find that subjective measures tend to underreport water clarity compared to objective measures (such as Secchi disk
TABLE 1 Minimum, averages [+ or -] Standard Deviation, and maximum values of abiotic variables, trophic state indices, and total biomass at the three collection points in the euphotic (*) and aphotic (**) zones of the Argemiro de Figueiredo reservoir (Brazil) from August/2007 to July/2009 Confluence of the tributaries rivers (PC) Min Mean [+ or -] SD Max Secchi disk
Zooplankton ornekleri golden secilen 5 istasyondan aylik olarak uc tekerrurlu alinmis ve istasyonlarda ornekleme sirasinda su sicakligi, cozunmus oksijen, pH, Secchi disk
derinligi, elektrik iletkenligi ve su derinligi olculmustur.
Development of an empirical model for chlorophyll-a and Secchi Disk
Depth estimation for a Pampean shallow lake (Argentina).
The turbidity levels are determined by the Secchi disk
depth (The Secchi disk
depth provides a method for assessing turbidity.
Prediction of the light attenuation coefficient through the Secchi disk
depth: empirical modeling in two large Neotropical ecosystems.
Water clarity was determined with the help of Secchi disk
and turbidity with turbidity meter (Orion, AQ-4500).
I lowered my black-and-white secchi disk
into Florida Bay.
According to the OECD (1982) system, the lake was considered hypereutrophic when including the Secchi disk
values (Table 2).
1 gasoline-water mud pump arnomis- 1 2 batteries from 150 Ah to 200 - 2 3 Centrifuges - 1 Mobile Laminar 4 - 1 5 of moisture, temperature and pressure (0-100 hPa) probes - 1 of 6 rabble - extractors with accessories - 1 7 Electric range - 1 of 8 Triple filtration system with a vacuum pump - 1 9 Single filtration system with a vacuum pump - 1 10 Secchi disk
- 1 of 11 samples drying unit (with the weighing function) - 1 12 Air conditioning - 1 3 public lots.
Water transparency was observed at 0900 h daily using a Secchi disk
depth (Secchi), water surface temperature (Temp), dissolved oxygen (DO) content, and pH were measured in situ, the rest of the chemical analyses were performed at Tartu laboratory of the Estonian Environmental Research Centre.