Article
Plant Sciences
Youhua Chen, Ren-Hong Wang, Tsung-Jen Shen
Summary: Conducting biodiversity surveys using a fully randomised design can be difficult due to budgetary constraints, site accessibility, and other constraints. The commonly used biodiversity estimators may not perform well when applied to non-independent sampling of individuals. In this study, a Markov chain model is utilized to account for non-independence in sequential sampling, and the estimators perform reasonably well in empirical tests.
FRONTIERS IN PLANT SCIENCE
(2023)
Article
Multidisciplinary Sciences
Douglas B. Sigourney, Annamaria Deangelis, Danielle Cholewiak, Debra Palka
Summary: Visual line transect (VLT) surveys and passive acoustic monitoring (PAM) are important methods for monitoring and studying marine mammals. This study presents a framework to combine these data streams to estimate abundance and derive an estimate of availability bias. Three methods were evaluated and the results showed that the CMR-DS method was the least biased and most precise.
Article
Ecology
Heather E. Gaya, Lora L. Smith, Clinton T. Moore
Summary: Line-transect distance sampling (LTDS) surveys are commonly used to estimate the abundance of animals or objects. In this study, the researchers proposed a method to control for detection bias caused by spatially heterogeneous vegetation obstruction in terrestrial LTDS surveys of gopher tortoise burrows. By measuring ground-level vegetation as a covariate, the researchers were able to improve the accuracy of density estimation. The study found that failure to consider vegetation obstruction can lead to underestimation of population size and proportion of individuals with small burrow sizes.
JOURNAL OF WILDLIFE MANAGEMENT
(2023)
Article
Engineering, Industrial
Ning Wei, Zhenzhou Lu, Yingshi Hu
Summary: This paper proposes a new method called the stochastic collocation enhanced line sampling (SC-LS) method for reliability analysis. By using Gaussian quadrature combined with the multiplicative dimensionality reduction method, the method directly estimates the integration of the one-dimensional conditional failure probability and calculates the failure probability as a weighted sum. This method avoids the variability in the estimate of failure probability caused by random sampling in the traditional line sampling approach, and it is less sensitive to the choice of importance direction.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2023)
Article
Ecology
Timothy A. Gowan, Nathan J. Crum, Jason J. Roberts
Summary: Wildlife population studies aim to estimate density, movement, and demographic parameters, linking these to covariates like habitat features for ecological insights and management predictions. Different methods such as line-transect surveys and capture-recapture are used for estimation, with recent developments in open population spatial capture-recapture models to estimate density and demographic parameters simultaneously. The model discussed in the text can integrate data from various sources, model variation in density, and demographic parameters as a function of habitat covariates.
ECOLOGY AND EVOLUTION
(2021)
Article
Ecology
Kathryn Knights, Michael A. McCarthy, James Camac, Gurutzeta Guillera-Arroita
Summary: The study introduces a method to improve the efficiency of distance sampling in high density target species by measuring only a proportion of targets to model the detection function and using the saved time to cover longer total length of transect. This approach can enhance the precision of population density estimates within a fixed survey budget, and the simulations indicate that the optimized method could increase precision by 20% to 50%.
METHODS IN ECOLOGY AND EVOLUTION
(2021)
Article
Fisheries
Hiroko Sasaki, Yu Kanaji, Takashi Hakamada, Koji Matsuoka, Tomio Miyashita, Shingo Minamikawa
Summary: Coastal whaling targeting Baird's beaked whales has a long history, and the abundance of this species in the waters off the Pacific coast of Japan has not been estimated for management purposes for more than a quarter of a century. In this study, the latest abundances of Baird's beaked whales since 2008 were estimated using line transect analyses. The estimated abundances were smaller than past estimates from the early 1990s, indicating the need for further monitoring and conservation efforts.
Article
Statistics & Probability
Hassan S. Bakouch, Christophe Chesneau, Rawda I. Abdullah
Summary: The paper proposes a new two-parameter detection model for modeling line transect data and considers the maximum likelihood estimation of the parameters. Through application to a practical data set and comparison with goodness-of-fit statistics, confidence intervals of the parameters and estimated population abundance are obtained under the proposed detection model.
COMMUNICATIONS IN STATISTICS-THEORY AND METHODS
(2022)
Article
Chemistry, Analytical
Siyuan Xi, Zhaojiang Zhang, Yufen Niu, Huirong Li, Qiang Zhang
Summary: This paper proposes a method for extracting power line points and detecting tree risk. It uses the height difference and local dimension feature probability model to extract power line points and introduces the Cloth Simulation Filter algorithm and neighborhood sharing method to distinguish conductors and ground wires. The conductor reconstruction is realized using the linear-catenary model, and a tree risk point candidate area is constructed based on the conductor's reconstruction curve to exclude non-risk points. The tree risk points are detected using a grading strategy for safety distance calculation.
Article
Multidisciplinary Sciences
Shane Patterson, Jonathan Harris, Stephen Dinsmore, Karen Kinkead
Summary: This study evaluated the butterfly density estimates derived from Pollard-Yates line transects and distance sampling, and found that detection probability varied beyond 2.5 m, with distance sampling estimating higher butterfly densities.
Article
Environmental Sciences
Camille Ollier, Ilona Sinn, Oliver Boisseau, Vincent Ridoux, Auriane Virgili
Summary: Estimating the detection probability of small cetaceans, this study focuses on using the Mark-Recapture Distance Sampling (MRDS) methodology to estimate visual, acoustic, and combined detection probability. The results show that passive acoustic monitoring can be used as an independent platform in MRDS to estimate the detection probability. Without correcting for detection biases, total abundance would be underestimated by a factor of two.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Ecology
Miguel Munoz Mazon, Kari Klanderud, Douglas Sheil
Summary: This study examines how disturbance affects the distribution ranges of tree and shrub species in the high elevations of the Talamanca Mountains in Costa Rica. The findings suggest that light availability and disturbance play a significant role in shaping the elevation range dynamics of these species.
Article
Chemistry, Analytical
Bin Lu, Qing Li, Yanju Liang
Summary: In this study, a real-time detection model for crowded pedestrian targets is proposed, which improves detection accuracy and robustness through attention mechanism and feature fusion. It is suitable for low-cost blind-filling LiDAR.
Article
Ecology
Anja Hutschenreiter, Gabriel Ramos-Fernandez, Filippo Aureli
Summary: When surveying Geoffroy's spider monkeys in a flat landscape of tropical forest with homogenous visibility, line-transect sampling was found to be more efficient than point-transect sampling. However, when controlling for the size of the survey area, more spider monkeys were detected at point transects. More monkey detections were made during the first 10 minutes than during the second and third 10-minute periods of point-transect surveys.
Article
Computer Science, Information Systems
Malik Haris, Adam Glowacz
Summary: This paper proposes a lane detection framework based on object feature distillation, which adds a decoder with strong feature prediction ability to the network and utilizes knowledge distillation technology to enhance lane detection performance without additional complexity.