Selection for narrow gate of emergence results in correlated sex-specific changes in life history of Drosophila melanogaster
Since the ability to time rhythmic behaviours in accordance with cyclic environments is likely to confer adaptive advantage to organisms, the underlying clocks are believed to be selected for stability in timekeeping over evolutionary time scales. Here we report the results of a study aimed at asses...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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The Company of Biologists
2014-06-01
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| Series: | Biology Open |
| Subjects: | |
| Online Access: | http://bio.biologists.org/content/3/7/606 |
| _version_ | 1818677975216816128 |
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| author | Vishwanath Varma Nisha N. Kannan Vijay Kumar Sharma |
| author_facet | Vishwanath Varma Nisha N. Kannan Vijay Kumar Sharma |
| author_sort | Vishwanath Varma |
| collection | DOAJ |
| description | Since the ability to time rhythmic behaviours in accordance with cyclic environments is likely to confer adaptive advantage to organisms, the underlying clocks are believed to be selected for stability in timekeeping over evolutionary time scales. Here we report the results of a study aimed at assessing fitness consequences of a long-term laboratory selection for tighter circadian organisation using fruit fly Drosophila melanogaster populations. We selected flies emerging in a narrow window of 1 h in the morning for several generations and assayed their life history traits such as pre-adult development time, survivorship, adult lifespan and lifetime fecundity. We chose flies emerging during the selection window (in the morning) and another window (in the evening) to represent adaptive and non-adaptive phenotypes, respectively, and examined the correlation of emergence time with adult fitness traits. Adult lifespan of males from the selected populations does not differ from the controls, whereas females from the selected populations have significantly shorter lifespan and produce more eggs during their mid-life compared to the controls. Although there is no difference in the lifespan of males of the selected populations, whether they emerge in morning or evening window, morning emerging females live slightly shorter and lay more eggs during the mid-life stage compared to those emerging in the evening. Interestingly, such a time of emergence dependent difference in fitness is not seen in flies from the control populations. These results, therefore, suggest reduced lifespan and enhanced mid-life reproductive output in females selected for narrow gate of emergence, and a sex-dependent genetic correlation between the timing of emergence and key fitness traits in these populations. |
| first_indexed | 2024-12-17T09:07:54Z |
| format | Article |
| id | doaj.art-48f6d23a715d45afb9f3044b4f960af7 |
| institution | Directory Open Access Journal |
| issn | 2046-6390 |
| language | English |
| last_indexed | 2024-12-17T09:07:54Z |
| publishDate | 2014-06-01 |
| publisher | The Company of Biologists |
| record_format | Article |
| series | Biology Open |
| spelling | doaj.art-48f6d23a715d45afb9f3044b4f960af72022-12-21T21:55:23ZengThe Company of BiologistsBiology Open2046-63902014-06-013760661310.1242/bio.2014790620147906Selection for narrow gate of emergence results in correlated sex-specific changes in life history of Drosophila melanogasterVishwanath VarmaNisha N. KannanVijay Kumar SharmaSince the ability to time rhythmic behaviours in accordance with cyclic environments is likely to confer adaptive advantage to organisms, the underlying clocks are believed to be selected for stability in timekeeping over evolutionary time scales. Here we report the results of a study aimed at assessing fitness consequences of a long-term laboratory selection for tighter circadian organisation using fruit fly Drosophila melanogaster populations. We selected flies emerging in a narrow window of 1 h in the morning for several generations and assayed their life history traits such as pre-adult development time, survivorship, adult lifespan and lifetime fecundity. We chose flies emerging during the selection window (in the morning) and another window (in the evening) to represent adaptive and non-adaptive phenotypes, respectively, and examined the correlation of emergence time with adult fitness traits. Adult lifespan of males from the selected populations does not differ from the controls, whereas females from the selected populations have significantly shorter lifespan and produce more eggs during their mid-life compared to the controls. Although there is no difference in the lifespan of males of the selected populations, whether they emerge in morning or evening window, morning emerging females live slightly shorter and lay more eggs during the mid-life stage compared to those emerging in the evening. Interestingly, such a time of emergence dependent difference in fitness is not seen in flies from the control populations. These results, therefore, suggest reduced lifespan and enhanced mid-life reproductive output in females selected for narrow gate of emergence, and a sex-dependent genetic correlation between the timing of emergence and key fitness traits in these populations.http://bio.biologists.org/content/3/7/606CircadianDrosophilaPrecisionSelectionDevelopment timeLifespanFecundity |
| spellingShingle | Vishwanath Varma Nisha N. Kannan Vijay Kumar Sharma Selection for narrow gate of emergence results in correlated sex-specific changes in life history of Drosophila melanogaster Biology Open Circadian Drosophila Precision Selection Development time Lifespan Fecundity |
| title | Selection for narrow gate of emergence results in correlated sex-specific changes in life history of Drosophila melanogaster |
| title_full | Selection for narrow gate of emergence results in correlated sex-specific changes in life history of Drosophila melanogaster |
| title_fullStr | Selection for narrow gate of emergence results in correlated sex-specific changes in life history of Drosophila melanogaster |
| title_full_unstemmed | Selection for narrow gate of emergence results in correlated sex-specific changes in life history of Drosophila melanogaster |
| title_short | Selection for narrow gate of emergence results in correlated sex-specific changes in life history of Drosophila melanogaster |
| title_sort | selection for narrow gate of emergence results in correlated sex specific changes in life history of drosophila melanogaster |
| topic | Circadian Drosophila Precision Selection Development time Lifespan Fecundity |
| url | http://bio.biologists.org/content/3/7/606 |
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