Ecological Trajectory Analysis R package ecotraj version 1.2.2 Analysis of temporal changes (i.e. dynamics) of ecological entities, defined as trajectories on a chosen multivariate space, by providing a set of trajectory metrics and visual representations [De Caceres et al. (2019) <doi:10.1002/ecm.1350>; and Sturbois et al. (2021) <doi:10.1016/j.ecolmodel.2020.109400>; Djeghri et al. (2026a) <doi:10.1002/ecm.70058>; Djeghri et al. (2026b) <doi:10.24072/pcjournal.736>]. Includes functions to estimate metrics for individual trajectories (length, directionality, angles, ...) as well as metrics to relate pairs of trajectories (dissimilarity and convergence). Functions are also provided to estimate the ecological quality of ecosystem with respect to reference conditions [Sturbois et al. (2023) <doi:10.1002/ecs2.4726>]. Software Depends: R (>= 3.5.0), Rcpp (>= 0.12.12) Imports: MASS LinkingTo: Rcpp Suggests: ape, vegclust, knitr, rmarkdown, RColorBrewer, smacof, vegan, ggplot2, reshape2, scales, tidyr, viridis, testthat (>= 3.0.0) Miquel De Cáceres <miquelcaceres@gmail.com> Comprehensive R Archive Network (CRAN) Miquel De Cáceres [aut, cre] (ORCID: <https://orcid.org/0000-0001-7132-2080>), Nicolas Djeghri [aut] (ORCID: <https://orcid.org/0000-0001-5740-3386>), Anthony Sturbois [aut] (ORCID: <https://orcid.org/0000-0002-9219-4468>), Javier De la Casa [ctb] GPL (>= 2) 2026-06-18 application/tgz https://CRAN.R-project.org/package=ecotraj doi:10.32614/CRAN.package.ecotraj