Sex-specific hypothalamic-pituitary-gonadal axis sensitivity in migrating songbirds
In seasonally migratory species, the overlap between the migratory and breeding life history stages is a balance between the physiological and behavioral requirements of each stage. Previous studies investigating the degree to which songbirds prepare for breeding during spring migration have focused...
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Veröffentlicht in: | Hormones and behavior 2018-01, Vol.97, p.112-120 |
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creator | Covino, Kristen M. Jawor, Jodie M. Morris, Sara R. Moore, Frank R. |
description | In seasonally migratory species, the overlap between the migratory and breeding life history stages is a balance between the physiological and behavioral requirements of each stage. Previous studies investigating the degree to which songbirds prepare for breeding during spring migration have focused on either circulating hormone levels or direct measures of gonadal recrudescence. In this study, we evaluated the phenology of breeding preparation in a long-distance migratory songbird, the Swainson's Thrush (Catharus ustulatus), by assessing hypothalamic-pituitary-gonadal (HPG) axis sensitivity with gonadotropin-releasing hormone (GnRH) bioassays throughout the migratory period. During spring migration both males and females had a significant response to GnRH injections as reflected in elevated testosterone levels. The magnitude of response to GnRH injections, Rpotential, in females stayed consistent throughout spring migration; however, Rpotential in males increased as the migratory season progressed. It is clear that at least some degree of endocrinological breeding development occurs either before or during spring migration in both sexes, however the phenology appears to be sex specific. In males this breeding development continues at a relatively steady pace throughout the migratory period while in females, relatively little endocrine breeding development occurs during migration. These sex-specific differences in the phenology of the endocrine breeding development warrant future investigations for both male and female songbirds. Moreover, research focused on how physiological breeding development is balanced with the expression of migratory traits in long-distance songbird migrants is needed.
•Endocrinological breeding development is investigated in migrating songbirds.•Capacity to elevate testosterone, Rpotential, is determined via GnRH bioassays.•Rpotential increases throughout the migratory season in male Swainson's Thrushes.•In females Rpotential is consistent throughout the migratory period. |
doi_str_mv | 10.1016/j.yhbeh.2017.11.003 |
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•Endocrinological breeding development is investigated in migrating songbirds.•Capacity to elevate testosterone, Rpotential, is determined via GnRH bioassays.•Rpotential increases throughout the migratory season in male Swainson's Thrushes.•In females Rpotential is consistent throughout the migratory period.</description><identifier>ISSN: 0018-506X</identifier><identifier>EISSN: 1095-6867</identifier><identifier>DOI: 10.1016/j.yhbeh.2017.11.003</identifier><identifier>PMID: 29128250</identifier><language>eng</language><publisher>United States: Elsevier Inc</publisher><subject>Animal Migration - physiology ; Animals ; Breeding development ; Female ; GnRH bioassay ; Gonadotropin-Releasing Hormone - pharmacology ; HPG axis ; Hypothalamo-Hypophyseal System - drug effects ; Hypothalamo-Hypophyseal System - physiology ; Male ; Migration ; Reproduction - physiology ; Rpotential ; Seasons ; Sex Characteristics ; Songbirds - physiology ; Testosterone</subject><ispartof>Hormones and behavior, 2018-01, Vol.97, p.112-120</ispartof><rights>2017 Elsevier Inc.</rights><rights>Copyright © 2017 Elsevier Inc. All rights reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c404t-c0a8412d03b44b0d0e8c81fdcb30a98408c2869586b9cac21992932ca30566ab3</citedby><cites>FETCH-LOGICAL-c404t-c0a8412d03b44b0d0e8c81fdcb30a98408c2869586b9cac21992932ca30566ab3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0018506X17300065$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65534</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/29128250$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Covino, Kristen M.</creatorcontrib><creatorcontrib>Jawor, Jodie M.</creatorcontrib><creatorcontrib>Morris, Sara R.</creatorcontrib><creatorcontrib>Moore, Frank R.</creatorcontrib><title>Sex-specific hypothalamic-pituitary-gonadal axis sensitivity in migrating songbirds</title><title>Hormones and behavior</title><addtitle>Horm Behav</addtitle><description>In seasonally migratory species, the overlap between the migratory and breeding life history stages is a balance between the physiological and behavioral requirements of each stage. Previous studies investigating the degree to which songbirds prepare for breeding during spring migration have focused on either circulating hormone levels or direct measures of gonadal recrudescence. In this study, we evaluated the phenology of breeding preparation in a long-distance migratory songbird, the Swainson's Thrush (Catharus ustulatus), by assessing hypothalamic-pituitary-gonadal (HPG) axis sensitivity with gonadotropin-releasing hormone (GnRH) bioassays throughout the migratory period. During spring migration both males and females had a significant response to GnRH injections as reflected in elevated testosterone levels. The magnitude of response to GnRH injections, Rpotential, in females stayed consistent throughout spring migration; however, Rpotential in males increased as the migratory season progressed. It is clear that at least some degree of endocrinological breeding development occurs either before or during spring migration in both sexes, however the phenology appears to be sex specific. In males this breeding development continues at a relatively steady pace throughout the migratory period while in females, relatively little endocrine breeding development occurs during migration. These sex-specific differences in the phenology of the endocrine breeding development warrant future investigations for both male and female songbirds. Moreover, research focused on how physiological breeding development is balanced with the expression of migratory traits in long-distance songbird migrants is needed.
•Endocrinological breeding development is investigated in migrating songbirds.•Capacity to elevate testosterone, Rpotential, is determined via GnRH bioassays.•Rpotential increases throughout the migratory season in male Swainson's Thrushes.•In females Rpotential is consistent throughout the migratory period.</description><subject>Animal Migration - physiology</subject><subject>Animals</subject><subject>Breeding development</subject><subject>Female</subject><subject>GnRH bioassay</subject><subject>Gonadotropin-Releasing Hormone - pharmacology</subject><subject>HPG axis</subject><subject>Hypothalamo-Hypophyseal System - drug effects</subject><subject>Hypothalamo-Hypophyseal System - physiology</subject><subject>Male</subject><subject>Migration</subject><subject>Reproduction - physiology</subject><subject>Rpotential</subject><subject>Seasons</subject><subject>Sex Characteristics</subject><subject>Songbirds - physiology</subject><subject>Testosterone</subject><issn>0018-506X</issn><issn>1095-6867</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp9kE1LJDEQhoO46PjxCwTpo5furUqnM8nBg4i7CsIe3AVvIZ3OzNTQXyYZcf69PY563FNR8Lz1Ug9jFwgFAsqf62K7qv2q4IDzArEAKA_YDEFXuVRyfshmAKjyCuTzMTuJcT2tWAlxxI65Rq54BTP29OTf8jh6Rwty2Wo7DmllW9uRy0dKG0o2bPPl0NvGtpl9o5hF30dK9Eppm1GfdbQMNlG_zOLQL2sKTTxjPxa2jf78c56yf7_u_t7e549_fj_c3jzmToBIuQOrBPIGylqIGhrwyilcNK4uwWolQDmupK6UrLWzjqPWXJfc2RIqKW1dnrKr_d0xDC8bH5PpKDrftrb3wyYa1LIUCqWGCS33qAtDjMEvzBiom34zCGZn06zNh02zs2kQzWRzSl1-FmzqzjffmS99E3C9B_z05iv5YKIj3zvfUPAumWag_xa8A6vxh-w</recordid><startdate>201801</startdate><enddate>201801</enddate><creator>Covino, Kristen M.</creator><creator>Jawor, Jodie M.</creator><creator>Morris, Sara R.</creator><creator>Moore, Frank R.</creator><general>Elsevier Inc</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>201801</creationdate><title>Sex-specific hypothalamic-pituitary-gonadal axis sensitivity in migrating songbirds</title><author>Covino, Kristen M. ; Jawor, Jodie M. ; Morris, Sara R. ; Moore, Frank R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c404t-c0a8412d03b44b0d0e8c81fdcb30a98408c2869586b9cac21992932ca30566ab3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Animal Migration - physiology</topic><topic>Animals</topic><topic>Breeding development</topic><topic>Female</topic><topic>GnRH bioassay</topic><topic>Gonadotropin-Releasing Hormone - pharmacology</topic><topic>HPG axis</topic><topic>Hypothalamo-Hypophyseal System - drug effects</topic><topic>Hypothalamo-Hypophyseal System - physiology</topic><topic>Male</topic><topic>Migration</topic><topic>Reproduction - physiology</topic><topic>Rpotential</topic><topic>Seasons</topic><topic>Sex Characteristics</topic><topic>Songbirds - physiology</topic><topic>Testosterone</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Covino, Kristen M.</creatorcontrib><creatorcontrib>Jawor, Jodie M.</creatorcontrib><creatorcontrib>Morris, Sara R.</creatorcontrib><creatorcontrib>Moore, Frank R.</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Hormones and behavior</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Covino, Kristen M.</au><au>Jawor, Jodie M.</au><au>Morris, Sara R.</au><au>Moore, Frank R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Sex-specific hypothalamic-pituitary-gonadal axis sensitivity in migrating songbirds</atitle><jtitle>Hormones and behavior</jtitle><addtitle>Horm Behav</addtitle><date>2018-01</date><risdate>2018</risdate><volume>97</volume><spage>112</spage><epage>120</epage><pages>112-120</pages><issn>0018-506X</issn><eissn>1095-6867</eissn><abstract>In seasonally migratory species, the overlap between the migratory and breeding life history stages is a balance between the physiological and behavioral requirements of each stage. Previous studies investigating the degree to which songbirds prepare for breeding during spring migration have focused on either circulating hormone levels or direct measures of gonadal recrudescence. In this study, we evaluated the phenology of breeding preparation in a long-distance migratory songbird, the Swainson's Thrush (Catharus ustulatus), by assessing hypothalamic-pituitary-gonadal (HPG) axis sensitivity with gonadotropin-releasing hormone (GnRH) bioassays throughout the migratory period. During spring migration both males and females had a significant response to GnRH injections as reflected in elevated testosterone levels. The magnitude of response to GnRH injections, Rpotential, in females stayed consistent throughout spring migration; however, Rpotential in males increased as the migratory season progressed. It is clear that at least some degree of endocrinological breeding development occurs either before or during spring migration in both sexes, however the phenology appears to be sex specific. In males this breeding development continues at a relatively steady pace throughout the migratory period while in females, relatively little endocrine breeding development occurs during migration. These sex-specific differences in the phenology of the endocrine breeding development warrant future investigations for both male and female songbirds. Moreover, research focused on how physiological breeding development is balanced with the expression of migratory traits in long-distance songbird migrants is needed.
•Endocrinological breeding development is investigated in migrating songbirds.•Capacity to elevate testosterone, Rpotential, is determined via GnRH bioassays.•Rpotential increases throughout the migratory season in male Swainson's Thrushes.•In females Rpotential is consistent throughout the migratory period.</abstract><cop>United States</cop><pub>Elsevier Inc</pub><pmid>29128250</pmid><doi>10.1016/j.yhbeh.2017.11.003</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record> |
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subjects | Animal Migration - physiology Animals Breeding development Female GnRH bioassay Gonadotropin-Releasing Hormone - pharmacology HPG axis Hypothalamo-Hypophyseal System - drug effects Hypothalamo-Hypophyseal System - physiology Male Migration Reproduction - physiology Rpotential Seasons Sex Characteristics Songbirds - physiology Testosterone |
title | Sex-specific hypothalamic-pituitary-gonadal axis sensitivity in migrating songbirds |
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