Testing bioassessment metrics: macroinvertebrate, sculpin, and salmonid responses to stream habitat, sediment, and metals.

The purpose of this article is to report on the testing of responses of multimetric macroinvertebrate and habitat indices to common disturbances to streams: stream habitat alteration, excessive sediment, and elevated metals concentrations. Seven macroinvertebrate community metrics were combined into a macroinvertebrate biotic index (MBI), and 11 channel morphology, riparian, and substrate features were combined into a habitat index. Indices were evaluated by comparing the habitat results to fish population surveys and comparing the macroinvertebrate results to habitat ratings, percent fine sediments measured by Wolman pebble counts, and copper concentrations. Macroinvertebrate scores decreased with increasing percentages of fine sediments measured either across the bankfull or instream channel widths. Macroinvertebrate scores decreased with increasing copper. One metric, richness of Ephemeroptera, Plecoptera, and Trichoptera (EPT) taxa, was more responsive to both copper and sediment than was the multimetric MBI. Habitat scores corresponded well with the age class structure of salmonids, but not with that of benthic sculpins. Both salmonid and sculpin age classes declined with increasing percentages of fine sediments. The decline was graded with the sculpin age classes, whether fine sediments were measured across the instream or bankfull channel, whereas salmonids consistently responded only to the instream fine sediments.

Current status of prostate cancer in North American black males.

The National Cancer Institute's Surveillance, Epidemiology, and End Results (SEER) program is used to examine the most recent data available to draw inferences about black and white males in the United States with prostate cancer. Findings include a continuing rise in the incidence of prostate cancer which, as of 1985 SEER data, is 50% higher in the black male population than in white males. With the exception of minor fluctuations over the last 17 years, the mortality rate for black males demonstrates an upward trend. Combining all stages and ages, the survival rate for black males is 10% poorer than for white males. These data provide a glimpse into the problem of prostatic carcinoma in the United States today. To develop preventive strategies and cancer control interventions, a fuller understanding of the nature of the disease and its biologic course is necessary. Epidemiologic questions concerning socioeconomic status among and within racial groups, lifestyles, and behaviors that affect health seeking and diagnosis and treatment of prostatic cancer must be answered. By examining SEER data for prostatic cancer, we update the current status of this disease in North American blacks and infer possible directions for future epidemiologic surveys and cancer control intervention research.