Clinal variation in the temperature and photoperiodic control of reproductive diapause in Drosophila montana females
[Display omitted] •Photoperiodic regulation of diapause is disturbed at high temperatures.•Critical temperature, where diapause is prevented, increases towards high latitudes.•Effects of temperature are stronger in continuous darkness than in short daylength.•Critical temperature shows correlation w...
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Veröffentlicht in: | Journal of insect physiology 2023-11, Vol.150, p.104556-104556, Article 104556 |
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•Photoperiodic regulation of diapause is disturbed at high temperatures.•Critical temperature, where diapause is prevented, increases towards high latitudes.•Effects of temperature are stronger in continuous darkness than in short daylength.•Critical temperature shows correlation with the daylength inducing diapause.•Diapause is less sensitive to climate warming at high than at low latitudes.
Insect adaptation to climatic conditions at different latitudes has required changes in life-history traits linked with survival and reproduction. Several species, including Drosophila montana, show robust latitudinal variation in the critical day length (CDL), below which more than half of the emerging females enter reproductive diapause at a given temperature. Here we used a novel approach to find out whether D. montana also shows latitudinal variation in the critical temperature (CTemp), above which the photoperiodic regulation of diapause is disturbed so that the females develop ovaries in daylengths that are far below their CDL. We estimated CTemp for 53 strains from different latitudes on 3 continents after measuring their diapause proportions at a range of temperatures in 12 h daylength (for 29 of the strains also in continuous darkness). In 12 h daylength, CTemp increased towards high latitudes alongside an increase in CDL, and in 3 high-latitude strains diapause proportion exceeded 50% in all temperatures. In continuous darkness, the diapause proportion was above 50% in the lowest temperature(s) in only 9 strains, all of which came from high latitudes. In the second part of the study, we measured changes in CTemp and CDL in a selection experiment favouring reproduction in short daylength (photoperiodic selection) and by exercising selection for females that reproduce in LD12:12 at low temperature (photoperiodic and temperature selection). In both experiments selection induced parallel changes in CDL and CTemp, confirming correlations seen between these traits along latitudinal clines. Overall, our findings suggest that selection towards strong photoperiodic diapause and long CDL at high latitudes has decreased the dependency of D. montana diapause on environmental temperature. Accordingly, the prevalence and timing of the diapause of D. montana is likely to be less vulnerable to climate warming in high- than low-latitude populations. |
doi_str_mv | 10.1016/j.jinsphys.2023.104556 |
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•Photoperiodic regulation of diapause is disturbed at high temperatures.•Critical temperature, where diapause is prevented, increases towards high latitudes.•Effects of temperature are stronger in continuous darkness than in short daylength.•Critical temperature shows correlation with the daylength inducing diapause.•Diapause is less sensitive to climate warming at high than at low latitudes.
Insect adaptation to climatic conditions at different latitudes has required changes in life-history traits linked with survival and reproduction. Several species, including Drosophila montana, show robust latitudinal variation in the critical day length (CDL), below which more than half of the emerging females enter reproductive diapause at a given temperature. Here we used a novel approach to find out whether D. montana also shows latitudinal variation in the critical temperature (CTemp), above which the photoperiodic regulation of diapause is disturbed so that the females develop ovaries in daylengths that are far below their CDL. We estimated CTemp for 53 strains from different latitudes on 3 continents after measuring their diapause proportions at a range of temperatures in 12 h daylength (for 29 of the strains also in continuous darkness). In 12 h daylength, CTemp increased towards high latitudes alongside an increase in CDL, and in 3 high-latitude strains diapause proportion exceeded 50% in all temperatures. In continuous darkness, the diapause proportion was above 50% in the lowest temperature(s) in only 9 strains, all of which came from high latitudes. In the second part of the study, we measured changes in CTemp and CDL in a selection experiment favouring reproduction in short daylength (photoperiodic selection) and by exercising selection for females that reproduce in LD12:12 at low temperature (photoperiodic and temperature selection). In both experiments selection induced parallel changes in CDL and CTemp, confirming correlations seen between these traits along latitudinal clines. Overall, our findings suggest that selection towards strong photoperiodic diapause and long CDL at high latitudes has decreased the dependency of D. montana diapause on environmental temperature. Accordingly, the prevalence and timing of the diapause of D. montana is likely to be less vulnerable to climate warming in high- than low-latitude populations.</description><identifier>ISSN: 0022-1910</identifier><identifier>EISSN: 1879-1611</identifier><identifier>DOI: 10.1016/j.jinsphys.2023.104556</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>Clinal variation ; Diapause ; Photoperiodic response curve ; Selection experiment ; Temperature response curve ; Trait correlations</subject><ispartof>Journal of insect physiology, 2023-11, Vol.150, p.104556-104556, Article 104556</ispartof><rights>2023 The Authors</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c393t-f701659c9ec19a3d9c53d04a943e16fb405e589954a44b01897bcd968de80bf43</citedby><cites>FETCH-LOGICAL-c393t-f701659c9ec19a3d9c53d04a943e16fb405e589954a44b01897bcd968de80bf43</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.jinsphys.2023.104556$$EHTML$$P50$$Gelsevier$$Hfree_for_read</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Lankinen, Pekka</creatorcontrib><creatorcontrib>Kastally, Chedly</creatorcontrib><creatorcontrib>Hoikkala, Anneli</creatorcontrib><title>Clinal variation in the temperature and photoperiodic control of reproductive diapause in Drosophila montana females</title><title>Journal of insect physiology</title><description>[Display omitted]
•Photoperiodic regulation of diapause is disturbed at high temperatures.•Critical temperature, where diapause is prevented, increases towards high latitudes.•Effects of temperature are stronger in continuous darkness than in short daylength.•Critical temperature shows correlation with the daylength inducing diapause.•Diapause is less sensitive to climate warming at high than at low latitudes.
Insect adaptation to climatic conditions at different latitudes has required changes in life-history traits linked with survival and reproduction. Several species, including Drosophila montana, show robust latitudinal variation in the critical day length (CDL), below which more than half of the emerging females enter reproductive diapause at a given temperature. Here we used a novel approach to find out whether D. montana also shows latitudinal variation in the critical temperature (CTemp), above which the photoperiodic regulation of diapause is disturbed so that the females develop ovaries in daylengths that are far below their CDL. We estimated CTemp for 53 strains from different latitudes on 3 continents after measuring their diapause proportions at a range of temperatures in 12 h daylength (for 29 of the strains also in continuous darkness). In 12 h daylength, CTemp increased towards high latitudes alongside an increase in CDL, and in 3 high-latitude strains diapause proportion exceeded 50% in all temperatures. In continuous darkness, the diapause proportion was above 50% in the lowest temperature(s) in only 9 strains, all of which came from high latitudes. In the second part of the study, we measured changes in CTemp and CDL in a selection experiment favouring reproduction in short daylength (photoperiodic selection) and by exercising selection for females that reproduce in LD12:12 at low temperature (photoperiodic and temperature selection). In both experiments selection induced parallel changes in CDL and CTemp, confirming correlations seen between these traits along latitudinal clines. Overall, our findings suggest that selection towards strong photoperiodic diapause and long CDL at high latitudes has decreased the dependency of D. montana diapause on environmental temperature. Accordingly, the prevalence and timing of the diapause of D. montana is likely to be less vulnerable to climate warming in high- than low-latitude populations.</description><subject>Clinal variation</subject><subject>Diapause</subject><subject>Photoperiodic response curve</subject><subject>Selection experiment</subject><subject>Temperature response curve</subject><subject>Trait correlations</subject><issn>0022-1910</issn><issn>1879-1611</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2023</creationdate><recordtype>article</recordtype><recordid>eNqFkEtr5DAQhEVIIJPHXwg67sUTyZY81m3DJPuAwF42Z9GW2liDLTmSPJB_vxpmc86poagqqj9CHjjbcsbbx8P24Hxaxo-0rVndFFFI2V6QDe92quIt55dkw1hdV1xxdk1uUjowxmTbyQ3J-8l5mOgRooPsgqfO0zwizTgvGCGvESl4S5cx5FAUF6wz1ASfY5hoGGjEJQa7muyOSK2DBdaEp5bnGFJYRjcBnYsdPNABZ5gw3ZGrAaaE9__vLXn78fJ3_6t6_fPz9_7ptTKNanI17Mp7UhmFhitorDKysUyAEg3ydugFkyg7paQAIXrGO7XrjVVtZ7Fj_SCaW_Lt3FsWvq-Ysp5dMjhN4DGsSdedFI3YcVkXa3u2mrI6RRz0Et0M8UNzpk-Y9UF_YtYnzPqMuQS_n4NYHjk6jDoZh96gdRFN1ja4ryr-AfFHjIE</recordid><startdate>202311</startdate><enddate>202311</enddate><creator>Lankinen, Pekka</creator><creator>Kastally, Chedly</creator><creator>Hoikkala, Anneli</creator><general>Elsevier Ltd</general><scope>6I.</scope><scope>AAFTH</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>202311</creationdate><title>Clinal variation in the temperature and photoperiodic control of reproductive diapause in Drosophila montana females</title><author>Lankinen, Pekka ; Kastally, Chedly ; Hoikkala, Anneli</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c393t-f701659c9ec19a3d9c53d04a943e16fb405e589954a44b01897bcd968de80bf43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2023</creationdate><topic>Clinal variation</topic><topic>Diapause</topic><topic>Photoperiodic response curve</topic><topic>Selection experiment</topic><topic>Temperature response curve</topic><topic>Trait correlations</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Lankinen, Pekka</creatorcontrib><creatorcontrib>Kastally, Chedly</creatorcontrib><creatorcontrib>Hoikkala, Anneli</creatorcontrib><collection>ScienceDirect Open Access Titles</collection><collection>Elsevier:ScienceDirect:Open Access</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Journal of insect physiology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Lankinen, Pekka</au><au>Kastally, Chedly</au><au>Hoikkala, Anneli</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Clinal variation in the temperature and photoperiodic control of reproductive diapause in Drosophila montana females</atitle><jtitle>Journal of insect physiology</jtitle><date>2023-11</date><risdate>2023</risdate><volume>150</volume><spage>104556</spage><epage>104556</epage><pages>104556-104556</pages><artnum>104556</artnum><issn>0022-1910</issn><eissn>1879-1611</eissn><abstract>[Display omitted]
•Photoperiodic regulation of diapause is disturbed at high temperatures.•Critical temperature, where diapause is prevented, increases towards high latitudes.•Effects of temperature are stronger in continuous darkness than in short daylength.•Critical temperature shows correlation with the daylength inducing diapause.•Diapause is less sensitive to climate warming at high than at low latitudes.
Insect adaptation to climatic conditions at different latitudes has required changes in life-history traits linked with survival and reproduction. Several species, including Drosophila montana, show robust latitudinal variation in the critical day length (CDL), below which more than half of the emerging females enter reproductive diapause at a given temperature. Here we used a novel approach to find out whether D. montana also shows latitudinal variation in the critical temperature (CTemp), above which the photoperiodic regulation of diapause is disturbed so that the females develop ovaries in daylengths that are far below their CDL. We estimated CTemp for 53 strains from different latitudes on 3 continents after measuring their diapause proportions at a range of temperatures in 12 h daylength (for 29 of the strains also in continuous darkness). In 12 h daylength, CTemp increased towards high latitudes alongside an increase in CDL, and in 3 high-latitude strains diapause proportion exceeded 50% in all temperatures. In continuous darkness, the diapause proportion was above 50% in the lowest temperature(s) in only 9 strains, all of which came from high latitudes. In the second part of the study, we measured changes in CTemp and CDL in a selection experiment favouring reproduction in short daylength (photoperiodic selection) and by exercising selection for females that reproduce in LD12:12 at low temperature (photoperiodic and temperature selection). In both experiments selection induced parallel changes in CDL and CTemp, confirming correlations seen between these traits along latitudinal clines. Overall, our findings suggest that selection towards strong photoperiodic diapause and long CDL at high latitudes has decreased the dependency of D. montana diapause on environmental temperature. Accordingly, the prevalence and timing of the diapause of D. montana is likely to be less vulnerable to climate warming in high- than low-latitude populations.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.jinsphys.2023.104556</doi><tpages>1</tpages><oa>free_for_read</oa></addata></record> |
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subjects | Clinal variation Diapause Photoperiodic response curve Selection experiment Temperature response curve Trait correlations |
title | Clinal variation in the temperature and photoperiodic control of reproductive diapause in Drosophila montana females |
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