@article{PAR00001711,
  title = {{I}ndices for capturing spatial patterns and their evolution in time, with application to {E}uropean hake ({M}erluccius merluccius) in the {B}ay of {B}iscay},
  author = {{W}oillez, {M}. and {P}oulard, {J}. {C}. and {R}ivoirard, {J}. and {P}etitgas, {P}. and {B}ez, {N}icolas},
  editor = {},
  language = {{ENG}},
  abstract = {{A} series of candidate statistical indices is used in an attempt to capture spatial patterns of fish populations from research survey data. {T}o handle diffuse population limits, indices are designed not to depend on arbitrary delineation of the domain. {T}hey characterize the location (centre of gravity and spatial patches), the occupation of space (inertia, isotropy, positive area, spreading area, and equivalent area), statistical dispersion ({G}ini index and coefficient of variation of strictly positive densities), and microstructure. {C}ollocation between different ages and years is summarized by a global index of collocation. {I}ndices are estimated for hake from a bottom-trawl data series in the {B}ay of {B}iscay in autumn of 1987-2004. {T}he study provides a detailed description of the spatial patterns of different hake age groups, age 3 appearing to be a turning point in these dynamics. {C}apturing spatial patterns through indices allows the comparison of surveyed populations and identification of trends and outliers in the time-series. {S}patial indices are used in a multivariate approach to obtain an overview of the relationships between the different spatial indices characterizing the spatial behaviour of six age groups of hake, and to assess their persistence through time.},
  keywords = {{B}ay of {B}iscay ; {E}uropean hake ; spatial indices},
  booktitle = {},
  journal = {{I}ces {J}ournal of {M}arine {S}cience},
  volume = {64},
  numero = {3},
  pages = {537--550},
  ISSN = {1054-3139},
  year = {2007},
  DOI = {10.1093/icesjms/fsm025},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00001711},
}