In high-diversity communities, rare species encounter one another infrequently and therefore may compete more intensely with common species or guilds for limiting space and resources. In addition, rare species may be strongly recruitment limited because of their low abundances. Under these conditions, stochastic dispersal and immigration history can have an important influence on community stru...

Diet is commonly assumed to affect the evolution of species, but few studies have directly tested its effect at macroevolutionary scales. Here we use Bayesian models of trait-dependent diversification and a comprehensive dietary database of all birds worldwide to assess speciation and extinction dynamics of avian dietary guilds (carnivores, frugivores, granivores, herbivores, insectivores, nect...

Popular texts typically assert that guilds of craftsmen `̀ monopolized’ ’ markets in medieval England. Norman Cantor’s Medieval Reader declares `̀ craft guilds’ . . . main purpose and activity was narrow regulation of industrial productivity in order to restrain competition’ ’ (Cantor 1994, p. 278). Douglass North’s Structure and Change in Economic History asserts `̀ . . . guilds organized to prot...

The prevailing paradigm of medieval manufacturing presumes guilds monopolized markets for durable goods in late-medieval England. The sources of the monopolies are said to have been the charters of towns, charters of guilds, parliamentary statutes, and judicial precedents. This essay examines those sources, demonstrates they did not give guilds legal monopolies in the modern sense of the word, ...

The effects of both abiotic factors and biotic interactions among guilds (i.e., inter-guild effects) have been suggested to be important for understanding spatial variation in species diversity; however, compared to the abiotic effects, the processes by which the inter-guild effects are mediated have been little described. Hence, we investigated stream invertebrate assemblages on Hokkaido Islan...

We studied morphological relationships within three guilds of gerbillid rodents in Israel. We found a nonrandom pattern of overdispersed means (community-wide character displacement) for upper incisor widths among the species in these three guilds. Upper tooth-row lengths, condylo-basal skull lengths, and tooth-row surfaces displayed similar patterns. We also studied seed-size selection by two ...

The objectives of this work are: (1) to define spider guilds for all extant families worldwide; (2) test if guilds defined at family level are good surrogates of species guilds; (3) compare the taxonomic and guild composition of spider assemblages from different parts of the world; (4) compare the taxonomic and functional diversity of spider assemblages and; (5) relate functional diversity with...

The spatial distribution of tree juveniles in relation to light environments may reflect species differe in growth, survival, and functional traits and will shape the nature of forest regeneration. Long-term experiments are important to evaluate this issue because of the potentially very long juvenile perio trees. Here, we combine a 10-year seedling survival–growth data with the results of comm...