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Appears in Collections:University of Stirling Research Data
Title: Dataset: Fourier analysis to detect phenological cycles using tropical field data and simulations
Creator(s): Bush, Emma R
Abernethy, Katherine
Jeffery, Kathryn Jane
Tutin, Caroline EG
White, Lee
Dimoto, Edmond
Dikangadissi, Jean-Thoussaint
Jump, Alistair S
Bunnefeld, Nils
Contact Email:
Keywords: Flowering
Spectral analysis
Tropical forests
Time-series data
Climate change
Circular analysis
Lopé National Park
Date Available: 3-Nov-2016
Citation: Bush, ER; Abernethy, K; Jeffery, KJ; Tutin, CEG; White, L; Dimoto, E; Dikangadissi, J-T; Jump, AS; Bunnefeld, N (2016): Dataset: Fourier analysis to detect phenological cycles using tropical field data and simulations. University of Stirling. Dataset.
Publisher: University of Stirling
Dataset Description (Abstract): Data to accompany manuscript Bush et al. Accepted in Methods in Ecology and Evolution October 2016. Fourier analysis to detect phenological cycles using tropical field data and simulations. Abstract for the publication is: 1.Changes in phenology are an inevitable result of climate change, and will have wide-reaching impacts on species, ecosystems, human society and even feedback onto climate. Accurate understanding of phenology is important to adapt to and mitigate such changes. However, analysis of phenology globally has been constrained by lack of data, dependence on geographically limited, non-circular indicators and lack of power in statistical analyses. 2. To address these challenges, especially for the study of tropical phenology, we developed a flexible and robust analytical approach - using Fourier analysis with confidence intervals - to objectively and quantitatively describe long-term observational phenology data even when data may be noisy. We then tested the power of this approach to detect regular cycles under different scenarios of data noise and length using both simulated and field data. 3. We use Fourier analysis to quantify flowering phenology from newly available data for 856 individual plants of 70 species observed monthly since 1986 at Lopé National Park, Gabon. After applying a confidence test, we find that 59% of the individuals have regular flowering cycles, and 88% species flower annually. We find time series length to be a significant predictor of the likelihood of confidently detecting a regular cycle from the data. Using simulated data we find that cycle regularity has a greater impact on detecting phenology than event detectability. Power analysis of the Lopé field data shows that at least six years of data are needed for confident detection of the least noisy species, but this varies and is often greater than 20 years for the most noisy species. 4. There are now a number of large phenology datasets from the tropics, from which insights into current regional and global changes may be gained, if flexible and quantitative analytical approaches are used. However consistent long-term data collection is costly and requires much effort. We provide support for the importance of such research and give suggestions as to how to avoid erroneous interpretation of shorter length datasets and maximize returns from long-term observational studies.
Dataset Description (TOC): (1.) Fourier_outputs_for_each_individual_tree.csv - Spreadsheet of Fourier outputs for each individual tree (2.) Fourier_outputs_for_each_individual_tree_metadata.csv - Spreadsheet with metadata for 'Fourier_outputs_for_each_individual_tree.csv' (3.) Fourier_outputs_summarised_for_each_species.csv - Spreadsheet of Fourier outputs summarised for each species (4.) Fourier_outputs_summarised_for_each_species_metadata.csv - Spreadsheet with metadata for 'Fourier_outputs_summarised_for_each_species.csv'
Type: dataset
Contract/Grant Title: GABON: maintain long-standing scientific profile
Funder(s): Agence Nationale des Parcs Nationaux (ANPN) (2010-2016)
Impact Studentship funded by the University of Stirling and ANPN (2013-2016)
International Centre for Medical Research in Franceville (CIRMF) (1986-2010)
Contract/Grant Number: GABON - 04962
Geographic Location(s): Lopé National Park, Gabon
Time Period: 1986-2016
Rights: Rights covered by the standard CC-BY 4.0 licence:
Affiliation(s) of Dataset Creator(s): Biological and Environmental Sciences, Faculty of Natural Sciences, University of Stirling
Institut de Recherche en Écologie Tropicale, Gabon
Agence Nationale des Parcs Nationaux (ANPN), Gabon

Files in This Item:
File Description SizeFormat 
Fourier_outputs_for_each_individual_tree.csvSpreadsheet of Fourier outputs for each individual tree67.81 kBCSVView/Open
Fourier_outputs_for_each_individual_tree_metadata.csvSpreadsheet with metadata for 'Fourier_outputs_for_each_individual_tree.csv'1.81 kBCSVView/Open
Fourier_outputs_summarised_for_each_species.csvSpreadsheet of Fourier outputs summarised for each species4.66 kBCSVView/Open
Fourier_outputs_summarised_for_each_species_metadata.csvSpreadsheet with metadata for 'Fourier_outputs_summarised_for_each_species.csv'1.87 kBCSVView/Open

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