Description Usage Arguments Details Value Author(s) References See Also Examples
View source: R/pielouEvenness.R
This function calculates Pielou's Species Evenness for j areas and i years.
pielouEvenness(X, groups, species.table = NULL, metric = "ABUNDANCE", years)
A dataframe of fishery independent data derived from research vessel
survey data or model output, with columns
A vector indicating the species group(s) for which to calculate
the indicator. If
A table where the column names match the entries in
A character string indicating which column in
A vector of years for which to calculate indicator.
Pielou's Species Evenness:
J' = -Σ p_i ln( p_i )/ln(S)
p_i is the proportion of the total sample contributed by the i(th) species and S is the number of species recorded in the sample. Pielou's Index is the Shannon-Weiner Index computed for the sample S and represents a measure of evenness of the community (Pielou, 1966).
Returns a dataframe with columns
YEAR, and a
PielouEvenness_group for each entry in
If there is no data for spatial scale j in year i, indicator
values is assigned
Danielle Dempsey Danielle.Dempsey@dfo-mpo.gc.ca, Adam Cook, Catalina Gomez, Alida Bundy
Bundy A, Gomez C, Cook AM. 2017. Guidance framework for the selection and evaluation of ecological indicators. Can. Tech. Rep. Fish. Aquat. Sci. 3232: xii + 212 p.
Greenstreet SP, Rogers SI. 2006. Indicators of the health of the North Sea fish community: identifying reference levels for an ecosystem approach to management. ICES J Mar Sci J du Cons 63:573 593
Pielou EC. 1975. Ecological Diversity. Wiley, New York. ISBN 0-471-68925-4
Other biodiversity indicators:
1 2 3
data(X) pielouEvenness(X, groups = "ALL", species.table = NULL, metric = "ABUNDANCE", years = c(2014:2019))
ID YEAR PielouEvenness_ALL 1 AREA1 2014 0.3641888 2 AREA1 2015 0.3894733 3 AREA1 2016 0.3281575 4 AREA1 2017 0.4007546 5 AREA1 2018 0.4218297 6 AREA1 2019 0.2703277 7 AREA2 2014 0.3972961 8 AREA2 2015 0.4252770 9 AREA2 2016 0.3828098 10 AREA2 2017 0.4034722 11 AREA2 2018 0.3196600 12 AREA2 2019 0.3631935
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