Variation in Apical Hook Length Reflects the Intensity of Sperm Competition in Murine Rodents
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{"title"=>"Variation in Apical Hook Length Reflects the Intensity of Sperm Competition in Murine Rodents", "type"=>"journal", "authors"=>[{"first_name"=>"Martin", "last_name"=>"Šandera", "scopus_author_id"=>"24588202100"}, {"first_name"=>"Tomáš", "last_name"=>"Albrecht", "scopus_author_id"=>"7103045226"}, {"first_name"=>"Pavel", "last_name"=>"Stopka", "scopus_author_id"=>"56626804100"}], "year"=>2013, "source"=>"PLoS ONE", "identifiers"=>{"pui"=>"369253511", "sgr"=>"84879753962", "issn"=>"19326203", "pmid"=>"23844198", "scopus"=>"2-s2.0-84879753962", "doi"=>"10.1371/journal.pone.0068427"}, "id"=>"fb3d5936-2c43-35fb-9c6e-f233371f8e3c", "abstract"=>"BACKGROUND: Post-copulatory sexual selection has been shown to shape morphology of male gametes. Both directional and stabilizing selection on sperm phenotype have been documented in vertebrates in response to sexual promiscuity.\\n\\nMETHODOLOGY: Here we investigated the degree of variance in apical hook length and tail length in six taxa of murine rodents.\\n\\nCONCLUSIONS: Tail sperm length and apical hook length were positively associated with relative testis mass, our proxy for levels of sperm competition, thus indicating directional post-copulatory selection on sperm phenotypes. Moreover, our study shows that increased levels of sperm competition lead to the reduction of variance in the hook length, indicating stabilizing selection. Hence, the higher risk of sperm competition affects increasing hook length together with decreasing variance in the hook length. Species-specific post-copulatory sexual selection likely optimizes sperm morphology.", "link"=>"http://www.mendeley.com/research/variation-apical-hook-length-reflects-intensity-sperm-competition-murine-rodents", "reader_count"=>15, "reader_count_by_academic_status"=>{"Professor > Associate Professor"=>1, "Researcher"=>5, "Student > Doctoral Student"=>2, "Student > Ph. D. Student"=>4, "Student > Master"=>1, "Student > Bachelor"=>2}, "reader_count_by_user_role"=>{"Professor > Associate Professor"=>1, "Researcher"=>5, "Student > Doctoral Student"=>2, "Student > Ph. D. Student"=>4, "Student > Master"=>1, "Student > Bachelor"=>2}, "reader_count_by_subject_area"=>{"Unspecified"=>1, "Biochemistry, Genetics and Molecular Biology"=>1, "Agricultural and Biological Sciences"=>12, "Medicine and Dentistry"=>1}, "reader_count_by_subdiscipline"=>{"Medicine and Dentistry"=>{"Medicine and Dentistry"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>12}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>1}, "Unspecified"=>{"Unspecified"=>1}}, "reader_count_by_country"=>{"Canada"=>1, "Czech Republic"=>1, "Serbia and Montenegro"=>1, "Switzerland"=>1}, "group_count"=>0}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/1110708"], "description"=>"<div><p>Background</p><p>Post-copulatory sexual selection has been shown to shape morphology of male gametes. Both directional and stabilizing selection on sperm phenotype have been documented in vertebrates in response to sexual promiscuity.</p><p>Methodology</p><p>Here we investigated the degree of variance in apical hook length and tail length in six taxa of murine rodents.</p><p>Conclusions</p><p>Tail sperm length and apical hook length were positively associated with relative testis mass, our proxy for levels of sperm competition, thus indicating directional post-copulatory selection on sperm phenotypes. Moreover, our study shows that increased levels of sperm competition lead to the reduction of variance in the hook length, indicating stabilizing selection. Hence, the higher risk of sperm competition affects increasing hook length together with decreasing variance in the hook length. Species-specific post-copulatory sexual selection likely optimizes sperm morphology.</p></div>", "links"=>[], "tags"=>["Anatomy and physiology", "Reproductive system", "Sexual reproduction", "developmental biology", "fertilization", "Sperm hyperactivation", "Evolutionary biology", "Behavioral ecology", "Evolutionary ecology", "Zoology", "Mammalogy", "apical", "reflects", "sperm", "murine"], "article_id"=>739088, "categories"=>["Medicine", "Biological Sciences"], "users"=>["Martin Šandera", "Tomáš Albrecht", "Pavel Stopka"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0068427", "stats"=>{"downloads"=>0, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Variation_in_Apical_Hook_Length_Reflects_the_Intensity_of_Sperm_Competition_in_Murine_Rodents_/739088", "title"=>"Variation in Apical Hook Length Reflects the Intensity of Sperm Competition in Murine Rodents", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-07-03 03:20:55"}
  • {"files"=>["https://ndownloader.figshare.com/files/1110706"], "description"=>"<p>A) Relationship between relative testis weight and within-male variation in sperm hook length. The figure illustrates the linear regression of the coefficient of within-male variation in apical hook length on the proportion of relative testis weight for six studied rodent species. B) Relationship between relative testis weight and between-male variation in sperm hook length. The figure illustrates the linear regression of the coefficient of within-male variation on the proportion of relative testis weight in apical hook length for six studied rodent species.</p>", "links"=>[], "tags"=>["Anatomy and physiology", "Reproductive system", "Sexual reproduction", "developmental biology", "fertilization", "Sperm hyperactivation", "Evolutionary biology", "Behavioral ecology", "Evolutionary ecology", "Zoology", "Mammalogy", "testis", "sperm", "murine"], "article_id"=>739086, "categories"=>["Medicine", "Biological Sciences"], "users"=>["Martin Šandera", "Tomáš Albrecht", "Pavel Stopka"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0068427.g002", "stats"=>{"downloads"=>0, "page_views"=>3, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Relationships_between_relative_testis_weight_and_variation_in_sperm_hook_length_in_murine_rodents_/739086", "title"=>"Relationships between relative testis weight and variation in sperm hook length in murine rodents.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-07-03 03:20:55"}
  • {"files"=>["https://ndownloader.figshare.com/files/1110704"], "description"=>"<p>The figure illustrates the phylogenetic relationships among the studied species <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0068427#pone.0068427-Martin1\" target=\"_blank\">[40]</a>, <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0068427#pone.0068427-Michaux1\" target=\"_blank\">[41]</a>, <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0068427#pone.0068427-Suzuki1\" target=\"_blank\">[42]</a>.</p>", "links"=>[], "tags"=>["Anatomy and physiology", "Reproductive system", "Sexual reproduction", "developmental biology", "fertilization", "Sperm hyperactivation", "Evolutionary biology", "Behavioral ecology", "Evolutionary ecology", "Zoology", "Mammalogy", "studied"], "article_id"=>739084, "categories"=>["Medicine", "Biological Sciences"], "users"=>["Martin Šandera", "Tomáš Albrecht", "Pavel Stopka"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0068427.g001", "stats"=>{"downloads"=>0, "page_views"=>3, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Phylogeny_of_studied_species_/739084", "title"=>"Phylogeny of studied species.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-07-03 03:20:55"}
  • {"files"=>["https://ndownloader.figshare.com/files/1110707"], "description"=>"<p>CV<sub>wm</sub> is the average coefficient of within-male variation in hook length and tail length. CV<sub>bm</sub> is the coefficient of between-male variation in sperm traits, adjusted for sample size (see Methods). The statistical analyses were performed in R and based on transformed variables to approach normality (arcsine square-root for the proportion of relative testis weight, log for CV<sub>wm</sub> and CV<sub>bm</sub>). Slopes were tested against the prediction of 0 using the <i>t</i>-test. Lambda (λ) indicates the level of phylogenetic dependence in the data, with superscripts giving p-values for test of λ = 0 and λ = 1 respectively. R<sup>2</sup> values indicate the proportion of total variance explained.</p>", "links"=>[], "tags"=>["Anatomy and physiology", "Reproductive system", "Sexual reproduction", "developmental biology", "fertilization", "Sperm hyperactivation", "Evolutionary biology", "Behavioral ecology", "Evolutionary ecology", "Zoology", "Mammalogy", "linear", "testis", "post-copulatory", "sperm"], "article_id"=>739087, "categories"=>["Medicine", "Biological Sciences"], "users"=>["Martin Šandera", "Tomáš Albrecht", "Pavel Stopka"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0068427.t001", "stats"=>{"downloads"=>0, "page_views"=>3, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Generalised_linear_least_square_tests_of_a_the_effect_of_the_relative_testis_weight_proxy_measure_for_post_copulatory_sexual_selection_on_sperm_length_traits_b_the_effect_of_hook_length_on_its_variation_c_the_effect_of_sperm_tail_length_on_its_variation_/739087", "title"=>"Generalised linear least square tests of: a) the effect of the relative testis weight (proxy measure for post-copulatory sexual selection) on sperm length traits, b) the effect of hook length on its variation c) the effect of sperm tail length on its variation.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-07-03 03:20:55"}

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Relative Metric

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