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 +7 more
core +1 more source
A hierarchical modeling framework for multiple observer transect surveys. [PDF]
PLoS ONE, 2012 Ecologists often use multiple observer transect surveys to census animal populations. In addition to animal counts, these surveys produce sequences of detections and non-detections for each observer. When combined with additional data (i.e.
Paul B Conn +2 more
doaj +1 more source
Estimating a Resource Selection Function With Line Transect Sampling [PDF]
Journal of Applied Mathematics and Decision Sciences, 2002 A resource selection probability function is a function that gives the prob- ability that a resource unit (e.g., a plot of land) that is described by a set of habitat variables X1 to Xp will be used by an animal or group of animals in a certain period of time.
openaire +3 more sources
Status Review of Guinayangan Quezon Mangrove Forest: An Assessment of Species Diversity and Habitat Analysis [PDF]
E3S Web of ConferencesThis study was conducted to determine the status of the Mangrove Walk located in Brgy. Calimpak, Guinayangan, Quezon. Three main procedures were undertaken: species identification; habitat analysis using percent crown cover, regeneration per m², and ...
Escobal Charisse Angelique M. +1 more
doaj +1 more source
Using hidden Markov models to deal with availability bias on line transect surveys [PDF]
, 2013 This work was supported by EPSRC grant EP/I000917/1We develop estimators for line transect surveys of animals that are stochastically unavailable for detection while within detection range.
Heide-Jorgensen, M. P. +14 more
core +1 more source
Mixed effect models in distance sampling [PDF]
, 2013 Recently, much effort has been expended for improving conventional distance sampling methods, e.g. by replacing the design-based approach with a model-based approach where observed counts are related to environmental covariates (Hedley and Buckland, 2004)
Oedekoven, Cornelia Sabrina
core +2 more sources
Sample based estimation of landscape metrics; accuracy of line intersect sampling for estimating edge density and Shannon’s diversity index [PDF]
, 2009 A recent trend is to estimate landscape metrics using sample data and cost-efficiency is one important reason for this development. In this study, line intersect sampling (LIS) was used as an alternative to wall-to-wall mapping for estimating Shannon’s ...
Ramezani, Habib, Holm, Sören
core +2 more sources
A Unimodal Model for Double Observer Distance Sampling Surveys. [PDF]
PLoS ONE, 2015 Distance sampling is a widely used method to estimate animal population size. Most distance sampling models utilize a monotonically decreasing detection function such as a half-normal.
Earl F Becker, Aaron M Christ
doaj +1 more source
Long-term population trends of introduced mammals on an tropical island
Global Ecology and Conservation, 2023 The introduction of species in areas with no top-down control is a recipe for ecosystem catastrophe. Theory predicts that introduced species in areas that lack predators may experience rapid growth and subsequently crash or stabilize around the carrying ...
Júlio Haji +5 more
doaj +1 more source
Zoologia (Curitiba), 2013 Line-transect surveys are commonly used for sampling large mammals, but estimates of the effort needed to reliably surveying low-diversity assemblages of mammals are scarce.
Ítalo Mourthé
doaj +3 more sources