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Title page for ETD etd-12212007-143823


Type of Document Master's Thesis
Author Niklison, Alina Maria
Author's Email Address alinanik@yahoo.com
URN etd-12212007-143823
Title INFLUENCE OF EMBRYONIC METABOLIC RATE AND INCUBATION TEMPERATURE ON INCUBATION LENGTH VARIATION IN NEOTROPICAL PASSERINES
Degree Master of Science
Department Wildlife Biology
Advisory Committee
Advisor Name Title
Thomas E. Martin Committee Chair
Arthur Woods Committee Member
Winsor Lowe Committee Member
Keywords
  • embryonic development
  • incubation
  • passerines
  • metabolic rate
  • incubation temperature
Date of Defense 2007-12-03
Availability unrestricted
Abstract
Variation in embryonic developmental periods influences fitness, but causes of interspecific variation are poorly understood. Allometry, for example, does not explain variation in incubation periods among neotropical passerines. Incubation temperature can explain some variation in developmental periods, but substantial variation remains unexplained. Here we examine two previously untested alternatives. Adult metabolic rates differ among species and similar differences among embryos may explain some variation in embryonic development rates; higher metabolism may allow faster cellular proliferation. Alternatively, metabolic rates are temperature dependent, and metabolic rates might respond differentially to temperature among species and compensate for differing incubation temperatures. These alternatives are untested across any taxa. Therefore, we examined them in tropical Venezuela by measuring embryonic metabolism at four temperatures in 15 passerine species with incubation periods ranging from 12 to 27 days. Embryonic metabolic rates responses to temperature were different among species even at constant embryonic age. Furthermore, species with lower average daily incubation temperature are less sensitive to changes in temperature than species with higher average incubation temperatures. Differences in embryonic mass specific metabolic rate among species explained a significant amount of variation in incubation periods after correcting for incubation temperature. Thus, differences in the “rate of living” as manifested through metabolism can influence developmental trajectories and deserve greater attention.
Files
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Final_Thesis_Alina_Maria_Niklison.pdf 93.38 Kb

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