{"doi":"10.1111/j.1420-9101.2009.01724.x","title":"Sperm competition and maternal effects differentially influence testis and sperm size in <i>Callosobruchus maculatus</i>","abstract":"<jats:title>Abstract</jats:title><jats:p>The evolutionary factors affecting testis size are well documented, with sperm competition being of major importance. However, the factors affecting sperm length are not well understood; there are no clear theoretical predictions and the empirical evidence is inconsistent. Recently, maternal effects have been implicated in sperm length variation, a finding that may offer insights into its evolution. We investigated potential proximate and microevolutionary factors influencing testis and sperm size in the bruchid beetle <jats:italic>Callosobruchus maculatus</jats:italic> using a combined approach of an artificial evolution experiment over 90 generations and an environmental effects study. We found that while polyandry seems to select for larger testes, it had no detectable effect on sperm length. Furthermore, population density, a proximate indicator of sperm competition risk, was not significantly associated with sperm length or testis size variation. However, there were strong maternal effects influencing sperm length.</jats:p>","journal":"Journal of Evolutionary Biology","year":2009,"id":13616,"datarank":2.7057832881819555,"base_score":4.174387269895637,"endowment":4.174387269895637,"self_citation_contribution":0.6261580904843456,"citation_network_contribution":2.07962519769761,"self_endowment_contribution":0.6261580904843456,"citer_contribution":2.07962519769761,"corpus_percentile":null,"corpus_rank":null,"citation_count":64,"citer_count":59,"citers_with_citation_signal":52,"citers_with_endowment":52,"datacite_reuse_total":2,"is_dataset":false,"is_dataset_confidence":null,"is_oa":false,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":null,"fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":110965,"name":"D. J. HOSKEN","orcid":null,"position":1,"is_corresponding":false},{"id":110966,"name":"R. VASUDEV","orcid":null,"position":2,"is_corresponding":false},{"id":110967,"name":"T. TREGENZA","orcid":null,"position":3,"is_corresponding":false},{"id":110968,"name":"P. E. EADY","orcid":null,"position":4,"is_corresponding":false},{"id":110964,"name":"L. GAY","orcid":null,"position":0,"is_corresponding":false}],"reference_count":0,"raw_metadata":{"has_enrichment":true,"base_score":4.174387269895637,"endowment":4.174387269895637,"datacite_reuse_total":2,"file_count":0,"downloads":0,"views":0,"has_version_chain":false,"is_dataset":false,"is_oa":false,"pmid":"19309491","pmcid":null,"openalex_id":"https://openalex.org/W2029147684","authors":[],"funders":[{"funder_name":"Natural Environment Research Council","grant_id":"NE/D011183/1","title":null}],"total_grants":1,"fwci":7.7546,"citation_percentile":0.96870921,"influential_citations":4,"citation_trend":[{"year":2012,"count":3},{"year":2013,"count":4},{"year":2014,"count":5},{"year":2015,"count":5},{"year":2016,"count":3},{"year":2017,"count":3},{"year":2019,"count":5},{"year":2020,"count":5},{"year":2021,"count":9},{"year":2022,"count":4},{"year":2023,"count":3},{"year":2024,"count":1},{"year":2025,"count":1},{"year":2026,"count":2}],"oa_status":"bronze","license":"http://onlinelibrary.wiley.com/termsAndConditions#vor","oa_locations":[{"url":"https://onlinelibrary.wiley.com/doi/pdfdirect/10.1111/j.1420-9101.2009.01724.x","host_type":"journal"},{"url":"https://onlinelibrary.wiley.com/doi/pdfdirect/10.1111/j.1420-9101.2009.01724.x","host_type":"BRONZE"},{"url":"https://onlinelibrary.wiley.com/doi/pdfdirect/10.1111/j.1420-9101.2009.01724.x","host_type":"publisher"},{"url":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1420-9101.2009.01724.x","host_type":"publisher"},{"url":"https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1420-9101.2009.01724.x","host_type":"publisher"},{"url":"https://doi.org/10.1111/j.1420-9101.2009.01724.x","host_type":"journal"},{"url":"https://pubmed.ncbi.nlm.nih.gov/19309491","host_type":"repository"},{"url":"https://ueaeprints.uea.ac.uk/id/eprint/95834/","host_type":"repository"}],"fields_of_study":["Plant and animal studies","Insect and Arachnid Ecology and Behavior","Animal Behavior and Reproduction","Biology","Medicine","Environmental Science","Animals","Coleoptera","Female","Male","Maternal Age","Niger","Organ Size","Population Density","Regression Analysis","Sexual Behavior, Animal","Sperm Transport","Spermatozoa","Statistics, Nonparametric","Testis"],"mesh_terms":["Animals","Coleoptera","Female","Male","Maternal Age","Niger","Organ Size","Population Density","Regression Analysis","Sexual Behavior, Animal","Sperm Transport","Spermatozoa","Testis","Statistics, Nonparametric"],"keywords":["Callosobruchus maculatus","Sperm","Biology","Sperm competition","Zoology","Competition (biology)","Population","Evolutionary biology","Reproductive success","Female sperm storage","Ecology","Andrology","Botany","PEST analysis","Demography"],"sdg_mappings":[{"sdg_number":0,"sdg_label":"Life in Land"}],"linked_datasets":[{"doi":"10.6084/m9.figshare.14721690.v1","title":"Additional file 2 of Sexual conflict drives micro- and macroevolution of sexual dimorphism in immunity","publisher":"figshare","resource_type":"JournalArticle"},{"doi":"10.6084/m9.figshare.14721690","title":"Additional file 2 of Sexual conflict drives micro- and macroevolution of sexual dimorphism in immunity","publisher":"figshare","resource_type":"JournalArticle"}],"clinical_trials":[],"software_tools":[],"database_accessions":[],"source":"live","citation_network_status":"fetched"},"created_at":"2026-05-31T05:49:09.984064Z","pmid":null,"pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}