Although images of exotic tropical streams and waterfalls are commonly used to denote the beautiful and unique features associated with island landscapes, such scenic habitats are threatened in a variety of ways, according to an introductory article in the section by Gordon C. Smith, Alan P. Covich, and Anne M. D. Brasher. The ecology and potential for sustainability of such ecosystems are not well understood, and many of them are affected by human alteration of their physical and biological characteristics. Tropical island watersheds are often influenced by major fluctuations in precipitation and tend to be more "event driven" than temperate stream ecosystems. There is growing recognition of the importance of conserving the biological resources of watersheds as well as the "ecosystem services" such watersheds provide, including a clean water supply, fishery resources, and recreation.
Two articles in the BioScience special section deal with Hawaii. An article by Brasher discusses impacts of human disturbances on life in Hawaiian streams, and an article by William F. Font considers the effects of the global spread of parasites on Hawaiian Stream fishes. In the fourth article in the section, James G. March and colleagues review the far-reaching ecological effects of dams on tropical island streams and explore ways to mitigate these effects.
In the fifth article in the section, Douglas A. Craig discusses the development of running water habitats on Polynesian islands and the effects of this process on black flies. David Bass then surveys invertebrate communities on small Caribbean islands. The communities are typically sparse, and they are suffering detrimental effects resulting from human activity as well as natural disturbances. Lastly, Jonathan P. Benstead and colleagues review the freshwater biodiversity of Madagascar, which is now recognized as a global hotspot. The hotspot is threatened by deforestation, overfishing, and introductions of exotic species.
Journalists may obtain copies of the articles in the special section by contacting Donna Royston, AIBS communications representative.
BioScience publishes commentary and peer-reviewed articles covering a wide range of biological fields, including ecology. The journal has been published since 1964. AIBS is an umbrella organization for professional scientific societies and organizations that are involved with biology. It represents 86 member societies and organizations with a combined membership of about 240,000.
BioScience online: www.aibs.org/bioscienceonline