Results 11 to 20 of about 113,696 (258)

When no color pattern is available: Application of double observer methods to estimate population size of the Alpine salamander

Arctic, Antarctic, and Alpine Research, 2021
Monitoring wild populations is an essential tool to assess the conservation status and the ecological requirements of a species. Capture–mark–recapture (CMR), based on individual recognition, is the most commonly used and most effective technique ...
Antonio Romano, Luca Roner, Andrea Costa, Sebastiano Salvidio, Matteo Trenti, Paolo Pedrini   +5 more
doaj   +1 more source

Fine‐tuning the performance of abundance estimation based on environmental DNA (eDNA) focusing on eDNA particle size and marker length

Ecology and Evolution, 2022
Reliable abundance estimation is a primary challenge in environmental DNA (eDNA) analysis, which has been addressed by considering the effects of eDNA transport and degradation.
Toshiaki Jo, Hiroki Yamanaka
doaj   +1 more source

Estimating Species Abundance from Occurrence [PDF]

The American Naturalist, 2000
The number of individuals, or the abundance, of a species\ud in an area is a fundamental ecological parameter and a\ud critical consideration when making management and conservation decisions (Andrewartha and Birch 1954; Krebs\ud 1978; Gaston 1994; Caughley and Gunn 1996).
Gaston, K.J., He, F.
openaire   +4 more sources

Estimating the Density of the Abundant Numbers

Integers, 2019
See the abstract in the attached pdf.
Klyve, Dominic, Pidde, Melissa, Temple, Kathryn E.   +2 more
openaire   +4 more sources

Hybrid mark–resight approaches account for heterogeneous detection bias in aerial surveys

Ecological Solutions and Evidence, 2023
Population abundance estimation is a critical yet challenging task for wildlife management decision‐making. For aerial surveys of terrestrial mammals in highly heterogenous landscapes, estimation models that address multiple sources of detection bias are
Kylie M. Curtis, Megan K. Jennings, Jeffrey Laake, Randy Botta, Janene Colby, Emma M. Tomaszewski, Rebecca L. Lewison   +6 more
doaj   +1 more source

Chemical abundances in Seyfert galaxies – X. Sulphur abundance estimates

Monthly Notices of the Royal Astronomical Society, 2023
ABSTRACT For the first time, the sulphur abundance relative to hydrogen (S/H) in the narrow-line regions of a sample of Seyfert 2 nuclei (Sy 2s) has been derived via direct estimation of the electron temperature. Narrow emission-line intensities from the Sloan Digital Sky Survey (SDSS) Data Release 17 (DR17) [in the wavelength range 3000
Oli L Dors, M Valerdi, R A Riffel, R Riffel, M V Cardaci, G F Hägele, Mark Armah, M Revalski, S R Flury, P Freitas-Lemes, E B Amôres, A C Krabbe, L Binette, A Feltre, T Storchi-Bergmann   +14 more
openaire   +3 more sources

Assessing bias in aerial surveys for cetaceans: Results from experiments conducted with the franciscana dolphin

Frontiers in Marine Science, 2022
Line transect aerial surveys are widely used for estimating abundance of biological populations, including threatened species. However, estimates obtained with data collected from aircraft are often underestimated because of visibility bias and bias in ...
Federico Sucunza, Federico Sucunza, Federico Sucunza, Daniel Danilewicz, Daniel Danilewicz, Artur Andriolo, Artur Andriolo, Franciele R. de Castro, Marta Cremer, Pablo Denuncio, Emanuel Ferreira, Paulo A. C. Flores, Paulo H. Ott, Paulo H. Ott, Martin S. Perez, Dan Pretto, Camila M. Sartori, Eduardo R. Secchi, Alexandre N. Zerbini, Alexandre N. Zerbini, Alexandre N. Zerbini, Alexandre N. Zerbini, Alexandre N. Zerbini   +22 more
doaj   +1 more source

Estimating abundance of an elusive cetacean in a complex environment: Harbor porpoises (Phocoena phocoena) in inland waters of Southeast Alaska

Frontiers in Marine Science, 2022
The harbor porpoise (Phocoena phocoena) is common in temperate waters of the eastern North Pacific Ocean, including Southeast Alaska inland waters, a complex environment comprised of open waterways, narrow channels, and inlets.
Alexandre N. Zerbini, Alexandre N. Zerbini, Kimberly T. Goetz, Karin A. Forney, Karin A. Forney, Charlotte Boyd, Charlotte Boyd   +6 more
doaj   +1 more source

Estimating ungulate abundance while accounting for multiple sources of observation error

Wildlife Society Bulletin, 2016
Whether a species is rare or overabundant, accurate estimates of population abundance are essential for the development and assessment of conservation plans and management goals.
Pat A. Terletzky, David N. Koons
doaj   +1 more source

Evaluating the suitability of close‐kin mark‐recapture as a demographic modelling tool for a critically endangered elasmobranch population

Evolutionary Applications, 2023
Estimating the demographic parameters of contemporary populations is essential to the success of elasmobranch conservation programmes, and to understanding their recent evolutionary history. For benthic elasmobranchs such as skates, traditional fisheries‐
Aurélien Delaval, Victoria Bendall, Stuart J. Hetherington, Hans J. Skaug, Michelle Frost, Catherine S. Jones, Leslie R. Noble   +6 more
doaj   +1 more source