Methods for biological monitoring: Biological interactions in communities of subtidal sediments

BIOLOGICAL MONITORING OF MERCURY EXPOSURE IN DENTISTS OF TEHRAN

In order to assess the risk for mercury poisoning in dentists, urine specimens were collected and analysed from 250 dentists (190 male, 60 female). Subject data and pertinent health symptoms were asked via a questionnaire. The results indicate that the mean and standard deviation of mercury values were 51.3± 38.0 µg/L, while 27.2 percent of dentists had levels within normal limits (0-19 µg/...

Canopy interactions and physical stress gradients in subtidal communities.

Species interactions are integral drivers of community structure and can change from competitive to facilitative with increasing environmental stress. In subtidal marine ecosystems, however, interactions along physical stress gradients have seldom been tested. We observed seaweed canopy interactions across depth and latitudinal gradients to test whether light and temperature stress structured i...

Monitoring , biological

Effects of microalgal communities on reflectance spectra of carbonate sediments in subtidal optically shallow marine environments

This study was conducted in subtidal areas around Lee Stocking Island, Bahamas, to investigate how microalgal biomass and community structure affect hyperspectral reflectance of sediments. Hyperspectral reflectance was measured on the surfaces of sediment cores collected from several types of carbonate sediments and habitats. Subsequently, photosynthetic and photoprotective pigments within the ...

BIoLoGICAL MonIToRInG oF WATERS

The management of natural environments passes from the possibility to know environmental features and their evolution in time. Generally quality assessment is based on chemistry or microbiology, and physical values, to justify laws and sanctions. The big problem of these precise measures, however, is in the necessity they have to be recorded in a more or less continuous monitoring. Punctual mea...