Results 21 to 30 of about 2,314,115 (247)

A hierarchical model to estimate the abundance and biomass of salmonids by using removal sampling and biometric data from multiple locations [PDF]

, 2010
We present a Bayesian hierarchical model to estimate the abundance and the biomass of brown trout (Salmo trutta fario) by using removal sampling and biometric data collected at several stream sections.
Christophe Laplanche, Ruiz, Philippe, Philippe Ruiz, Laplanche, Christophe   +3 more
core   +1 more source

Re-assessing abundance of Southern Hudson Bay polar bears by aerial survey: effects of climate change at the southern edge of the range

Arctic Science, 2018
The Southern Hudson Bay polar bear (Ursus maritimus Phipps, 1774) subpopulation is considered stable, but conflicting evidence lends uncertainty to that designation.
Martyn E. Obbard, Seth Stapleton, Guillaume Szor, Kevin R. Middel, Charles Jutras, Markus Dyck   +5 more
doaj   +1 more source

Using digital recordings and sonogram analysis to obtain counts of yellow rails

Wildlife Society Bulletin, 2016
Autonomous recording units (ARUs) are emerging as a useful technology for the study and monitoring of animals that produce vocalizations. During summer and fall of 2013, we performed a series of experiments aimed at developing sampling protocols to count
Kiel L. Drake, Matthew Frey, Danica Hogan, Richard Hedley   +3 more
doaj   +1 more source

Abundance and distribution of delphinids in the Red Sea (Egypt) [PDF]

, 2015
Knowledge about cetaceans in the Red Sea is limited with only a handful of sporadic or spatially-limited studies carried out to date. Funded by the Italian Cooperation through a Debt-for-Nature Swap programme and carried out in collaboration with the ...
Costa, Marina
core   +2 more sources

Distribution, abundance, and feeding ecology of baleen whales in Icelandic waters: have recent environmental changes had an effect? [PDF]

, 2015
Date of Acceptance: 13/01/2015The location of Iceland at the junction of submarine ridges in the North-East Atlantic where warm and cold water masses meet south of the Arctic Circle contributes to high productivity of the waters around the island. During
Bjarni Mikkelsen, Anna Schleimer, Nils eÖien, Bjarki Þór Elvarsson, Philip S. Hammond, Thorvaldur eGunnlaugsson, Vikingsson, Gisli A, Schleimer, Anna, Silva, Teresa, Bjarni eMikkelsen, Øien, Nils, Anna eSchleimer, Pike, Daniel G, Héðinn Valdimarsson, Philip eHammond, Gísli A. Víkingsson, Genevieve eDesportes, Teresa Silva, Héðinn eValdimarsson, Mikkelsen, Bjarni, Desportes, Geneviève, Teresa eSilva, Valur Bogason, Bjarki Þ. Elvarsson, Nils Øien, Gunnlaugsson, Thorvaldur, Gísli Arnór Víkingsson, Daniel G. Pike, Valdimarsson, Héðinn, Hammond, Philip Steven, Elvarsson, Bjarki Þ, Bogason, Valur, Valur eBogason, Thorvaldur Gunnlaugsson, Geneviève Desportes   +34 more
core   +1 more source

A Rapid Assessment of the Marine Megafauna Biodiversity Around South Bali, Indonesia

Frontiers in Marine Science, 2021
A low-cost, small-boat, rapid assessment survey was conducted on the waters off the southern Peninsula of Bali. The objectives were: (1) to conduct an inventory of cetacean species in the study area; (2) to map cetacean distribution to inform the design ...
Putu Liza Kusuma Mustika, Putu Liza Kusuma Mustika, Rob Williams, Hanggar Prasetio Kadarisman, Andri Oktapianus Purba, I Putu Ranu Fajar Maharta, Deny Rahmadani, Elok Faiqoh, I Made Iwan Dewantama   +8 more
doaj   +1 more source

Abundance and survival of Pacific humpback whales in a proposed critical habitat area [PDF]

, 2013
This research was funded through grants to Cetacealab and Gitga’at First Nation from Julie Walters and Sam Rose, and Fisheries and Oceans Canada (Cetacean Research Program, Species at Risk Program).
Erin Ashe, Christopher R. Picard (457396), Williams, Robert, Picard, Christopher R., Wray Janie, Christopher R. Picard, Christopher R Picard, Ashe Erin, Picard Christopher R., Erin Ashe (197144), Rob Williams (136604), Rob Williams, Williams Rob, Ashe, Erin, Wray, Janie, Janie Wray (457395), Janie Wray   +16 more
core   +2 more sources

Distance Sampling in R

Journal of Statistical Software, 2019
Estimating the abundance and spatial distribution of animal and plant populations is essential for conservation and management. We introduce the R package Distance that implements distance sampling methods to estimate abundance. We describe how users can
David L. Miller, Eric Rexstad, Len Thomas, Laura Marshall, Jeffrey L. Laake   +4 more
doaj   +1 more source

Methods for investigating measurement error in cetacean line-transect surveys [PDF]

, 2007
Line-transect estimates of abundance generally assume that distances and angles to animals are measured without error. Biased distance measurements will lead to corresponding bias in abundance estimates.
Williams, Robert, Zerbini, AN, Hammond, Philip Steven, Leaper, R, Alexandre N. Zerbini, Philip S. Hammond, Russell Leaper, Rob Williams   +7 more
core   +1 more source

Assessing the efficacy and cost‐effectiveness of integrating autonomous recording units and point‐count surveys for population monitoring of northern bobwhite (Colinus virginianus)

Ecological Solutions and Evidence
Autonomous recording units (ARUs) have emerged as a useful tool for monitoring a wide range of acoustically signalling wildlife species in a cost‐effective manner, but estimating abundance from acoustic data can be challenging.
William B. Lewis, Clint Johnson, James A. Martin   +2 more
doaj   +1 more source