Dataset due to Saunders
A dataframe with each row representing species inventories for a kelp
saunders) together with a Boolean flag indicating
whether the holdfast was in a sheltered or exposed location. Also two
data frames, one for the 20 exposed holdfasts (
and one for the 20 sheltered holdfasts (
count objects, giving counts for all organisms
saunders.tot), all those from exposed locations
saunders.exposed.tot), and all those from sheltered locations
Kelp are large seaweeds classified in kingdom Chromista. Kelp grows
in shallow oceans in kelp forests.
The holdfast is a root-like structure that anchors the kelp to
the ocean floor. Fauna inhabiting kelp holdfasts, being
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
It is not entirely obvious how to derive the summary datasets from the
saunders dataframe. Use function
extractor() for this.
saunders is a data frame with 40 observations on 177
variables. The observations (rows) are 40 holdfasts and the variables
are, with the exception of the first one, the numbers of each of 176
species living there. The first variable is a Boolean, indicating
whether or not that holdfast was exposed (
TRUE) or sheltered
saunders.sheltered are objects of class
are the species abundance for sheltered holdfasts, exposed
holdfasts, and the entire dataset.
Data supplied by Justine Saunders
- J. Saunders 2007.
Biodiversity of kelp holdfasts(provisional title). PhD thesis (in preparation); School of Geography and Environmental Sciences, The University of Auckland
- M. J. Anderson and others 2005.
Consistency and variation in kelp holdfast assemblages: Spatial patterns of biodiversity for the major phyla at different taxonomic resolutions. Journal of Experimental Marine Biology and Ecology. volume 320, pages 35-56
data(saunders) plot(saunders.sheltered.tot, uncertainty=TRUE, n=1) preston(saunders.tot) plot(extant(extractor(saunders,1)))