Highly divergent estimates of benthic cover sponges have been reported for Caribbean mesophotic reefs (90-100 m) based on quadrat point-intercept data collection using 2 methods: visual surveys conducted in situ by technical divers, and analyses photographs taken unmanned underwater vehicles (UUVs). The second method has criticized potential errors from image distortion caused variable camera a...

Aims: This study was carried out to document wintering herbs species in the blue pine (Pinus wallichiana) forest of Kawang Gewog under Thimphu district, Bhutan. To generate baseline data on diversity and composition winter herbaceous layer forests area.
 Study Design: evaluate floral herbs, stratified random sampling used.
 Place Duration Study: The conducted district within altitudin...

Modern photographic imaging of agricultural crops can pin-point individual weeds, the patterns of which can be analyzed statistically to reveal how they are affected by variation in soil, by competition from other species and by agricultural operations. This contrasts with previous research on the patchiness of weeds that has generally used grid sampling and ignored processes operating at a fin...

We consider the problem of estimating the number of species of a biological community located in a region R divided into J quadrats. Recently, two parametric approaches have been developed which both take into account in a same modeling framework the detectability and the occurence of species in the quadrats. One developed by Dorazio and Royle (2005, J.A.S.A. 100, 389-398) ignores the unsampled...

Many ecological studies use Two-Term Local Quadrat Variance Analysis (TTLQV) and its derivatives for spatial pattern analysis. Currently, rules for determining variance peak significance are arbitrary. Variance peaks found at block size 1 and at > 50 % of the transect length are the only peaks whose use is explicitly prohibited. Although the use of variance peaks found at block sizes > 10 % of ...