Results 241 to 250 of about 483,708 (267)
Some of the next articles are maybe not open access.
Agent-based simulations improve abundance estimation
Biologia Futura, 2023Abundance is a fundamental characteristic of every biological population and is the focus of many research programs in ecology and conservation. In this paper I give an overview of the challenges of estimating abundance. I argue that truly understanding, validating, and refining the field techniques and quantitative methods used to estimate abundance ...
openaire +2 more sources
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.
openaire +3 more sources
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
openaire +1 more source
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
openaire +1 more source
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.
openaire +1 more source
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.
openaire +2 more sources
Estimating belowground plant abundance with DNA metabarcoding
Molecular Ecology Resources, 2019AbstractMost work on plant community ecology has been performed above ground, neglecting the processes that occur in the soil. DNA metabarcoding, in which multiple species are computationally identified in bulk samples, can help to overcome the logistical limitations involved in sampling plant communities belowground.
Silvia Matesanz +10 more
openaire +3 more sources
Fluorometric estimation of surface associated microbial abundance
Journal of Microbiological Methods, 2012Surface associated microbes have historically been difficult to accurately and effectively enumerate. In the current study, we propose a rapid and simple method for estimating abundance of surface associated microbial cells by fluorescence of SYBRGreen stained bacteria and in vivo chlorophyll a fluorescence of benthic diatoms in 24 and 48-well ...
Gabriel J, Swenson +3 more
openaire +2 more sources
Estimating Abundance from Longline Catches
Journal of the Fisheries Research Board of Canada, 1960The various factors that enter into the catch of fish by a baited longline are combined into equations that permit using the information afforded by the catches to compute linear estimates of abundance, providing that all rates can be estimated reasonably accurately, and assuming they are linear.
openaire +1 more source
Introduction to Estimating Wildlife Abundance
2001Estimating animal abundance is central to sound management and is an important part of most wildlife research programs. Counting animals is a challenging task that will take you to many fascinating places that you would not otherwise see. I myself have spent many years in the bush trying to figure out how many animals were in my survey areas, and I ...
openaire +1 more source
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;
openaire +2 more sources