Elizabeth A Mittell, Priyam Mandaliya, Josephine M Pemberton, Alison Morris, Sean Morris, Susan E Johnston, Loeske E B Kruuk
{"title":"红鹿的鹿角大小:随着年龄的增长,选择减少,遗传变异增加,但衰老程度很小。","authors":"Elizabeth A Mittell, Priyam Mandaliya, Josephine M Pemberton, Alison Morris, Sean Morris, Susan E Johnston, Loeske E B Kruuk","doi":"10.1093/jeb/voae112","DOIUrl":null,"url":null,"abstract":"<p><p>While senescence is a common occurrence in wild populations, not all traits decline with age simultaneously and some do not show any senes- cence. A lack of senescence in secondary sexual traits is thought to be due to their importance for reproductive success. However, if reproduc- tive success senesces, why would secondary sexual traits apparently not senesce? Here we explored this question in a wild population of red deer (Cervus elaphus) using antler form (number of points), a secondary sexual trait which shows little senescence, despite the occurrence of reproductive senescence. In line with expectations for traits that senesce, genetic vari- ance in antler form increased with age and selection weakened with age. Therefore, there was no indication that stronger selection on individu- als that survived to older ages was countering the dilution of selection due to fewer individuals being alive. Furthermore, the effect of selec- tive disappearance masking a slight decline in antler form in the oldest years was small. Interestingly, although genetic variance and positive se- lection of antler form were found, there was no evidence of a response to selection, supporting a genetic decoupling of antler senescence and re- productive senescence. Finally, a positive genetic covariance in antler form among age classes provides a possible explanation for the the lack of senescence. These findings suggest that antler form is under a genetic constraint that prevents it from senescing, providing an interesting evolu- tionary explanation for negligible senescence in a secondary sexual trait, and consequently, the existence of asynchrony in senescence among traits within populations.</p>","PeriodicalId":50198,"journal":{"name":"Journal of Evolutionary Biology","volume":null,"pages":null},"PeriodicalIF":2.1000,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Antler size in red deer: declining selection and increasing genetic variance with age, but little senescence.\",\"authors\":\"Elizabeth A Mittell, Priyam Mandaliya, Josephine M Pemberton, Alison Morris, Sean Morris, Susan E Johnston, Loeske E B Kruuk\",\"doi\":\"10.1093/jeb/voae112\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>While senescence is a common occurrence in wild populations, not all traits decline with age simultaneously and some do not show any senes- cence. A lack of senescence in secondary sexual traits is thought to be due to their importance for reproductive success. However, if reproduc- tive success senesces, why would secondary sexual traits apparently not senesce? Here we explored this question in a wild population of red deer (Cervus elaphus) using antler form (number of points), a secondary sexual trait which shows little senescence, despite the occurrence of reproductive senescence. In line with expectations for traits that senesce, genetic vari- ance in antler form increased with age and selection weakened with age. Therefore, there was no indication that stronger selection on individu- als that survived to older ages was countering the dilution of selection due to fewer individuals being alive. Furthermore, the effect of selec- tive disappearance masking a slight decline in antler form in the oldest years was small. Interestingly, although genetic variance and positive se- lection of antler form were found, there was no evidence of a response to selection, supporting a genetic decoupling of antler senescence and re- productive senescence. Finally, a positive genetic covariance in antler form among age classes provides a possible explanation for the the lack of senescence. These findings suggest that antler form is under a genetic constraint that prevents it from senescing, providing an interesting evolu- tionary explanation for negligible senescence in a secondary sexual trait, and consequently, the existence of asynchrony in senescence among traits within populations.</p>\",\"PeriodicalId\":50198,\"journal\":{\"name\":\"Journal of Evolutionary Biology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.1000,\"publicationDate\":\"2024-09-20\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Evolutionary Biology\",\"FirstCategoryId\":\"99\",\"ListUrlMain\":\"https://doi.org/10.1093/jeb/voae112\",\"RegionNum\":3,\"RegionCategory\":\"生物学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ECOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Evolutionary Biology","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.1093/jeb/voae112","RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ECOLOGY","Score":null,"Total":0}
Antler size in red deer: declining selection and increasing genetic variance with age, but little senescence.
While senescence is a common occurrence in wild populations, not all traits decline with age simultaneously and some do not show any senes- cence. A lack of senescence in secondary sexual traits is thought to be due to their importance for reproductive success. However, if reproduc- tive success senesces, why would secondary sexual traits apparently not senesce? Here we explored this question in a wild population of red deer (Cervus elaphus) using antler form (number of points), a secondary sexual trait which shows little senescence, despite the occurrence of reproductive senescence. In line with expectations for traits that senesce, genetic vari- ance in antler form increased with age and selection weakened with age. Therefore, there was no indication that stronger selection on individu- als that survived to older ages was countering the dilution of selection due to fewer individuals being alive. Furthermore, the effect of selec- tive disappearance masking a slight decline in antler form in the oldest years was small. Interestingly, although genetic variance and positive se- lection of antler form were found, there was no evidence of a response to selection, supporting a genetic decoupling of antler senescence and re- productive senescence. Finally, a positive genetic covariance in antler form among age classes provides a possible explanation for the the lack of senescence. These findings suggest that antler form is under a genetic constraint that prevents it from senescing, providing an interesting evolu- tionary explanation for negligible senescence in a secondary sexual trait, and consequently, the existence of asynchrony in senescence among traits within populations.
期刊介绍:
It covers both micro- and macro-evolution of all types of organisms. The aim of the Journal is to integrate perspectives across molecular and microbial evolution, behaviour, genetics, ecology, life histories, development, palaeontology, systematics and morphology.