Data from 508 quadrats
(1[m.sup.2]) from eight eastern prairies, including sites in both North and South Carolina, were used in this study (Fig.
The frequency that is quadrats
of occurrence over all quadrat
studied for each species and the relative frequency was calculated using the formula
Factors that affected the variability of the data were (1) the time it took to collect data at four quadrats
each visit; (2) the distance to travel to sites, resulting in work on quadrats
in the same area (it was not possible to visit each area every year nor always in the same season); and (3) the addition of new sites as the project progressed without continuous scientific oversight, making the size of the total project unwieldy.
The first day we went to the nearby salt marsh and began our first mini-study.This involved randomly sampling areas within the salt marsh using quadrats
. Later in the evening we displayed our data in a variety of graphs.The next day we went to the River Eason and sampled from the source to the mouth of the river.
There was a strong positive correlation between the average values obtained for the quadrats
using the pugometer, roller chain and depth of pug methods (Fig.
Other seagrass monitoring programs use a transect-based sampling design that includes estimation of species coverage with quadrats
(Short et al.
Appropriate transect lines and sampling quadrats
were made based on the total area of the study site for vegetation data collection.
measuring 10 m x 10 m were placed randomly along the transect line.
In these studies, the biomass for different fishing zones was estimated using the samples obtained by scraping the rocky surface within quadrats
. Parada et al.
within the entire 200 m reach, extending across the entire width of the river for the length of the survey area.
Within the four sampling sites (Site I-IV) adjacent quadrats
of 20 m x 20 m were designated (16 quadrats
in Site I and II, 12 quadrats
in Site III and IV, see Fig.
We characterized vegetation in 10 quadrats
of 100 [m.sup.2] in each of the six previously selected study sites by using a grid over the hexagon.