saunders
) including a Boolean flag indicating whether the
holdfast was in a sheltered or exposed location. Also two data frames, one for the 20 exposed holdfasts
(saunders.exposed
) and one for the 20 sheltered holdfasts
(saunders.sheltered
).
Also three count
objects, giving counts for all organisms
(saunders.tot
), all those from exposed locations
(saunders.exposed.tot
), and all those from sheltered locations
only (saunders.sheltered.tot
).
data(saunders)
saunders
is a dataframe with 40 observations on 177
variables. Each row corresponds to a holdfast. The first column is
Boolean, indicating whether or not that holdfast was exposed
(TRUE
) or sheltered (FALSE
). The other columns show
species abundances for each of 176 species.
Summary datasets saunders.sheltered.tot
,
saunders.exposed.tot
, and saunders.tot
are objects of
class count
that are the species abundance for sheltered
holdfasts, exposed holdfasts, and the entire dataset. The user will probably be most interested in saunders.sheltered
and saunders.exposed
, which are the transpose of the
appropriate rows of saunders
. Thus these dataframes have 176
rows, one per species and 20 rows, one per holdfast.
The data was collected in New Zealand, from eight sites along the Leigh coastline from north of Leigh Harbour down to the southern end of Kawau Island (a stretch of roughly 20 km). Four sites were wave-exposed, four were sheltered (although two of the latter were arguably quite tidally-dominated). Each site had a spatial extent of roughly one hectare. They were collected from 5 - 10 November, 2003.
The saunders
dataset must be arranged as it is because if it
were transposed, the first row would be the (nonsensical) observation
c(T,T,...,T,F,...,F)
.
extractor
data(saunders)
plot(saunders.sheltered.tot, uncertainty=TRUE, n=1)
preston(saunders.tot)
optimal.params.sloss(saunders.exposed)
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