Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1002/ece3.2838 |
The evolution of different maternal investment strategies in two closely related desert vertebrates | |
Ennen, Joshua R.1; Lovich, Jeffrey E.2; Averill-Murray, Roy C.3; Yackulic, Charles B.2; Agha, Mickey4; Loughran, Caleb5; Tennant, Laura2; Sinervo, Barry6 | |
通讯作者 | Ennen, Joshua R. |
来源期刊 | ECOLOGY AND EVOLUTION |
ISSN | 2045-7758 |
出版年 | 2017 |
卷号 | 7期号:9页码:3177-3189 |
英文摘要 | We compared egg size phenotypes and tested several predictions from the optimal egg size (OES) and bet-hedging theories in two North American desert-dwelling sister tortoise taxa, Gopherus agassizii and G. morafkai, that inhabit different climate spaces: relatively unpredictable and more predictable climate spaces, respectively. Observed patterns in both species differed from the predictions of OES in several ways. Mean egg size increased with maternal body size in both species. Mean egg size was inversely related to clutch order in G. agassizii, a strategy more consistent with the within-generation hypothesis arising out of bet-hedging theory or a constraint in egg investment due to resource availability, and contrary to theories of density dependence, which posit that increasing hatchling competition from later season clutches should drive selection for larger eggs. We provide empirical evidence that one species, G. agassizii, employs a bet-hedging strategy that is a combination of two different bet-hedging hypotheses. Additionally, we found some evidence for G. morafkai employing a conservative bet-hedging strategy. (e.g., lack of intra- and interclutch variation in egg size relative to body size). Our novel adaptive hypothesis suggests the possibility that natural selection favors smaller offspring in late-season clutches because they experience a more benign environment or less energetically challenging environmental conditions (i.e., winter) than early clutch progeny, that emerge under harsher and more energetically challenging environmental conditions (i.e., summer). We also discuss alternative hypotheses of sexually antagonistic selection, which arise from the trade-offs of son versus daughter production that might have different optima depending on clutch order and variation in temperature-dependent sex determination (TSD) among clutches. Resolution of these hypotheses will require long-term data on fitness of sons versus daughters as a function of incubation environment, data as yet unavailable for any species with TSD. |
英文关键词 | benign environment hypothesis bet-hedging environmental predictability offspring fitness optimal egg size phenotypic diversification reproductive trade-off sexually antagonistic selection tortoise |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000402548900030 |
WOS关键词 | DEPENDENT SEX DETERMINATION ; TORTOISES GOPHERUS-AGASSIZII ; OPTIMAL EGG SIZE ; NATURAL-SELECTION ; OFFSPRING SIZE ; BODY-SIZE ; REPRODUCTIVE ECOLOGY ; CLUTCH SIZE ; TRADE-OFF ; ENVIRONMENTAL UNCERTAINTY |
WOS类目 | Ecology ; Evolutionary Biology |
WOS研究方向 | Environmental Sciences & Ecology ; Evolutionary Biology |
来源机构 | United States Geological Survey ; University of California, Davis |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/198495 |
作者单位 | 1.Tennessee Aquarium Conservat Inst, 175 Baylor Sch Rd, Chattanooga, TN 37405 USA; 2.US Geol Survey, Southwest Biol Sci Ctr, Flagstaff, AZ 86001 USA; 3.Arizona Game & Fish Dept, Nongame Branch, Phoenix, AZ USA; 4.Univ Calif Davis, Dept Wildlife Fish & Conservat Biol, Davis, CA 95616 USA; 5.Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA; 6.Univ Calif Santa Cruz, Dept Ecol & Evolutionary Biol, Santa Cruz, CA 95064 USA |
推荐引用方式 GB/T 7714 | Ennen, Joshua R.,Lovich, Jeffrey E.,Averill-Murray, Roy C.,et al. The evolution of different maternal investment strategies in two closely related desert vertebrates[J]. United States Geological Survey, University of California, Davis,2017,7(9):3177-3189. |
APA | Ennen, Joshua R..,Lovich, Jeffrey E..,Averill-Murray, Roy C..,Yackulic, Charles B..,Agha, Mickey.,...&Sinervo, Barry.(2017).The evolution of different maternal investment strategies in two closely related desert vertebrates.ECOLOGY AND EVOLUTION,7(9),3177-3189. |
MLA | Ennen, Joshua R.,et al."The evolution of different maternal investment strategies in two closely related desert vertebrates".ECOLOGY AND EVOLUTION 7.9(2017):3177-3189. |
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