Question: Previous interpretations of the variance plot of paired quadrat variance method (PQV) have been incomplete. The objective of this study was to clarify the interpretation of PQV, and to shed additional light on how different quadrat variance methods can be used, in concert, to measure scale in transect data. Methods: We used artificial and real data to examine how the PQV method elucid...

Three techniques, namely a ladle, a metal quadrat and a D-shaped aquatic net, were used for comparison to sample immature stages of mosquitoes in woodland pools in northern England. The quadrat proved to be more reliable in giving a more accurate representation of the different instar proportions in the ponds than the ladle and aquatic net. The ladle showed bias of undersampling the earlier ins...

Quadrat-based analysis of two rainforest plots of area 50 ha, one in Panama (Barro Colorado Island, BCI) and the other in Malaysia (Pasoh), shows that in both plots recruitment is in general negatively correlated with both numbers and biomass of adult trees of the same species in the same quadrat. At BCI, this effect is not significantly influenced by treefall gaps. In both plots, recruitment o...

An unmanaged pasture was sampled on four occasions (A, B, C, D) with five different quadrat sizes for Criconemella sphaerocephalus by removing a constant soil core volume of 75 cm(3) (A) and 300 cm(3) (C) from increasing quadrat areas of 0.5-8 m(2), and removing soil core volumes of increasing size - 75-1,200 cm(3) (B) and 300-4,800 cm(3) (D) - proportionally with an increase in quadrat area (0...

OBJECTIVE To test a survey method for estimating the coverage of selective feeding programmes in humanitarian emergencies. METHODS The trial survey used a stratified design with strata that were defined using the centric systematic area sample method. Thirty 100 km2 quadrats were sampled. The communities located closest to the centre of each quadrat were sampled using a case-finding approach....