Estimation of Sexual Maturity Based on Morphometrics of Genital Organs in Male Northern Fur Seals, Callorhinus ursinus
It's not always possible to obtain samples from dead male pinnipeds that are fresh enough to determine the histological characteristics of spermatogenesis and their stage of sexual maturity. We propose that the morphometrics of genital organs of northern fur seals, Callorhinus ursinus, can be u...
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| Veröffentlicht in: | MAMMAL STUDY 2021-01, Vol.46 (1), p.41-51 |
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| creator | Hirakawa, Yukino Horimoto, Takanori Suzuki, Ippei Mitani, Yoko |
| description | It's not always possible to obtain samples from dead male pinnipeds that are fresh enough to determine the histological characteristics of spermatogenesis and their stage of sexual maturity. We propose that the morphometrics of genital organs of northern fur seals, Callorhinus ursinus, can be used as a new indicator of sexual maturity. We analyzed data from collected records of male fur seals around Hokkaido during 2011–2017 to examine morphometrics of genital organs and their stage in histological characteristics of spermatogenesis. First, we investigated ontogenetic and seasonal variation in three genital organs: testes, epididymides, and bacula. Second, we classified the stages of histological characteristics of spermatogenesis into three groups (Stage A–C) using non-linear discriminant analysis, based on the stage in histological characteristics of spermatogenesis determined by histological observation of seminiferous tubules. Testicular size, testicular mass, and epididymal mass showed seasonal variation associated with spermatogenesis. From our analysis, the stage in histological characteristics of spermatogenesis could be estimated using testicular mass with high accuracy of predicting spermatogenesis. And measurement of baculum was suggested to be an indicator of predicting sexual maturity. We conclude that this simple estimation may be used to determine sexual maturity based on individual growth patterns. |
| doi_str_mv | 10.3106/ms2020-0004 |
| format | Article |
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We propose that the morphometrics of genital organs of northern fur seals, Callorhinus ursinus, can be used as a new indicator of sexual maturity. We analyzed data from collected records of male fur seals around Hokkaido during 2011–2017 to examine morphometrics of genital organs and their stage in histological characteristics of spermatogenesis. First, we investigated ontogenetic and seasonal variation in three genital organs: testes, epididymides, and bacula. Second, we classified the stages of histological characteristics of spermatogenesis into three groups (Stage A–C) using non-linear discriminant analysis, based on the stage in histological characteristics of spermatogenesis determined by histological observation of seminiferous tubules. Testicular size, testicular mass, and epididymal mass showed seasonal variation associated with spermatogenesis. From our analysis, the stage in histological characteristics of spermatogenesis could be estimated using testicular mass with high accuracy of predicting spermatogenesis. And measurement of baculum was suggested to be an indicator of predicting sexual maturity. We conclude that this simple estimation may be used to determine sexual maturity based on individual growth patterns.</description><identifier>ISSN: 1343-4152</identifier><identifier>ISSN: 1348-6160</identifier><identifier>EISSN: 1348-6160</identifier><identifier>DOI: 10.3106/ms2020-0004</identifier><language>eng</language><publisher>Tokyo: UniBio Press</publisher><subject>Aquatic mammals ; bacula ; Callorhinus ursinus ; Discriminant analysis ; epididymises ; Growth patterns ; Marine mammals ; Maturity ; Morphometry ; Nonlinear analysis ; Ontogeny ; Organs ; ORIGINAL PAPERS ; reproduction ; Seals ; Seasonal variations ; Sexual maturity ; Spermatogenesis ; Testes ; Tubules ; Urogenital system</subject><ispartof>MAMMAL STUDY, 2021-01, Vol.46 (1), p.41-51</ispartof><rights>The Mammal Society of Japan</rights><rights>Copyright BioOne Jan 2021</rights><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-b483t-53402a6bc1ef70c3ba832acc5aa3e073286b04998b0290c9e052497ea783cb313</citedby><cites>FETCH-LOGICAL-b483t-53402a6bc1ef70c3ba832acc5aa3e073286b04998b0290c9e052497ea783cb313</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Hirakawa, Yukino</creatorcontrib><creatorcontrib>Horimoto, Takanori</creatorcontrib><creatorcontrib>Suzuki, Ippei</creatorcontrib><creatorcontrib>Mitani, Yoko</creatorcontrib><creatorcontrib>Graduate School of Environmental Science</creatorcontrib><creatorcontrib>Wakkanai Fisheries Research Institute</creatorcontrib><creatorcontrib>Hokkaido Research Organization</creatorcontrib><creatorcontrib>Field Science Center for Northern Biosphere</creatorcontrib><creatorcontrib>Hokkaido University</creatorcontrib><title>Estimation of Sexual Maturity Based on Morphometrics of Genital Organs in Male Northern Fur Seals, Callorhinus ursinus</title><title>MAMMAL STUDY</title><description>It's not always possible to obtain samples from dead male pinnipeds that are fresh enough to determine the histological characteristics of spermatogenesis and their stage of sexual maturity. We propose that the morphometrics of genital organs of northern fur seals, Callorhinus ursinus, can be used as a new indicator of sexual maturity. We analyzed data from collected records of male fur seals around Hokkaido during 2011–2017 to examine morphometrics of genital organs and their stage in histological characteristics of spermatogenesis. First, we investigated ontogenetic and seasonal variation in three genital organs: testes, epididymides, and bacula. Second, we classified the stages of histological characteristics of spermatogenesis into three groups (Stage A–C) using non-linear discriminant analysis, based on the stage in histological characteristics of spermatogenesis determined by histological observation of seminiferous tubules. Testicular size, testicular mass, and epididymal mass showed seasonal variation associated with spermatogenesis. From our analysis, the stage in histological characteristics of spermatogenesis could be estimated using testicular mass with high accuracy of predicting spermatogenesis. And measurement of baculum was suggested to be an indicator of predicting sexual maturity. We conclude that this simple estimation may be used to determine sexual maturity based on individual growth patterns.</description><subject>Aquatic mammals</subject><subject>bacula</subject><subject>Callorhinus ursinus</subject><subject>Discriminant analysis</subject><subject>epididymises</subject><subject>Growth patterns</subject><subject>Marine mammals</subject><subject>Maturity</subject><subject>Morphometry</subject><subject>Nonlinear analysis</subject><subject>Ontogeny</subject><subject>Organs</subject><subject>ORIGINAL PAPERS</subject><subject>reproduction</subject><subject>Seals</subject><subject>Seasonal variations</subject><subject>Sexual maturity</subject><subject>Spermatogenesis</subject><subject>Testes</subject><subject>Tubules</subject><subject>Urogenital system</subject><issn>1343-4152</issn><issn>1348-6160</issn><issn>1348-6160</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNp9kU1rGzEQhpfQQh23p_4BQSAQmk1HH_t1TEziBJLm0PYstLIcy-yuHElb7H-fUdaQW08zoGeeGV5l2XcKV5xC-bMPDBjkACBOshnlos5LWsKn957nghbsS3YawhaA86Kis-zfbYi2V9G6gbg1-W32o-rIk4qjt_FAblQwK4JvT87vNq430VsdErk0g42IPvsXNQRiEVGdIb-cjxvjB3I3erSpLlySheo65zd2GAMZfUj1a_Z5jW_m27HOs793t38W9_nj8_Jhcf2Yt6LmMS-4AKbKVlOzrkDzVtWcKa0LpbiBirO6bEE0Td0Ca0A3Bgommsqoqua65ZTPs7PJu_PudTQhyq0b_YArJRN1SRtRUUDqx0Rp70LwZi13HkPxB0lBpmDlFKxMwSJ9fnRa4z9IDFimgKUoAcdEWr6cwN6srFadGzo7mI8LVnvaqx5vQjdFdxrEUqY2NQXlFf5SwdB0MZla6xwq_nfeG-v9mfU</recordid><startdate>20210101</startdate><enddate>20210101</enddate><creator>Hirakawa, Yukino</creator><creator>Horimoto, Takanori</creator><creator>Suzuki, Ippei</creator><creator>Mitani, Yoko</creator><general>UniBio Press</general><general>The Mammal Society of Japan</general><general>BioOne</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QG</scope><scope>7SN</scope><scope>C1K</scope></search><sort><creationdate>20210101</creationdate><title>Estimation of Sexual Maturity Based on Morphometrics of Genital Organs in Male Northern Fur Seals, Callorhinus ursinus</title><author>Hirakawa, Yukino ; Horimoto, Takanori ; Suzuki, Ippei ; Mitani, Yoko</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-b483t-53402a6bc1ef70c3ba832acc5aa3e073286b04998b0290c9e052497ea783cb313</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Aquatic mammals</topic><topic>bacula</topic><topic>Callorhinus ursinus</topic><topic>Discriminant analysis</topic><topic>epididymises</topic><topic>Growth patterns</topic><topic>Marine mammals</topic><topic>Maturity</topic><topic>Morphometry</topic><topic>Nonlinear analysis</topic><topic>Ontogeny</topic><topic>Organs</topic><topic>ORIGINAL PAPERS</topic><topic>reproduction</topic><topic>Seals</topic><topic>Seasonal variations</topic><topic>Sexual maturity</topic><topic>Spermatogenesis</topic><topic>Testes</topic><topic>Tubules</topic><topic>Urogenital system</topic><toplevel>online_resources</toplevel><creatorcontrib>Hirakawa, Yukino</creatorcontrib><creatorcontrib>Horimoto, Takanori</creatorcontrib><creatorcontrib>Suzuki, Ippei</creatorcontrib><creatorcontrib>Mitani, Yoko</creatorcontrib><creatorcontrib>Graduate School of Environmental Science</creatorcontrib><creatorcontrib>Wakkanai Fisheries Research Institute</creatorcontrib><creatorcontrib>Hokkaido Research Organization</creatorcontrib><creatorcontrib>Field Science Center for Northern Biosphere</creatorcontrib><creatorcontrib>Hokkaido University</creatorcontrib><collection>CrossRef</collection><collection>Animal Behavior Abstracts</collection><collection>Ecology Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><jtitle>MAMMAL STUDY</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hirakawa, Yukino</au><au>Horimoto, Takanori</au><au>Suzuki, Ippei</au><au>Mitani, Yoko</au><aucorp>Graduate School of Environmental Science</aucorp><aucorp>Wakkanai Fisheries Research Institute</aucorp><aucorp>Hokkaido Research Organization</aucorp><aucorp>Field Science Center for Northern Biosphere</aucorp><aucorp>Hokkaido University</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Estimation of Sexual Maturity Based on Morphometrics of Genital Organs in Male Northern Fur Seals, Callorhinus ursinus</atitle><jtitle>MAMMAL STUDY</jtitle><date>2021-01-01</date><risdate>2021</risdate><volume>46</volume><issue>1</issue><spage>41</spage><epage>51</epage><pages>41-51</pages><issn>1343-4152</issn><issn>1348-6160</issn><eissn>1348-6160</eissn><abstract>It's not always possible to obtain samples from dead male pinnipeds that are fresh enough to determine the histological characteristics of spermatogenesis and their stage of sexual maturity. We propose that the morphometrics of genital organs of northern fur seals, Callorhinus ursinus, can be used as a new indicator of sexual maturity. We analyzed data from collected records of male fur seals around Hokkaido during 2011–2017 to examine morphometrics of genital organs and their stage in histological characteristics of spermatogenesis. First, we investigated ontogenetic and seasonal variation in three genital organs: testes, epididymides, and bacula. Second, we classified the stages of histological characteristics of spermatogenesis into three groups (Stage A–C) using non-linear discriminant analysis, based on the stage in histological characteristics of spermatogenesis determined by histological observation of seminiferous tubules. Testicular size, testicular mass, and epididymal mass showed seasonal variation associated with spermatogenesis. From our analysis, the stage in histological characteristics of spermatogenesis could be estimated using testicular mass with high accuracy of predicting spermatogenesis. And measurement of baculum was suggested to be an indicator of predicting sexual maturity. We conclude that this simple estimation may be used to determine sexual maturity based on individual growth patterns.</abstract><cop>Tokyo</cop><pub>UniBio Press</pub><doi>10.3106/ms2020-0004</doi><tpages>11</tpages></addata></record> |
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| subjects | Aquatic mammals bacula Callorhinus ursinus Discriminant analysis epididymises Growth patterns Marine mammals Maturity Morphometry Nonlinear analysis Ontogeny Organs ORIGINAL PAPERS reproduction Seals Seasonal variations Sexual maturity Spermatogenesis Testes Tubules Urogenital system |
| title | Estimation of Sexual Maturity Based on Morphometrics of Genital Organs in Male Northern Fur Seals, Callorhinus ursinus |
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