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Is The Dewlap An Honest Signal Of Fighting Ability In The Male Green Anole (Anolis Carolinensis)?, Alexia Hughes
Is The Dewlap An Honest Signal Of Fighting Ability In The Male Green Anole (Anolis Carolinensis)?, Alexia Hughes
Graduate Theses
Signals are morphological or behavioral traits that an individual uses to influence the behavior or actions of another. These signals can be used in male-male competition, in which male secondary sexual traits act as a signal of his fighting ability. Animal signals are considered honest when the signal reliably indicates a specific trait or condition of the individual. The genus Anolis, comprised of over 400 species that occupy the tropics and the southeastern United States, utilize aggressive signaling prior to physical combat. Research on several tropical species of anole indicates that the size of their dewlap can act as an …
Determining The Impacts Of Urbanization On Song Structure And Its Function In Territorial Defense For Gray Catbirds (Dumetella Carolinensis), Morgan L. Rhodes
Determining The Impacts Of Urbanization On Song Structure And Its Function In Territorial Defense For Gray Catbirds (Dumetella Carolinensis), Morgan L. Rhodes
Masters Theses, 2020-current
In urbanized habitats, animals are faced with novel selection pressures such as differences in community structure and increased urban noise. Urban noise pollution can negatively impact songbirds as low-frequency noise often masks portions of birds’ mating signal and reduces signal transmission. Previous research has demonstrated that songs of birds in more urban habitats have structural differences that enhance signal transmission when noise is present. These studies have focused on species that deliver short, stereotyped songs with limited repertoires. Gray catbirds (Dumetella carolinensis, family: Mimidae) sing long bouts containing imitated, improvised, and invented song elements, and therefore may have …
The Relationship Between Coat Color And Dominance In Female Sable Antelope Over Time, Taylor Wilson
The Relationship Between Coat Color And Dominance In Female Sable Antelope Over Time, Taylor Wilson
Undergraduate Honors Thesis Projects
Sable antelope (Hippotragus niger)exhibit sexual dimorphism, where males and females look different from each other in color and size. Within this difference between the sexes, there are a wide spectrum in coat colors among females, ranging from light tan to dark brown. The variations seen in female coat color in other species are known to be hormonally caused by testosterone. Testosterone levels are also related to dominance within the herd in other species. The first objective of this study is to determine if the variations in coat color are associated with the dominance hierarchy among female sable …
Effects Of Supplemental Food On The Behavior, Aggression, And Paternity Status Of Male Indigo Buntings (Passerina Cyanea), Bradley Mcleod
Effects Of Supplemental Food On The Behavior, Aggression, And Paternity Status Of Male Indigo Buntings (Passerina Cyanea), Bradley Mcleod
Online Theses and Dissertations
Breeding is an energetically costly activity for birds. If energy-limited, birds may alter their time budgets, reducing time spent in some activities and spending more time in others. To date, no experimental study has investigated the possible effect of food availability on male mate guarding behavior. Additionally, previous results from food supplementation studies are mixed. My objectives were to determine how food supplementation might influence the breeding behavior of male Indigo Buntings (Passerina cyanea). I predicted that, compared to non-supplemented males, food-supplemented males would: 1) spend less time foraging, 2) spend more time singing, 3) spend more time mate guarding, …
Interrelationships Between Testosterone, Aggression, And Parental Care Of A Temperate-Zone, Resident Songbird, The Northern Cardinal (Cardinalis Cardinalis), Margaret Susan Devries
Interrelationships Between Testosterone, Aggression, And Parental Care Of A Temperate-Zone, Resident Songbird, The Northern Cardinal (Cardinalis Cardinalis), Margaret Susan Devries
Dissertations
Interrelationships among testosterone (T), aggression, and parental care have received much investigative attention. Within birds, many studies have focused on examining such relationships using species characterized by relatively brief periods of territoriality and breeding. Few have investigated links between circulating T and reproductive behavior in birds that are year-round territorial residents and have lengthy breeding seasons, such as the Northern Cardinal (Cardinalis cardinalis). The following six chapters report and discuss findings from this dissertation’s examination of aspects of T production and potential interconnections with circulating T, aggression, and parental care in male and female cardinals. This work suggests …
Wintering White-Throated Sparrows (Zonotrichia Albicollis): Home Ranges, Aggression And Corticosterone, Marissa Ann Buschow
Wintering White-Throated Sparrows (Zonotrichia Albicollis): Home Ranges, Aggression And Corticosterone, Marissa Ann Buschow
Online Theses and Dissertations
White-throated sparrows (Zonotrichia albicollis) are songbirds that spend the non-breeding season in southeastern North America, where they form philopatric territorial flocks. Flocks exhibit dominance hierarchies, with dominance rank associated with an individual's age and prior residence in the territory. Although social behaviors within flocks are well studied, few studies have described winter home ranges. I tagged white-throated sparrows (n = 12) in Madison County, Kentucky, with 0.9-g radio transmitters during the winter of 2010-2011. Locations were entered into ArcGIS and home range sizes were estimated with 50% and 95% kernel analysis for individuals with at least five locations. Mean core …