a linear regression of testis mass on body mass. Each data point represents a species. For further statistical details see main text.</p>", "links"=>[], "tags"=>["testes", "spermatogenic", "contained", "australian"], "article_id"=>473657, "categories"=>["Physiology", "Neuroscience", "Ecology", "Evolutionary Biology"], "users"=>["Melissah Rowe", "Stephen Pruett-Jones"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0015720.g001", "stats"=>{"downloads"=>0, "page_views"=>1, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Relationship_between_relative_testes_size_and_the_proportion_of_spermatogenic_tissue_contained_within_the_testes_in_eight_species_of_Australian_Maluridae_/473657", "title"=>"Relationship between relative testes size and the proportion of spermatogenic tissue contained within the testes in eight species of Australian Maluridae.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2011-01-25 01:00:57"}
  • {"files"=>["https://ndownloader.figshare.com/files/803359"], "description"=>"<p>Unlike all analyses, figures are not controlled for phylogeny. The values for relative testes mass are the residuals obtained from a linear regression of testes mass on body mass. Proportion data are arcsine-transformed. Each data point represents a species. See main text for further statistical details.</p>", "links"=>[], "tags"=>["sperm", "testes", "motile", "viable", "morphologically"], "article_id"=>473725, "categories"=>["Physiology", "Neuroscience", "Ecology", "Evolutionary Biology"], "users"=>["Melissah Rowe", "Stephen Pruett-Jones"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0015720.g002", "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Relationship_between_the_level_of_sperm_competition_measured_as_relative_testes_size_and_a_the_proportion_of_motile_sperm_in_ejaculates_b_the_proportion_of_viable_sperm_in_sperm_stores_and_c_the_proportion_of_morphologically_normal_sperm_in_sperm_stores_/473725", "title"=>"Relationship between the level of sperm competition (measured as relative testes size) and a) the proportion of motile sperm in ejaculates, b) the proportion of viable sperm in sperm stores, and c) the proportion of morphologically normal sperm in sperm stores.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2011-01-25 01:02:05"}
  • {"files"=>["https://ndownloader.figshare.com/files/803470"], "description"=>"<p>The model including the maximum-likelihood value of λ was compared against the models including λ = 0 and λ = 1, and superscripts following the λ estimates indicate significance levels of the likelihood-ratio testes (first position: against λ = 0; second position: against λ = 1).</p>", "links"=>[], "tags"=>["regression", "analyses", "controlling", "phylogeny", "sperm", "testis", "australian"], "article_id"=>473837, "categories"=>["Physiology", "Neuroscience", "Ecology", "Evolutionary Biology"], "users"=>["Melissah Rowe", "Stephen Pruett-Jones"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0015720.t002", "stats"=>{"downloads"=>3, "page_views"=>3, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Multiple_regression_analyses_controlling_for_phylogeny_GLS_of_sperm_quantity_and_quality_in_relation_to_combined_testis_mass_and_body_mass_across_eight_species_of_Australian_Maluridae_/473837", "title"=>"Multiple regression analyses controlling for phylogeny (GLS) of sperm quantity and quality in relation to combined testis mass and body mass across eight species of Australian Maluridae.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2011-01-25 01:03:57"}
  • {"files"=>["https://ndownloader.figshare.com/files/401455", "https://ndownloader.figshare.com/files/401488"], "description"=>"<div><p>When ejaculates from rival males compete for fertilization, there is strong selection for sperm traits that enhance fertilization success. Sperm quantity is one such trait, and numerous studies have demonstrated a positive association between sperm competition and both testes size and the number of sperm available for copulations. Sperm competition is also thought to favor increases in sperm quality and changes in testicular morphology that lead to increased sperm production. However, in contrast to sperm quantity, these hypotheses have received considerably less empirical support and remain somewhat controversial. In a comparative study using the Australian Maluridae (fairy-wrens, emu-wrens, grasswrens), we tested whether increasing levels of sperm competition were associated with increases in both sperm quantity and quality, as well as an increase in the relative amount of seminiferous tubule tissue contained within the testes. After controlling for phylogeny, we found positive associations between sperm competition and sperm numbers, both in sperm reserves and in ejaculate samples. Additionally, as sperm competition level increased, the proportion of testicular spermatogenic tissue also increased, suggesting that sperm competition selects for greater sperm production per unit of testicular tissue. Finally, we also found that sperm competition level was positively associated with multiple sperm quality traits, including the proportion of motile sperm in ejaculates and the proportion of both viable and morphologically normal sperm in sperm reserves. These results suggest multiple ejaculate traits, as well as aspects of testicular morphology, have evolved in response to sperm competition in the Australian Maluridae. Furthermore, our findings emphasize the importance of post-copulatory sexual selection as an evolutionary force shaping macroevolutionary differences in sperm phenotype.</p> </div>", "links"=>[], "tags"=>["sperm", "selects", "australian", "maluridae"], "article_id"=>139326, "categories"=>["Physiology", "Neuroscience", "Ecology", "Evolutionary Biology"], "users"=>["Melissah Rowe", "Stephen Pruett-Jones"], "doi"=>["https://dx.doi.org/10.1371/journal.pone.0015720.s001", "https://dx.doi.org/10.1371/journal.pone.0015720.s002"], "stats"=>{"downloads"=>4, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Sperm_Competition_Selects_for_Sperm_Quantity_and_Quality_in_the_Australian_Maluridae/139326", "title"=>"Sperm Competition Selects for Sperm Quantity and Quality in the Australian Maluridae", "pos_in_sequence"=>0, "defined_type"=>4, "published_date"=>"2011-01-25 02:35:26"}
  • {"files"=>["https://ndownloader.figshare.com/files/803440"], "description"=>"<p>CTM = combined testes mass, GSI = gonadosomatic index.</p><p>Cloacal protuberance (CP) volume and seminal glomera (SG) mass represent indirect measures of sperm quantity, while the number of sperm in sperm stores (sperm reserves) and the number of sperm in ejaculate samples (ejaculate size) represent direct measures of sperm quantity.</p><p>Species differed significantly in all four measures of sperm quantity: CP volume (ANOVA: <i>F</i><sub>7,238</sub> = 43.66, <i>P</i><0.001), SG mass (ANOVA, <i>F</i><sub>7,45</sub> = 20.96, <i>P</i><0.001), sperm reserves (ANOVA, <i>F</i><sub>7,46</sub> = 18.94, <i>P</i><0.001), and ejaculate size (ANOVA, <i>F</i><sub>6,217</sub> = 8.87, <i>P</i><0.001).</p><p>*Ejaculate samples were not collected from the southern emu-wren due to logistical problems during the 2006 field season.</p><p>Sample sizes for all traits are shown in <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0015720#pone.0015720.s001\" target=\"_blank\">Supplementary Table 1</a>.</p>", "links"=>[], "tags"=>["testis", "morphology", "sperm", "australian"], "article_id"=>473807, "categories"=>["Physiology", "Neuroscience", "Ecology", "Evolutionary Biology"], "users"=>["Melissah Rowe", "Stephen Pruett-Jones"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0015720.t001", "stats"=>{"downloads"=>7, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Descriptive_statistics_of_testis_morphology_and_sperm_quantity_in_eight_species_of_Australian_Maluridae_/473807", "title"=>"Descriptive statistics of testis morphology and sperm quantity in eight species of Australian Maluridae.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2011-01-25 01:03:27"}

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Relative Metric

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