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Evolutionary Genetics Of Juvenile Hormone And Ecdysteroid Regulation In Gryllus: A Case Study In The Microevolution Of Endocrine Regulation, Anthony J. Zera
Evolutionary Genetics Of Juvenile Hormone And Ecdysteroid Regulation In Gryllus: A Case Study In The Microevolution Of Endocrine Regulation, Anthony J. Zera
Anthony Zera Publications
During the past 15 years the first detailed synthesis of endocrinology and population genetics has begun, in which natural genetic variations for endocrine regulators have been characterized, almost exclusively in species of the cricket genus Gryllus. Artificial selection studies have documented that regulators of the juvenile hormone titer can rapidly evolve and exhibit levels of genetic variability similar to other physiological traits. Strong genetic correlations exist between some but not all regulators of the JH titer during the juvenile stage. No genetic correlation exists between regulators functioning in juvenile and adult stages, and thus, endocrine regulation can evolve independently in …
Intermediary Metabolism And Life-History Trade-Offs: Differential Metabolism Of Amino Acids Underlies The Dispersal-Reproduction Trade-Off In A Wing-Polymorphic Cricket, Anthony J. Zera, Zhangwu Zhao
Intermediary Metabolism And Life-History Trade-Offs: Differential Metabolism Of Amino Acids Underlies The Dispersal-Reproduction Trade-Off In A Wing-Polymorphic Cricket, Anthony J. Zera, Zhangwu Zhao
Anthony Zera Publications
Although the differential flow of metabolites through alternate pathways of intermediary metabolism is thought to be an important functional cause of life-history trade-offs, this phenomenon remains understudied. Using a radiolabeled amino acid, we quantified genetic differences in in vivo amino acid metabolism between morphs of the wing-polymorphic cricket Gryllus firmus that trade off early-age reproduction and dispersal capability. Lines selected for the flight-capable morph, which delays reproduction, oxidized a greater proportion of radiolabeled glycine and converted a greater amount into somatic lipid, mainly triglyceride (flight fuel). By contrast, lines selected for the flightless, reproductive morph converted a substantially greater proportion …
Biochemical Basis Of Specialization For Dispersal Vs. Reproduction In A Wing-Polymorphic Cricket: Morph-Specific Metabolism Of Amino Acids, Zhangwu Zhao, Anthony J. Zera
Biochemical Basis Of Specialization For Dispersal Vs. Reproduction In A Wing-Polymorphic Cricket: Morph-Specific Metabolism Of Amino Acids, Zhangwu Zhao, Anthony J. Zera
Anthony Zera Publications
The biochemical basis of specializations for dispersal vs. reproduction is an understudied aspect of dispersal polymorphism in insects. Using a radiolabelled amino acid, we quantified differences in in vivo amino acid metabolism between morphs of the wing-polymorphic cricket, Gryllus firmus, that trade-off early age reproduction and dispersal capability. Studies were conducted in crickets fed a variety of diets expected to influence amino acid and lipid metabolism. On the day of molt to adulthood, prior to the morph-specific trade-off between ovarian growth and biochemical preparation for flight (e.g. biosynthesis of triglyceride flight fuel), morphs did not differ in any aspect of …