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Movements of individuals of the keystone predator Pisaster ochraceua over intertidal landscapes with varying wave exposures and prey distributions

Extracting historical population trends from photographic records of rocky shore communities

A metric for analyzing taxonomic patterns of extinction risk

Past and future carnivore extinctions: A phylogenetic perspective

A place for phyletic evolution within the theory of punctuated equilibria: Eldredge pathways

Directing research to reduce the impacts of nonindigenous species

The Nitrogen Cycle at Regional to Global Scales: Report of the International SCOPE Nitrogen Project

This issue is the final report from the International SCOPE Project on Nitrogen Transport and Transformations: A Regional and Global Analysis. SCOPE (the Scientific Committee on Problems of the Environment, ICSU) authorized the Nitrogen Project as an 8-year effort between 1994 and 2002 because of the need to better understand how humans have altered nitrogen cyc1ing globally and at the scale of large regions. Human activity has more than doubled the rate of formation of reactive nitrogen on the land surface of the earth, and the nitrogen cyc1e continues to accelerate.

Nutrient pollution of coastal rivers, bays, and seas

Nitrogen use in the United States from 1961-2000 and potential future trends

The nitrogen cycle