quadrat sampling

quadrat sampling

(in statistics) a method of examining the distribution of organisms by taking samples within squares of known size, normally 1 m2. Such squares are selected at random and marked usually with wire outlines. A series of quadrats is usually sampled so that comparisons are possible between, say, the distribution of a given plant in two different areas. The mean number in each series of quadrats can be compared. see SIGNIFICANCE.
References in periodicals archive ?
A comparison of the effectiveness of timed searches vs quadrat sampling in mussel surveys.
Modern occurrence of and size data for Quadrula aurea (Mollusca: Unionidae) from the Medina River of Texas
Mussels were collected during timed searches and quadrat sampling.
The distribution and abundance of mussels (Bivalvia: Unionidae) in lower Big Walnut Creek from Hoover Dam to its mouth, in Franklin and Pickaway Counties, Ohio
In April 2014 to March 2015, quadrat sampling by divers, experimental fishing surveys, and retrieval of clams detached from the fishing gear were conducted monthly.
Ecology of the razor clam Solen gordonis and fishery impact on the population in Sasebo Bay, Kyushu, Japan
There is only one study comparing sampling methods in caves (WEINSTEIN; SLANEY, 1995) and, in this case, the quadrat sampling method has not been assessed.
Effectiveness of quadrat sampling on terrestrial cave fauna survey a case study in a Neotropical cave/A eficacia do metodo de amostragem por quadrados em levantamentos da fauna terrestre cavernicola--um estudo de caso em uma caverna Neotropical
To estimate the density and dispersion patterns of Inflated Heelsplitters and other unionid mussels in the Amite River, we used quantitative quadrat sampling modified after Strayer and Smith (2003).
The population ecology of the threatened inflated Heelsplitter, Potamilus inflatus, in the Amite River, Louisiana
Springs, New Braunfels, Texas, by quadrat sampling at 10 in intervals from the spring head to Landa Lake in Fall.
Relationship between stream velocity & depth and snail size distribution & density of the balcones elimia, elimia comalensis (pilsbry, 1890) (gastropoda: pleuroceridae) in comal springs, texas
This quantitative survey employed a quadrat sampling technique with multiple random starts.
Species diversity and population densities of unionid mussels in the Maple River
The methods of estimating grasshopper numbers vary from state to state and include quadrat sampling, ring estimations, binomial sampling, pan trapping, roadside counts, and transect or visual estimation (Legg et al.
Sweep sampling capture rates for rangeland grasshoppers (Orthoptera: Acrididae) vary during morning hours
Thus, the quadrat sampling method produced adequate estimates of the actual seed density oc curring at each point.
FACTORS SHAPING THE SEEDFALL PATTERN OF A BIRD-DISPERSED PLANT
Samples of 45 colonies each from the NKB, SKB, KBO, and HAW populations were collected following a nested quadrat sampling design modified from Greig Smith (1979).
Genotypic variation and clonal structure in coral populations with different disturbance histories
Different techniques have been used to assess diversity and abundance of stream and spring salamanders, including dip netting (Nowakowski and Maerz, 2009), quadrat sampling (Jung et al.
Time of day does not affect detection in visual-encounter surveys of a spring-dwelling salamander, Eurycea naufragia
This quantitative survey employed two types of quadrat sampling techniques.
The mussel fauna of North Dakota rivers
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