Bias in phenology assessments based on first appearance data of butterflies
Tóm tắt
Data on the first appearance of species in the field season are widely used in phenological studies. However, there are probabilistic arguments for bias in estimates of phenological change if sampling methods or population abundances change. We examined the importance of bias in three measures of phenological change: (1) the date of the first X appearances, (2) the date of the first Y% of all first appearances and (3) the date of the first Z% of the individuals observed during the entire flight period. These measures were tested by resampling the data of the Dutch Butterfly Monitoring Scheme and by simulations using artificial data. We compared datasets differing in the number of sampling sites, population abundance and the start of the observation period. The date of the first X appearances proved to be sensitive to the number of sampling sites. Both the date of the first X appearances and the date of the first Y% of all first appearances were sensitive to population trend. No such biases were found for estimates of the first Z% of the flight period, but all three measures were sensitive to changes in the start of the observation period. The conclusions were similar for both the study on butterfly data and the simulation study. Bias in phenology assessments based on first appearance data may be considerable and should no longer be ignored in phenological research.
Tài liệu tham khảo
citation_journal_title=Bird Stud; citation_title=The phenology of spring bird migration to north Norway; citation_author=RT Barrett; citation_volume=49; citation_publication_date=2002; citation_pages=270-277; citation_doi=10.1080/00063650209461275; citation_id=CR1
citation_journal_title=Ardea; citation_title=Climatic change explains much of the 20th century advance in laying date of northern lapwing Vanellus vanellus in the Netherlands; citation_author=C Both, T Piersma, SP Roodbergen; citation_volume=93; citation_publication_date=2005; citation_pages=79-88; citation_id=CR2
Bruns E, van Vliet AJH (2003) Standardisation of phenological monitoring in Europe. Report of the European Phenology Network, Wageningen University, Deutscher Wetterdienst, Wageningen, Offenbach
citation_journal_title=Glob Change Biol; citation_title=Climatic trends and advancing spring flight of butterflies in lowland California; citation_author=ML Forister, AM Shapiro; citation_volume=9; citation_publication_date=2003; citation_pages=1130-1135; citation_doi=10.1046/j.1365-2486.2003.00643.x; citation_id=CR4
citation_journal_title=Proc Natl Acad Sci USA; citation_title=Climate change is affecting altitudinal migrants and hibernating species; citation_author=DW Inouye, B Barr, KB Armitage, BD Inouye; citation_volume=97; citation_publication_date=2000; citation_pages=1630-1633; citation_doi=10.1073/pnas.97.4.1630; citation_id=CR5
citation_title=Generalized linear models; citation_publication_date=1989; citation_id=CR6; citation_author=P McCullagh; citation_author=JA Nelder; citation_publisher=Chapman & Hall
citation_journal_title=Glob Change Biol; citation_title=European phenological response to climate change matches the warming pattern; citation_author=A Menzel, TH Sparks, N Estrella; citation_volume=12; citation_publication_date=2006; citation_pages=1969-1976; citation_doi=10.1111/j.1365-2486.2006.01193.x; citation_id=CR7
Pannekoek J, van Strien AJ (2001) TRIM 3 manual. Trends and indices for monitoring data. Research paper no. 0102. Statistics Netherlands, Voorburg
citation_journal_title=Nature; citation_title=A globally coherent fingerprint of climate change impacts across natural systems; citation_author=C Parmesan, G Yohe; citation_volume=421; citation_publication_date=2003; citation_pages=37-42; citation_doi=10.1038/nature01286; citation_id=CR9
citation_title=Monitoring butterflies for ecology and conservation; citation_publication_date=1993; citation_id=CR10; citation_author=E Pollard; citation_author=TJ Yates; citation_publisher=Chapman & Hall
citation_journal_title=Am J Bot; citation_title=Herbarium species demonstrate earlier flowering times in response to warming in Boston; citation_author=D Primack, C Imbres, RB Primack, AJ Miller-Rushing, P DelTredici; citation_volume=91; citation_publication_date=2004; citation_pages=1260-1264; citation_doi=10.3732/ajb.91.8.1260; citation_id=CR11
citation_journal_title=Glob Change Biol; citation_title=Phenology of British butterflies and climate change; citation_author=DB Roy, TH Sparks; citation_volume=6; citation_publication_date=2000; citation_pages=407-416; citation_doi=10.1046/j.1365-2486.2000.00322.x; citation_id=CR12
citation_journal_title=Int J Biometeorol; citation_title=Phenology and the changing pattern of bird migration in Britain; citation_author=TH Sparks; citation_volume=42; citation_publication_date=1999; citation_pages=134-138; citation_doi=10.1007/s004840050096; citation_id=CR13
citation_journal_title=Ibis; citation_title=Can we detect change in the phenology of winter migrant birds in the UK?; citation_author=TH Sparks, CF Mason; citation_volume=146; citation_publication_date=2004; citation_pages=57-60; citation_doi=10.1111/j.1474-919X.2004.00328.x; citation_id=CR14
citation_journal_title=Glob Change Biol; citation_title=Effects of climate change on the phenology of butterflies in the northwest Mediterranean Basin; citation_author=C Stefanescu, J Penuelas, I Filella; citation_volume=9; citation_publication_date=2003; citation_pages=1494-1506; citation_doi=10.1046/j.1365-2486.2003.00682.x; citation_id=CR15
citation_journal_title=J Avian Biol; citation_title=Patterns of change in timing of spring migration in North European songbird populations; citation_author=AP Tøttrup, K Thorup, C Rahbek; citation_volume=37; citation_publication_date=2006; citation_pages=84-92; citation_doi=10.1111/j.2006.0908-8857.03391.x; citation_id=CR16
citation_journal_title=J Ornithol; citation_title=What affects the magnitude of change in first arrival dates of migrant birds?; citation_author=P Tryanowksi, S Kuzniak, TH Sparks; citation_volume=146; citation_publication_date=2005; citation_pages=200-205; citation_doi=10.1007/s10336-005-0079-4; citation_id=CR17
citation_journal_title=Proc Exp Appl Entomol; citation_title=Monitoring butterflies in the Netherlands: how to get unbiased indices; citation_author=CAM Swaay, CL Plate, AJ Strien; citation_volume=13; citation_publication_date=2002; citation_pages=21-27; citation_id=CR18
citation_journal_title=Proc R Soc Lond B Biol Sci; citation_title=Shifts in phenology due to global climate change: the need for a yardstick; citation_author=ME Visser, C Both; citation_volume=272; citation_publication_date=2005; citation_pages=2561-2569; citation_doi=10.1098/rspb.2005.3356; citation_id=CR19