R: Identify cardinal dates in ecological time series
cardidates-package
R Documentation
Identify cardinal dates in ecological time series
Description
The package aims to identify “cardinal dates” (begin, time of maximum, end of
mass developments) in ecological time series using fitted Weibull-type functions.
Details
Package:
cardidate
Type:
Package
Version:
0.4-7
Date:
2015-09-06
License:
GNU Public License 2 or above
Phenology and seasonal succession in aquatic ecosystems are strongly
dependent on physical factors. In order to promote investigations
into this coupling, objective and relible methods of characterising
annual time series are important.
The proposed methods were developed within the AQUASHIFT research program
and used to determine the beginning, maximum
and end of the spring mass development of phytoplankton in different lakes
and water reservoirs. These time points, which we call “cardinal dates”,
can be analysed for temporal trends and relationships to climate variables.
The complete methodology is described in Rolinski et. al (2007).
Until now we implemented only the most reliable approach using Weibull-Functions
(Method B in the article), other algorithms may follow when required.
The methodology may also be useful for other ecological time series
(e.g. small mammals or insects). Please don't hesitate to contact the package maintainer
if you feel that this package should be generalized to other processes.
Maintainer: Thomas Petzoldt <thomas.petzoldt@tu-dresden.de>
References
Rolinski, S., Horn, H., Petzoldt, T. & Paul, L. (2007): Identification of cardinal
dates in phytoplankton time series to enable the analysis of long-term trends.
Oecologia 153, 997 - 1008. http://dx.doi.org/10.1007/s00442-007-0783-2.
Wagner, A., Hülsmann, S., Paul, L., Paul, R. J., Petzoldt, T.,
Sachse, R., Schiller, T., Zeis, B., Benndorf, J. & Berendonk, T. U. (2012):
A phenomenological approach shows a high coherence of warming patterns in
dimictic aquatic systems across latitude- Marine Biology 159(11),
2543-2559. http://dx.doi.org/10.1007/s00227-012-1934-5.