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Ecology of North American freshwater fishes
The North American freshwater fish fauna is the most diverse and thoroughly researched temperate fish fauna in the world. Ecology of North American Freshwater Fishes is the only textbook to provide advanced undergraduate and graduate students and researchers with an up-to-date and integrated view of the ecological and evolutionary concepts, principles, and processes involved in the formation and maintenance of this fauna. Ecology of North American Freshwater Fishes provides readers with a broad understanding of why specific species and assemblages occur in particular places. Additionally, the text explores how individuals and species interact with each other and with their environments, how such interactions have been altered by anthropogenic impacts, and the relative success of efforts to restore damaged ecosystems. This book is designed for use in courses related to aquatic and fish ecology, fish biology, ichthyology, and related advanced ecology and conservation courses, and is divided into five sections for ease of use. Chapter summaries, supplemental reading lists, online sources, extensive figures, and color photography are included to guide readers through the material and facilitate student learning.
eBook
What Drives Racial and Ethnic Differences in High-Cost Mortgages? The Role of High-Risk Lenders
This paper examines racial and ethnic differences in high-cost mortgage lending in seven diverse metropolitan areas from 2004 to 2007. Controlling for credit score and other risk factors, AfricanAmerican and Hispanic borrowers are 103% and 78% more likely to receive high-cost mortgages for home purchases. Alarge part of the increase is attributable to sorting across lenders (55%-65%), and this, in turn, can be largely accounted for by the lender’s ex post foreclosure risk. The remaining within-lender differences are also concentrated in high-risk lenders, revealing the central role of these institutions in explaining market-wide racial and ethnic differences.
Journal Article
Place of Work and Place of Residence: Informal Hiring Networks and Labor Market Outcomes
We use a novel research design to empirically detect the effect of social interactions on labor market outcomes. Using Census data on residential and employment locations, we examine whether individuals residing in the same city block are more likely to work together than those in nearby blocks. We find evidence of significant social interactions. The estimated referral effect is stronger when individuals are similar in sociodemographic characteristics. These findings are robust across specifications intended to address sorting and reverse causation. Further, the increased availability of neighborhood referrals has a significant impact on a wide range of labor market outcomes.
Journal Article
The Gravity of Knowledge
We analyze the international operations of multinational firms to measure the spatial barriers to transferring knowledge. We model firms that can transfer bits of knowledge to their foreign affiliates in either embodied (traded intermediates) or disembodied form (direct communication). The model shows how knowledge transfer costs can be inferred from multinationals' operations. We use firm-level data on the trade and sales of US multinationals to confirm the model's predictions. Disembodied knowledge transfer costs not only make the standard multinational firm model consistent with the fact that affiliate sales fall in distance but quantitatively accounts for much of the gravity in multinational activity.
Journal Article
الإعلام والجمهور
هذا الكتاب يهدف إلى توضيح كيف أن وسائل الإعلام من الصحافة إلى التليفزيون إلى الإنترنت قد قاموا بتكوين وتمثيل الجمهوروينقسم الكتاب إلى 6 فصول ويختتم بتحديد أربع طرق يمكن من خلالها للجمهور الذي توجه إليه الآلة الإعلامية أن يشعرهم بأهميته ووزنه، وأن يجعل سلطته في الحسبان، من خلال دعوات لإبداء الاهتمام، وأشكال صناعة الحس السليم، وإحداث الرأي العام، وإيجاد الفاعلية المدنية.
BOOK
Younger generations are more interested than older generations in having non-domesticated animals as pets
The trade and private ownership of non-domesticated animals has detrimental effects on individual animals and their wild populations. Therefore, there is a need to understand the conditions that motivate and dissuade interest in non-domesticated pet ownership. Past research has demonstrated that the way in which non-domesticated animals are portrayed in images influences the public’s perception that they are suitable as pets. We conducted an online survey of people residing in the United States to investigate how viewing images that could be realistically captured in the zoo and broader tourism industries impact the degree to which people report interest in having that animal as a pet. We focused on two species, reticulated pythons ( Malayopython reticulatus ) and two-toed sloths ( Choloepus hoffmanni ), and presented each species in six different visual contexts. After viewing an image, respondents reported interest in pet ownership on a four-point Likert scale. Each species was studied separately in a between-subjects design and results were analyzed using ordinal logistic regression models. Thirty-nine percent of respondents reported interest in sloth pet ownership, and 21% reported interest in python pet ownership. However, contrary to our hypotheses, we found that viewing these species in different visual contexts did not significantly affect survey respondents’ reported interest in having either species as a pet. Generation was a significant predictor of interest in both sloth and python pet ownership, with younger generations reporting more interest in having these species as pets. Male respondents reported more interest in python pet ownership, whereas there were no significant differences between genders regarding interest in sloth ownership. We consider how modern media exposure to animals in unnatural contexts may relate to the generational effect and discuss priorities for future research to better understand the development of individual interests in non-domesticated pet ownership.
Journal Article