Browsing FAS Scholarly Articles by Keyword "diversification"
Now showing items 1-11 of 11
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The abiotic and biotic drivers of rapid diversification in Andean bellflowers (Campanulaceae)
(John Wiley and Sons Inc., 2016)Summary The tropical Andes of South America, the world's richest biodiversity hotspot, are home to many rapid radiations. While geological, climatic, and ecological processes collectively explain such radiations, their ... -
Adaptive Radiation: Contrasting Theory with Data
(American Association for the Advancement of Science, 2009)Biologists have long been fascinated by the exceptionally high diversity displayed by some evolutionary groups. Adaptive radiation in such clades is not only spectacular, but is also an extremely complex process influenced ... -
Bacterial gut symbionts are tightly linked with the evolution of herbivory in ants
(Proceedings of the National Academy of Sciences, 2009)Ants are a dominant feature of terrestrial ecosystems, yet we know little about the forces that drive their evolution. Recent findings illustrate that their diets range from herbivorous to predaceous, with “herbivores” ... -
The establishment of Central American migratory corridors and the biogeographic origins of seasonally dry tropical forests in Mexico
(Frontiers Media S.A., 2014)Biogeography and community ecology can mutually illuminate the formation of a regional species pool or biome. Here, we apply phylogenetic methods to a large and diverse plant clade, Malpighiaceae, to characterize the ... -
Fight or Flight? Portfolio Rebalancing by Individual Investors
(MIT Press, 2009)This paper investigates the dynamics of individual portfolios in a unique dataset containing the disaggregated wealth of all households in Sweden. Between 1999 and 2002, we observe little aggregate rebalancing in the ... -
Getting Better or Feeling Better? How Equity Investors Respond to Investment Experience
(National Bureau of Economic Research, 2014)Using a large representative sample of Indian retail equity investors, many of them new to the stock market, we show that both years of investment experience and feedback from investment returns have significant effects ... -
Have Individual Stocks Become More Volatile? An Empirical Exploration of Idiosyncratic Risk
(Blackwell Publishing, 2001)This paper uses a disaggregated approach to study the volatility of common stocks at the market, industry, and firm levels. Over the period from 1962 to 1997 there has been a noticeable increase in firm-level volatility ... -
Portfolio Diversification under Local and Moderate Deviations from Power Laws.
(Elsevier, 2008)This paper analyzes portfolio diversification for nonlinear transformations of heavy-tailed risks. It is shown that diversification of a portfolio of convex functions of heavy-tailed risks increases the portfolio’s riskiness ... -
Primate Extinction Risk and Historical Patterns of Speciation and Extinction in Relation to Body Mass
(Royal Society of London, 2011)Body mass is thought to influence diversification rates, but previous studies have produced ambiguous results. We investigated patterns of diversification across 100 trees obtained from a new Bayesian inference of primate ... -
Sexual Dimorphism and Adaptive Radiation in Anolis Lizards
(Nature Publishing Group, 2007)Sexual dimorphism is widespread and substantial throughout the animal world. It is surprising, then, that such a pervasive source of biological diversity has not been integrated into studies of adaptive radiation, despite ... -
Shared and Unique Features of Diversification in Greater Antillean Anolis Ecomorphs
(Blackwell Publishing, 2006)Examples of convergent evolution suggest that natural selection can often produce predictable evolutionary outcomes. However, unique histories among species can lead to divergent evolution regardless of their shared selective ...