Zobrazeno 1 - 10
of 16
pro vyhledávání: '"James A. Brown"'
Autor:
Richard M. Sibly, Patrick R. Stephens, S. Kathleen Lyons, Alison G. Boyer, Mikael Fortelius, Jordan G. Okie, John L. Gittleman, Tamar Dayan, James H. Brown, Alistair R. Evans, Mark D. Uhen, Marcus J. Hamilton, Larisa E. Harding, Jessica M. Theodor, S. K. Morgan Ernest, Daniel P. Costa, Christy M. McCain, Kari Lintulaakso, Felisa A. Smith, Juha Saarinen
Publikováno v:
Science. 330:1216-1219
How Mammals Grew in Size Mammals diversified greatly after the end-Cretaceous extinction, which eliminated the dominant land animals (dinosaurs). Smith et al. (p. 1216 ) examined how the maximum size of mammals increased during their radiation in eac
Publikováno v:
Science. 297:1545-1548
The latitudinal gradient of increasing biodiversity from poles to equator is one of the most prominent but least understood features of life on Earth. Here we show that species diversity can be predicted from the biochemical kinetics of metabolism. W
Autor:
James H. Brown, S. K. Morgan Ernest
Publikováno v:
Science. 292:101-104
Because individual species can play key roles, the loss of species through extinction or their gain through colonization can cause major changes in ecosystems. For almost 20 years after kangaroo rats were experimentally removed from a Chihuahuan dese
Autor:
H. Henry Janzen, James R. Brown, Peter Grace, Keith Goulding, Martin Körschens, P. E. Rasmussen
Publikováno v:
Science. 282:893-896
Long-term agroecosystem experiments can be defined as large-scale field experiments more than 20 years old that study crop production, nutrient cycling, and environmental impacts of agriculture. They provide a resource for evaluating biological, biog
Autor:
James H. Brown, Stuart L. Pimm
Publikováno v:
Science. 304:831-833
Theories abound as to why the tropics harbor such amazing biodiversity compared to higher latitudes. In their Perspective, Pimm and Brown discuss the pros and cons of three popular hypotheses.
Publikováno v:
Science. 270:2012-2014
Microevolutionary changes in the body size of the bushy-tailed woodrat (Neotoma cinerea) since the last glacial maximum were estimated from measurements of fecal pellets preserved in paleomiddens from the Great Basin and Colorado Plateau of the Unite
Autor:
James H. Brown, Edward J. Heske
Publikováno v:
Science. 250:1705-1707
Twelve years after three species of kangaroo rats (Dipodomys spp.) were removed from plots of Chihuahuan Desert shrub habitat, density of tall perennial and annual grasses had increased approximately threefold and rodent species typical of arid grass
Autor:
James Robert Brown
Publikováno v:
Science. 290:1701-1702
Teaching and research at universities is increasingly funded from private sources. In this essay, Brown highlights the problems associated with this approach and calls for a return to largely public funding. He argues that the public, rather than cor
Autor:
William H. Woodruff, Geoffrey B. West, Chen Hou, Wenyun Zuo, Melanie E. Moses, James H. Brown
Publikováno v:
Science. 325:1206-1206
Our extended ontogenetic growth model is a theoretical model based on conservation of energy and general biological mechanisms underlying ontogenetic growth. We do not believe that the comments of Makarieva et al . and Sousa et al . expose substantiv
Publikováno v:
Science. 299:346-346
Contrary to the critique by Storch ([1][1]), the model that we presented ([2][2]) was not intended to be a comprehensive theory that could account for all patterns and processes of species diversity. It was intended to show that species richness in m