Results 251 to 260 of about 123,013 (299)
, 2009 Publisher Summary This chapter covers the abundance estimation, the range of techniques by which the size of a population of marine mammals can be estimated. When it is difficult to estimate absolute abundance with an acceptably low bias, relative abundance indices are often used instead.
Stephen T. Buckland, Anne E. York
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Estimating abundance of tuatara
Biological Conservation, 1999Abstract The conservation history of an endemic New Zealand reptile, tuatara ( Sphenodon spp.) is used to illustrate the necessity for accurate knowledge of population abundance for the effective management and subsequent recovery of threatened species.
Phillip Cassey, Graham T Ussher
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Science, 2021
Paleontology Estimating the abundance of a species is a common practice for extant species and can reveal many aspects of its ecology, evolution, and threat level. Estimating abundance for species that are extinct, especially those long extinct, is a much trickier endeavor. Marshall et al.
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Paleontology Estimating the abundance of a species is a common practice for extant species and can reveal many aspects of its ecology, evolution, and threat level. Estimating abundance for species that are extinct, especially those long extinct, is a much trickier endeavor. Marshall et al.
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2001
Ecologists are interested in assessing the absolute or relative size of a population in a given community in many contexts. A forester wants to develop an inventory of the flora of an area. A conservationist wishes to monitor the effect of protection on an endangered species.
Anil Gore, Sharayu Paranjpe
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Ecologists are interested in assessing the absolute or relative size of a population in a given community in many contexts. A forester wants to develop an inventory of the flora of an area. A conservationist wishes to monitor the effect of protection on an endangered species.
Anil Gore, Sharayu Paranjpe
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A Review of Estimating Animal Abundance
Biometrics, 1986During the past 5 years there have been a number of important developments in the estimation of animal abundance and related parameters such as survival rates. Many of the new techniques need to be more widely publicized as they supplant previous methods. The aim of this paper is to review this literature and suggest further avenues for research.
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Sequential Estimation of Log(Abundance)
Biometrics, 1996Summary: I discuss the estimation of the abundance of a biological population, its logarithm, and the variances of these estimates, from a sequential sampling scheme with minimum and maximum sample sizes. Observations are counts of organisms in randomly chosen ``packets'' such as cores, branches, bushes, and so forth.
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Estimating Abundance from Occurrence: An Underdetermined Problem
The American Naturalist, 2007() M2 where M1 and M2 are the total numbers of cells for map 1 and map 2, respectively, and m1 and m2 are the numbers of occupied cells of the respective maps. Critically, this empirical approach has been shown in practice to work well, or at least substantially better than existing alternatives, for estimating the abundances ...
Gaston, K., He, F.
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Estimating the Number of Species in a Stochastic Abundance Model
Biometrics, 2002Consider a stochastic abundance model in which the species arrive in the sample according to independent Poisson processes, where the abundance parameters of the processes follow a gamma distribution. We propose a new estimator of the number of species for this model.
Chao, Anne, Bunge, John
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Abundance estimation of spectrally similar minerals
2009 IEEE International Geoscience and Remote Sensing Symposium, 2009This paper evaluates a spectral unmixing method for estimating the partial abundance of spectrally similar minerals in complex mixtures. The method requires formulation of a linear function of individual spectra of individual minerals. The first and second derivatives of each of the different sets of mixed spectra and the individual spectra are ...
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A Review of Estimating Animal Abundance II
International Statistical Review / Revue Internationale de Statistique, 1992Summary: The literature describing methods of estimating animal abundance and related parameters continues to grow. This paper reviews recent developments in the subject over the past six years and updates the author's previous review, Biometrics 42, 267-292 (1986); see also his book, ``The estimation of animal abundance and related parameters'' (1973;
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