Line transect sampling
Kernel Estimation in Line Transect Sampling for Parametric Model
... Line transect sampling is a common method used in ecology for sampling the sample required. It is an important procedure for estimating the population density of objects in interested study ...
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Some Improvements in Kernel Estimation Using Line Transect Sampling
... Kernel estimation provides a nonparametric estimate of the probability density function from which a set of data is drawn. This article proposes a method to choose a reference density in bandwidth calculation for kernel ...
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Line transect sampling of primates : can animal to observer distance methods work?
... Line Transect Sampling of Primates: Can Animal-to-Observer Distance Methods Work? Stephen ...Abstract Line transect sampling is widely used for estimating abundance of primate ...
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An Adaptation of Kernel Density Estimation for Population Abundance using Line Transect Sampling When the Shoulder Condition is Violated
... Abstract: Kernel estimation is a commonly used method to estimate the population density in line transect sampling. In general, the classical kernel estimator of f X (0) , which is the probability ...
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Assessing the effects of measurement errors in line transect sampling
... A simulation study was carried out in which known amount of measurement error can be added to error-free line transect data (i.e. true perpendicular distances) to determine the effects o[r] ...
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Size bias in line transect sampling: A field test
... In Figure 1 the estimated probability of sighting is plotted against perpendicular distance for transect 1 for each group size separatelY'.. 2.2 The Bxponential Power Sighting Function.[r] ...
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Line transect sampling of primates : can animal-to-observer distance methods work?
... the transect to the animal first sighted and the mean, maximum and reliable distance from the observer to the ...the transect or at a steep angle to it, are likely to cause ...
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Modeling visibility bias using mark-recapture and line transect sampling methodology: An application to wildlife bioassessment of species with prominent nesting structures
... of the estimators, for a population of size N = 500 the RMSE of the if Sa is generally smaller than that of the NCHa' However, when all the nests on the lists are active (PIa = 1.0), and[r] ...
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Line Transect Methods for Plant Surveys
... below, may be used, so that the cv is estimated from the between-segment sample variance. This method may also be used to estimate cv ( n E ) . The nonparametric bootstrap provides a simple yet robust method of ...
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Design and analysis of line transect surveys for primates
... In the simulation study, we selected the model chosen by AIC, yet despite obvious overfitting in some cases, estimation was still good. Upward bias in line transect sampling can occur from a source ...
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The effect of animal movement on line transect estimates of abundance
... Abstract Line transect sampling is a distance sampling method for estimating the abundance of wild animal ...the transect and observer can thus cause substantial ...the transect ...
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The uniformly most powerful invariant test for two models of detection function in point transect sampling
... sampling (Zhang, 2003; Eidous, 2005). Although this problem has been previ- ously addressed by Mack (1998) and Zhang (2001) in line transect sampling, no attempt has been made in the context ...
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Line-transect distance sampling compared with fixed-width strip-transect counts for assessing tomtit (Petroica macrocephala) population trends
... Distance sampling and fixed-width strip-transect counts were compared as methods for estimating population trends of the tomtit (Petroica macrocephala) from late September / early October to early November ...
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Influence of transect length and downed woody debris abundance on precision of the line-intersect sampling method
... varying transect lengths) would impact estimates and their uncertainty, a model is in- ...selected transect are likely to display autocorrelation because of the fixed characteristics of the downed woody ...
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Double-observer line transect methods : levels of independence
... methods, line transect methods use knowledge of the distribution of a covariate which affects detection probability (namely distance from the transect line) in ...double-observer line ...
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Double observer line transect methods : levels of independence
... Double-observer line transect survey methods were used because for many species detection of animals on the trackline was expected to be less than ...
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Transect sampling of vegetation formations of phanerophytes and chamaephytes (I): methodological fundamentals
... K EY WORDS : geobotanical method; phanerophytes; chamaephytes; transect; sampling plots. R ÉSUMÉ Nous présentons ici une méthode géobotanique quantitative d’Inventaire de forma- tions végétales homogènes ...
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FACTORS AFFECTING LINE TRANSECT ESTIMATES OF DOLPHIN SCHOOL DENSITY
... The relatively large estimate of density for the ex- perienced team’s good-visibility-condition data may be caused by: (1) incorrectly recording sightings near the track[r] ...
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Methods for investigating measurement error in cetacean line transect surveys
... This study serves as an example of the value of so-called ships of opportunity not only for collecting cetacean sightings data, but also as inexpensive platforms for conducting experiments that inform researchers about ...
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Habitat-dependency of transect walk and pan trap methods for bee sampling in farmlands
... The second aim of the study was to gain insights into the community structure of wild bees trapped by two sampling methods. For the analysis of the genera composition of the sampled bee assemblages, the sampled ...
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