Ultimate Causes and Consequences of Coloration in North American Black Widows by
نویسندگان
چکیده
Ultimate Causes and Consequences of Coloration in North American Black Widows by Nicholas C. Brandley Department of Biology Duke University Date:_______________________ Approved: ___________________________ Sönke Johnsen, Supervisor ___________________________ Stephen Nowicki ___________________________ Susan C. Alberts ___________________________ Daniel McShea ___________________________ H Frederik Nijhout An abstract of a dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Biology in the Graduate School of Duke University 2015 Copyright by Nicholas C. Brandley 2015
منابع مشابه
Aposematic signals in North American black widows are more conspicuous to predators than to prey
The iconic red hourglass of the black widow spiders (genus Latrodectus) is traditionally considered an aposematic signal, yet experimental evidence is lacking. Here, we present data that suggest that black widow coloration may have evolved to be an aposematic signal that is more conspicuous to their vertebrate predators than to their insect prey. In choice experiments with wild birds, we found ...
متن کاملAmerican Option Pricing of Future Contracts in an Effort to Investigate Trading Strategies; Evidence from North Sea Oil Exchange
In this paper, Black Scholes’s pricing model was developed to study American option on future contracts of Brent oil. The practical tests of the model show that market priced option contracts as future contracts less than what model did, which mostly represent option contracts with price rather than without price. Moreover, it suggests call option rather than put option. Using t hypothesis test...
متن کاملGloger’s rule in North American Barn Owls
Studying the geographic variation of phenotypic traits can provide key information about the potential adaptive function of alternative phenotypes. Gloger’s rule posits that animals should be darkvs. light-colored in warm and humid vs. cold and dry habitats, respectively. The rule is based on the assumption that melanin pigments and/or dark coloration confer selective advantages in warm and hum...
متن کاملOptical characteristics and mineral chemistry of colored fluorites from the mines of Mazandaran Province, and causes of their coloration
In order to understand the cause of coloration of fluorites, following experiments (UV-spectroscopy, irradiation by gamma ray and thermal bleaching) carried out on the colored and colorless fluorites from the mines of Mazandaran Province. All colored and colorless fluorites have absorption band in UV part of electromagnetic waves but deep-violet and brown fluorites have an absorption band in vi...
متن کاملThe economic consequences of widowhood for older minority women.
PURPOSE We compare the economic consequences of widowhood for pre-retirement age and early-retirement age Black, Hispanic, and non-Hispanic White women. METHODS We use the 1992 and 2000 waves of the Health and Retirement Study to assess the effects of widowhood on the household incomes and assets of non-Hispanic White, Black, and Hispanic women who were 51 years of age or older at baseline (N...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2015