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For animals that experience annual cycles of gonad development, the seasonal timing (phenology) of gonad growth is a major adaptation to local environmental conditions. To optimally time seasonal gonad growth, animals use environmental cues that forecast future conditions. The availability of food is one such environmental cue. Although the importance

For animals that experience annual cycles of gonad development, the seasonal timing (phenology) of gonad growth is a major adaptation to local environmental conditions. To optimally time seasonal gonad growth, animals use environmental cues that forecast future conditions. The availability of food is one such environmental cue. Although the importance of food availability has been appreciated for decades, the physiological mechanisms underlying the modulation of seasonal gonad growth by this environmental factor remain poorly understood.

Urbanization is characterized by profound environmental changes, and urban animals must adjust to an environment vastly different from that of their non-urban conspecifics. Evidence suggests that birds adjust to urban areas by advancing the timing of seasonal breeding and gonad development, compared to their non-urban conspecifics. A leading hypothesis to account for this phenomenon is that food availability is elevated in urban areas, which improves the energetic status of urban birds and enables them to initiate gonad development earlier than their non-urban conspecifics. However, this hypothesis remains largely untested.

My dissertation dovetailed comparative studies and experimental approaches conducted in field and captive settings to examine the physiological mechanisms by which food availability modulates gonad growth and to investigate whether elevated food availability in urban areas advances the phenology of gonad growth in urban birds. My captive study demonstrated that energetic status modulates reproductive hormone secretion, but not gonad growth. By contrast, free-ranging urban and non-urban birds did not differ in energetic status or plasma levels of reproductive hormones either in years in which urban birds had advanced phenology of gonad growth or in a year that had no habitat-related disparity in seasonal gonad growth. Therefore, my dissertation provides no support for the hypothesis that urban birds begin seasonal gonad growth because they are in better energetic status and increase the secretion of reproductive hormones earlier than non-urban birds. My studies do suggest, however, that the phenology of key food items and the endocrine responsiveness of the reproductive system may contribute to habitat-related disparities in the phenology of gonad growth.
ContributorsDavies, Scott (Author) / Deviche, Pierre (Thesis advisor) / Sweazea, Karen (Committee member) / McGraw, Kevin (Committee member) / Orchinik, Miles (Committee member) / Warren, Paige (Committee member) / Arizona State University (Publisher)
Created2014
Open Educational Resources from 2020 March Mammal Madness Tournament
Description

This packet includes:

2020 Bracket Common Name

2020 Bracket Latin Binomial

Pre-Tournament Research Lesson Plan (English)

Tournament Lesson Plan & Worksheets (English)

Visual Arts Lesson Plan (English)

Language Arts Lesson Plan (English)

2020 Bracket Common Name (Spanish)

Pre-Tournament Research Lesson Plan (Spanish)

Tournament Lesson Plan & Worksheets (Spanish)

ContributorsHinde, Katie (Author) / Schuttler, Stephanie (Author) / Henning, Charon (Illustrator) / Nuñez-de la Mora, Alejandra (Translator)
Created2020
2019 March Mammal Madness Educator Materials
Description

This packet includes:

2019 Bracket

Pre-Tournament Research Lesson Plan (English)

Tournament Lesson Plan & Worksheets (English)

ContributorsHinde, Katie (Author) / Schuttler, Stephanie (Author) / Henning, Charon (Illustrator)
Created2019
2021 March Mammal Madness Educational Materials
Description

This packet includes:

 2021 Bracket Common Name 

2021 Bracket Latin Binomial 

Bracket FAQ (English) 

Pre-Tournament Research Lesson Plan (English) 

Tournament Lesson Plan & Worksheets (English) 

Visual Arts Lesson Plan (English) 

Language Arts Lesson Plan (English) 

Guide for Youngest Players (English)

JUMBO Bracket for Youngest Players (English)

2021 Bracket Common Name (Spanish) 

Pre-Tournament Research Lesson Plan (Spanish) 

Tournament Lesson Plan & Worksheets (Spanish) 

Visual

This packet includes:

 2021 Bracket Common Name 

2021 Bracket Latin Binomial 

Bracket FAQ (English) 

Pre-Tournament Research Lesson Plan (English) 

Tournament Lesson Plan & Worksheets (English) 

Visual Arts Lesson Plan (English) 

Language Arts Lesson Plan (English) 

Guide for Youngest Players (English)

JUMBO Bracket for Youngest Players (English)

2021 Bracket Common Name (Spanish) 

Pre-Tournament Research Lesson Plan (Spanish) 

Tournament Lesson Plan & Worksheets (Spanish) 

Visual Arts Lesson Plan (Spanish)

Language Arts Lesson Plan (Spanish) 

JUMBO Bracket for Youngest Players (Spanish) 

ContributorsHinde, Katie (Author) / Schuttler, Stephanie (Author) / Henning, Charon (Illustrator) / Nuñez-de la Mora, Alejandra (Translator) / Kissel, Jenna (Author) / Nickley, William (Artist)
Created2021-02