2011
Mollusc assemblages in palaeoecological reconstructions: an investigation of their predictive power using transfer function models
HORSÁK, MichalZákladní údaje
Originální název
Mollusc assemblages in palaeoecological reconstructions: an investigation of their predictive power using transfer function models
Autoři
HORSÁK, Michal (203 Česká republika, garant, domácí)
Vydání
Boreas, 2011, 0300-9483
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10600 1.6 Biological sciences
Stát vydavatele
Belgie
Utajení
není předmětem státního či obchodního tajemství
Impakt faktor
Impact factor: 1.910
Kód RIV
RIV/00216224:14310/11:00049471
Organizační jednotka
Přírodovědecká fakulta
UT WoS
000292106800005
Klíčová slova anglicky
Molluscs; spring fens; palaeo-reconstructions; transfer functions; environmental factors; predictions
Změněno: 7. 4. 2015 13:21, Mgr. Lucie Jarošová, DiS.
Anotace
V originále
Fossil mollusc assemblages are commonly used to reconstruct past environments, as their shells are abundant in various types of calcium-rich deposits. However, it is impossible to exactly evaluate estimates derived from fossil data using directly measured factors. To assess the accuracy of environmental variables derived from mollusc species composition, two modern data sets (training and test), each consisting of 73 samples of treeless fen communities, were constructed along with known local and climatic variables. The main predictors of species composition were isolated using canonical correspondence analysis and forward selection with the Monte Carlo permutation test. The accuracy of prediction for those factors that were significant in the forward selection was studied via four commonly used transfer function models. Three independent gradients of species composition driven by calcium content, moisture and temperature were detected. The best predictions were found for variables that correlated with the main changes in species composition. The strongest correlation between the predicted and measured values of the test data set was observed for water conductivity (r=0.86), a good proxy of calcium content. The locally weighted–weighted averaging transfer function model performed best out of all the models for the majority of variables tested. Mollusc assemblages were found to be useful for estimating local environmental variables based on a given species composition. Along with the specific advantages of mollusc fossil material, there is much potential for the use of their fossil assemblages to reconstruct palaeoenvironmental variables using transfer function models calibrated from recent compositional data and directly measured factors.
Návaznosti
| GAP504/11/0429, projekt VaV |
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| KJB601630803, projekt VaV |
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| MSM0021622416, záměr |
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