About the link between biodiversity and spectral variation

Aim The spectral variability hypothesis (SVH) suggests a link between spectral variation and plant biodiversity. The underlying assumptions are that higher spectral variation in canopy reflectance (depending on scale) is caused by either (1) variation in habitats or linked vegetation types or plant...

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Vydané v:Applied vegetation science Ročník 25; číslo 1
Hlavní autori: Fassnacht, Fabian Ewald, Müllerová, Jana, Conti, Luisa, Malavasi, Marco, Schmidtlein, Sebastian, Rocchini, Duccio
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Malden Wiley Subscription Services, Inc 01.01.2022
Predmet:
Biodiversity
Canopies
Community involvement
Flowers & plants
Herbivores
Hypotheses
leaf reflectance
Monitoring
Physiological effects
physiological state
Plant communities
Plant diversity
Plant species
Plants
Reflectance
Remote sensing
Seasonal variations
Species diversity
Spectra
spectral variability hypothesis
Variability
Variation
Vegetation
ISSN:1402-2001, 1654-109X
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Shrnutí:Aim The spectral variability hypothesis (SVH) suggests a link between spectral variation and plant biodiversity. The underlying assumptions are that higher spectral variation in canopy reflectance (depending on scale) is caused by either (1) variation in habitats or linked vegetation types or plant communities with their specific optical community traits or (2) variation in the species themselves and their specific optical traits. Methods The SVH was examined in several empirical remote‐sensing case studies, which often report some correlation between spectral variation and biodiversity‐related variables (mostly plant species counts); however, the strength of the observed correlations varies between studies. In contrast, studies focussing on understanding the causal relationship between (plant) species counts and spectral variation remain scarce. Here, we discuss these causal relationships and support our perspectives through simulations and experimental data. Results We reveal that in many situations the spectral variation caused by species or functional traits is subtle in comparison to other factors such as seasonality and physiological status. Moreover, the degree of contrast in reflectance has little to do with the number but rather with the identity of the species or communities involved. Hence, spectral variability should not be expressed based on contrast but rather based on metrics expressing manifoldness. While we describe cases where a certain link between spectral variation and plant species diversity can be expected, we believe that as a scientific hypothesis (which suggests a general validity of this assumed relationship) the SVH is flawed and requires refinement. Conclusions To this end we call for more research examining the drivers of spectral variation in vegetation canopies and their link to plant species diversity and biodiversity in general. Such research will allow critically assessing under which conditions spectral variation is a useful indicator for biodiversity monitoring and how it could be integrated into monitoring networks. The spectral variability hypothesis (SVH) suggests a link between spectral variation and (plant) species counts. Here, we reveal that in many situations this assumed link is weak, for example due to the influence of phenology or plant status on spectral variability. Further, we show that the chosen metric to calculate spectral variability also has a notable influence on the link.
Bibliografia:This article is a part of the Special Feature "Remote Sensing for Vegetation Science" edited by Duccio Rocchini, Hannes Feilhauer, Sebastian Schmidtlein and Jana Müllerová.
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ISSN:1402-2001
1654-109X
DOI:10.1111/avsc.12643